| DOI: | 10.1111/gcb.14577
|
| Scopus记录号: | 2-s2.0-85061959730
|
| 论文题名: | Determinants of the ratio of actual to potential evapotranspiration |
| 作者: | Peng L.; Zeng Z.; Wei Z.; Chen A.; Wood E.F.; Sheffield J.
|
| 刊名: | Global Change Biology
|
| ISSN: | 13541013
|
| 出版年: | 2019
|
| 卷: | 25, 期:4 | | 起始页码: | 1326
|
| 结束页码: | 1343
|
| 语种: | 英语
|
| 英文关键词: | aerodynamic conductance
; canopy height
; decoupling
; evapotranspiration
; leaf area index
; potential evapotranspiration
; surface conductance
|
| 英文摘要: | A widely used approach for estimating actual evapotranspiration (AET) in hydrological and earth system models is to constrain potential evapotranspiration (PET) with a single empirical stress factor (Ω = AET/PET). Ω represents the water availability and is fundamentally linked to canopy–atmosphere coupling. However, the mean and seasonal variability of Ω in the models have rarely been evaluated against observations, and the model performances for different climates and biomes remain unclear. In this study, we first derived the observed Ω from 28 FLUXNET sites over North America during 2000–2007, which was then used to evaluate Ω in six large-scale model-based datasets. Our results confirm the importance of incorporating canopy height in the formulation of aerodynamic conductance in the case of forests. Furthermore, leaf area index (LAI) is central to the prediction of Ω and can be quantitatively linked to the partitioning between transpiration and soil evaporation (R 2 = 0.43). The substantial differences between observed and model-based Ω in forests (range: 0.2~0.9) are highly related to the way these models estimated PET and the way they represented the responses of Ω to the environmental drivers, especially wind speed and LAI. This is the first assessment of Ω in models based on in situ observations. Our findings demonstrate that the observed Ω is useful for evaluating, validating, and optimizing the modeling of AET and thus of water and energy balances. © 2019 John Wiley & Sons Ltd |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/117454
|
| Appears in Collections: | 气候变化与战略
|
|
There are no files associated with this item.
|
| Recommended Citation: | |
Peng L.,Zeng Z.,Wei Z.,et al. Determinants of the ratio of actual to potential evapotranspiration[J]. Global Change Biology,2019-01-01,25(4)
|
|
|