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| Titel |
Thermodynamic structure of the Atmospheric Boundary Layer over the Arabian Sea and the Indian Ocean during pre-INDOEX and INDOEX-FFP campaigns |
| VerfasserIn |
M. V. Ramana, P. Krishnan, S. Muraleedharan Nair, P. K. Kunhikrishnan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 22, no. 8 ; Nr. 22, no. 8 (2004-09-07), S.2679-2691 |
| Datensatznummer |
250014956
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| Publikation (Nr.) |
 copernicus.org/angeo-22-2679-2004.pdf |
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| Zusammenfassung |
| Spatial and temporal variability of the Marine Atmospheric Boundary Layer (MABL)
height for the Indian Ocean Experiment (INDOEX) study period are examined using the data
collected through Cross-chained LORAN (Long-Range Aid to Navigation) Atmospheric
Sounding System (CLASS) launchings during the Northern Hemispheric winter monsoon period.
This paper reports the results of the analyses of the data collected during the pre-INDOEX
(1997) and the INDOEX-First Field Phase (FFP; 1998) in the latitude range 14°N to 20°S over
the Arabian Sea and the Indian Ocean. Mixed layer heights are derived from thermodynamic
profiles and they indicated the variability of heights ranging from 400m to 1100m during
daytime depending upon the location. Mixed layer heights over the Indian Ocean are slightly
higher during the INDOEX-FFP than the pre-INDOEX due to anomalous conditions
prevailing during the INDOEX-FFP. The trade wind inversion height varied from 2.3km to 4.5km during the
pre-INDOEX and from 0.4km to 2.5km during the INDOEX-FFP. Elevated plumes of polluted
air (lofted aerosol plumes) above the marine boundary layer are observed from thermodynamic
profiles of the lower troposphere during the INDOEX-FFP. These elevated plumes are examined
using 5-day back trajectory analysis and show that one group of air mass travelled a long way
from Saudi Arabia and Iran/Iraq through India before reaching the location of measurement,
while the other air mass originates from India and the Bay of Bengal. |
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