 |
| Titel |
MODIS 3 km aerosol product: applications over land in an urban/suburban region |
| VerfasserIn |
L. A. Munchak, R. C. Levy, S. Mattoo, L. A. Remer, B. N. Holben, J. S. Schafer, C. A. Hostetler, R. A. Ferrare |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 7 ; Nr. 6, no. 7 (2013-07-23), S.1747-1759 |
| Datensatznummer |
250017924
|
| Publikation (Nr.) |
 copernicus.org/amt-6-1747-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| MODerate resolution Imaging Spectroradiometer (MODIS) instruments aboard the
Terra and Aqua satellites have provided a rich dataset of aerosol information
at a 10 km spatial scale. Although originally intended for climate
applications, the air quality community quickly became interested in using
the MODIS aerosol data. However, 10 km resolution is not sufficient to
resolve local scale aerosol features. With this in mind, MODIS Collection 6
includes a global aerosol product with a 3 km resolution. Here, we
evaluate the 3 km product over the Baltimore–Washington D.C., USA, corridor
during the summer of 2011 by comparing with spatially dense aerosol data
measured by airborne High Spectral Resolution Lidar (HSRL) and a network of
44 sun photometers (SP) spaced approximately 10 km apart, collected as part
of the DISCOVER-AQ field campaign. The HSRL instrument shows that AOD can
vary by over 0.2 within a single 10 km MODIS pixel, meaning that higher
resolution satellite retrievals may help to better characterize aerosol
spatial distributions in this region. Different techniques for validating a
high-resolution aerosol product against SP measurements are considered.
Although the 10 km product is more statistically reliable than the 3 km
product, the 3 km product still performs acceptably with nearly two-thirds
of MODIS/SP collocations falling within an expected error envelope with high
correlation (R > 0.90), although with a high bias of ~ 0.06. The
3 km product can better resolve aerosol gradients and retrieve closer to
clouds and shorelines than the 10 km product, but tends to show more noise,
especially in urban areas. This urban degradation is quantified using
ancillary land cover data. Overall, we show that the MODIS 3 km product adds
new information to the existing set of satellite derived aerosol products and
validates well over the region, but due to noise and problems in urban areas,
should be treated with some degree of caution. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|