Variations of surface boundary layer parameters associated with Cyclone Gonu over the Arabian Sea using QuikSCAT data Journal Article


Author(s): P. R. Jayakrishnan; C A Babu
Article Title: Variations of surface boundary layer parameters associated with Cyclone Gonu over the Arabian Sea using QuikSCAT data
Abstract: This study attempted to quantify the variations of the surface marine atmospheric boundary layer (MABL) parameters associated with the tropical Cyclone Gonu formed over the Arabian Sea during 30 May–7 June 2007 (just after the monsoon onset). These characteristics were evaluated in terms of surface wind, drag coefficient, wind stress, horizontal divergence, and frictional velocity using 0.5◦ × 0.5◦ resolution Quick Scatterometer (QuikSCAT) wind products. The variation of these different surface boundary layer parameters was studied for three defined cyclone life stages: prior to the formation, during, and after the cyclone passage. Drastic variations of the MABL parameters during the passage of the cyclone were observed. The wind strength increased from 12 to 22 m s−1 in association with different stages of Gonu. Frictional velocity increased from a value of 0.1–0.6 m s−1 during the formative stage of the system to a high value of 0.3–1.4 m s−1 during the mature stage. Drag coefficient varied from 1.5 × 10−3 to 2.5 × 10−3 during the occurrence of Gonu. Wind stress values varied from 0.4 to 1.1 N m−2. Wind stress curl values varied from 10 × 10−7 to 45 × 10−7 N m−3. Generally, convergent winds prevailed with the numerical value of divergence varying from 0 to –4 × 10−5 s−1. Maximum variations of the wind parameters were found in the wall cloud region of the cyclone. The parameters returned to normally observed values in 1–3 days after the cyclone passage.
Journal Title: International Journal of Remote Sensing
Volume: 34
Issue: 7
ISSN: ISSN 0143-1161 print/ISSN 1366-5901 online
Publisher: Taylor & Francis  
Date Published: 2013-04
Start Page: 2417
End Page: 2431
Language: English
Copyright Statement: © 2013 Taylor & Francis
Sponsor: CUSAT
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