 |
| Titel |
Radiometric consistency assessment of hyperspectral infrared sounders |
| VerfasserIn |
L. Wang, Y. Han, X. Jin, Y. Chen, D. A. Tremblay |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 11 ; Nr. 8, no. 11 (2015-11-19), S.4831-4844 |
| Datensatznummer |
250116687
|
| Publikation (Nr.) |
 copernicus.org/amt-8-4831-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| The radiometric and spectral consistency among the Atmospheric Infrared
Sounder (AIRS), the Infrared Atmospheric Sounding Interferometer (IASI), and
the Cross-track Infrared Sounder (CrIS) is fundamental for the creation of
long-term infrared (IR) hyperspectral radiance benchmark data sets for both
intercalibration and climate-related studies. In this study, the CrIS
radiance measurements on Suomi National Polar-orbiting Partnership (SNPP)
satellite are directly compared with IASI on MetOp-A and MetOp-B at the finest spectral
scale and with AIRS on Aqua in 25 selected spectral regions through simultaneous
nadir overpass (SNO) observations in 2013, to evaluate radiometric
consistency of these four hyperspectral IR sounders. The spectra from
different sounders are paired together through strict spatial and temporal
collocation. The uniform scenes are selected by examining the collocated
Visible Infrared Imaging Radiometer Suite (VIIRS) pixels. Their brightness
temperature (BT) differences are then calculated by converting the spectra
onto common spectral grids. The results indicate that CrIS agrees well with
IASI on MetOp-A and IASI on MetOp-B at the long-wave IR (LWIR) and middle-wave IR (MWIR)
bands with 0.1–0.2 K differences. There are no apparent scene-dependent
patterns for BT differences between CrIS and IASI for individual spectral
channels. CrIS and AIRS are compared at the 25 spectral regions for both
polar and tropical SNOs. The combined global SNO data sets indicate that the
CrIS–AIRS BT differences are less than or around 0.1 K among 21 of 25
spectral regions and they range from 0.15 to 0.21 K in the remaining four
spectral regions. CrIS–AIRS BT differences in some comparison spectral
regions show weak scene-dependent features. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|