Characteristics of Zonal Propagation of Atmospheric Kinetic Energy at Equatorial Region in Asia

• Published in: Acta meteorologica Sinica Vol. 20; no. 1; pp. 86 - 94
• Main Author: 高辉 陈隆勋 何金海 陶诗言 金祖辉
• Format: Journal Article
• Language: English
• Published: Beijing Springer Nature B.V 2006; Laboratory for Climate Studies of China Meteorological Administration, National Climate Center, Beijing 100081%Chinese Academy of Meteorological Sciences, Beijing 100081%Department of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044%Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
• Subjects: Meteorological satellites; Meteorology; Ocean currents; Studies; 东亚; 动能; 大气科学; 季风; 赤道区; ISW, Somalia; ISW, Indian Ocean, Bengal Bay; ISEW, South China Sea; IW, Pacific; Asia; IS, Tropical Pacific; kinetic energy; East Asian monsoon system; Indian monsoon system; zonal propagation
• ISSN: 0894-0525; 2191-4788

Based on the daily NCEP/NCAR reanalysis dataset from 1980 to 1997, the zonal propagations of 850 hPa kinetic energy （KE） and meridional wind （v） at equatorial region are examined respectively. Results show that the strongest center of KE in the tropical Asian monsoon region is located at 75°-90°E, with the secondary over the Somalia low-level jet channel, i.e., about 50°E. East to 90°E, disturbances of both KE and v observed are mainly coming from the western Pacific Ocean and propagating westward to the Bay of Bengal （BOB） passing through the South China Sea. But the propagation directions of both KE and v are rather disorderly between the BOB and the Somalia jet channel. Therefore, the East Asian summer monsoon and the Indian summer monsoon are different in the propagating features of the disturbances of KE and v. Above facts indicate that East Asian monsoon system exists undoubtedly even at the equatorial region, and quite distinct from the Indian monsoon system, it is mainly affected by the disturbances coming from the tropical western Pacific rather than from the Indian monsoon region. The boundary of the two monsoon systems is around 95°-100°E, which is more westward than the counterpart as proposed in earlier studies by 5-10 degrees in longitude.