 |
| Titel |
Aerosol airmass type mapping over the Urban Mexico City region from space-based multi-angle imaging |
| VerfasserIn |
F. Patadia, R. A. Kahn, J. A. Limbacher, S. P. Burton, R. A. Ferrare, C. A. Hostetler, J. W. Hair |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 18 ; Nr. 13, no. 18 (2013-09-27), S.9525-9541 |
| Datensatznummer |
250085715
|
| Publikation (Nr.) |
 copernicus.org/acp-13-9525-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Using Multi-angle Imaging SpectroRadiometer (MISR) and sub-orbital
measurements from the 2006 INTEX-B/MILAGRO field campaign, in this study we
explore MISR's ability to map different aerosol air mass types over the
Mexico City metropolitan area. The aerosol air mass distinctions are based
on shape, size and single scattering albedo retrievals from the MISR
Research Aerosol Retrieval algorithm. In this region, the research algorithm
identifies dust-dominated aerosol mixtures based on non-spherical particle
shape, whereas spherical biomass burning and urban pollution particles are
distinguished by particle size. Two distinct aerosol air mass types based on
retrieved particle microphysical properties, and four spatially distributed
aerosol air masses, are identified in the MISR data on 6 March 2006. The
aerosol air mass type identification results are supported by coincident,
airborne high-spectral-resolution lidar (HSRL) measurements. Aerosol optical
depth (AOD) gradients are also consistent between the MISR and sub-orbital
measurements, but particles having single-scattering albedo of ≈0.7
at 558 nm must be included in the retrieval algorithm to produce good
absolute AOD comparisons over pollution-dominated aerosol air masses. The
MISR standard V22 AOD product, at 17.6 km resolution, captures the observed
AOD gradients qualitatively, but retrievals at this coarse spatial scale and
with limited spherical absorbing particle options underestimate AOD and do
not retrieve particle properties adequately over this complex urban region.
However, we demonstrate how AOD and aerosol type mapping can be accomplished
with MISR data over complex urban regions, provided the retrieval is
performed at sufficiently high spatial resolution, and with a rich enough
set of aerosol components and mixtures. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|