Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028658 |
Budyko‐Based Long‐term Water and Energy Balance Closure in Global Watersheds from Earth Observations | |
Akash Koppa; Sarfaraz Alam; Diego G. Miralles; Mekonnen Gebremichael | |
2021-04-14 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Earth observations offer potential pathways for accurately closing the water and energy balance of watersheds, a fundamental challenge in hydrology. However, previous attempts based on purely satellite‐based estimates have focused on closing the water and energy balances separately. They are hindered by the lack of estimates of key components, such as runoff. Here, we posit a novel approach based on Budyko's water and energy balance constraints. The approach is applied to quantify the degree of long‐term closure at the watershed scale, as well as its associated uncertainties, using an ensemble of global satellite datasets. We find large spatial variability across aridity, elevation, and other environmental gradients. Specifically, we find a positive correlation between elevation and closure uncertainty, as derived from the Budyko approach. In mountainous watersheds the uncertainty in closure is 3.9±0.7. Our results show that uncertainties in terrestrial evaporation contribute twice as much as precipitation uncertainties to errors in the closure of water and energy balance. Moreover, our results highlight the need for improving satellite‐based precipitation and evaporation data in humid temperate forests, where the closure error in the Budyko space is as high as 1.1±0.3, compared to only 0.2±0.03 in tropical forests. Comparing the results with land surface model‐based datasets driven by in‐situ precipitation, we find that earth observation‐based datasets perform better in regions where precipitation gauges are sparse. These findings have implications for improving the understanding of global hydrology and regional water management and can guide the development of satellite remote sensing‐based datasets and Earth system models. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/322805 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Akash Koppa,Sarfaraz Alam,Diego G. Miralles,等. Budyko‐Based Long‐term Water and Energy Balance Closure in Global Watersheds from Earth Observations[J]. Water Resources Research,2021. |
APA | Akash Koppa,Sarfaraz Alam,Diego G. Miralles,&Mekonnen Gebremichael.(2021).Budyko‐Based Long‐term Water and Energy Balance Closure in Global Watersheds from Earth Observations.Water Resources Research. |
MLA | Akash Koppa,et al."Budyko‐Based Long‐term Water and Energy Balance Closure in Global Watersheds from Earth Observations".Water Resources Research (2021). |
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