 |
| Titel |
Comparison of MODIS and AERONET derived aerosol optical depth over the Ganga Basin, India |
| VerfasserIn |
S. N. Tripathi, Sagnik Dey, A. Chandel, S. Srivastava, Ramesh P. Singh, B. N. Holben |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 4 ; Nr. 23, no. 4 (2005-06-03), S.1093-1101 |
| Datensatznummer |
250015205
|
| Publikation (Nr.) |
 copernicus.org/angeo-23-1093-2005.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Moderate Resolution Imaging Spectroradiometer (MODIS) onboard EOS Terra
measures global aerosol optical depth and optical properties since 2000.
MODIS aerosol products are freely available and are being used for numerous
studies. In this paper, we present a comparison of aerosol optical depth
(AOD) retrieved from MODIS with Aerosol Robotic Network (AERONET) data for
the year 2004 over Kanpur, an industrial city lying in the Ganga Basin in
the northern part of India. AOD retrieved from MODIS (τaMODIS) at
0.55µm wavelength has been compared with the AERONET derived AOD
(τaAERONET), within an optimum space-time window. Although the
correlation between τaMODIS and τaAERONET during the
post-monsoon and winter seasons (R2~0.71) is almost equal to
that during the pre-monsoon and monsoon seasons (R2~0.72),
MODIS is found to overestimate AOD during the pre-monsoon and monsoon period
(characterized by severe dust loading) and underestimate during the
post-monsoon and winter seasons. The absolute difference between τaMODIS and τaAERONET is found to be low (0.12±0.11)
during the non-dust loading season and much higher (0.4±0.2) during
dust-loading seasons. The absolute error in τaMODIS is found to
be about ~25% of the absolute values of τaMODIS. Our
comparison shows the importance of modifying the existing MODIS algorithm
during the dust-loading seasons, especially in the Ganga Basin in northern
part of India. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|