| 摘要: |
| 海洋在天气、气候及大气环流变化过程中起着重要作用,海洋热源的异常分布是造成长期天气异常的重要原因。海洋对大气的作用主要是通过海气界面的热量交换来实现的，因此,直接运用海气热量交换来考虑海洋对大气的加热作用,分析海洋加热异常对长期天气、气候及大气环流的影响,具有更明确的物理意义。
西北太平洋副热带高压是造成我国旱、涝及天气变化的主要副热带天气系统,对我国夏季气温、雨带位置及强度影响很大。西北太平洋中、低纬副热带地区是海洋向大气提供热量和水汽较多的地区,也是海气相互作用最强烈的海域,这一地区的海洋加热对西北太平洋副热带高压的变化将有直接影响。本文分析了冬季西北太平洋副热带海域海洋加热主要场的分布特征,指出了海洋加热与西北太平洋副热带高压的关系。结果表明,冬季该海域海洋加热较常年偏多时,冬、春至初夏副高偏弱,位置偏东、南(6月副高脊线位置除外);反之,海洋加热较常年偏少时,副高偏强,位置偏西、北(6月副高脊线位置除外)。该海域海洋加热对副热带地区大气环流,尤其是副热带高压环流的变化有着重要作用。本结果对预测西北太平洋副热带高压的变化,研究中纬度海洋加热对西北太平洋副热带高压及其大气环流的影响有十分重要的意义。 |
| 关键词: 副热带海域、海洋加热、副热带高压环流 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第2894号
国家自然科学基金资助项目，49646007号 |
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| CHARACTERISTICS OF THE HEATING ANOMALY OF THE NORTHWESTERN PACIFIC SUBTROPICAL AREA IN WINTER AND ITS EFFECTS ON THE SUBTROPICAL HIGH |
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Chen Yongli1, Zhao Yongping1, Wang Ailian2
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1.Institute of Oceanology,Chinese Academy of Sciences;2.Qingdao Regional Centre of Marine Enironmental Forcasting, SOA
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| Abstract: |
| Empirical orthogonal function analysis of the marine heating anomaly pattern over the Northwestern Pacific subtropical area in winter and the relationships between the first three patterns of the marine heating anomaly and the Subtropical High showed that the first component in winter was mainly characterised by large positive values in most areas, and had some effects on the Northwestern Pacific Subtropical High and that the lst component's time coefficients related closely to the Northwestern Pacific Subtropical High in winter, spring and the early summer. The more (less) the marine heating over the subtropical area was, the more the Subtropical High weakened (enhanced) and shifted southward (northward) and eastward (westward). |
| Key words: subtropical area,Subtropical High, marine heating |
