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Coherent structures contributions in fluxes of momentum and heat at two tropical sites during pre-monsoon thunderstorm season
Stockholms universitet, Naturvetenskapliga fakulteten, Meteorologiska institutionen (MISU).
2014 (Engelska)Ingår i: International Journal of Climatology, ISSN 0899-8418, E-ISSN 1097-0088, Vol. 34, nr 5, s. 1575-1584Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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 (10Hz) of wind and temperature at Kharagpur (22 degrees 30N, 87 degrees 20E) for years 2007, 2009, and 2010, and at Ranchi (23 degrees 25N, 85 degrees 26E) 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.

Ort, förlag, år, upplaga, sidor
2014. Vol. 34, nr 5, s. 1575-1584
Nyckelord [en]
coherent structures, heat flux, momentum flux
Nationell ämneskategori
Meteorologi och atmosfärforskning
Identifikatorer
URN: urn:nbn:se:su:diva-105519DOI: 10.1002/joc.3785ISI: 000333759100019OAI: oai:DiVA.org:su-105519DiVA, id: diva2:728546
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AuthorCount:2;

Tillgänglig från: 2014-06-24 Skapad: 2014-06-24 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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Tyagi, Bhishma
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Meteorologiska institutionen (MISU)
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International Journal of Climatology
Meteorologi och atmosfärforskning

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