Structure of momentum and heat flux events in the atmospheric surface layer

Kumar, SR and Narasimha, R and Prabhu, A (1995) Structure of momentum and heat flux events in the atmospheric surface layer. In: 6th Asian Congress of Fluid Mechanics, 22-26 May 1995, Singapore.

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Time series data of momentum and heat flux, acquired during the monsoon season of 1990 in the surface layer at Jodhpur, Rajasthan, India, are analyzed using a new and simple event detection technique. This technique based on level thresholds in terms of standard deviation, identifies events in the flux signals that account for virtually the entire flux, thus enabling for the first time a full episodic description of the flux time series. Under near-neutral conditions, this description implies that the flow generates positive and negative fluxes over about 35 percent and 15 percent of the time, respectively; at other times, the flow is idle or passive. A strong correlation is found between momentum and heat flux events. The characteristic signature of the events and various statistical parameters concerning them are evaluated.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Surface layers;Heat flux;Atmospheric stratification
Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
Depositing User: M/S ICAST NAL
Date Deposited: 22 Sep 2006
Last Modified: 24 Aug 2015 08:44

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