SPATIO-TEMPORAL VARIATION OF ACTUAL EVAPOTRANSPIRATION AND ITS RELATION WITH CLIMATE PARAMETERS IN THE PEARL RIVER BASIN, CHINA

Spatio-temporal variation of actual evapotranspiration（ETa） in the Pearl River basin from 1961 to 2010 are analyzed based on daily data from 60 national observed stations. ETa is calculated by the Advection-Aridity model（AA model） in the current study, and Mann-Kendall test（MK） and Inverse Distance...

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Bibliographic Details
Published inJournal of Tropical Meteorology Vol. 23; no. 1; pp. 81 - 90
Main Author 吴萍 李修仓 苏布达 占明锦 王艳君 姜彤
Format Journal Article
LanguageEnglish
Published Guangzhou Guangzhou Institute of Tropical & Marine Meteorology 01.03.2017
Subjects
Advection
Aridity
Atmospheric pressure
Climate
Coastal zone
Correlation analysis
Daily temperature range
Daily temperatures
Duration
Evapotranspiration
Hydrologic cycle
Interpolation
Methods
Minimum temperatures
Parameters
Radiation
River basins
Rivers
Spatial variations
Spring
Studies
Sunlight
Sunshine duration
Temperature
Temperature effects
Temporal variations
Trends
Wind speed
Pearl River (China)
Online AccessGet full text
ISSN1006-8775
DOI10.16555/j.1006-8775.2017.01.008

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Summary:Spatio-temporal variation of actual evapotranspiration（ETa） in the Pearl River basin from 1961 to 2010 are analyzed based on daily data from 60 national observed stations. ETa is calculated by the Advection-Aridity model（AA model） in the current study, and Mann-Kendall test（MK） and Inverse Distance Weighted interpolation method（IDW）were applied to detect the trends and spatial variation pattern. The relations of ETa with climate parameters and radiation/dynamic terms are analyzed by Person correlation method. Our findings are shown as follows： 1） Mean annual ETa in the Pearl River basin is about 665.6 mm/a. It has significantly decreased in 1961-2010 at a rate of-24.3mm/10 a. Seasonally, negative trends of summer and autumn ETa are higher than that of spring and winter. 2） The value of ETa is higher in the southeast coastal area than in the northwest region of the Pearl River basin, while the latter has shown the strongest negative trend. 3） Negative trends of ETa in the Pearl River basin are most probably due to decreasing radiation term and increasing dynamic term. The decrease of the radiation term is related with declining diurnal temperature range and sunshine duration, and rising atmospheric pressure as well. The contribution of dynamic term comes from increasing average temperature, maximum and minimum temperatures in the basin. Meanwhile, the decreasing average wind speed weakens dynamic term and finally, to a certain extent, it slows down the negative trend of the ETa.
Bibliography:complementary relationship theory advection-aridity model actual evapotranspiration spatio-temporal variation Pearl River basin
WU Ping,2,3,LI Xiu-cang2,3,SU Bu-da2,3,4,ZHAN Ming-jin1,5,WANG Yan-jun2,JIANG Tong 2,3 （1. Chinese Academy of Meteorological Sciences, Beijing 100081 China; 2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science ＆ Technology, Nanjing, 210044 China; 3. National Climate Center, China Meteorological Administration, Beijing 100081 China; 4. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011 China; 5. Jiangxi Province Climate Center, Nanchang 330046 China）
44-1409/P
Spatio-temporal variation of actual evapotranspiration（ETa） in the Pearl River basin from 1961 to 2010 are analyzed based on daily data from 60 national observed stations. ETa is calculated by the Advection-Aridity model（AA model） in the current study, and Mann-Kendall test（MK） and Inverse Distance Weighted interpolation method（IDW）were applied to detect the trends and spatial variation pattern. The relations of ETa with climate parameters and radiation/dynamic terms are analyzed by Person correlation method. Our findings are shown as follows： 1） Mean annual ETa in the Pearl River basin is about 665.6 mm/a. It has significantly decreased in 1961-2010 at a rate of-24.3mm/10 a. Seasonally, negative trends of summer and autumn ETa are higher than that of spring and winter. 2） The value of ETa is higher in the southeast coastal area than in the northwest region of the Pearl River basin, while the latter has shown the strongest negative trend. 3） Negative trends of ETa in the Pearl River basin are most probably due to decreasing radiation term and increasing dynamic term. The decrease of the radiation term is related with declining diurnal temperature range and sunshine duration, and rising atmospheric pressure as well. The contribution of dynamic term comes from increasing average temperature, maximum and minimum temperatures in the basin. Meanwhile, the decreasing average wind speed weakens dynamic term and finally, to a certain extent, it slows down the negative trend of the ETa.
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ISSN:1006-8775
DOI:10.16555/j.1006-8775.2017.01.008