波包特征及高活跃区认识

Climatic features of baroclinic Rossby wave packets at 300 hPa in summers of 1979-2016 over Eurasia are investigated using the National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis and daily precipitation observations in China. It is found that the waves with zonal wavenumbers 5-7 are dominant in Northern Hemisphere. The meridional width (zonallength) of wave packets is up to 50lat, 130lon. The wave packets get strongerand incline a little northwestward from 850 up to 300 hPa. Most of strong wavepackets are observed around the Alps, the Black Sea and the Caspian Sea, and theypropagate eastward, or northeastward, or southeastward. Their zonal and meridionalpropagation velocities reach about 32 and 7 m/s, respectively. Interannual variations of June-July precipitation in different sub-regions of southern China are significantly affected by the baroclinic wave packet activities in different regions of Eurasia. These results have important implications for in-depth understanding wave behaviors and their climate impacts on southern China.

CHARACTERISTICS OF BAROCLINIC ROSSBY WAVE ACTIVITIES
Spatial distributions of occurrences of strongestwave packets

RELATIONSHIP BETWEEN ACTIVITIES OF BAROCLINIC WAVES AND PRECIPITATION IN CHINA

参考文献： Ye D, Guan Z, Jin D. Climatic features of summertime baroclinic wave packets over Eurasia and the associated possible impacts on precipitation in southern China. Atmos Sci Lett. 2019; 20:e889. https://doi.org/10.1002/asl.889.