淮河流域蒸发皿蒸发量变化分析

荣艳淑; 周云; 王文

淮河流域蒸发皿蒸发量变化分析

1.
河海大学水文水资源学院, 江苏, 南京, 210098;
2.
河海大学水文水资源与水利工程科学国家重点实验室, 江苏, 南京, 210098

基金项目: 国家自然科学基金资助项目(40771039;40830639;50879017)

详细信息

作者简介:
荣艳淑(1961- ),女,天津人,教授,博士,主要从事气候变化及水文气象研究.E-mail:ysron@hhu.edu.cn

中图分类号: P332.2

Analysis of pan evaporation changes in the Huaihe River basin

1.
College of Hydrology and Water Resource, Hohai University, Nanjing 210098, China;
2.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China

Funds: The study is financially supported by the National Natural Science Foundation of China (No.40771039;No.40830639;No.50879017).

摘要: 在气候变化背景下,许多地区蒸发皿蒸发量出现持续减少现象。淮河流域是中国南北方气候分界线,研究蒸发问题对认识淮河流域水分循环和水资源状况有重要作用。利用淮河流域实测蒸发皿蒸发量、气温、降水等7种气象要素、英国CRU月平均云量资料和NCEP/NCAR的再分析资料,分析了淮河流域近50年来蒸发皿蒸发量的变化及其原因。结果表明,淮河流域蒸发皿蒸发量存在显著的下降趋势。在一年的四季中,春夏季节蒸发量最大,下降趋势最强;淮河流域北部和西部蒸发量最大,下降趋势最强。究其原因,蒸发皿蒸发量下降与下垫面风速和日照时数减少、相对湿度和降水量增多有关;大气对流层相对湿度和比湿的增加致使地面相对湿度增大,天空云量和降水量增多,从而减弱了太阳辐射的强度,缩短了日照时间,结果使蒸发皿蒸发量下降。
- 蒸发皿蒸发量 /
- 线性趋势 /
- 气象要素 /
- 大气湿度 /
- 淮河流域
Abstract: Long-term observational records from the Huaihe River basin show that the evaporation rate from open pans of water has been steadily decreasing over the past 50 years.Traditionally,the Huaihe River valley is seen as the transition zone dividing the arid north from the tropical south in China.Due to its geographic location,studying of pan evaporation changes in the basin would be important to understanding the basin's water cycle and water resources conditions,especially in a changing climate.In this study,the pan evaporation change in the past 50 years is investigated using the observed pan evaporation,temperature,surface wind speed,sunshine duration,relative humidity,air pressure and rainfall from the China Meteorological Information Centre,as well as the monthly mean cloud amount data of UK Climatic Research Unit (CRU)and the NCEP/NCAR re-analysis data.The result confirms the pan evaporation in the basin has undergone a significant downward trend change over the past 50 years.The most pan evaporation occurs in springs and summers,and thus showing a strongest downward trend.Regionally,the greatest pan evapora-tion and the related downward trend change are found to be in the basin east and south.The study on the cause of decreased pan evaporation reveals that the downward trend change might be the result of the decreasing in surface wind speeds and sunshine duration,as well as the increasing in relative humidity and precipitation.The increase of both relative and specific humidity in the troposphere can result in an increase of surface relative humidity,cloud amount and precipitation,and thus weakening the intensity of solar radiation and shortening the sunshine duration.Such a process will eventually cause the reduction in pan evaporation.
- pan evaporation /
- linear time trend /
- meteorological elements /
- atmospheric humidity /
- Huaihe River basin

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淮河流域蒸发皿蒸发量变化分析

作者简介:
荣艳淑(1961- ),女,天津人,教授,博士,主要从事气候变化及水文气象研究.E-mail:ysron@hhu.edu.cn

Analysis of pan evaporation changes in the Huaihe River basin

计量

淮河流域蒸发皿蒸发量变化分析

1. 河海大学水文水资源学院, 江苏, 南京, 210098;

2. 河海大学水文水资源与水利工程科学国家重点实验室, 江苏, 南京, 210098

作者简介:
荣艳淑(1961- ),女,天津人,教授,博士,主要从事气候变化及水文气象研究.E-mail:ysron@hhu.edu.cn

English Abstract

Analysis of pan evaporation changes in the Huaihe River basin

1. College of Hydrology and Water Resource, Hohai University, Nanjing 210098, China;

2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China

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目录

留言板

淮河流域蒸发皿蒸发量变化分析

作者简介: 荣艳淑(1961- ),女,天津人,教授,博士,主要从事气候变化及水文气象研究.E-mail:ysron@hhu.edu.cn

Analysis of pan evaporation changes in the Huaihe River basin

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出版历程

淮河流域蒸发皿蒸发量变化分析

1. 河海大学水文水资源学院, 江苏, 南京, 210098; 2. 河海大学水文水资源与水利工程科学国家重点实验室, 江苏, 南京, 210098

作者简介: 荣艳淑(1961- ),女,天津人,教授,博士,主要从事气候变化及水文气象研究.E-mail:ysron@hhu.edu.cn

English Abstract

Analysis of pan evaporation changes in the Huaihe River basin

1. College of Hydrology and Water Resource, Hohai University, Nanjing 210098, China; 2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China

全文HTML

目录

作者简介:
荣艳淑(1961- ),女,天津人,教授,博士,主要从事气候变化及水文气象研究.E-mail:ysron@hhu.edu.cn

1. 河海大学水文水资源学院, 江苏, 南京, 210098;

2. 河海大学水文水资源与水利工程科学国家重点实验室, 江苏, 南京, 210098

作者简介:
荣艳淑(1961- ),女,天津人,教授,博士,主要从事气候变化及水文气象研究.E-mail:ysron@hhu.edu.cn

1. College of Hydrology and Water Resource, Hohai University, Nanjing 210098, China;

2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China