Journal of Food, Agriculture and Environment

Assessing the impact of climate variability on potential evapotranspiration during the past 50 years in North China 

Author(s):

Jing Feng ^{1, 2, 3}, Denghua Yan ^{2, 3} *, Chuanzhe Li ^{2, 3, 4}, Shujun Bao ^{2, 3}, Yu Gao ^{1, 2 , 3}

Recieved Date: 2012-06-22, Accepted Date: 2012-10-08

Abstract:

Assessing the impact of climate factors on evapotranspiration is helpful in understanding the impact of climate change on hydrological processes. In this paper, based on the daily meteorological observation data of 93 weather stations from 1961 to 2010 within and around the North China, potential evapotranspiration (ET₀) was estimated with the FAO Penman-Monteith method. The temporal and spatial variations of ET₀ were analyzed by using ARCGIS and Mann-Kendall methods. Based on the standardized regression coefficients, multiple regression analysis was employed to attribute the effects of the variations to ET₀. The effects of climatic variables on the variation of ET₀ were finally determined by analyzing the trend and the sensitivity rate to ET₀. The results showed that average annual potential evapotranspiration of the whole North China is 1096.64 mm, and annual ET₀ showed an insignificantly decreasing trend, with significant temporal and spatial variability depending on different stations. In terms of sensitive factors to ET₀, the average daily temperature was detected with the most positive sensitivity of the value as 0.557. Moreover, the second most dominant factor was wind speed, with the value of 0.470, followed by relative humidity with the value of -0.338. Trend analysis of meteorological factors exhibited that the reduction in ET₀ was principally caused by signicant decrease in relative humidity. The increase of annual sunshine hour and wind speed produced much increase in ET₀ rates. The decrease of annual effective rainfall slightly reduced ET₀ rates. Furthermore, the combined effects demonstrated an overall negative ET₀ trend.

Keywords:

Potential evapotranspiration, trend analysis, climate variability, Penman-Monteith method, North China

---

Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1392-1398

---

Full text for Subscribers

---

Information:

Note to users

The requested document is freely available only to subscribers/registered users with an online subscription to the Journal of Food, Agriculture & Environment. If you have set up a personal subscription to this title please enter your user name and password. All abstracts are available for free.

Article purchasing

If you like to purchase this specific document such as article, review or this journal issue, contact us. Specify the title of the article or review, issue, number, volume and date of the publication. Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.

---

Purchase this Article:   20 Purchase PDF Order Reprints for 15

---

Share this article :