 |
| Titel |
Estimating the maritime component of aerosol optical depth and its dependency on surface wind speed using satellite data |
| VerfasserIn |
Y. Lehahn, I. Koren, E. Boss, Y. Ben-Ami, O. Altaratz |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 14 ; Nr. 10, no. 14 (2010-07-22), S.6711-6720 |
| Datensatznummer |
250008648
|
| Publikation (Nr.) |
 copernicus.org/acp-10-6711-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| Six years (2003–2008) of satellite measurements of aerosol parameters from
the Moderate Resolution Imaging Spectroradiometer (MODIS) and surface wind
speeds from Quick Scatterometer (QuikSCAT), the Advanced Microwave Scanning
Radiometer (AMSR-E), and the Special Sensor Microwave Imager (SSM/I), are
used to provide a comprehensive perspective on the link between surface wind
speed and marine aerosol optical depth over tropical and subtropical oceanic
regions. A systematic comparison between the satellite derived fields in
these regions allows to: (i) separate the relative contribution of
wind-induced marine aerosol to the aerosol optical depth; (ii) extract an
empirical linear equation linking coarse marine aerosol optical depth and
wind intensity; and (iii) identify a time scale for correlating marine
aerosol optical depth and surface wind speed. The contribution of wind
induced marine aerosol to aerosol optical depth is found to be dominated by
the coarse mode elements. When wind intensity exceeds 4 m/s, coarse marine
aerosol optical depth is linearly correlated with the surface wind speed,
with a remarkably consistent slope of 0.009±0.002 s/m. A detailed
time scale analysis shows that the linear correlation between the fields is
well kept within a 12 h time frame, while sharply decreasing when the
time lag between measurements is longer. The background aerosol optical
depth, associated with aerosols that are not produced in-situ through wind
driven processes, can be used for estimating the contributions of terrestrial
and biogenic marine aerosol to over-ocean satellite retrievals of aerosol
optical depth. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|