DocumentCode :
1988517
Title :
A computer model to study the variability of grid-based Sea Surface Temperature (SST) values derived from AQUA/AMSRE satellite data and its influence on the onset of South West Monsoon near the Kerala coastal region in India
Author :
Chakravarty, S.C.
Author_Institution :
Indian Space Res. Organ. Headquarters, Bangalore, India
fYear :
2009
fDate :
12-14 Aug. 2009
Firstpage :
1
Lastpage :
5
Abstract :
A MATLAB-VBA program has been developed to generate contour maps of daily SST values over the whole globe pointing specifically to the Pacific Ocean region (covering -20deg to 10deg in latitude & 80deg to 240deg in longitude) affected by ENSO (El Nino & southern oscillation) events. Broad monthly time series of southern oscillation index (SOI) and that of total pixel (25 km times 25 km resolution) numbers having SSTs distributed between 27-31degC with 1degC interval are examined for different years of 2003-08 before the onset of SW monsoon. The pre-monsoon (Jan-Apr) averages showed that only in 4 out of 38 years of data, SOI exceeded 15 in the negative scale (strong El-Nino event) and for all of these years the monsoon onset dates were delayed. For all other values of SOI ranging between -14 to +15 no definite correlation exists. While there has been no occurrence of strong El Nino or La Nina events during 2003-08, the monsoon onset dates varied widely from 18 May to 8 June over Kerala coast. Results of this study show that the pattern of SST distribution during January-May of any year provides a better link to the likely onset dates. While larger number of pixels (Gt15,000-20,000) in the lower temperature band (27-28degC) produces normal monsoon onset, a smaller number (Lt10,000-15,000) gives rise to anomalous onset dates.
Keywords :
cartography; geophysics computing; mathematics computing; ocean temperature; oceanographic techniques; time series; AQUA-AMSRE satellite data; El Nino; India; Kerala coastal region; MATLAB-VBA program; Pacific Ocean region; South West monsoon; broad monthly time series; computer model; contour maps; grid-based sea surface temperature value; monsoon onset dates; southern oscillation index; temperature 27 degC to 28 degC; temperature 27 degC to 31 degC; Computer languages; Delay; Grid computing; Large-scale systems; Mathematical model; Mesh generation; Ocean temperature; Satellites; Sea measurements; Sea surface; ENSO; Indian Monsoon onset; SOI; SST anomalies;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoinformatics, 2009 17th International Conference on
Conference_Location :
Fairfax, VA
Print_ISBN :
978-1-4244-4562-2
Electronic_ISBN :
978-1-4244-4563-9
Type :
conf
DOI :
10.1109/GEOINFORMATICS.2009.5292916
Filename :
5292916
Link To Document :
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