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The international at-sea intercomparison of f CO2 systems during the R/V Meteor Cruise 36/1 in the North Atlantic Ocean

Identifieur interne : 00BE63 ( Main/Exploration ); précédent : 00BE62; suivant : 00BE64

The international at-sea intercomparison of f CO2 systems during the R/V Meteor Cruise 36/1 in the North Atlantic Ocean

Auteurs : Arne Körtzinger [Allemagne] ; Ludger Mintrop [Allemagne] ; Douglas W. R Wallace [Allemagne] ; Kenneth M. Johnson [Allemagne] ; Craig Neill [États-Unis] ; Bronte Tilbrook [Australie] ; Philip Towler [Australie] ; Hisayuki Y. Inoue [Japon] ; Masao Ishii [Japon] ; Gary Shaffer [Danemark] ; Rodrigo F. Torres Saavedra [Suède] ; Eiji Ohtaki [Japon] ; Eiji Yamashita [Japon] ; Alain Poisson [France] ; Christian Brunet [France] ; Bernard Schauer [France] ; Catherine Goyet [États-Unis] ; Greg Eischeid [États-Unis]

Source :

RBID : ISTEX:A58B7B78B48094CBE7C9846C9745E00386229703

Descripteurs français

English descriptors

Abstract

Abstract: The ‘International Intercomparison Exercise of fCO2 Systems’ was carried out in 1996 during the R/V Meteor Cruise 36/1 from Bermuda/UK to Gran Canaria/Spain. Nine groups from six countries (Australia, Denmark, France, Germany, Japan, USA) participated in this exercise, bringing together 15 participants with seven underway fugacity of carbon dioxide (fCO2) systems, one discrete fCO2 system, and two underway pH systems, as well as systems for discrete measurement of total alkalinity and total dissolved inorganic carbon. Here, we compare surface seawater fCO2 measured synchronously by all participating instruments. A common infrastructure (seawater and calibration gas supply), different quality checks (performance of calibration procedures for CO2, temperature measurements) and a common procedure for calculation of final fCO2 were provided to reduce the largest possible amount of controllable sources of error. The results show that under such conditions underway measurements of the fCO2 in surface seawater and overlying air can be made to a high degree of agreement (±1 μatm) with a variety of possible equilibrator and system designs. Also, discrete fCO2 measurements can be made in good agreement (±3 μatm) with underway fCO2 data sets. However, even well-designed systems, which are operated without any obvious sign of malfunction, can show significant differences of the order of 10 μatm. Based on our results, no “best choice” for the type of the equilibrator nor specifics on its dimensions and flow rates of seawater and air can be made in regard to the achievable accuracy of the fCO2 system. Measurements of equilibrator temperature do not seem to be made with the required accuracy resulting in significant errors in fCO2 results. Calculation of fCO2 from high-quality total dissolved inorganic carbon (CT) and total alkalinity (AT) measurements does not yield results comparable in accuracy and precision to fCO2 measurements.

Url:
DOI: 10.1016/S0304-4203(00)00080-3


Affiliations:


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Le document en format XML

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<term>Abest choiceb</term>
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<term>Calibration procedures</term>
<term>Canary Islands</term>
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<term>Carbon dioxide information analysis center</term>
<term>Carbonic</term>
<term>Carbonic acid</term>
<term>Cell temperature</term>
<term>Chem</term>
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<term>Common procedure</term>
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<term>Data sets</term>
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<term>Different ways</term>
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<term>Individual deviations range</term>
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<term>Marine research</term>
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<term>Reference probe</term>
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<term>Sample volume</term>
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<term>Seawater fco2 measurements</term>
<term>Seawater intake</term>
<term>Seawater temperature</term>
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<term>Significant loss</term>
<term>Smaller deviations</term>
<term>Standard deviation</term>
<term>Standard gases</term>
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<term>Superior method</term>
<term>Superior reference method</term>
<term>Supply line</term>
<term>Surface seawater</term>
<term>Surface temperature</term>
<term>System designs</term>
<term>Takahashi</term>
<term>Technical circumstances</term>
<term>Technical failure</term>
<term>Temperature correction</term>
<term>Temperature dependence</term>
<term>Temperature deviation</term>
<term>Temperature measurements</term>
<term>Temperature probes</term>
<term>Temperature reading</term>
<term>Temperature readings</term>
<term>Temperature sensors</term>
<term>Tertiary standards</term>
<term>Time shifts</term>
<term>Total alkalinity</term>
<term>Water bath</term>
<term>Water vapor</term>
<term>Weiss</term>
<term>Woods hole</term>
<term>World ocean</term>
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<term>alkalinity</term>
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<term>Alcalinité</term>
<term>Cycle carbone</term>
<term>Dioxyde carbone</term>
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<term>Etalonnage</term>
<term>Fugacité</term>
<term>Hydrochimie</term>
<term>Iles Bermudes</term>
<term>Iles Canaries</term>
<term>Interface air mer</term>
<term>Océan Atlantique Nord</term>
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<term>Pression partielle</term>
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<keywords scheme="Teeft" xml:lang="en">
<term>Abest choiceb</term>
<term>Achievable accuracy</term>
<term>Amoon poolb</term>
<term>Analytical problem</term>
<term>Analytical systems</term>
<term>Analyzer</term>
<term>Andrew dickson</term>
<term>Atmospheric pressure</term>
<term>Aunknown samplesb</term>
<term>Bottom panel</term>
<term>Calculation procedures</term>
<term>Calibration</term>
<term>Calibration gases</term>
<term>Calibration performance</term>
<term>Calibration procedures</term>
<term>Carbon dioxide</term>
<term>Carbon dioxide information analysis center</term>
<term>Carbonic</term>
<term>Carbonic acid</term>
<term>Cell temperature</term>
<term>Chem</term>
<term>Common infrastructure</term>
<term>Common procedure</term>
<term>Continuous flow</term>
<term>Controllable sources</term>
<term>Cruise</term>
<term>Cruise track</term>
<term>Daily basis</term>
<term>Data points</term>
<term>Data sets</term>
<term>Deviation</term>
<term>Different equations</term>
<term>Different ways</term>
<term>Dioxide</term>
<term>Discrete samples</term>
<term>Dissociation constants</term>
<term>Elsevier science</term>
<term>Equilibration</term>
<term>Equilibration temperature</term>
<term>Equilibrator</term>
<term>Equilibrator probe</term>
<term>Equilibrator temperature</term>
<term>Equilibrator temperature sensors</term>
<term>Factory calibration</term>
<term>Fco2</term>
<term>Flow rate</term>
<term>Flow rates</term>
<term>Fugacity</term>
<term>General design</term>
<term>Good agreement</term>
<term>Goyet</term>
<term>Gran canariarspain</term>
<term>High degree</term>
<term>Important issue</term>
<term>Individual deviations</term>
<term>Individual deviations range</term>
<term>Infrared analyzer</term>
<term>Inorganic carbon</term>
<term>Input parameters</term>
<term>Intercomparison</term>
<term>Intercomparison exercise</term>
<term>International intercomparison exercise</term>
<term>June</term>
<term>Kortzinger</term>
<term>Larger scatter</term>
<term>Main features</term>
<term>Main results</term>
<term>Marine chemistry</term>
<term>Marine research</term>
<term>Matm</term>
<term>Meteor</term>
<term>Meteor cruise</term>
<term>Middle panel</term>
<term>Millero</term>
<term>Miny1</term>
<term>Miny1 kmy1</term>
<term>Mole fraction</term>
<term>Ndir</term>
<term>Ndir instruments</term>
<term>Ndir measurement</term>
<term>Nominal concentration range</term>
<term>Obvious sign</term>
<term>Optical cell</term>
<term>Overall time</term>
<term>Overall uncertainty</term>
<term>Partial pressure</term>
<term>Particular system</term>
<term>Possible equilibrator</term>
<term>Potential sources</term>
<term>Ppmv</term>
<term>Range matm</term>
<term>Reference probe</term>
<term>Reference thermometer</term>
<term>Refitted mehrbach constants</term>
<term>Salinity</term>
<term>Sample volume</term>
<term>Sampling network</term>
<term>Saturation water vapor pressure</term>
<term>Scripps institution</term>
<term>Seawater</term>
<term>Seawater fco2 measurements</term>
<term>Seawater intake</term>
<term>Seawater temperature</term>
<term>Short periods</term>
<term>Significant loss</term>
<term>Smaller deviations</term>
<term>Standard deviation</term>
<term>Standard gases</term>
<term>Strong gradients</term>
<term>Superior method</term>
<term>Superior reference method</term>
<term>Supply line</term>
<term>Surface seawater</term>
<term>Surface temperature</term>
<term>System designs</term>
<term>Takahashi</term>
<term>Technical circumstances</term>
<term>Technical failure</term>
<term>Temperature correction</term>
<term>Temperature dependence</term>
<term>Temperature deviation</term>
<term>Temperature measurements</term>
<term>Temperature probes</term>
<term>Temperature reading</term>
<term>Temperature readings</term>
<term>Temperature sensors</term>
<term>Tertiary standards</term>
<term>Time shifts</term>
<term>Total alkalinity</term>
<term>Water bath</term>
<term>Water vapor</term>
<term>Weiss</term>
<term>Woods hole</term>
<term>World ocean</term>
</keywords>
</textClass>
<langUsage>
<language ident="en">en</language>
</langUsage>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">Abstract: The ‘International Intercomparison Exercise of fCO2 Systems’ was carried out in 1996 during the R/V Meteor Cruise 36/1 from Bermuda/UK to Gran Canaria/Spain. Nine groups from six countries (Australia, Denmark, France, Germany, Japan, USA) participated in this exercise, bringing together 15 participants with seven underway fugacity of carbon dioxide (fCO2) systems, one discrete fCO2 system, and two underway pH systems, as well as systems for discrete measurement of total alkalinity and total dissolved inorganic carbon. Here, we compare surface seawater fCO2 measured synchronously by all participating instruments. A common infrastructure (seawater and calibration gas supply), different quality checks (performance of calibration procedures for CO2, temperature measurements) and a common procedure for calculation of final fCO2 were provided to reduce the largest possible amount of controllable sources of error. The results show that under such conditions underway measurements of the fCO2 in surface seawater and overlying air can be made to a high degree of agreement (±1 μatm) with a variety of possible equilibrator and system designs. Also, discrete fCO2 measurements can be made in good agreement (±3 μatm) with underway fCO2 data sets. However, even well-designed systems, which are operated without any obvious sign of malfunction, can show significant differences of the order of 10 μatm. Based on our results, no “best choice” for the type of the equilibrator nor specifics on its dimensions and flow rates of seawater and air can be made in regard to the achievable accuracy of the fCO2 system. Measurements of equilibrator temperature do not seem to be made with the required accuracy resulting in significant errors in fCO2 results. Calculation of fCO2 from high-quality total dissolved inorganic carbon (CT) and total alkalinity (AT) measurements does not yield results comparable in accuracy and precision to fCO2 measurements.</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>Allemagne</li>
<li>Australie</li>
<li>Danemark</li>
<li>France</li>
<li>Japon</li>
<li>Suède</li>
<li>États-Unis</li>
</country>
<region>
<li>Götaland</li>
<li>Hovedstaden</li>
<li>Massachusetts</li>
<li>Schleswig-Holstein</li>
<li>Suède occidentale</li>
<li>État de New York</li>
<li>Île-de-France</li>
</region>
<settlement>
<li>Copenhague</li>
<li>Göteborg</li>
<li>Kiel</li>
<li>Paris</li>
</settlement>
<orgName>
<li>Université Pierre-et-Marie-Curie</li>
<li>Université de Göteborg</li>
</orgName>
</list>
<tree>
<country name="Allemagne">
<noRegion>
<name sortKey="Kortzinger, Arne" sort="Kortzinger, Arne" uniqKey="Kortzinger A" first="Arne" last="Körtzinger">Arne Körtzinger</name>
</noRegion>
<name sortKey="Johnson, Kenneth M" sort="Johnson, Kenneth M" uniqKey="Johnson K" first="Kenneth M" last="Johnson">Kenneth M. Johnson</name>
<name sortKey="Kortzinger, Arne" sort="Kortzinger, Arne" uniqKey="Kortzinger A" first="Arne" last="Körtzinger">Arne Körtzinger</name>
<name sortKey="Mintrop, Ludger" sort="Mintrop, Ludger" uniqKey="Mintrop L" first="Ludger" last="Mintrop">Ludger Mintrop</name>
<name sortKey="Wallace, Douglas W R" sort="Wallace, Douglas W R" uniqKey="Wallace D" first="Douglas W. R" last="Wallace">Douglas W. R Wallace</name>
</country>
<country name="États-Unis">
<region name="État de New York">
<name sortKey="Neill, Craig" sort="Neill, Craig" uniqKey="Neill C" first="Craig" last="Neill">Craig Neill</name>
</region>
<name sortKey="Eischeid, Greg" sort="Eischeid, Greg" uniqKey="Eischeid G" first="Greg" last="Eischeid">Greg Eischeid</name>
<name sortKey="Goyet, Catherine" sort="Goyet, Catherine" uniqKey="Goyet C" first="Catherine" last="Goyet">Catherine Goyet</name>
</country>
<country name="Australie">
<noRegion>
<name sortKey="Tilbrook, Bronte" sort="Tilbrook, Bronte" uniqKey="Tilbrook B" first="Bronte" last="Tilbrook">Bronte Tilbrook</name>
</noRegion>
<name sortKey="Towler, Philip" sort="Towler, Philip" uniqKey="Towler P" first="Philip" last="Towler">Philip Towler</name>
</country>
<country name="Japon">
<noRegion>
<name sortKey="Inoue, Hisayuki Y" sort="Inoue, Hisayuki Y" uniqKey="Inoue H" first="Hisayuki Y" last="Inoue">Hisayuki Y. Inoue</name>
</noRegion>
<name sortKey="Ishii, Masao" sort="Ishii, Masao" uniqKey="Ishii M" first="Masao" last="Ishii">Masao Ishii</name>
<name sortKey="Ohtaki, Eiji" sort="Ohtaki, Eiji" uniqKey="Ohtaki E" first="Eiji" last="Ohtaki">Eiji Ohtaki</name>
<name sortKey="Yamashita, Eiji" sort="Yamashita, Eiji" uniqKey="Yamashita E" first="Eiji" last="Yamashita">Eiji Yamashita</name>
</country>
<country name="Danemark">
<region name="Hovedstaden">
<name sortKey="Shaffer, Gary" sort="Shaffer, Gary" uniqKey="Shaffer G" first="Gary" last="Shaffer">Gary Shaffer</name>
</region>
</country>
<country name="Suède">
<region name="Götaland">
<name sortKey="Torres Saavedra, Rodrigo F" sort="Torres Saavedra, Rodrigo F" uniqKey="Torres Saavedra R" first="Rodrigo F" last="Torres Saavedra">Rodrigo F. Torres Saavedra</name>
</region>
</country>
<country name="France">
<region name="Île-de-France">
<name sortKey="Poisson, Alain" sort="Poisson, Alain" uniqKey="Poisson A" first="Alain" last="Poisson">Alain Poisson</name>
</region>
<name sortKey="Brunet, Christian" sort="Brunet, Christian" uniqKey="Brunet C" first="Christian" last="Brunet">Christian Brunet</name>
<name sortKey="Schauer, Bernard" sort="Schauer, Bernard" uniqKey="Schauer B" first="Bernard" last="Schauer">Bernard Schauer</name>
</country>
</tree>
</affiliations>
</record>

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