Scholarlink

<p>Determining whether both hemispheres warmed synchronously during the last deglaciation is important for identifying mechanisms for ice-age terminations. Here, we show that intermediate waters in the southwestern Pacific Ocean warmed simultaneously with some of the upper ocean waters in the Atlantic during Heinrich Stadial 1. In both regions, proxy records from benthic foraminifera show warming to interglacial temperatures beginning ~18,000 years ago and concluding by ~15,000 years ago. Our observations require a mechanism capable of producing rapid warming in these nearly antipodal ocean basins. We propose that some of the oceanic warming signal co-registered between these sites can be explained by a shift of the Southern Hemisphere Westerly Winds, which increased the temperature of intermediate water masses produced in the Southern Ocean. Taken together with results from Earth-system modeling experiments, we suggest that the Southern Hemisphere climate system played a role in regulating interhemispheric oceanic heat transport at millennial timescales.</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

Synchronous subsurface ocean warming in western boundary regions of both hemispheres during Heinrich Stadial 1

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月1日

查看全文
  • Cassandre R. Stirpe,
  • Katherine A. Allen,
  • Elisabeth L. Sikes,
  • Joellen L. Russell,
  • Aaron E. Putnam,
  • Thomas P. Guilderson

摘要

Determining whether both hemispheres warmed synchronously during the last deglaciation is important for identifying mechanisms for ice-age terminations. Here, we show that intermediate waters in the southwestern Pacific Ocean warmed simultaneously with some of the upper ocean waters in the Atlantic during Heinrich Stadial 1. In both regions, proxy records from benthic foraminifera show warming to interglacial temperatures beginning ~18,000 years ago and concluding by ~15,000 years ago. Our observations require a mechanism capable of producing rapid warming in these nearly antipodal ocean basins. We propose that some of the oceanic warming signal co-registered between these sites can be explained by a shift of the Southern Hemisphere Westerly Winds, which increased the temperature of intermediate water masses produced in the Southern Ocean. Taken together with results from Earth-system modeling experiments, we suggest that the Southern Hemisphere climate system played a role in regulating interhemispheric oceanic heat transport at millennial timescales.