ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 40 Issue 9 > 2014,40(9):1097-1105. DOI:10.7519/j.issn.1000-0526.2014.09.007 Prev Next
Study on Characteristics of Regional Drought Events over North China During the Past 50 Years
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Abstract:
The objective identification technique for regional extreme events (OITREE) is applied to detect the North China regional meteorological drought events during 1961-2010. The parameter values of the OITREE method are determined, and the results show that the OITREE method has a good capability in identifying the regional droughts in North China. In the study, 100 events are identified, including 10 extreme events, 20 severe events, 40 moderate events and 30 slight events, in which the September 1998-May 1999 extreme drought in North China is the most serious meteorological drought event for the past 50 years. Further analysis reveals that the durations are generally between 17-120 d and the maximum impacted areas vary from 70×104 km2 to 105×104 km2. Meanwhile, the drought events have obvious seasonal features with two peaks of March to July and October to November in frequency. In regional distribution, the southern part of North China has the highest drought frequency and intensity, and strong (extreme and severe) North China regional meteorological drought events can be divided into six types, of which the whole North China type occurs more frequently. During the past 50 years, the North China regional drought events show an increase trend in both frequency and intensity, for which the main cause may be the obvious decrease of annual precipitation in this region, with the contribution of significant increase trend in temperature.
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