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| Titel |
Aerosol optical depth (AOD) retrieval using simultaneous GOES-East and GOES-West reflected radiances over the western United States |
| VerfasserIn |
H. Zhang, R. M. Hoff, S. Kondragunta, I. Laszlo, A. Lyapustin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 2 ; Nr. 6, no. 2 (2013-02-26), S.471-486 |
| Datensatznummer |
250017811
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| Publikation (Nr.) |
 copernicus.org/amt-6-471-2013.pdf |
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| Zusammenfassung |
| Aerosol optical depth (AOD) in the western United States is observed
independently by both the (Geostationary Operational Environmental Satellites) GOES-East and GOES-West imagers. The GASP (GOES
Aerosol/Smoke Product) aerosol optical depth retrieval algorithm treats each
satellite as a unique sensor and thus obtains two separate aerosol optical
depth values at the same time for the same location. The TOA (the top of the
atmosphere) radiances and the associated derived optical depths can be quite
different due to the different viewing geometries with large difference in
solar-scattering angles. In order to fully exploit the simultaneous
observations and generate consistent AOD retrievals from the two satellites,
the authors develop a new "hybrid" aerosol optical depth retrieval
algorithm that uses data from both satellites. The algorithm uses both
GOES-East and GOES-West visible channel TOA reflectance and daily average AOD
from GOES Multi-Angle Implementation of Atmospheric Correction (GOES-MAIAC)
on low AOD days (AOD less than 0.3), when diurnal variation of AOD is low, to
retrieve surface BRDF (Bidirectional Reflectance Distribution Function). The
known BRDF shape is applied on subsequent days to retrieve BRDF and AOD. The
algorithm is validated at three AERONET sites over the western US. The AOD
retrieval accuracy from the "hybrid" technique using the two satellites is
similar to that from one satellite over UCSB (University of California Santa
Barbara) and Railroad Valley, Nevada. Improvement of the accuracy is observed at
Boulder, Colorado. The correlation coefficients between the GOES AOD and AERONET AOD
are in the range of 0.67 to 0.81. More than 74% of AOD retrievals are
within the error of ±(0.05 + 0.15 τ) compared to AERONET AOD. The
hybrid algorithm has more data coverage compared to the single satellite
retrievals over surfaces with high surface reflectance. For single
observation areas the number of valid AOD data increases from the use of
two-single satellite algorithms by 5–80% for the three sites. With the
application of the new algorithm, consistent AOD retrievals and better
retrieval coverages can be obtained using the data from the two GOES
satellite imagers. |
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