Scholarlink

<p>This study emphasizes the impact of the summer (June-August) tropical Atlantic (TA) sea surface temperature (SST) anomalies on the precipitation during the first rainy season (FRS, April-June) of the following year in South China without the influence of the El Niño/Southern Oscillation (ENSO). Correlation and causal analyses combined with atmospheric dynamic diagnostics reveal that summer TA SST anomalies enable the storage of anomalous signals by promoting the development of a tripole SST pattern in the North Atlantic (NA) during the subsequent FRS. Following a lower TA SST in the preceding summer, the NA tripole-like SST anomalies excite a Eurasian Rossby wave train and thus significantly strengthen the Ural Mountain ridge and the cyclonic circulation around Lake Baikal. On the one hand, this process induces the intensification and southward expansion of the subtropical westerly jet, leading to anomalous ascending motion over South China. On the other hand, it facilitates more frequent southward intrusions of mid-high latitude cold air, which enhances low-level frontogenetic forcing over South China. These coupled mechanisms ultimately amplify precipitation.</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

The relationship between summer tropical Atlantic sea surface temperature and the first rainy season precipitation in South China without ENSO impact

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月21日

查看全文
  • Hao Qin,
  • Xiaoli Luo,
  • Danlei Jian

摘要

This study emphasizes the impact of the summer (June-August) tropical Atlantic (TA) sea surface temperature (SST) anomalies on the precipitation during the first rainy season (FRS, April-June) of the following year in South China without the influence of the El Niño/Southern Oscillation (ENSO). Correlation and causal analyses combined with atmospheric dynamic diagnostics reveal that summer TA SST anomalies enable the storage of anomalous signals by promoting the development of a tripole SST pattern in the North Atlantic (NA) during the subsequent FRS. Following a lower TA SST in the preceding summer, the NA tripole-like SST anomalies excite a Eurasian Rossby wave train and thus significantly strengthen the Ural Mountain ridge and the cyclonic circulation around Lake Baikal. On the one hand, this process induces the intensification and southward expansion of the subtropical westerly jet, leading to anomalous ascending motion over South China. On the other hand, it facilitates more frequent southward intrusions of mid-high latitude cold air, which enhances low-level frontogenetic forcing over South China. These coupled mechanisms ultimately amplify precipitation.