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干旱区科学  2016, Vol. 8 Issue (2): 172-183    DOI: 10.1007/s40333-015-0060-x
  学术论文 本期目录 | 过刊浏览 | 高级检索 |
Oasis cold island effect and its influence on air temperature: a case study of Tarim Basin, Northwest China
HAO Xingming*, LI Weihong
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
Oasis cold island effect and its influence on air temperature: a case study of Tarim Basin, Northwest China
HAO Xingming*, LI Weihong
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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摘要 Oasis effect can improve the regional climate and habitability of an arid region. In this study, we explored the cold island effects of oases distributed along the edge of Tarim Basin by analyzing the oasis cold island effect (OCIE) intensity, spatial-temporal variation of OCIE, factors influencing the OCIE and impacts of OCIE on air temperature using geographical statistics and GIS methods based on the MODIS land surface temperature, land use/cover change (LUCC) and observed air temperature data. Results showed that all the oases in the Tarim Basin exhibited cold island effects, with the OCIE intensity highest in summer (−9.08°C), followed by autumn (−4.24°C) and spring (−3.85°C). The total area of oasis cold island (OCI) and the comprehensive OCIE index showed the same seasonal change trend as the OCIE intensity. However, the changing trends in areas of OCI with strong, medium and weak OCIEs were inconsistent across different seasons. Farmland and water areas were found to be the key contributors that affected the OCIE, and the area and aggregation metrics of these two land use/cover types directly contributed to the OCIE. By contrast, natural vegetation, such as forest and grassland, almost had no contribution to the OCIE. Simulation of observed air temperature data showed that if farmland is replaced by forest or grassland in the oasis, the mean, maximum and minimum air temperatures will increase significantly. This heating effect will be higher in summer (reaching 1.14°C to 2.08°C) and lower in spring and autumn. Moreover, the heating effect of farmland being replaced by forest will be higher than that of farmland being replaced by grassland. These results can provide a basis for understanding the cold island effect of oases in arid regions.
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HAO Xingming
LI Weihong
关键词:  Astragalus caragana  Astragalus cyclophyllon  Astragalus podolobus  environmental factors  Maxent    
Abstract: Oasis effect can improve the regional climate and habitability of an arid region. In this study, we explored the cold island effects of oases distributed along the edge of Tarim Basin by analyzing the oasis cold island effect (OCIE) intensity, spatial-temporal variation of OCIE, factors influencing the OCIE and impacts of OCIE on air temperature using geographical statistics and GIS methods based on the MODIS land surface temperature, land use/cover change (LUCC) and observed air temperature data. Results showed that all the oases in the Tarim Basin exhibited cold island effects, with the OCIE intensity highest in summer (−9.08°C), followed by autumn (−4.24°C) and spring (−3.85°C). The total area of oasis cold island (OCI) and the comprehensive OCIE index showed the same seasonal change trend as the OCIE intensity. However, the changing trends in areas of OCI with strong, medium and weak OCIEs were inconsistent across different seasons. Farmland and water areas were found to be the key contributors that affected the OCIE, and the area and aggregation metrics of these two land use/cover types directly contributed to the OCIE. By contrast, natural vegetation, such as forest and grassland, almost had no contribution to the OCIE. Simulation of observed air temperature data showed that if farmland is replaced by forest or grassland in the oasis, the mean, maximum and minimum air temperatures will increase significantly. This heating effect will be higher in summer (reaching 1.14°C to 2.08°C) and lower in spring and autumn. Moreover, the heating effect of farmland being replaced by forest will be higher than that of farmland being replaced by grassland. These results can provide a basis for understanding the cold island effect of oases in arid regions.
Key words:  Astragalus caragana    Astragalus cyclophyllon    Astragalus podolobus    environmental factors    Maxent
收稿日期:  2015-06-06      修回日期:  2015-09-16           出版日期:  2016-04-01      发布日期:  2015-10-09      期的出版日期:  2016-04-01
基金资助: 

This work was funded by the National Natural Science Foundation of China (41571109).

通讯作者:  HAO Xingming    E-mail:  haoxm@ms.xjb.ac.cn
引用本文:    
HAO Xingming, LI Weihong . Oasis cold island effect and its influence on air temperature: a case study of Tarim Basin, Northwest China[J]. 干旱区科学, 2016, 8(2): 172-183.
HAO Xingming, LI Weihong . Oasis cold island effect and its influence on air temperature: a case study of Tarim Basin, Northwest China. Journal of Arid Land, 2016, 8(2): 172-183.
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