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| Titel |
Southern Hemisphere validation of GOSAT XCO2 and XCH4 from TCCON solar FTS measurements in Australia and New Zealand |
| VerfasserIn |
Vanessa Sherlock, John Robinson, Brian Connor, Hisako Shiona, Nicholas Deutscher, David Griffith, Ronald Macatangay, Isamu Morino, Osamu Uchino |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052658
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| Zusammenfassung |
| GOSAT carbon dioxide (CO2) and methane (CH4) retrieval errors need to be well
characterized if these data are to be used to constrain inverse model surface flux estimates.
Data from the Total Carbon Column Observing Network (TCCON) are the primary validation
data for GOSAT Short-Wavelength InfraRed (SWIR) retrievals. We describe the status of an
ongoing critical appraisal of measurements from the three Southern Hemisphere (SH)
TCCON sites, Darwin and Wollongong (Australia) and Lauder (New Zealand), in order to
generate a high quality, self consistent data set for GOSAT validation. Screened and
calibrated SH TCCON data are then compared with NIES GOSAT v01.xx SWIR nadir-view
retrievals of the total column and dry air mole fraction (XY ) of CO2 and CH4 in a 2Ã2 degree
area centred on each TCCON site. Preliminary results, albeit for limited sample
sizes, show biases ~2–3% for XCO2 and ~0.7% for XCH4 and random errors of
~1–2% (one sigma) for the GOSAT retrievals compared to TCCON data from
Darwin and Lauder. However, comparisons at Wollongong, where the number of
colocations (25) is largest, show larger biases (~7% for XCO2 and ~5% for XCH4)
and higher scatter (2%). Further analysis of colocated data in the vicinity of the
Wollongong site shows variations in GOSAT dry air total column retrievals account for
30–45% of the variance in GOSAT XY retrievals. The reasons for the GOSAT
retrieval error characteristics in the vicinity of Wollongong are explored in detail. |
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