Arid
DOI10.1016/j.agrformet.2017.08.025
Intercomparison of surface energy fluxes, soil moisture, and evapotranspiration from eddy covariance, large-aperture scintillometer, and modeling across three ecosystems in a semiarid climate
Valayamkunnath, Prasanth1; Sridhar, Venkataramana1; Zhao, Wenguang2; Allen, Richard G.2
通讯作者Sridhar, Venkataramana
来源期刊AGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
EISSN1873-2240
出版年2018
卷号248页码:22-47
英文摘要

A comprehensive seasonal and interannual energy partition and flux analyses were conducted to differentiate three ecosystems including sagebrush, cheatgrass, and lodgepole pine in the Snake River Plain of Idaho. The study used 3 years of eddy covariance (EC) and large aperture scintillometer (LAS) flux measurements to evaluate the bio-physical processes that control the surface energy partitioning. A comparison of sensible heat flux (SH) by EC (H-EC) and LAS (H-LAS) showed H-EC was slightly underestimated due to wind turbulence and energy balance closure issues. The Noah Land Surface Model (LSM) was configured with NCEP-NARR (NOAH(NARR) simulation) or meteorological observation from the EC tower (NOAH(Obs) simulation). NOAH(NARR) simulation showed significantly more RMSE compared to NOAH(Obs) due to biases in downwelling shortwave and longwave radiation and precipitation (P) in the NARR data. Higher leaf area index (LAI) and moderate stomatal resistance (R-S) of lodgepole pine resulted in increased evapotranspiration (ET) (472-535 mm/year) compared to cheatgrass (261 mm to 278 mm/year) and sagebrush (229-353 mm/year). The Budyko ET analysis showed that all the three sites are water deficient and the evaporative ratio was less for the lodgepole pine ecosystem (0.80) when compared to sagebrush (0.94) and cheatgrass (0.93). The residual (attributed to deep percolation and runoff) from the water budget was higher (15-16%) in the lodgepole pine compared to that of cheatgrass (2-5%) and sagebrush (2-9%). Our results indicate the field-scale distinguishing features of heterogeneous ecosystems in the semi-arid environment and emphasize the need for intercomparison of flux measurements for better understanding of energy budget partitioning and improving the accuracy of simulated fluxes.


英文关键词Surface fluxes Energy budget Multi-sensor Semi-arid climate
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000417659700003
WOS关键词SENSIBLE HEAT-FLUX ; LAND-SURFACE ; ETA-MODEL ; LAYER ; RESOLUTION ; BALANCE ; IMPLEMENTATION ; EVAPORATION ; IRRIGATION ; TURBULENCE
WOS类目Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/207304
作者单位1.Virginia Polytech Inst & State Univ, Dept Biol Syst Engn, Blacksburg, VA 24061 USA;
2.Univ Idaho, Kimberly R&E Ctr, Kimberly, ID 83341 USA
推荐引用方式
GB/T 7714
Valayamkunnath, Prasanth,Sridhar, Venkataramana,Zhao, Wenguang,et al. Intercomparison of surface energy fluxes, soil moisture, and evapotranspiration from eddy covariance, large-aperture scintillometer, and modeling across three ecosystems in a semiarid climate[J],2018,248:22-47.
APA Valayamkunnath, Prasanth,Sridhar, Venkataramana,Zhao, Wenguang,&Allen, Richard G..(2018).Intercomparison of surface energy fluxes, soil moisture, and evapotranspiration from eddy covariance, large-aperture scintillometer, and modeling across three ecosystems in a semiarid climate.AGRICULTURAL AND FOREST METEOROLOGY,248,22-47.
MLA Valayamkunnath, Prasanth,et al."Intercomparison of surface energy fluxes, soil moisture, and evapotranspiration from eddy covariance, large-aperture scintillometer, and modeling across three ecosystems in a semiarid climate".AGRICULTURAL AND FOREST METEOROLOGY 248(2018):22-47.
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