Spatial and temporal variability of drought during 1960–2012 in Inner Mongolia, north China

Abstract In this study, drought in Inner Mongolia was studied by using standardized precipitation index (SPI) and dry spells (DS). Principal component analysis (PCA) was applied to the SPI series computed on 24-month time scale. The results demonstrate noticeable spatial patterns, with six sub-regions characterized by different climatic variability. Overall, most parts of Inner Mongolia are dominated by dry tendencies, except for the western and easternmost areas. Three DS indices, including the number of dry spells (NDS), mean length of dry spells (MDS) and maximum length of dry spells (MxDS), and four periods (spring, summer, autumn and winter), are considered. The results show that a predominant east to west increasing gradient for mean MDS and MxDS has been found in all periods. Mean NDS shows an opposite distribution to that of mean MDS and MxDS. Drought in the western area is more severe than in the eastern area. According to temporal analysis by using the Mann–Kendall trend method, summer is the only season showing strong trends for all the DS indices. During summer, the trends of MDS and MxDS dominantly are positive, while the trends of NDS are dominantly negative. This means that the summer droughts have become increasingly serious in Inner Mongolia.

[1]  E. Z. Başkent,et al.  Spatial dynamics of carbon storage: a case study from Turkey , 2013, Environmental Monitoring and Assessment.

[2]  C. Xue,et al.  Climate and crop yields impacted by ENSO episodes on the North China Plain: 1956–2006 , 2014, Regional Environmental Change.

[3]  L. Telesca,et al.  Power spectral characteristics of drought indices in the Ebro river basin at different temporal scales , 2013, Stochastic Environmental Research and Risk Assessment.

[4]  Jianhui Huang,et al.  Primary production and rain use efficiency across a precipitation gradient on the Mongolia Plateau. , 2008, Ecology.

[5]  N. Fohrer,et al.  Spatial patterns and temporal variability of dryness/wetness in the Yangtze River Basin, China , 2012 .

[6]  Isabella Bordi,et al.  Potential predictability of dry and wet periods: Sicily and Elbe-Basin (Germany) , 2004 .

[7]  Sergio M. Vicente-Serrano,et al.  Drought patterns in the Mediterranean area: the Valencia region (eastern Spain) , 2004 .

[8]  Hongbo Su,et al.  The changing pattern of droughts in the Lancang River Basin during 1960–2005 , 2012, Theoretical and Applied Climatology.

[9]  J. Wang,et al.  Trends of summer dry spells in China during the late twentieth century , 2005 .

[10]  Inmaculada Pulido-Calvo,et al.  Spatial and temporal variability of droughts in Portugal , 2010 .

[11]  Chong-Yu Xu,et al.  Observed changes of drought/wetness episodes in the Pearl River basin, China, using the standardized precipitation index and aridity index , 2009 .

[12]  F. Mannocchi,et al.  Analysis of drought in the region of Abruzzo (Central Italy) by the Standardized Precipitation Index , 2013, Theoretical and Applied Climatology.

[13]  Jun Xia,et al.  The spatial and temporal analysis of dry spells in the Yellow River basin, China , 2012, Stochastic Environmental Research and Risk Assessment.

[14]  Luis S. Pereira,et al.  Spatial Patterns and Temporal Variability of Drought in Western Iran , 2009 .

[15]  Ming Xu,et al.  Steady decline of east Asian monsoon winds, 1969–2000: Evidence from direct ground measurements of wind speed , 2006 .

[16]  Wang Huijun,et al.  The weakening of the Asian monsoon circulation after the end of 1970's , 2001 .

[17]  M. Gajić-Čapka,et al.  Spatial and temporal analysis of dry spells in Croatia , 2010 .

[18]  S. Erdogan,et al.  Spatial Analysis of Monthly and Annual Precipitation Trends in Turkey , 2012, Water Resources Management.

[19]  Shanlei Sun,et al.  Spatial and Temporal Variability of Precipitation and Dryness/Wetness During 1961–2008 in Sichuan Province, West China , 2014, Water Resources Management.

[20]  K. Tolika,et al.  Spatial and temporal characteristics of wet spells in Greece , 2005 .

[21]  Isabella Bordi,et al.  Spatio-temporal variability of dry and wet periods in eastern China , 2004 .

[22]  F. Liu,et al.  Spatial and temporal variability of water discharge in the Yellow River Basin over the past 60 years , 2012, Journal of Geographical Sciences.

[23]  Yuqing Wang,et al.  Observed trends in extreme precipitation events in China during 1961–2001 and the associated changes in large‐scale circulation , 2005 .

[24]  Yuqing Wang,et al.  Correction to “Observed trends in extreme precipitation events in China during 1961–2001 and the associated changes in large‐scale circulation” , 2005 .