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Coherent structures contributions in fluxes of momentum and heat at two tropical sites during pre‐monsoon thunderstorm season
Author(s) -
Tyagi Bhishma,
Satyanarayana A. N. V.
Publication year - 2014
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.3785
Subject(s) - thunderstorm , climatology , monsoon , atmospheric sciences , flux (metallurgy) , environmental science , momentum (technical analysis) , physics , meteorology , geology , chemistry , finance , economics , organic chemistry
An attempt has been made to differentiate percentage contribution of coherent structures ( CS ) in the turbulent fluxes of heat and momentum during thunderstorm days ( TD ) and non‐thunderstorm days ( NTD ) at two tropical sites. Pre‐monsoon months (Marcha to May) fast response data (10 Hz) of wind and temperature at Kharagpur (22°30′N, 87°20′E) for years 2007, 2009, and 2010, and at Ranchi (23°25′N, 85°26′E) for years 2008–2010 have been used. The contributions were calculated after decomposing the time series using wavelet technique by two methods: (1) the method of quadrant analysis for each scale, and (2) the method of zero‐crossing. Contributions of CS in momentum flux are higher in TD than NTD , whereas for heat flux CS contribution is higher for NTD to that of TD at both sites; however, values are different at both sites and by each method as well. Significant percentages of contributions of CS to the total flux are noticed at both the sites.