| 摘要: |
| 用中科院大气所的IAP AGCM模式,对海温和季内北太平洋副热带高压异常活动进行控制性试验,得到:西太平洋副高异常对热带西太平洋、南海、孟加拉湾的海温异常有两个月的滞后响应,且西太平洋副高异常和东太平洋副高异常总是相伴出现的,后者出现要早些；当上述海区SST正(负)异常时,500hPa上来自东西两个方向的位势波在西太平洋汇集的位置要偏北(南),相应副高的位置也持续偏北(南),两者吻合很好；在上述海温异常作用下,当东亚高纬出现阻塞形势时,西太平洋位势波汇集的位置与阻高的位置关系密切,它对副高的持续异常活动作用尤为显着。 |
| 关键词: 副热带高压 海温异常 汇集波 数值摸拟 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金 |
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| THE NUMERICAL SIMULATION OF INTRASEASONAL ANOMALOUSLY ADVANCING AND RETREATING OF WESTERN PACIFIC SUBTROPICAL HIGH |
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Duan Meicheng,Yu Shihua
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The Airforce Meteorology Institute, NanJing, 211101
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| Abstract: |
| Using IAP-AGCM,controled numerical experiments on SST and east Asian circulation have been performed and some conclusions as given below are reached:the abnormality of subtropical high has two-month lag response to SSTA of the tropical western Pacific、the south China sea and the Bay of Bengal; The abnormality of western Pacific subtropical high and the abnormality of eastern Pacific subtropical high always exist simultaneously,but the latter begins before the former. When the SST of the sea area above anomalously decreases (increases),the location of two zonal geopotential waves assembling in subtropical western Pacific is more to the south (north),and further more, the subtropical high is anomalously more to the south (north)too.Under the action of the SSTA above,when blocking pattern over east Asia land area appears,the location of the assembling waves is related to the location of the blocking high.It acts clearly on the abnormality of the subtropical high. |
| Key words: Subtropical high SSTA Assembling geopotential waves Numerical simulation |
