| 基于遥感蒸散量的我国干旱特征研究* |
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| 引用本文： | 李伟光,刘少军,韩静,陈小敏,佟金鹤.基于遥感蒸散量的我国干旱特征研究*[J].新疆气象,2021,15(3):93-99. |
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| 作者姓名： | 李伟光 刘少军 韩静 陈小敏 佟金鹤 |
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| 作者单位： | 海南省气象科学研究所,海南省气象科学研究所,海南省气象科学研究所,海南省气象科学研究所,海南省气象科学研究所 |
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| 摘 要： | 为掌握我国不同地区降水与蒸散平衡状况,深入理解干旱发生特征,使用MODIS反演的地表实际蒸散量与气象站点降水观测数据,对我国干旱特征进行了分析。结果表明,我国年平均蒸散量为530 mm,从华南的1 000 mm左右向西北、东北200～400 mm的区域递减。潜在蒸散南北、东西的空间分布差异程度小于实际蒸散。降水蒸散差与降水充沛月比例的时空分布相似,夏季,我国降水资源最为充沛,大部分地区降水蒸散差100 mm,降水充沛月比例普遍在80%以上;其他季节易发区域性干旱。春季,华北大部分、东北地区东南部降水蒸散差也为正值,但降水充沛月比例不足40%。秋季华南地区降水蒸散差-100 mm,比例40%。冬季,除东南部部分地区外,我国大部分地区降水蒸散差普遍为负值,降水充沛月比例20%。1961—1989年与1990—2018年降水充沛月比例对比发现,我国中部和西南部部分区域降水充沛月比例存在下降趋势,而北疆、东北和东南部局部地区存在上升趋势。
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| 收稿时间： | 2019/11/13 0:00:00 |
| 修稿时间： | 2020/4/14 0:00:00 |
Study on drought characteristics of China based on evapotranspiration of remote sensing |
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| LI Weiguang,LIU Shaojune,HAN Jing,CHEN Xiaomin and TONG Jinhe.Study on drought characteristics of China based on evapotranspiration of remote sensing[J].Bimonthly of Xinjiang Meteorology,2021,15(3):93-99. |
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| Authors: | LI Weiguang LIU Shaojune HAN Jing CHEN Xiaomin and TONG Jinhe |
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| Institution: | Institute of Hainan Meteorological science,Institute of Hainan Meteorological science,Institute of Hainan Meteorological science,Institute of Hainan Meteorological science,Institute of Hainan Meteorological science |
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| Abstract: | In order to grasp the balance of precipitation and evapotranspiration in different regions of China and deeply understand the characteristics of drought, the actual evapotranspiration on the surface and the observation data of precipitation at meteorological stations are analyzed by using MODIS inversion. It was found that the average annual evapotranspiration in China was 530 mm, decreasing from 1000mm in south China to 200-400mm in northwest and northeast China. The spatial distribution of potential evapotranspiration is smaller than that of actual evapotranspiration. The distribution of precipitation evapotranspiration difference is similar to the spatial and temporal distribution of precipitation abundant month guarantee rate. In summer, China has the most abundant precipitation resources. The precipitation evapotranspiration difference in most areas of China is more than 100mm, and the guarantee rate of precipitation abundant month is generally above 80%. In spring, the evapotranspiration difference of precipitation in southeastern China is generally greater than 100mm, and the guarantee rate is above 80%. The evapotranspiration difference of precipitation in most of north China and the southeast of northeast China is also positive, but the precipitation guarantee rate is less than 40%. In autumn, it is relatively humid in sichuan, chongqing and central China. The evapotranspiration difference of precipitation in south China is less than -100mm, and the guarantee rate is less than 40%. In winter, the evapotranspiration difference of precipitation is generally negative, and the monthly guarantee rate of precipitation is lower than 20%. Only the evapotranspiration difference of precipitation in jiangxi, hunan and some surrounding areas in the southeast of China is positive, and the monthly guarantee rate of abundant precipitation is generally above 60%. |
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| Keywords: | SEvaporation Water resources balance Drought characteristics MOD16 |
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