This research uses the 59th-70th national emergency early warning information release monthly report data of China to study the total number of emergency early warnings in 2021, the general situation of early warning ...This research uses the 59th-70th national emergency early warning information release monthly report data of China to study the total number of emergency early warnings in 2021, the general situation of early warning categories and regional distribution differences. The results show that: 1) there are 387,075 early warning information in China in 2021, and the early warning has obvious seasonality. 2) The issuance of early warnings is obviously related to the seasons, and the issuance of early warnings varies from month to month. The issuance of one kind of early warning can easily lead to the issuance of another kind of early warning, that is, the early warnings are closely related, and some specific disasters are easy to cause secondary disasters. 3) There are differences in the number of early warnings in each province. 4) The reason for the peak of early warnings in July and the large proportion of red early warnings in Henan Province is the sudden heavy rainstorm in Henan Province in July;the physical mechanism of this heavy rainstorm is sufficient water vapor, strong uplifting movement and stable situation and a long existence time.展开更多
The changes of winter surface air temperature(SAT)over the Tibetan Plateau(TP)effect the glacier extent and water resource supply and play a crucial role in climate prediction for the TP and East Asia.Utilizing the gr...The changes of winter surface air temperature(SAT)over the Tibetan Plateau(TP)effect the glacier extent and water resource supply and play a crucial role in climate prediction for the TP and East Asia.Utilizing the gridded dataset(CN05.1)provided by the China Meteorological Administration and atmospheric reanalysis dataset(ERA5),this paper explored the characteristics of winter SAT on the TP during the period of 1979–2020 and investigated the role of adiabatic heating.The results show that the warming of TP winter SAT is centered on the period of 1994–2005,while SATwarming is not significant during the other period.The further mechanism analysis denotes the adiabatic heating resulting from the significant strengthen of anticyclone over the TP and corresponding descending motion dominates the TP winter warming during the period of 1994–2005.The sea surface temperature(SST)in the North Atlantic Ocean might be a forcing source of winter dynamic circulation over the TP.The rapid increase of the North Atlantic Ocean SST during the period of 1994–2005 stimulates the southeastward propagating Rossby wave and the anticyclone anomaly over the TP,thus leading to the subsidence motion and adiabatic heating.展开更多
文摘This research uses the 59th-70th national emergency early warning information release monthly report data of China to study the total number of emergency early warnings in 2021, the general situation of early warning categories and regional distribution differences. The results show that: 1) there are 387,075 early warning information in China in 2021, and the early warning has obvious seasonality. 2) The issuance of early warnings is obviously related to the seasons, and the issuance of early warnings varies from month to month. The issuance of one kind of early warning can easily lead to the issuance of another kind of early warning, that is, the early warnings are closely related, and some specific disasters are easy to cause secondary disasters. 3) There are differences in the number of early warnings in each province. 4) The reason for the peak of early warnings in July and the large proportion of red early warnings in Henan Province is the sudden heavy rainstorm in Henan Province in July;the physical mechanism of this heavy rainstorm is sufficient water vapor, strong uplifting movement and stable situation and a long existence time.
基金supported by the National Key Research and Development Program of China(Grant No.2022YFF0801703)the National Natural Science Foundation of China(Grant No.42288101)。
文摘The changes of winter surface air temperature(SAT)over the Tibetan Plateau(TP)effect the glacier extent and water resource supply and play a crucial role in climate prediction for the TP and East Asia.Utilizing the gridded dataset(CN05.1)provided by the China Meteorological Administration and atmospheric reanalysis dataset(ERA5),this paper explored the characteristics of winter SAT on the TP during the period of 1979–2020 and investigated the role of adiabatic heating.The results show that the warming of TP winter SAT is centered on the period of 1994–2005,while SATwarming is not significant during the other period.The further mechanism analysis denotes the adiabatic heating resulting from the significant strengthen of anticyclone over the TP and corresponding descending motion dominates the TP winter warming during the period of 1994–2005.The sea surface temperature(SST)in the North Atlantic Ocean might be a forcing source of winter dynamic circulation over the TP.The rapid increase of the North Atlantic Ocean SST during the period of 1994–2005 stimulates the southeastward propagating Rossby wave and the anticyclone anomaly over the TP,thus leading to the subsidence motion and adiabatic heating.
