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气候变化与植被对水文过程影响研究在HESS发表

已有 1919 次阅读 2018-7-27 08:45 |系统分类:论文交流

 

Abstract. The partitioning of precipitation into runoff (R)

and evapotranspiration (E), governed by the controlling parameter

in the Budyko framework (i.e., n parameter in the

Choudhury and Yang equation), is critical to assessing the

water balance at global scale. It is widely acknowledged that

the spatial variation in this controlling parameter is affected

by landscape characteristics, but characterizing its temporal

variation remains yet to be done. Considering effective precipitation

(Pe), the Budyko framework was extended to the

annual water balance analysis. To reflect the mismatch between

water supply (precipitation, P) and energy (potential

evapotranspiration, E0), we proposed a climate seasonality

and asynchrony index (SAI) in terms of both phase and amplitude

mismatch between P and E0. Considering streamflow

changes in 26 large river basins as a case study, SAI

was found to the key factor explaining 51% of the annual

variance of parameter n. Furthermore, the vegetation dynamics

(M) remarkably impacted the temporal variation in n,

explaining 67% of the variance. With SAI and M, a semiempirical

formula for parameter n was developed at the annual

scale to describe annual runoff (R) and evapotranspiration

(E). The impacts of climate variability (Pe, E0 and SAI)

and M on R and E changes were then quantified. Results

showed that R and E changes were controlled mainly by the

Pe variations in most river basins over the globe, while SAI

acted as the controlling factor modifying R and E changes

in the East Asian subtropical monsoon zone. SAI, M and E0

have larger impacts on E than on R, whereas Pe has larger

impacts on R.


hess-22-4047-2018.pdf




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