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A pathway connecting the monsoonal heating to the rapid Arctic ice melt

This study provides a monsoonal link to the rapid Arctic ice melt. Each year the planetary scale African Asian monsoonal outflow near the tropopause level carries a large anticyclonic gyre that has a longitudinal spread which occupies nearly half of the entire tropics. In recent years, the south Asian summer monsoon has experienced increased rainfall over northwest India and Pakistan, and it has also contributed to more intense local anticyclonic outflows from this region. The western lobes of these intense upper high pressure areas carry outflows with large heat fluxes from the monsoon belt towards central Asia and eventually to the region of the rapid ice melt of the Canadian Arctic. In this study this spectacular pathway has been defined from air flow trajectories, heat content and heat flux anomalies. Most of these show slowly increasing trends in the last 20 years. The monsoonal connection to the rapid Arctic ice melt is a new contribution of this study. This is shown from the passage of vertical columns of large positive values of the heat content anomaly that can be traced from the Asian monsoon belt to the Canadian Arctic. The heat flux along these episodic and intermittently active pathways is shown to be considerably larger than the poleward flux across latitude circles and from the oceans.

About the presenter
Presenter(s): 
T.N. Krishnamurti

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Where

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Room: 
Main Seminar Room

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When
Date and time: 
Tuesday, November 19, 2013 - 3:30pm