Intra-seasonal and Inter-annual variability of Bowen Ratio over rain-shadow region of North peninsular India

被引：0
作者：
S. B Morwal
S. G Narkhedkar
B Padmakumari
R. S Maheskumar
C. G Deshpande
J. R Kulkarni
机构：
[1] Indian Institute of Tropical Meteorology,
来源：
Theoretical and Applied Climatology | 2017年 / 128卷
关键词：
Monsoon Season; Latent Heat Flux; Convective Cloud; Bowen Ratio; Sensible Heat Flux;
D O I：
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中图分类号：
学科分类号：
摘要：
Intra-seasonal and inter-annual variability of Bowen Ratio (BR) have been studied over the rain-shadow region of north peninsular India during summer monsoon season. Daily grid point data of latent heat flux (LHF), sensible heat flux (SHF) from NCEP/NCAR Reanalysis for the period 1970–2014 have been used to compute daily area-mean BR. Daily grid point rainfall data at a resolution of 0.25° × 0.25° from APHRODITE’s Water Resources for the available period 1970–2007 have been used to study the association between rainfall and BR. The study revealed that BR rapidly decreases from 4.1 to 0.29 in the month of June and then remains nearly constant at the same value (≤0.1) in the rest of the season. High values of BR in the first half of June are indicative of intense thermals and convective clouds with higher bases. Low values of BR from July to September period are indicative of weak thermals and convective clouds with lower bases. Intra-seasonal and inter-annual variability of BR is found to be inversely related to precipitation over the region. BR analysis indicates that the land surface characteristics of the study region during July–September are similar to that over oceanic regions as far as intensity of thermals and associated cloud microphysical properties are concerned. Similar variation of BR is found in El Nino and La Nina years. During June, an increasing trend is observed in SHF and BR and decreasing trend in LHF from 1976 to 2014. Increasing trend in the SHF is statistically significant.
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页码：835 / 844
页数：9
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共 125 条
  • [1] Bowen IS(1926)The ratio of heat losses by conduction and by evaporation from any water surface Phys Rev 27 779-787
  • [2] Cui Y(2009)Comparison of sensible and latent heat fluxes during the transition season over the western Tibetan Plateau from reanalysis datasets Prog Nat Sci 19 719-726
  • [3] Wang C(1978)The variation of eddy fluxes with height and fetch in an unstable atmosphere J Meteorol Soc Jpn 56 19-33
  • [4] Dyer AJ(1992)Surface temperature patterns associated with the southern oscillation J Clim 5 557-563
  • [5] Garratt JR(2004)Sensible and latent heat flux in the tropical Pacific from satellite multi-sensor data Remote Sensing Environ 90 166-177
  • [6] Halpert MS(1996)The NCEP/NCAR 40-year reanalysis project Bull Am Meteorol Soc 77 437-471
  • [7] Ropelewski CF(2012)The cloud aerosol interactions and precipitation enhancement experiment (CAIPEEX): overview and preliminary results Curr Sci 102 413-425
  • [8] Jo YH(2009)“Warm rain” in the tropics: seasonal and regional distributions based on 9 yr of TRMM data J Clim 22 767-779
  • [9] Yan XH(1994)Diurnal energy balance studies over wheat using Bowen ratio energy balance method Mausam 45 333-336
  • [10] Pan J(2012)Cloud microphysical properties over Indian monsoon regions during CAIPEEX-2009 J Atmos Solar Terr Phys 81–82 76-85
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