Addressing GHG Validation in GHG

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Presentation transcript:

Addressing GHG Validation in GHG Albrecht von Bargen DLR Agenda Item # 99 WGCV Plenary # 42 Canberra May 16 - 19, 2017

Presentation is not a complete survey but a starting point Adressing GHG Validation WGCV Plenary # 44 Presentation is not a complete survey but a starting point Introduction of state-of-the-art network: TCCON How to integrate in WGCV discussion related to GHG Additional means / campaigns / activities to be taken into account COCON (KIT) EM-27 COMET-1 campaign (-> presentation on Thursday)

The Total Carbon Column Observing Network (TCCON) – cal/val reference for all GHG satellite missions Dietrich Feist TCCON Deputy Chair Europe & Africa Max Planck Institute for Biogeochemistry Jena, Germany 2018-06-18 CEOS GHG workshop, JRC

Remote sensing: column-averaged GHG observations http://oco.jpl.nasa.gov/ GOSAT/Japan: since 2009 OCO-2/USA: since 2014 Covers full atmospheric column from ground to ~100 km Measure total column of CO2/CH4 and use total column of O2 as proxy for airmass (assuming constant mole fraction of 0.2095) Observed parameter is colum-averaged dry-air mole fraction => XCO2/XCH4 Division of columns minimizes broad-band spectral biases (e.g. from aerosols) 2018-06-18 CEOS GHG workshop, JRC

Total Carbon Column Observing Network (TCCON) Network of ground based FTIR stations Different groups, common standards High-precision column observations of CO2, CH4, CO, N2O. Crucial reference for satelllite GHG measurements 2018-06-18 CEOS GHG workshop, JRC

Column-averaged XCO2 and in-situ CO2 are hard to compare 2018-06-18 CEOS GHG workshop, JRC

TCCON global coverage Correlation with adjacent grid cells From: Belikov et al., ACP, 2017 Correlation with adjacent grid cells 2018-06-18 CEOS GHG workshop, JRC

TCCON European coverage From: Belikov et al., ACP, 2017 Correlation with adjacent grid cells 2018-06-18 CEOS GHG workshop, JRC

TCCON XCO2 is calibrated to WMO CO2 in-situ scale TCCON stations are calibrated vs aircraft in- situ profiles Calibration provides network-wide scaling factor from spectroscopic scale to WMO in-situ scale Very consistent over many years and different continents TCCON provides link between in-situ networks and satellites 2018-06-18 CEOS GHG workshop, JRC

TCCON & ICOS TCCON is currently not associated with ICOS. Discussions to include (some) European TCCON stations in ICOS have been going on for some time. Official negotiations starting in Oct 2018. Station operation in ICOS would have to be funded nationally. Issue: 8 out of 11 European TCCON stations are run by German groups. 2018-06-18 CEOS GHG workshop, JRC

Conclusions TCCON is the cal/val reference for all current satellite GHG missions. This reference cannot be provided by ground-based in situ observations readily. Important regions like Africa and South America are currently not covered. Very few TCCON stations have stable long-term funding. All future satellite GHG missions at least plan to use TCCON data. 2018-06-18 CEOS GHG workshop, JRC