TY  - JOUR
A1  - Massart, Sébastien
A1  - Agustí-Panareda, Anna
A1  - Heymann, Jens
A1  - Buchwitz, Michael
A1  - Chevallier, Frédéric
A1  - Reuter, Maximilian
A1  - Hilker, Michael
A1  - Burrows, John P.
A1  - Deutscher, Nicholas M.
A1  - Feist, Dietrich G.
A1  - Hase, Frank
A1  - Sussmann, Ralf
A1  - Desmet, Filip
A1  - Dubey, Manvendra K.
A1  - Griffith, David W. T.
A1  - Kivi, Rigel
A1  - Petri, Christof
A1  - Schneider, Matthias
A1  - Velazco, Voltaire A.
T1  - Ability of the 4-D-Var analysis of the GOSAT BESD XCO2 retrievals to characterize atmospheric CO2 at large and synoptic scales
T2  - Atmospheric Chemistry and Physics
N2  - This study presents results from the European Centre for Medium-Range Weather Forecasts (ECMWF) carbon dioxide (CO2) analysis system where the atmospheric CO2 is controlled through the assimilation of column-averaged dry-air mole fractions of CO2 (XCO2) from the Greenhouse gases Observing Satellite (GOSAT). The analysis is compared to a free-run simulation (without assimilation of XCO2), and they are both evaluated against XCO2 data from the Total Carbon Column Observing Network (TCCON). We show that the assimilation of the GOSAT XCO2 product from the Bremen Optimal Estimation Differential Optical Absorption Spectroscopy (BESD) algorithm during the year 2013 provides XCO2 fields with an improved mean absolute error of 0.6 parts per million (ppm) and an improved station-to-station bias deviation of 0.7  ppm compared to the free run (1.1 and 1.4  ppm, respectively) and an improved estimated precision of 1  ppm compared to the GOSAT BESD data (3.3  ppm). We also show that the analysis has skill for synoptic situations in the vicinity of frontal systems, where the GOSAT retrievals are sparse due to cloud contamination. We finally computed the 10-day forecast from each analysis at 00:00  UTC, and we demonstrate that the CO2 forecast shows synoptic skill for the largest-scale weather patterns (of the order of 1000  km) even up to day 5 compared to its own analysis.
Y1  - 2016
UR  - https://opus.bibliothek.uni-augsburg.de/opus4/frontdoor/index/index/docId/120698
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:384-opus4-1206983
SN  - 1680-7324
VL  - 16
IS  - 3
SP  - 1653
EP  - 1671
PB  - Copernicus
CY  - Göttingen
ER  -