%0 Journal Article %A WANG Min %A YIN Yixing %A CHEN Xiaoyang %A GUO Yang %A XU Mei %A LUO Chuanjun %T Changing characteristics of meteorological drought in Tianjin for almost one century based on standardized precipitation evapotranspiration index %D 2022 %R 10.11755/j.issn.1006-7639(2022)-01-0011 %J Journal of Arid Meteorology %P 11-21 %V 40 %N 1 %X

Based on observation data of temperature and precipitation in Tianjin region during 1921-2016, the precipitation from the Global Precipitation Climatology Centre (GPCC-P) and the temperature from the Climate Research Unit (CRU-T) were evaluated and it was found that they performed well. On the basis of these results, the standardized precipitation evapotranspiration index (SPEI) was further used to analyze the temporal-spatial evolution characteristics of drought for almost a century in Tianjin region and its change trend in the future was estimated. The results are as follows: (1) Drought mainly occurred in the early 1940s, late 1990s and early 2000s, and it was dominated by mild drought and moderate drought in four seasons, and its high frequency season evolved from autumn, winter to spring and summer. (2) During six periods, climate tendency of SPEI showed “increasing and decreasing” in other seasons, but it showed “increasing, decreasing and increasing” in autumn, moreover the decreasing tendency in summer was most significant with a climate tendency of -0.3 per decade at Ninghe station during 1961-2010. (3) During 1921-1970, 1931-1980, 1941-1990, it was found that precipitation was dominating factor for the wet tendency in spring and winter, while temperature and precipitation were factors in summer and autumn; during 1951-2000, 1961-2010, 1971-2016, drought tendency in spring was affected mainly by temperature, in summer and winter it was synergistically affected by temperature and precipitation. (4) There was a negative correlation between SPEI and PDO in four seasons during 1921-2016 in Tianjin region, the correlation in spring and summer decreased from northwest to southeast, while that decreased from southeast to northwest in autumn and winter. (5) In the future, it will present drought trendency in summer in the whole region and in winter in the southwestern region, while drought trendency in spring and wet trendency in autumn will not significant.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2022)-01-0011