| Seasonal Variation of the East Asian Subtropical Westerly Jet and Its Association with the Heating Field over East Asia |
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| 引用本文： | KUANG Xueyuan,ZHANG Yaocun. Seasonal Variation of the East Asian Subtropical Westerly Jet and Its Association with the Heating Field over East Asia[J]. 大气科学进展, 2005, 22(6): 831-840. DOI: 10.1007/BF02918683 |
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| 作者姓名： | KUANG Xueyuan ZHANG Yaocun |
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| 作者单位： | Department of Atmospheric Sciences, Nanjing University, Nanjing 210093 |
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| 摘 要： | The structure and seasonal variation of the East Asian Subtropical Westerly Jet （EAWJ） and associations with heating fields over East Asia are examined by using NCEP/NCAR reanalysis data. Obvious differences exist in the westerly jet intensity and location in different regions and seasons due to the ocean-land distribution and seasonal thermal contrast, as well as the dynamic and thermodynamic impacts of the Tibetan Plateau. In winter, the EAWJ center is situated over the western Pacific Ocean and the intensity is reduced gradually from east to west over the East Asian region. In summer, the EAWJ center is located over the north of the Tibetan Plateau and the jet intensity is reduced evidently compared with that in winter. The EAWJ seasonal evolution is characterized by the obvious longitudinal inconsistency of the northward migration and in-phase southward retreat of the EAWJ axis. A good correspondence between the seasonal variations of EAWJ and the meridional differences of air temperature （MDT） in the mid-upper troposphere demonstrates that the MDT is the basic reason for the seasonal variation of EAWJ. Correlation analyses indicate that the Kuroshio Current region to the south of Japan and the Tibetan Plateau are the key areas for the variations of the EAWJ intensities in winter and in summer, respectively. The strong sensible and latent heating in the Kuroshio Current region is closely related to the intensification of EAWJ in winter. In summer, strong sensible heating in the Tibetan Plateau corresponds to the EAWJ strengthening and southward shift, while the weak sensible heating in the Tibetan Plateau is consistent with the EAWJ weakening and northward migration.
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| 关 键 词： | 东亚地区 季节变化 热量交替 温度 风 |
| 收稿时间： | 2005-01-26 |
| 修稿时间： | 2005-04-15 |
Seasonal variation of the East Asian Subtropical Westerly Jet and its association with the heating field over East Asia |
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| Kuang Xueyuan,Zhang Yaocun. Seasonal variation of the East Asian Subtropical Westerly Jet and its association with the heating field over East Asia[J]. Advances in Atmospheric Sciences, 2005, 22(6): 831-840. DOI: 10.1007/BF02918683 |
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| Authors: | Kuang Xueyuan Zhang Yaocun |
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| Affiliation: | Department of Atmospheric Sciences, Nanjing University, Nanjing 210093,Department of Atmospheric Sciences, Nanjing University, Nanjing 210093 |
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| Abstract: | The structure and seasonal variation of the East Asian Subtropical Westerly Jet (EAWJ) and associations with heating fields over East Asia are examined by using NCEP/NCAR reanalysis data.Obvious differences exist in the westerly jet intensity and location in different regions and seasons due to the ocean-land distribution and seasonal thermal contrast, as well as the dynamic and thermodynamic impacts of the Tibetan Plateau. In winter, the EAWJ center is situated over the western Pacific Ocean and the intensity is reduced gradually from east to west over the East Asian region. In summer, the EAWJ center is located over the north of the Tibetan Plateau and the jet intensity is reduced evidently compared with that in winter. The EAWJ seasonal evolution is characterized by the obvious longitudinal inconsistency of the northward migration and in-phase southward retreat of the EAWJ axis. A good correspondence between the seasonal variations of EAWJ and the meridional differences of air temperature (MDT) in the mid-upper troposphere demonstrates that the MDT is the basic reason for the seasonal variation of EAWJ. Correlation analyses indicate that the Kuroshio Current region to the south of Japan and the Tibetan Plateau are the key areas for the variations of the EAWJ intensities in winter and in summer,respectively. The strong sensible and latent heating in the Kuroshio Current region is closely related to the intensification of EAWJ in winter. In summer, strong sensible heating in the Tibetan Plateau corresponds to the EAWJ strengthening and southward shift, while the weak sensible heating in the Tibetan Plateau is consistent with the EAWJ weakening and northward migration. |
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| Keywords: | East Asian subtropical westerly jet seasonal variation meridional difference of temperature heating fields over East Asia |
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