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首页> 外文期刊>International Journal of Climatology: A Journal of the Royal Meteorological Society >Variable correspondence between western North Pacific tropical cyclone frequency and East Asian subtropical jet stream during boreal summer: A tropical Pacific sea surface temperature perspective
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Variable correspondence between western North Pacific tropical cyclone frequency and East Asian subtropical jet stream during boreal summer: A tropical Pacific sea surface temperature perspective

机译：西北太平洋热带旋风频率与东亚亚热带射流之间的可变通信：热带太平洋海面温度透视

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摘要

Fluctuations in the summer relationship between western North Pacific tropical cyclone (TC) frequency (TCF) and East Asian subtropical jet stream (EAJS) are investigated using observations and composite analysis. Here TCF is divided into four categories to assess how different tropical Pacific sea surface temperature (SST) anomalies modulate TCF-EAJS associations. Results show that high TCF would weaken (strengthen) the south (north) part of EAJS, but with different locally poleward shifts during La Nina- and El Nino-like events. In contrast, during low TCF, a clearly southward shifted, strengthened EAJS occurs only when the western Pacific SST cools, but no significant change is observed when the western Pacific SST warms up. Further analysis shows that the possible reason why TCF has diverse linkages to EAJS is that the TC genesis locations and TC tracks are quite different under different tropical Pacific SST anomalies, even for quasi-constant TCF. Potential mechanisms responsible for the changing TCF-EAJS associations can be physically explained by the exceptional configurations of tropospheric meridional temperature gradient anomaly and the deformed-and-displaced Pacific-Japan-like wavetrain, which is mainly due to non-negligible differences in large-scale oceanic and atmospheric environments that modulate the TC genesis locations and TC tracks. This study highlights the importance of a tropical SST perspective when analysing TCF-EAJS associations.
机译：使用观测和复合分析研究了西北太平洋热带气旋（TC）频率（TCF）频率（TCF）和东亚亚热带射流（EAJS）之间的夏季关系的波动。这里TCF分为四类，以评估不同的热带太平洋海面温度（SST）异常调制TCF-EAJS关联。结果表明，高TCF将削弱（加强）EAJ的南部（北方）部分，但在La Ninon-和El Nino的事件中具有不同的当地局部偏移。相比之下，在低TCF期间，只有当西太平洋SST的冷却时，才会发生清晰的南方移位，加强的eAJ，但当西太平洋SST的热身时，没有观察到显着的变化。进一步的分析表明，TCF对EAJ的不同联系是TCF的可能性是，即使对于准恒定的TCF，TC Genesis位置和TC轨道也存在于不同的热带太平洋SST异化。负责变化的TCF-EAJS关联的潜在机制可以通过对流层子午线温度梯度异常和变形和流离失所的太平洋 - 日本类似的波浪引起的卓越配置来进行物理解释，这主要是由于大的不可忽略的差异 - 调节TC Genesis位置和TC轨道的尺寸海洋和大气环境。本研究强调了在分析TCF-EAJS关联时热带SST观点的重要性。

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