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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (10): 3480-3488.doi: 10.13287/j.1001-9332.202010.011

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Application of evaporative demand drought index (EDDI) in drought identification of Liaoning Province, China

LIU Dong-ming1,2, JI Rui-peng1,3*, CHEN Peng-shi2, ZHANG Wei-wei2, LI Jing2   

  1. 1Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China;
    2Ecological Meteorology and Satellite Remote Sensing Center of Liaoning Province, Shenyang 110166, China;
    3Liaoning Province Key Laboratory of Agrometeorological Disasters, Shenyang 110166, China
  • Received:2020-05-06 Accepted:2020-07-21 Online:2020-10-15 Published:2021-04-15
  • Contact: * E-mail: jiruipeng@163.com
  • Supported by:
    Open Fund Project of Institute of Atmospheric Environment, China Meteorological Administration and Liaoning Province Key Laboratory of Agrometeorological Disasters (2019SYIAE09), the Provincial Key R&D Project of Department of Science and Technology of Liaoning Province, China (2019JH2/10200018,2017210001), and the Climate Change Project of China Meteorological Administration (CCSF201910).

Abstract: The evaporative demand drought index (EDDI) is a multi-scale drought index developed from the atmospheric evaporation demand (E0). EDDI is independent of precipitation and suitable to different underlying surfaces, which can well capture water stress signals at different time scales. Based on the meteorological observation data at 52 stations in Liaoning Province from 1961 to 2018, we estimated daily E0, calculated EDDI at six time scales (annual, growing season, spring, summer, autumn and winter), and further identified the interannual variability of drought occurrence in Liaoning Province for the past 58 years. The results showed that EDDI had obvious interannual variation, with two high concentration periods in multiple time scales. In the 1960s, when there were many years and serious drought in Liaoning Province, high EDDI values were concentrated at the five time scales (annual, growing season, spring, autumn and winter). 2014-2018 was another relatively concentrated period of EDDI high value at all time scales except winter. In 1981-1982, the values of EDDI were high at the time scales of the annual, growth season, summer and autumn. The periods of 1963-1965 (except summer), 1972-1973 (growth season, summer), 1989-1990 (annual, growth season, spring and winter), 1997-1998 (annual, growth season and summer), 2004-2005 (spring and winter) and 2013-2014 (annual, growth season and autumn) occurred abrupt alternation from dry to wet or from wet to dry. In 1985-1987, 1993-1995 and 2005-2013, Liaoning Province had obvious dry gaps.

Key words: atmospheric evaporative demand, evaporative demand drought index (EDDI), drought, Liaoning Province