干旱区生态环境知识资源中心(Arid): Field-scale intercomparison analysis of ecosystems in partitioning surface energy balance components in a semi-arid environment

Arid

DOI	10.1016/j.ecohyd.2018.06.005
	Field-scale intercomparison analysis of ecosystems in partitioning surface energy balance components in a semi-arid environment
	Sridhar, Venkataramana 1; Billah, Mirza M.1,2; Valayamkunnath, Prasanth 1
通讯作者	Sridhar, Venkataramana
来源期刊	ECOHYDROLOGY & HYDROBIOLOGY
ISSN	1642-3593
EISSN	2080-3397
出版年	2019
卷号	19 期号:1 页码:24-37
英文摘要	In situ land surface flux monitoring studies can be useful to extrapolate canopy scales processes to weather and climate analysis. This paper evaluated the interaction between ecosystems and environmental forces in partitioning available energy from multi-sensor platform in the semi-arid region of the Snake River basin in Idaho, USA. Field measurements of latent and sensible heat fluxes using scintillometers and the eddy covariance flux data during the growing season in 2011-2012 were able to identify spatial and seasonal variability in partitioning of surface energy components, including net radiation, latent, sensible, ground heat fluxes. Available energy measured from sagebrush, cheatgrass and lodgepole pine ecosystems indicate that 79%, 58%, and 62% partitioned into latent heat fluxes of 24%, 20%, and 35%, respectively. Role of precipitation and soil moisture, which in turn influenced the latent and sensible heat flux more profoundly were evident in sagebrush and cheatgrass as compared to lodgepole pine with a higher vapor pressure deficit and decreased relative humidity especially in the summertime between June and September. The Budyko analysis revealed that aridity index ratio was found to vary between 3 and 5 suggesting a degree of aridity in these ecosystems. Evapotranspiration (ET) was severely constrained by lack of soil moisture for cheatgrass and sagebrush when compared to the lodgepole pine ecosystem. In addition, it has been concluded that the sagebrush ecosystem regions can serve as recharge zones for enhancing groundwater storage in the Snake River Plains as they exhibit lower evapotranspiration rates in comparison to other ecosystems. This study emphasizes that use of field data can provide a better understanding of boundary layer fluxes, which in turn can help validate the fluxes simulated by land surface models. Implications of these results include the need for sustained monitoring and land-atmosphere interaction studies that are beneficial for effective water resource assessment and management. (C) 2018 European Regional Centre for Ecohydrology of the Polish Academy of Sciences. Published by Elsevier B.V. All rights reserved.
英文关键词	Eddy covariance Latent heat flux Scintillometer Sensible heat flux Surface energy partitioning
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000462037800003
WOS关键词	LARGE-APERTURE SCINTILLOMETER ; SENSIBLE HEAT-FLUX ; SOIL-MOISTURE ; CARBON-DIOXIDE ; FEEDBACK MECHANISM ; EDDY COVARIANCE ; WATER-RESOURCES ; EVAPOTRANSPIRATION ; MODEL ; VEGETATION
WOS类目	Ecology ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215147
作者单位	1.Virginia Tech, Dept Biol Syst Engn, Blacksburg, VA 24061 USA; 2.South Florida Water Management Dist, W Palm Beach, FL 33406 USA
推荐引用方式 GB/T 7714	Sridhar, Venkataramana,Billah, Mirza M.,Valayamkunnath, Prasanth. Field-scale intercomparison analysis of ecosystems in partitioning surface energy balance components in a semi-arid environment[J],2019,19(1):24-37.
APA	Sridhar, Venkataramana,Billah, Mirza M.,&Valayamkunnath, Prasanth.(2019).Field-scale intercomparison analysis of ecosystems in partitioning surface energy balance components in a semi-arid environment.ECOHYDROLOGY & HYDROBIOLOGY,19(1),24-37.
MLA	Sridhar, Venkataramana,et al."Field-scale intercomparison analysis of ecosystems in partitioning surface energy balance components in a semi-arid environment".ECOHYDROLOGY & HYDROBIOLOGY 19.1(2019):24-37.