With the 500-hPa geopotential height / SST fields and polar ice from NCEP/NCAR reanalysis source, the work discusses the relationship between abnormal motion of tropical cyclones making landfall on Guangdong province ...With the 500-hPa geopotential height / SST fields and polar ice from NCEP/NCAR reanalysis source, the work discusses the relationship between abnormal motion of tropical cyclones making landfall on Guangdong province and governing factors like general circulation, polar ice, SST and circulation indexes. It determines how the years of more or fewer tropical cyclones (TCs) distribute for the general circulation, polar ice, SST, conceptual models of all circulation indexes. The results show that (1) when the middle and higher latitudes of the Eurasian continent are mainly of meridional (zonal) circulation in autumn and winter, there are more (fewer) landfalls of TCs; (2) when the SST is warm (cold) in the equatorial eastern Pacific in January April, there are fewer (more) TCs landfall in the province in the current year but more (fewer) landfall the following year, indicating stable and obvious influence of the former on TCs; (3) when there are more (less) polar ice in summer, autumn and winter, or consistently more (less) ice in autumn and winter, there are mostly fewer (more) landfalls than usual.展开更多
文摘With the 500-hPa geopotential height / SST fields and polar ice from NCEP/NCAR reanalysis source, the work discusses the relationship between abnormal motion of tropical cyclones making landfall on Guangdong province and governing factors like general circulation, polar ice, SST and circulation indexes. It determines how the years of more or fewer tropical cyclones (TCs) distribute for the general circulation, polar ice, SST, conceptual models of all circulation indexes. The results show that (1) when the middle and higher latitudes of the Eurasian continent are mainly of meridional (zonal) circulation in autumn and winter, there are more (fewer) landfalls of TCs; (2) when the SST is warm (cold) in the equatorial eastern Pacific in January April, there are fewer (more) TCs landfall in the province in the current year but more (fewer) landfall the following year, indicating stable and obvious influence of the former on TCs; (3) when there are more (less) polar ice in summer, autumn and winter, or consistently more (less) ice in autumn and winter, there are mostly fewer (more) landfalls than usual.
