{"id":11901,"date":"2024-02-15T21:22:22","date_gmt":"2024-02-15T20:22:22","guid":{"rendered":"https:\/\/www.swissfluxnet.ethz.ch\/?page_id=11901"},"modified":"2024-02-15T21:22:23","modified_gmt":"2024-02-15T20:22:23","slug":"wrong-calibration-gas-2017","status":"publish","type":"page","link":"https:\/\/swissfluxnet.ethz.ch\/index.php\/documentation\/wrong-calibration-gas-2017\/","title":{"rendered":"Wrong Calibration Gas 2017"},"content":{"rendered":"<ul>\n<li>This issue is known since March 2019, which was too late for some of the FLUXNET uploads we did at the same time. Affects fluxes by approx. 3%.<\/li>\n<li>This issue can be corrected with the script <a href=\"https:\/\/gitlab.ethz.ch\/holukas\/cdc-calibration-gain-correction\" target=\"_blank\" rel=\"noopener noreferrer\">CGC Calibration Gain Correction<\/a>, available on GitLab, or directly with <a href=\"https:\/\/gitlab.ethz.ch\/holukas\/fct-flux-calculation-tool\" target=\"_blank\" rel=\"noopener noreferrer\">FCT v0.9.5+<\/a>.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2>CO2 standards measured by UniBe were off<\/h2>\n<p>by PM<\/p>\n<h3>The Problem<\/h3>\n<p>CO2 standards, measured at 15.07.2016 were off by 10-15 ppm. We measured the flasks at EMPA (CZ) on 07\/03\/2019 and found roughly 14 ppm difference (see below). After knowing this, I confronted ML and he immediately found the problem: the calibration was done using a cubic calibration function (UniBe1) instead of a linear one (UniBe2). This resulted in approx 12 ppm difference. Considering the &#8220;wrong&#8221; air matrix of the synthetic air (only 20% O2, no Ar), the EMPA measurements are roughly 1 ppm underestimated. This leads to a difference of approx 1.5 ppm between EMPA and UniBe2.<\/p>\n<p>&nbsp;<\/p>\n<h3>Conclusions<\/h3>\n<ul>\n<li>UniBe2 are the correct concentrations<\/li>\n<li>we calibrated with the wrong concentrations (UniBe1) at the dates in the table below<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Erroneous flasks<\/h3>\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">EMPA<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">UniBe1<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Diff<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Factor<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">UniBe2<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Factor<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block md-focus-container\">\n<td><span class=\"td-span md-focus\"><span class=\"md-plain md-expand\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">447.19<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">461.195<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">14.005<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">1.0313<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">449.064<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">0.974<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">10754002<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">447.54<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">461.791<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">14.251<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">1.0318<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">449.607<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">0.974<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">10692738<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">444.83<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">458.434<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">13.604<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">1.0306<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">446.597<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">0.974<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>Calibrations with the wrong standards<\/h3>\n<h4>&nbsp;<\/h4>\n<h4>CH-AWS<\/h4>\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">Date<\/span><\/span><\/strong><\/td>\n<th><span class=\"td-span\"><span class=\"md-plain\">Instr<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">SN<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Meas<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Comment<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">12 Oct 2017<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0585<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td><span class=\"td-span md-focus\"><span class=\"md-plain md-expand\">&nbsp;<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">19 Oct 2018<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0585<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td><span class=\"td-span md-focus\"><span class=\"md-plain md-expand\">&nbsp;<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">21 Nov 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0585<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span md-focus\"><span class=\"md-plain md-expand\">removed device from site<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Affected time period: all IRGA72 CO2 concentrations between <code>2017101207.A00<\/code> and <code>2019112107.A00<\/code>.<\/li>\n<li>Affected time periods are also shown in <a href=\"https:\/\/www.swissfluxnet.ethz.ch\/index.php\/sites\/ch-aws-alp-weissenstein\/data-ch-aws\/ec-raw-binary-format-ch-aws\/\">EC Raw Binary Format (CH-AWS)<\/a>.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h4>CH-CHA<\/h4>\n<table class=\"md-table\">\n<tbody>\n<tr class=\"md-end-block\">\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">Date<\/span><\/span><\/strong><\/td>\n<th><span class=\"td-span\"><span class=\"md-plain\">Instr<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">SN<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Meas<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Comment<\/span><\/span><\/th>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">11 Jan 2017<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0639<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\"><del>probably<\/del> 10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">calibration file <del>missing<\/del> found<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">15 Mar 2017<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">replacement instrument from CH-OE2, was calibrated before with correct calibration gas<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">14 Apr 2017<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">again change of analyzer, was calibrated before with correct calibration gas<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">30 Apr 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0639<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">calibrated with correct calibration gas<\/span><\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Affected time period: all IRGA75 CO2 concentrations between <code>2017011114.C57<\/code> and <code>2017031507.C00<\/code>.<\/li>\n<li>Due to the replacement of in 15 Mar 2017, only a short time period of approx. 2 months is affected by the wrong calibration gas.<\/li>\n<li>Affected time periods are also shown in <a href=\"https:\/\/www.swissfluxnet.ethz.ch\/index.php\/sites\/ch-cha-chamau\/data-ch-cha\/ec-raw-binary-format-ch-cha\/\" target=\"_blank\" rel=\"noopener noreferrer\">EC Raw Binary Format (CH-CHA)<\/a>.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h4>CH-DAV<\/h4>\n<table class=\"md-table\">\n<tbody>\n<tr class=\"md-end-block\">\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">Date<\/span><\/span><\/strong><\/td>\n<th><span class=\"td-span\"><span class=\"md-plain\">Instr<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">SN<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Meas<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Comment<\/span><\/span><\/th>\n<\/tr>\n<tr class=\"md-end-block md-focus-container\">\n<td><span class=\"td-span\"><span class=\"md-plain\">08 Mar 2018<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H0215<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td><span class=\"td-span md-focus\"><span class=\"md-plain md-expand\">reference only<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">20 Apr 2018<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H0215&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><strong><span class=\"td-span md-focus\"><span class=\"md-plain md-expand\">calibrated with correct calibration gas (factory calibration)<\/span><\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>The LI-7200 used for EC at CH-DAV was not affected by the wrong calibration gas.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<table class=\"md-table\">\n<tbody>\n<tr class=\"md-end-block\">\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">Date<\/span><\/span><\/strong><\/td>\n<th><span class=\"td-span\"><span class=\"md-plain\">Instr<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">SN<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Meas<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Comment<\/span><\/span><\/th>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">07 Jun 2018<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-840<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">HGA-2016<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Storage<\/span><\/span><\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">12 Feb 2019<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-840<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">HGA-0238<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Storage<\/span><\/span><\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">15 Feb 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-840<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">HGA-2016<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Storage<br \/>\n<\/span><\/span><\/td>\n<td>device removed from site<\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">27 Feb 2019<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-840<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">HGA-2016<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Storage<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">reference only<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">29 Mar 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-840<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">HGA-0283<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Storage<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">device removed from site<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h4>CH-FRU<\/h4>\n<table class=\"md-table\">\n<tbody>\n<tr>\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">Date<\/span><\/span><\/strong><\/td>\n<th><span class=\"td-span\"><span class=\"md-plain\">Instrument<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Serial<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Measurement<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Comment<\/span><\/span><\/th>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">30 Nov 2016<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0874<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\"><del>probably<\/del> 10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">calibration file <del>missing<\/del> found<del><br \/>\n<\/del><\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">16 Jun 2017<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0874<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">device removed from site<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">16 Jun 2017<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0335<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">interim replacement<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">26 Jul 2017<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0335<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">device removed from site<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">27 Jul 2017<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0849<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">11 Dec 2018<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0849<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">28 Nov 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0849<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><strong>calibrated with correct calibration gas<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Affected time period: all IRGA75 CO2 concentrations between <code>2016113012.b47<\/code> and <code>2019112707.X00<\/code>.<\/li>\n<li><del>From the notes, it was not clear if 2016 and 2017 were affected.<\/del><\/li>\n<li>Affected time periods are also shown in <a href=\"https:\/\/www.swissfluxnet.ethz.ch\/index.php\/sites\/ch-fru-fruebuel\/data-ch-fru\/ec-raw-binary-format\/\" target=\"_blank\" rel=\"noopener noreferrer\">EC Raw Binary Format (CH-FRU)<\/a>.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h4>CH-LAE<\/h4>\n<table class=\"md-table\">\n<tbody>\n<tr>\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">Date<\/span><\/span><\/strong><\/td>\n<th><span class=\"td-span\"><span class=\"md-plain\">Instrument<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Serial<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Measurement<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Comment<\/span><\/span><\/th>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">14 Dec 2017<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0577<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">10 Jan 2019<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0586<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">11 Jan 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0577<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">removed device from site<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">11 Jan 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0586<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">installed at site<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">15 Mar 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0586<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">calibrated with correct calibration gas<\/span><\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">14 Dec 2017<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7000<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">IRG4-0987<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Profile<\/span><\/span><\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">05 Feb 2019<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7000<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">IRG4-0987<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Profile<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">reference only<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">13 Feb 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7000<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">IRG4-0987<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Profile<\/span><\/span><\/td>\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">calibrated with correct calibration gas<\/span><\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Affected time period: all IRGA72 CO2 concentrations between <code>2017121417.L22<\/code> and <code>2019031523.L20<\/code>.<\/li>\n<li>Affected time periods are also shown in <a href=\"https:\/\/www.swissfluxnet.ethz.ch\/index.php\/sites\/ch-lae-laegeren\/data-ch-lae\/ec-raw-binary-format-ch-lae\/\" target=\"_blank\" rel=\"noopener noreferrer\">EC Raw Binary Format (CH-LAE)<\/a>.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h4>CH-INO<\/h4>\n<table class=\"md-table\">\n<tbody>\n<tr>\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">Date<\/span><\/span><\/strong><\/td>\n<th><span class=\"td-span\"><span class=\"md-plain\">Instrument<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Serial<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Measurement<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Comment<\/span><\/span><\/th>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">13 Sep 2017<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0586<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td>removed device from site<\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">03 Oct 2018<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0640<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">InnoFarm project<br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">14 Nov 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7500<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">75H-0640<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">InnoFarm, <strong>calibrated with correct calibration gas<\/strong><br \/>\n<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h4>CH-OE2<\/h4>\n<table class=\"md-table\">\n<tbody>\n<tr>\n<td><strong><span class=\"td-span\"><span class=\"md-plain\">Date<\/span><\/span><\/strong><\/td>\n<th><span class=\"td-span\"><span class=\"md-plain\">Instrument<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Serial<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Flask<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Measurement<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">Comment<\/span><\/span><\/th>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">28 Sep 2018<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0834(?)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">03 Oct 2018<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0834<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10748329<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<\/span><\/span><\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td><span class=\"td-span\"><span class=\"md-plain\">14 Nov 2019<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">LI-7200<br \/>\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">72H-0834<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&nbsp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">EC<br \/>\n<\/span><\/span><\/td>\n<td><strong>calibrated with correct calibration gas<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Affected time period: all IRGA72 CO2 concentrations between <code>2018100419.o00<\/code> and <code>2019111313.o00<\/code>.<\/li>\n<li>Affected time periods are also shown in <a href=\"https:\/\/www.swissfluxnet.ethz.ch\/index.php\/sites\/ch-oe2-oensingen\/data-ch-oe2\/ec-raw-binary-format-ch-oe2\/\">EC Raw Binary Format (CH-OE2)<\/a>.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Downloads<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.swissfluxnet.ethz.ch\/wp-content\/uploads\/2019\/11\/Calibration_Gas_Issue_2017-2019_20191114.zip\">Original info file by PM (.md as .zip)<\/a><\/li>\n<li><a href=\"https:\/\/www.swissfluxnet.ethz.ch\/wp-content\/uploads\/2019\/11\/calibration_gas_issue_20200414.zip\">Updated info file by PM (.md as .zip)<\/a> 14 Apr 2020<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This issue is known since March 2019, which was too late for some of the FLUXNET uploads we did at the same time. Affects fluxes by approx. 3%. This issue can be corrected with the script CGC Calibration Gain Correction, available on GitLab, or directly with FCT v0.9.5+. &nbsp; CO2 . . . <a class=\"readmore-link\" href=\"https:\/\/swissfluxnet.ethz.ch\/index.php\/documentation\/wrong-calibration-gas-2017\/\">Read more<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"parent":11817,"menu_order":13,"comment_status":"closed","ping_status":"closed","template":"template-full-width.php","meta":{"_acf_changed":false,"_lmt_disableupdate":"","_lmt_disable":"","ngg_post_thumbnail":0,"footnotes":""},"coauthors":[314],"class_list":["post-11901","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/pages\/11901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/comments?post=11901"}],"version-history":[{"count":1,"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/pages\/11901\/revisions"}],"predecessor-version":[{"id":11902,"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/pages\/11901\/revisions\/11902"}],"up":[{"embeddable":true,"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/pages\/11817"}],"wp:attachment":[{"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/media?parent=11901"}],"wp:term":[{"taxonomy":"author","embeddable":true,"href":"https:\/\/swissfluxnet.ethz.ch\/index.php\/wp-json\/wp\/v2\/coauthors?post=11901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}