IC2020 - Exercise

Here you find information about several topis (last update 23. August 2021):

- Setup
- Instruments
- pCO2 and temperature range
- Daily meetings
- Data handling
- Reference gases
- Water supply
- Social media/dissemination


The tank has a volume of approximately 5 m3, which allows for relative quick temperature and pCO2 changes. The tank will be insulated so that warming/cooling will be minimized once the water reaches the desired temperature. The pCO2 will be adjusted by adding acid or base. We will constantly monitor the carbonate system by taking discrete samples for DIC and alkalinity to assure realistic conditions. The tank will be equipped with:

  • 3 temperature sensors (Seabird SBE38). One next to the pump intake, the other two distributed in the tank to monitor the temperature distribution in the tank
  • A thermosalinograph to monitor salinity.
  • The main distribution pump (see below water supply) will sit on the bottom of the tank in the middle. The submersible sensors will be arranged around the pump.

The following instruments and PI's are participating in this exercise. We give only one contact per instrument, but of course there are more people involved.

Instrument Manufacturer/provider contact email
ASVCO2 NOAA/PMEL (USA) Noah Slavas Lawrence noah.lawrence-slavas@noaa.gov
MApCO2 Sensors Systems & Solutions (USA) Jac Fought jacfought@sensorssystemssolutions.com
Vegas Hagan Technologies (South Africa)/GEOMAR (Germany) Clinton Hagan clinton@hagantechnologies.co.za
Vegas Hagan Technologies (South Africa)/GEOMAR (Germany) Clinton Hagan clinton@hagantechnologies.co.za
Carioca CNRS (France) Laurence Beaumont laurence.beaumont@cnrs.fr
Contros HydroC CO2 4H-Jena (Germany) Jack Triest triest@4h-jena.de
Contros HydroC CO2 4H-Jena (Germany)/FMI (Finland) Martti Honkanen Martti.Honkanen@fmi.fi
Contros HydroC CO2 4H-Jena (Germany)/CNR-ISMAR (Italy) Carolina Cantoni carolina.cantoni@ts.ismar.cnr.it
custom  Tokyo University (Japan) Kiminori Shitashima kshita0@kaiyodai.ac.jp
NKE NKE (France) Damien Malarde dmalarde@nke.fr
Pro Oceanus CO2-Pro ATM Pro Oceanus (Canada)/HCMR (Greece) Constantin Frangoulis cfrangoulis@hcmr.gr
Pro Oceanus CO2-Pro ATM Pro Oceanus (Canada) Mark Barry mark@pro-oceanus.com
Pro Oceanus Pro-CV Pro Oceanus (Canada) Mark Barry mark@pro-oceanus.com
SAMI CO2 Sunburst (USA)/FMI (Finland) Martti Honkanen Martti.Honkanen@fmi.fi
SAMI CO2 Sunburst (USA)/University of Uppsala (Sweden) Anna Rutgersson Anna.Rutgersson@met.uu.se
AFT Sunburst (USA) Reggie Spaulding reggie@sunburstsensors.com
Contros HydroC CO2 FT 4H-Jena (Germany) Jack Triest triest@4h-jena.de
Contros HydroC CO2 FT 4H-Jena (Germany)/Hereon (Germany) Vlad Macovei Vlad.Macovei@hereon.de
Contros HydroC CO2 FT 4H-Jena (Germany)/VLIZ (Belgium) Thanos Gkritzalis thanosg@vliz.be
CAPASSOS (prototype) University of Exeter (UK) Witek Tatkiewicz W.Tatkiewicz@exeter.ac.uk
custom Xiamen UNiversity (China) Quanlong Li liql@xmu.edu.cn
custom VLIZ (Belgium) Thanos Gkritzalis thanosg@vliz.be
GO General Oceanics (USA)/CSIRO (Australia) Craig Neill Craig.Neill@csiro.au
GO General Oceanics (USA)/CSIRO (Australia) Craig Neill Craig.Neill@csiro.au
Dalhousie-PO Dalhaousie UNiversity (Canada) Dariia Atamanchuk dariia.atamanchuk@Dal.Ca
SUPER CO2 Sunburst (USA)/FMI (Finland) Martti Honkanen Martti.Honkanen@fmi.fi
SubCtech Cube SubCtech (Germany) Jana Fahning fahning@subctech.com
SubCtech Cube SubCtech (Germany)/MIP Hamburg (Germany) Peter Landschützer peter.landschuetzer@mpimet.mpg.de
SubCtech race SubCtech (Germany)/The Ocean Race (Spain) Simon Weppe simon.weppe@ext.theoceanrace.com
pCO2 and temperature range
  • pCO2 range: 200 - 800 µatm
  • Temperature range: 5 - 30°C
Data handling

We will provide the following data in real time on a cloud folder for all paticipants:

  • Water temperature in the tank
  • Salinity in the tank
  • Air pressure
  • Room temperature

We plan to process the instruments' data using the Quince software developed by the ICOS OTC. During the exercise the data will be collected from all instruments and prepared for the daily data meeting (see below). We ask all groups to do the data reduction also by themselves, so that we can compare the different data reduction routines.

Daily meetings: 13:00 UTC

We will have daily data meetings which will be held online at 13:00 UTC.  After a presentation of the data from the last 24 hours we will discuss the next steps (improvements to instruments, next pCO2 level, next temperature step,...) with all participants. The link to the meetings will be provided to all interested scientists.

Reference gases

Reference gases will be provided by the ICOS flask and calibration lab in Jena, Germany. We will provide two sets of reference gases with the following CO2 concentrations:

1st set (all values in ppm CO2) spare set (all values in ppm CO2)

zero gas

zero gas
147.63 147.23
298.13 298.06
423.91 423.91
503.86 504.32
814.18 813.27


We will build a gas distribution system to the instruments based on the information we received from the groups. Not all groups might be able to use all gases all the time. There is the possibility to switch reference gases based on the measured pCO2 range.

Water supply

A submersible pump will be installed in the middle of the tank and supply all flow-through systems with water. The submersible instruments will be installed around the pump. The drain water will be redirected to the tank.


Short news articles will be published by IOCPP and ICOS, but everyone is welcome to write about the exercise. We will provide pictures during the exercise in a cloud folder, that can be used for your information and for distribution.

In fall 2021 we plan to have a two or three-day event discussing the first results of the inter-comparison and the science around it. The format is not yet decided and can be discussed during the exercise in summer.

Twitter: Everyone is welcome to tweet about the inter-comparison. We decided to use the hashtag #pco2compare. Please use it for any twitter activities around the inter-comparison.