地理学报 ›› 2010, Vol. 65 ›› Issue (7): 863-872.doi: 10.11821/xb201007010

• 水文水资源 • 上一篇    下一篇

广东蒸发皿蒸发量的变化特征及成因

范伶俐1,2, 郭品文1, 管勇3, 梁敏妍3   

  1. 1. 南京信息工程大学大气科学学院, 南京210044;
    2. 广东海洋大学海洋与气象学院, 广东湛江524088;
    3. 广东省江门市气象局, 广东江门529030
  • 收稿日期:2010-03-03 修回日期:2010-04-15 出版日期:2010-07-20 发布日期:2010-07-30
  • 作者简介:范伶俐(1971-), 女, 江西瑞昌人, 副教授, 博士研究生, 主要从事气候变化方面的研究。 E-mail: fanlingli@126.com
  • 基金资助:

    广东海洋大学自然科学基金项目(0812070)

Changes in Pan Evaporation and Its Cause over Guangdong

FAN Lingli1,2, GUO Pinwen1, GUAN Yong3, LIANG Minyan3   

  1. 1. College of Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China;
    2. College of Oceanography and Meteorology, Guangdong Ocean University, Zhanjiang 524088, Guangdong, China;
    3. Jiangmen Meteorological Office, Jiangmen 529030, Guangdong, China
  • Received:2010-03-03 Revised:2010-04-15 Online:2010-07-20 Published:2010-07-30
  • Supported by:

    Natural Science Foundation of Guangdong Ocean University, No.0812070

摘要:

利用广东86 个气象站1961-2008 年20 cm口径蒸发皿的实测资料,分析了广东小型蒸发皿蒸发量的变化趋势及其原因。结果表明,尽管在这48 年间广东年平均气温以0.21 oC/10a 的趋势递增,但是蒸发皿蒸发量总体上却以-54.67 mm/(10a) 的速度递减。蒸发皿蒸发量上升的地区只集中在粤中部分地区,下降幅度最大的地区则在粤西南、粤东沿海和珠江三角洲。通过对彭曼公式中能量平衡项和空气动力项的分析表明,粤中蒸发皿蒸发量的上升主要是因为供蒸发的动力上升幅度略大于能量下降幅度,而蒸发皿蒸发量的下降主要是供蒸发的能量和动力共同下降(或能量下降幅度远大于动力上升幅度) 所致。对各气象因子的趋势分析和相关分析表明,影响广东蒸发量的主要因子为日照时数和风速。

关键词: 广东, 蒸发皿蒸发量变化, 彭曼公式, 能量项, 空气动力项

Abstract:

The observation data of 20 cm caliber evaporation pan and related meteorological elements were collected from 86 weather stations of Guangdong for 1961-2008. Statistical analysis shows that the pan evaporation in Guangdong as a whole has continuously decreased at a rate of 54.67 mm per decade, although the annual mean temperature has increased at a rate of 0.21 oC per decade. The regions with a significant drop in pan evaporation are the Pearl River Delta, as well as southwestern and eastern coastal regions of Guangdong. Only a small part of regions with a rise in pan evaporation is located in the central region of Guangdong. Through analysis of variations of the dynamic term and energy term in Penman equation, separately, it is found that the drop of pan evaporation is mainly attributed to decreases in the energy term, and that the dynamic term in the southwestern and eastern coastal regions of Guangdong is mainly attributed to decreases in the energy term in the Pearl River delta. The rise of pan evaporation is mainly due to the fact that the increase in the dynamic term is greater than the decrease in the energy term. Further investigation into tendencies of meteorological impacting factors and the correlation analysis between pan evaporation and the influencing factors show that the sunshine duration and wind peed are remarkable.

Key words: Guangdong, pan evaporation, Penman equation, energy term, aerodynamic term