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| Titel |
Airborne measurements of aerosol scattering properties above the MABL over Bay of Bengal during W_ICARB – characteristics and spatial gradients |
| VerfasserIn |
V. Sreekanth, K. Krishna Moorthy, S. K. Satheesh, S. Suresh Babu, Vijayakumar S. Nair, K. Niranjan |
| 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 ; 29, no. 5 ; Nr. 29, no. 5 (2011-05-24), S.895-908 |
| Datensatznummer |
250017024
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| Publikation (Nr.) |
 copernicus.org/angeo-29-895-2011.pdf |
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| Zusammenfassung |
| Realizing the importance of aerosol characterization and addressing its
spatio-temporal heterogeneities over Bay of Bengal (BoB), campaign mode
observations of aerosol parameters were carried out using simultaneous
cruise, aircraft and land-based measurements during the Winter Integrated
Campaign for Aerosols gases and Radiation Budget (W_ICARB). Under this,
airborne measurements of total and hemispheric backscatter coefficients were
made over several regions of coastal India and eastern BoB using a three
wavelength integrating nephelometer. The measurements include high
resolution multi-level (ML) sorties for altitude profiles and bi-level (BL)
sorties for spatial gradients within and above the Marine Atmospheric
Boundary Layer (MABL) over BoB. The vertical profiles of the scattering
coefficients are investigated in light of the information on the vertical
structure of the atmospheric stability, which was derived from the
collocated GPS (Global Positioning System) aided radiosonde ascents. In
general, the altitude profiles revealed that the scattering coefficient
remained steady in the convectively well-mixed regions and dropped off above
the MABL. This decrease was quite rapid off the Indian mainland, while it
was more gradual in the eastern BoB. Investigation on horizontal gradients
revealed that the scattering coefficients over northern BoB are 3 to 4 times
higher compared to that of central BoB within and above the MABL. A
north-south gradient in scattering coefficients is observed over Port Blair
in the eastern BoB, with values decreasing from south to north, which is
attributed to the similar gradient in the surface wind speed, which can be
replicated in the sea salt abundance. The gradients are parameterized using
best-fit analytical functions. |
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