| DOI: | 10.1016/j.scitotenv.2020.136719
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| 论文题名: | Satellite-based global-scale irrigation water use and its contemporary trends |
| 作者: | Zohaib M.; Choi M.
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| 刊名: | Science of the Total Environment
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| ISSN: | 489697
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| 出版年: | 2020
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| 卷: | 714 | | 语种: | 英语
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| 英文关键词: | Irrigation water use
; Land surface model
; Remote sensing
; Soil moisture
; Trend analysis
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| Scopus关键词: | Climate change
; Climate models
; Crops
; Remote sensing
; Rhenium compounds
; Satellites
; Soil moisture
; Space optics
; Surface measurement
; Uncertainty analysis
; Water supply
; Agriculture technology
; Food and agriculture organizations
; Irrigated agriculture
; Irrigation water use
; Land surface modeling
; Microwave remote sensing
; Trend analysis
; Water balance equation
; Irrigation
; accuracy assessment
; agricultural technology
; irrigation
; remote sensing
; satellite data
; soil moisture
; spatial resolution
; technological development
; trend analysis
; water use
; agricultural management
; Article
; climate change
; comparative study
; controlled study
; crop production
; geographic distribution
; global irrigation
; global map of irrigated area
; irrigation (agriculture)
; irrigation water use
; irrigation water withdrawal
; land use
; measurement accuracy
; microwave remote sensing
; priority journal
; rainy season
; remote sensing
; satellite based soil moisture
; soil moisture
; trend study
; validation study
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| 英文摘要: | Irrigated agriculture is important for satisfying the increasing world food demand, but it interrupts the natural hydrological cycle by applying additional water to crops. Accurate information regarding irrigation water use (IWU) is a prerequisite to exploit land surface modeling and to quantify the uncertainty of climate projections. In this study, the global IWU was estimated for 2000–2015 by combining satellite-based soil moisture (SM) observations from the European Space Agency's Climate Change Initiative (ESA CCI) and the model estimated SM from European ReAnalysis-5 (ERA5). Considering irrigation as an unmodeled hydrological process in ERA5 and the ability of ESA CCI SM to capture the irrigation patterns, the global IWU was estimated by solving the water balance equations for ESA CCI and ERA5 SM. Owing to the global absence of ground-truth data for IWU, the IWU estimates were compared with the reported irrigation water withdrawals (IWWs) provided by Food and Agriculture Organization. The results indicated that satellite-based SM observations have the potential to identify global irrigation. All three ESA CCI products (active, passive, and merged) discerned the global irrigated areas satisfactorily, and the estimated IWU captured the pattern of the country-level IWWs (R = 0.77, 0.72, and 0.81 for active, passive, and merged products, respectively). However, the estimated IWU substantially underestimated the reported IWWs (bias of −76.55, −76.01, and −73.93 km3 for active, passive, and merged products, respectively) due to the coarse spatial resolution (0.25° × 0.25°) of the microwave remote sensing products and the inclusion of supplemental water in the IWWs, which was lost during distribution to crops. Trend analysis of the IWU indicated an increasing trend of the IWU in the first decade of the 21st century. However, in recent years the trend has reversed due to advances in agriculture technology and the adoption of water-efficient irrigation methods. © 2020 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/158349
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| Appears in Collections: | 气候变化与战略
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作者单位: | Environment and Remote Sensing Laboratory, Graduate School of Water Resources, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, South Korea
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| Recommended Citation: | |
Zohaib M.,Choi M.. Satellite-based global-scale irrigation water use and its contemporary trends[J]. Science of the Total Environment,2020-01-01,714
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