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Diurnal and seasonal variation of heat fluxes over an agricultural field in southeastern Nepal
Acharya, RH (Acharya, Ram Hari)1; Sigdel, M (Sigdel, Madan)1; Ma, YM (Ma, Yaoming)2,3,4; Wang, BB (Wang, Binbin)2,3
Source PublicationTHEORETICAL AND APPLIED CLIMATOLOGY
2019
Volume137Issue:2020-03-04Pages:2949-2960
DOI10.1007/s00704-019-02790-3
Abstract

The southeastern part of Nepal is traditionally known as the entrance of the South Asian summer monsoon system (SASM) and plays a vital role in the development of the national agro-economy. This research examined the diurnal and seasonal variation in the heat and mass fluxes. The study area lies in the agricultural fields that maintain crop cycles. Half-hourly data for a period of 54months starting in October 2012 were obtained from the Tarahara surface flux observation system (SFOS), and the analyzed data included fast response eddy covariance measurements. The results show that all radiation components changed diurnally and seasonally, except for downward longwave radiation, which revealed weak diurnal variation during winter months. The winter surface albedo of the agricultural field was higher than the summer surface albedo and varied from 0.13 to 0.19. Latent heat release was found to be strongest during the summer season and was associated with atmospheric moisture content and precipitation. Sensible heat becomes weaker during summer and exhibits significant variation during winter months. The sensible heat flux increased rapidly with the increasing radiation flux during the pre-monsoon, which is a major energy source for driving atmospheric systems. The partitioning of energy into turbulent fluxes was also analyzed and it was found that the released latent heat consumed 67% of the net radiation; furthermore, 21% was consumed by the released sensible heat. The response of the land surface heat fluxes to the large-scale circulation system was clearly identified on the basis of the highest peak values observed in 2015 and 2016.

Subject AreaAtmospheric Sciences
WOS IDWOS:000477054700093
Language英语
Indexed BySCI
KeywordEnergy-balance Closure Carbon-dioxide Net-radiation Co2 Fluxes Water Evapotranspiration Moisture Prairie Monsoon Forest
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
Cooperation Status国际
ISSN0177-798X
Department环境变化与地表过程重点实验室
URL查看原文
PublisherSPRINGER WIEN
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9212
Collection图书馆
Corresponding AuthorSigdel, M (Sigdel, Madan); Ma, YM (Ma, Yaoming)
Affiliation1.Tribhuvan Univ, Cent Dept Hydrol & Meteorol, Kathmandu, Nepal;
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Acharya, RH ,Sigdel, M ,Ma, YM ,et al. Diurnal and seasonal variation of heat fluxes over an agricultural field in southeastern Nepal[J]. THEORETICAL AND APPLIED CLIMATOLOGY,2019,137(2020-03-04):2949-2960.
APA Acharya, RH ,Sigdel, M ,Ma, YM ,&Wang, BB .(2019).Diurnal and seasonal variation of heat fluxes over an agricultural field in southeastern Nepal.THEORETICAL AND APPLIED CLIMATOLOGY,137(2020-03-04),2949-2960.
MLA Acharya, RH ,et al."Diurnal and seasonal variation of heat fluxes over an agricultural field in southeastern Nepal".THEORETICAL AND APPLIED CLIMATOLOGY 137.2020-03-04(2019):2949-2960.
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