DOI: 10.5194/hess-20-4237-2016
Scopus记录号: 2-s2.0-84992378738
论文题名: Canopy-scale biophysical controls of transpiration and evaporation in the Amazon Basin
作者: Mallick K ; , Trebs I ; , Boegh E ; , Giustarini L ; , Schlerf M ; , Drewry D ; T ; , Hoffmann L ; , Von Randow C ; , Kruijt B ; , Araùjo A ; , Saleska S ; , Ehleringer J ; R ; , Domingues T ; F ; , Ometto J ; P ; H ; B ; , Nobre A ; D ; , Luiz Leal De Moraes O ; , Hayek M ; , William Munger J ; , Wofsy S ; C
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 10 起始页码: 4237
结束页码: 4264
语种: 英语
Scopus关键词: Agriculture
; Atmospheric radiation
; Atmospheric temperature
; Biophysics
; Climate change
; Climate models
; Drought
; Evaporation
; Heat flux
; Moisture
; Radiometry
; Soil moisture
; Soils
; Surface measurement
; Water management
; Water resources
; Aerodynamic conductances
; Large-Scale Biosphere-Atmosphere Experiments
; Physically based modeling
; Radiometric surface temperatures
; Soil water availability
; Surface radiometric temperatures
; Vapor pressure deficit
; Waterresource management
; Transpiration
; air-soil interaction
; biome
; climate change
; climate modeling
; eddy covariance
; evapotranspiration
; global climate
; land surface
; net radiation
; Penman-Monteith equation
; rainforest
; resource management
; soil moisture
; soil water
; vapor pressure
; water availability
; water resource
; Amazon Basin
英文摘要: Canopy and aerodynamic conductances (gC and gA) are two of the key land surface biophysical variables that control the land surface response of land surface schemes in climate models. Their representation is crucial for predicting transpiration (λET) and evaporation (λEE) flux components of the terrestrial latent heat flux (λE), which has important implications for global climate change and water resource management. By physical integration of radiometric surface temperature (TR) into an integrated framework of the Penman-Monteith and Shuttleworth-Wallace models, we present a novel approach to directly quantify the canopy-scale biophysical controls on λET and λEE over multiple plant functional types (PFTs) in the Amazon Basin. Combining data from six LBA (Large-scale Biosphere-Atmosphere Experiment in Amazonia) eddy covariance tower sites and a TR-driven physically based modeling approach, we identified the canopy-scale feedback-response mechanism between gC, λET, and atmospheric vapor pressure deficit (DA), without using any leaf-scale empirical parameterizations for the modeling. The TR-based model shows minor biophysical control on λET during the wet (rainy) seasons where λET becomes predominantly radiation driven and net radiation (RN) determines 75 to 80% of the variances of λET. However, biophysical control on λET is dramatically increased during the dry seasons, and particularly the 2005 drought year, explaining 50 to 65% of the variances of λET, and indicates λET to be substantially soil moisture driven during the rainfall deficit phase. Despite substantial differences in gA between forests and pastures, very similar canopy-atmosphere "coupling" was found in these two biomes due to soil moisture-induced decrease in gC in the pasture. This revealed the pragmatic aspect of the TR-driven model behavior that exhibits a high sensitivity of gC to per unit change in wetness as opposed to gA that is marginally sensitive to surface wetness variability. Our results reveal the occurrence of a significant hysteresis between λET and gC during the dry season for the pasture sites, which is attributed to relatively low soil water availability as compared to the rainforests, likely due to differences in rooting depth between the two systems. Evaporation was significantly influenced by gA for all the PFTs and across all wetness conditions. Our analytical framework logically captures the responses of gC and gA to changes in atmospheric radiation, DA, and surface radiometric temperature, and thus appears to be promising for the improvement of existing land-surface-atmosphere exchange parameterizations across a range of spatial scales. © 2016 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78705
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Environmental Research and Innovation, Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg; Department of Science and Environment, Roskilde University, Roskilde, Denmark; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, United States; Instituto Nacional de Pesquisas Espaciais (INPE), Centro de Ciência Do Sistema Terrestre, Saõ José dos Campos, SP, Brazil; Wageningen Environmental Research (ALTERRA), Wageningen, Netherlands; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), Belém, PA, Brazil; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States; Department of Biology, University of Utah, Salt Lake City, UT, United States; Faculdade de Filosofia Ciências e Letras de Ribeiraõ Preto, Universidade de Saõ Paulo (USP), Saõ Paulo, SP, Brazil; Centro Nacional de Monitoramento e Alertas de Desastres Naturais, Saõ Paulo, SP, Brazil; Department of Earth and Planetary Science, Harvard University, Cambridge, MA, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, United States
Recommended Citation:
Mallick K,, Trebs I,, Boegh E,et al. Canopy-scale biophysical controls of transpiration and evaporation in the Amazon Basin[J]. Hydrology and Earth System Sciences,2016-01-01,20(10)