(1) 中国科学院烟台海岸带研究所

On the basis of observed daily temperature and precipitation data from 60 meteorological stations in the Circum-Bohai-Sea region from 1961 to 2017,which were provided by the National Climate Centre, China Meteorological Administration,the daily meteorological drought composite index (MCI) of each station was calculated, and the meteorological drought process of each station was statistically analyzed for the past 57 years. The spatial-temporal characteristics and hazard risk evaluation of meteorological drought were thoroughly investigated on a seasonal scale in the Circum-Bohai-Sea region. The results showed that both drought coverage area probability and drought duration decreased and drought intensity increased in spring during the period. However, in summer and autumn, both drought coverage area probability and drought duration increased,and drought intensity decreased. The probability of both drought coverage area and drought intensity increased and that of drought duration declined in winter over the study period. Comprehensively, the extent and influence of drought were the most severe in spring,followed by summer and autumn; the drought in winter was relatively slight in the Circum-Bohai-Sea region from 1961 to 2017. Spatially, high values for seasonal drought intensity and drought frequency were observed northwest of Liaoning Province, central and southern Hebei Province, and most parts of Shandong Province. However, low values for seasonal drought intensity and drought frequency were mainly detected in east of Liaoning Province. The distribution of drought hazard risks in all seasons generally presented a similar spatial pattern, west-high east-low and south-high north-low,in the study area. Specifically, the hazard risk of meteorological drought was generally high in central and south of Hebei Province, but low in east of Liaoning Province. Moreover, the hazard risk of meteorological drought was generally high in spring but low in winter. This study was performed to support the mitigation of drought hazard risks and improve the management of the ecological environment in the Circum-Bohai-Sea region.