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Impact of tropical cyclones on the intensity and phase propagation of fall Wyrtki jets

Sreenivas, P and Chowdary, JS and Gnanaseelan, C (2012) Impact of tropical cyclones on the intensity and phase propagation of fall Wyrtki jets. Geophysical Research Letters, 39 (22).

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Abstract

Observations and model simulations are used to study the impact of tropical cyclones (TC) on the fall Wyrtki jets (WJ). These strong narrow equatorial currents peak during November and play a vital role in the energy and mass transport in the tropical Indian Ocean (TIO). Maximum number of TCs is observed over TIO during November with longer than normal life span (8-15 days). These TCs enhance equatorial westerly winds (surface) and amplify monthly mean WJs (both at surface and subsurface) by 0.4 ms-1 (anomalies exceed 0.7 ms-1 during TC), which is about half of the climatological amplitude. Intensified WJs increase the heat content of eastern TIO and modulate air-sea interaction. It is also shown that movement of TCs is mainly responsible for the westward phase propagation of WJs, a previously unexplored mechanism. These features are evident in ECCO2 simulations as well.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Air sea interactions; Life span; Model simulation; Phase propagation; TiO; Tropical cyclone; Tropical Indian ocean; Westerly winds, Computer simulation, Hurricanes, air-sea interaction; climate modeling; climatology; energy flux; jet; mass transport; tropical cyclone, Indian Ocean; Indian Ocean (Tropical)
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 13 Mar 2014 10:43
Last Modified: 13 Mar 2014 10:43
URI: http://moeseprints.incois.gov.in/id/eprint/426

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