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Title: Study of air-sea interaction processes over the Arabian Sea and the Bay of Bengal using satellite data

Abstract

The main objective of this work is to study the latitudinal and seasonal variation of latent heat fluxes (LHF) and associated atmospheric and oceanic parameters over the Arabian Sea (AS) and the Bay of Bengal (BB) for the year 1988. A significant latitudinal variation is observed in LHF for most of the months over the AS and the BB, while other oceanic and atmospheric parameters are characterized by a strong latitudinal variation in nonmonsoon months. Seasonal variations in LHF are more significant at higher latitudes compared to lower latitudes over the AS and the BB. The effect of coastal upwelling near the Somali coast decreases LHF, while surface winds near the Indian coast during monsoon months increases LHF. A comparative study over the AS and the BB demonstrates higher PW and SST over the BB than over the AS. LHF is found to be greater over the AS than over the BB for nonmonsoon months. Correlation analysis indicates that LHF is found to be highly correlated with DQ (difference between the humidity at the surface and humidity near the surface) over the AS and weakly correlated over the BB during nonmonsoon months. Throughout the year, DQ is found to bemore » a dominant factor for LHF over the AS. However, WS exercised better control over the BB in generating LHF. SST and PW are found to be highly correlated with each other over the AS (r = 0.87) and the BB (r = 0.75) for nonmonsoon months. The correlation becomes weakly negative over the AS (r = 0.15) and weak over the BB (r = 0.26) during monsoon months. Precipitable water is found to have a high correlation with WS over the AS (r = 0.72). This unique feature is revealed by SSM/I data and has not been reported earlier due to paucity of data over this region.« less

Authors:
; ;  [1]
  1. Space Applications Centre, Ahmedabad (India)
Publication Date:
OSTI Identifier:
255668
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Climate; Journal Volume: 8; Journal Issue: 12; Other Information: PBD: Dec 1995
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ARABIAN SEA; HEAT FLUX; SEASONAL VARIATIONS; INDIAN OCEAN; ATMOSPHERIC CIRCULATION; OCEANIC CIRCULATION

Citation Formats

Gautam, N., Simon, B., and Pandey, P.C. Study of air-sea interaction processes over the Arabian Sea and the Bay of Bengal using satellite data. United States: N. p., 1995. Web. doi:10.1175/1520-0442(1995)008<2947:SOASIP>2.0.CO;2.
Gautam, N., Simon, B., & Pandey, P.C. Study of air-sea interaction processes over the Arabian Sea and the Bay of Bengal using satellite data. United States. doi:10.1175/1520-0442(1995)008<2947:SOASIP>2.0.CO;2.
Gautam, N., Simon, B., and Pandey, P.C. Fri . "Study of air-sea interaction processes over the Arabian Sea and the Bay of Bengal using satellite data". United States. doi:10.1175/1520-0442(1995)008<2947:SOASIP>2.0.CO;2.
@article{osti_255668,
title = {Study of air-sea interaction processes over the Arabian Sea and the Bay of Bengal using satellite data},
author = {Gautam, N. and Simon, B. and Pandey, P.C.},
abstractNote = {The main objective of this work is to study the latitudinal and seasonal variation of latent heat fluxes (LHF) and associated atmospheric and oceanic parameters over the Arabian Sea (AS) and the Bay of Bengal (BB) for the year 1988. A significant latitudinal variation is observed in LHF for most of the months over the AS and the BB, while other oceanic and atmospheric parameters are characterized by a strong latitudinal variation in nonmonsoon months. Seasonal variations in LHF are more significant at higher latitudes compared to lower latitudes over the AS and the BB. The effect of coastal upwelling near the Somali coast decreases LHF, while surface winds near the Indian coast during monsoon months increases LHF. A comparative study over the AS and the BB demonstrates higher PW and SST over the BB than over the AS. LHF is found to be greater over the AS than over the BB for nonmonsoon months. Correlation analysis indicates that LHF is found to be highly correlated with DQ (difference between the humidity at the surface and humidity near the surface) over the AS and weakly correlated over the BB during nonmonsoon months. Throughout the year, DQ is found to be a dominant factor for LHF over the AS. However, WS exercised better control over the BB in generating LHF. SST and PW are found to be highly correlated with each other over the AS (r = 0.87) and the BB (r = 0.75) for nonmonsoon months. The correlation becomes weakly negative over the AS (r = 0.15) and weak over the BB (r = 0.26) during monsoon months. Precipitable water is found to have a high correlation with WS over the AS (r = 0.72). This unique feature is revealed by SSM/I data and has not been reported earlier due to paucity of data over this region.},
doi = {10.1175/1520-0442(1995)008<2947:SOASIP>2.0.CO;2},
journal = {Journal of Climate},
number = 12,
volume = 8,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 1995},
month = {Fri Dec 01 00:00:00 EST 1995}
}
  • SATDAS (Satellite Data Acquisition System) is a data acquisition system utilizing a satellite telemetry link that has been developed for Brookhaven National Laboratory, Upton, N.Y. It is to be used for air-sea interaction and oceanographic experiments. It is microprocessor-based with all functions under software control. These include data interrogation and acquisition, timing control, tape storage, and data telemetry. Data processing programs are included to calculate averages, variances, and covariances. Diagnostic routines are included for system self-test. The use of the microprocessor has resulted in a very simple configuration with an accordingly high level of reliability. Telemetry to shore is viamore » the GOES (Geostationary Operational Environmental Satellite). SATDAS provides a unique combination of in situ processing, system self-check, on-board recording, and satellite telemetry.« less
  • An observation system used to study the marine boundary layer over the Bay of Bengal at Digha Beach, West Bengal, India, as part of the International Monsoon Experiments (MONEX 79) is described in this paper. It was a portable system that was designed to facilitate ease in transportation, to be quick to assemble, independent and self-sufficient in power supply, and to operate in remote sites for long periods of time. The experiments consisted of measurements of atmospheric turbulence and fluxes of momentum, heat, and water vapor from a 10 m high coastal meteorological tower. Mean meteorological parameters were measured withmore » an automated electronic weather station. Wind speed and direction profiles in the planetary boundary layer were obtained with pilot balloon soundings.« less
  • Measurements on radon daughter's activities over the Arabian Sea were carried out during the period 19 May to 9 July, 1973, under the joint Indo-USSR MONEX-73 project. The data were collected on board the ships of the Indian Navy cruising between 19--21degreeN within longitudes 60--73degreeE and the two USSR vessels Okean and Prilive cruising between latitudes 0--10degreeN and 10--18degreeN, respectively. The results show that there is a significant increase in radon daughter's activity at about 19--21degreeN, the average level being of the order of about 8pCi m/sup -3/ as compared to 1--2 pCi m/sup -3/ at lower latitudes. This ismore » explained, on the basis of synoptic charts and available sounding data, as being due to the normal wind and pressure pattern prevailing during the monsoon months which results in the transport of continental air from Arabia and Pakistan and its mixing with the maritime monsoon air mass of Southern Hemispheric origin. The significant increase in radon activity on some days of the cruise was mainly due either to the existence of disturbances like depressions, cyclonic storms, etc., over the north Arabian sea, or to the passage of western disturbances at relatively lower latitudes (along approx.25degreeN) and their associated circulation patterns. These phenomena favor significant transport of continental air from the north and west. The mixing of this air mass with air masses of low radon concentrations results in increasing the average radon levels from 1 to 8pCi m/sup -3/.« less