DOI: | 10.1007/s11069-020-04080-y
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论文题名: | Global detection of aridification or increasing wetness in arid regions from 2001 to 2013 |
作者: | Kimura R.
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刊名: | Natural Hazards
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ISSN: | 0921030X
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出版年: | 2020
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卷: | 103, 期:2 | 起始页码: | 2261
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结束页码: | 2276
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语种: | 英语
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中文关键词: | Aridity index
; Desertification
; Drylands
; Land degradation
; Remote sensing
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英文关键词: | arid region
; aridification
; climate change
; evapotranspiration
; irrigation system
; rainfall
; rainfed agriculture
; transition zone
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英文摘要: | Arid regions are highly vulnerable to climate change and human activity, and global warming in particular has the potential to increase the arid land area. One traditional way to evaluate the extent of climate change in dryland regions is to use the aridity index (AI), defined as the ratio of annual rainfall to annual potential evapotranspiration. However, the AI is a climatic index; it does not represent actual conditions of aridity in arid regions. In contrast, the satellite-based aridity index (SbAI), which is based on day/night land surface temperature changes, is considered to represent actual conditions of moisture availability. Arid regions during 2001–2013 were classified at global scale by comparing the SbAI with the AI, that is, within Turc space, which is based on the water balance concept. In addition, factors contributing to aridification or wetness changes detected in different global regions were examined by comparing the SbAI and AI result with the yearly maximum normalized difference vegetation index and past land use. As a result, dryland regions were newly classified into five zones. In the stable zone, land areas were classified into hyper-arid, arid, semi-arid, or dry sub-humid regions by both the SbAI and the AI. Areas in the transition zone toward dryness are moderately dry. Areas in the transition zone toward wetness include large river basins, oases, and wadis with little rainfall. In the moist zone, rainfed or irrigated farming is being successfully conducted. Many parts of the dry zone, however, are extremely dry. © 2020, Springer Nature 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/168565
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Appears in Collections: | 气候变化与战略
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作者单位: | Arid Land Research Center, Tottori University, Tottori, 680-0001, Japan
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Recommended Citation: |
Kimura R.. Global detection of aridification or increasing wetness in arid regions from 2001 to 2013[J]. Natural Hazards,2020-01-01,103(2)
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