Scholarlink

<p>El Niño and La Niña events tend to induce opposite seasonal climate anomalies in the marginal seas of China especially during their mature phase-boreal winter. Our analysis, however, reveals that marine heatwaves (MHWs) occurred in the East China Sea with large and comparable mean intensity in El Niño and La Niña winters. This study investigates the reasons and processes of the formation of winter MHWs in the East China Sea. It is found that a key factor leading to sea surface temperature (SST) increase during the formation of MHWs is anomalous lower-level southerly winds over the marginal seas of China in both El Niño and La Niña winters. Those anomalous southerly winds reduce surface wind speed on one hand and sea-air humidity difference on the other hand, both of which suppress upward surface latent heat flux, contributing to ocean surface warming. The reason for anomalous southerly winds is different in El Niño and La Niña winters. In El Niño winters, anomalous southerly winds are attributed to (1) an anomalous anticyclone over the tropical western North Pacific induced by equatorial central-eastern Pacific warm SST anomalies and (2) anomalous ascent over the mid-latitude East Asia induced by weakened East Asian trough associated with a Eurasian wave train. In La Niña winters, anomalous southerly winds are attributed to (1) anomalous ascent over the mid-latitude East Asia induced by weakened East Asian trough and northward-shifted East Asian jet and (2) anomalous upper-level divergence over the mid-latitude East Asia induced by equatorial central-eastern Pacific cold SST anomalies.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Formation of marine heatwaves in the East China sea in El Niño and La Niña winters

  • 期刊论文

  • 发表日期：

    2025年6月9日

查看全文
  • Xiuming Li,
  • Renguang Wu,
  • Xiaojing Jia,
  • Wen-Jun Zhang

摘要

El Niño and La Niña events tend to induce opposite seasonal climate anomalies in the marginal seas of China especially during their mature phase-boreal winter. Our analysis, however, reveals that marine heatwaves (MHWs) occurred in the East China Sea with large and comparable mean intensity in El Niño and La Niña winters. This study investigates the reasons and processes of the formation of winter MHWs in the East China Sea. It is found that a key factor leading to sea surface temperature (SST) increase during the formation of MHWs is anomalous lower-level southerly winds over the marginal seas of China in both El Niño and La Niña winters. Those anomalous southerly winds reduce surface wind speed on one hand and sea-air humidity difference on the other hand, both of which suppress upward surface latent heat flux, contributing to ocean surface warming. The reason for anomalous southerly winds is different in El Niño and La Niña winters. In El Niño winters, anomalous southerly winds are attributed to (1) an anomalous anticyclone over the tropical western North Pacific induced by equatorial central-eastern Pacific warm SST anomalies and (2) anomalous ascent over the mid-latitude East Asia induced by weakened East Asian trough associated with a Eurasian wave train. In La Niña winters, anomalous southerly winds are attributed to (1) anomalous ascent over the mid-latitude East Asia induced by weakened East Asian trough and northward-shifted East Asian jet and (2) anomalous upper-level divergence over the mid-latitude East Asia induced by equatorial central-eastern Pacific cold SST anomalies.