DOI: 10.5194/hess-24-793-2020
论文题名: Terrestrial water loss at night: Global relevance from observations and climate models
作者: Padrón R.S. ; Gudmundsson L. ; Michel D. ; Seneviratne S.I.
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2020
卷: 24, 期: 2 语种: 英语
Scopus关键词: Evapotranspiration
; Heat flux
; Soil moisture
; Wind
; Eddy covariance measurements
; Global climate model
; Long-wave radiation
; Model ensembles
; Mountain forests
; Nocturnal transpiration
; Vapor pressure deficit
; Windy conditions
; Climate models
; climate modeling
; evapotranspiration
; global climate
; global perspective
; hydrological cycle
; latent heat flux
; longwave radiation
; solar radiation
英文摘要: Nocturnal water loss (NWL) from the surface into the atmosphere is often overlooked because of the absence of solar radiation to drive evapotranspiration and the measuring difficulties involved. However, growing evidence suggests that NWL-and particularly nocturnal transpiration-represents a considerable fraction of the daily values. Here we provide a global overview of the characteristics of NWL based on latent heat flux estimates from the FLUXNET2015 dataset, as well as from simulations of global climate models. Eddy-covariance measurements at 99 sites indicate that NWL represents 6.3% of total evapotranspiration on average. There are six sites where NWL is higher than 15%; these sites comprise mountain forests with considerable NWL during winter that is related to snowy and windy conditions. Higher temperature, vapor pressure deficit, wind speed, soil moisture, and downward longwave radiation are related to higher NWL, although this is not consistent across all of the sites. On the other hand, the global multi-model mean of terrestrial NWL is 7.9% of the total evapotranspiration. The spread of the model ensemble, however, is greater than 15.8% over half of the land grid cells. Finally, NWL is projected to increase everywhere with an average of 1.8%, although with a substantial inter-model spread. Changes in NWL contribute substantially to projected changes in total evapotranspiration. Overall, this study highlights the relevance of water loss during the night and opens avenues to explore its influence on the water cycle and the climate system under present and future conditions. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159213
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Institute for Atmospheric and Climate Science, Department of Environmental Systems Science, ETH Zurich, Zurich, 8092, Switzerland
Recommended Citation:
Padrón R.S.,Gudmundsson L.,Michel D.,et al. Terrestrial water loss at night: Global relevance from observations and climate models[J]. Hydrology and Earth System Sciences,2020-01-01,24(2)