 |
| Titel |
Validation of XCH4 derived from SWIR spectra of GOSAT TANSO-FTS with aircraft measurement data |
| VerfasserIn |
M. Inoue, I. Morino, O. Uchino, Y. Miyamoto, Y. Yoshida, T. Yokota, C. Sweeney, P. P. Tans, T. Machida |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250061220
|
|
|
|
|
|
| Zusammenfassung |
| Greenhouse gases Observing SATellite (GOSAT) was launched in January 2009 and has been
operationally observing atmospheric carbon dioxide (CO2) and methane (CH4) from space.
In this study, we have validated column-averaged volume mixing ratios of CH4 (XCH4)
derived from the Short-Wavelength InfraRed (SWIR) spectrum of Thermal And
Near-infrared Sensor for carbon Observation - Fourier Transform Spectrometer
(TANSO-FTS) onboard the GOSAT using aircraft data measured by the National Oceanic
and Atmospheric Administration (NOAA) and the National Institute for Environmental
Studies (NIES). In order to complete CH4 profiles and calculate XCH4, we extrapolate
profiles obtained by aircraft to the surface with the lowest aircraft measurement and utilize
the climatological CH4 density profiles obtained from Atmospheric Chemistry Experiment
(ACE) or Halogen Occultation Experiment (HALOE) as the stratospheric and mesospheric
profiles.
Because aircraft measurements within a few hours of the GOSAT overpass time were
limited, we prepared temporally interpolated aircraft-based XCH4 data by fitting with a curve
that contains annual trend and annual/semiannual sinusoidal variations to compare with the
GOSAT XCH4 within ±2 degrees or ±5 degrees latitude/longitude box centered
at each aircraft observation site. Comparison between GOSAT SWIR XCH4 and
aircraft-based XCH4 shows that there is a strong positive correlation of both XCH4
data in some observation sites. In addition, we will also present the GOSAT SWIR
column averaging kernel impact on the calculation of XCH4 derived under the aircraft
measurement. |
|
|
|
|
|
|