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A composite energetics study for contrasting south west monsoon years in the recent decade

Author(s): S. DUTTA | S. G. NARKHEDKAR | S. DEVI | D. R. SIKKA

Journal: Atmósfera
ISSN 0187-6236

Volume: 25;
Issue: 2;
Start page: 109;
Date: 2012;
Original page

Keywords: Energetics | contrasting SW monsoon season

An attempt has been made to make a composite energetics study for the three contrasting types south west monsoon season (SWMS) over India, viz. marginally normal SWMS (2000 and 2001 when seasonal total rainfall was very close to 90%), normal SWMS (2003, 2005, 2006, 2007 and 2008 when seasonal total rainfall was very close to 100% of its long period average) and deficient SWMS (2002, 2004 and 2009, when seasonal total rainfall was less than 90% of its long period average). For that, decadal average for the decade 2000-2009 and anomaly, based on above decadal average, for individual year of this decade, of different energy terms, their generation and conversion among different terms have been computed daily during 1 May-30 September in the recent decade (2000-2009) over a limited region between 65º E to 95º E, 5º N to 35 ºN. These computations are based on daily NCEP 2.5º x 2.5º data during 1 May-30 September of the above ten years. The composite of these anomalies have then been constructed for the deficient monsoon years (2002, 2004 and 2009), marginally normal monsoon years (2000 and 2001) and for the normal monsoon years (2003, 2005, 2006, 2007 and 2008). In the decadal average, a steady fall in C(AZ, KZ) and C(AE, KE) till August and steady rise in C(AZ, AE) till July are noticed, indicating a suppressed mean monsoon circulation due to the influence of mid latitude baroclinic westerly systems. Analysis of the composite anomaly of different energetics parameter indicates that the deficient SWM, in the decade under study, are characterized by weaker mean monsoon circulation, as compared to normal or marginally normal SWM, in daily, monthly and seasonal scale, due to anomalous influence of mid latitude baroclinic westerly systems.
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