...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Sea ice feedback and Cenozoic evolution of Antarctic climate and ice sheets
【24h】

Sea ice feedback and Cenozoic evolution of Antarctic climate and ice sheets

机译：南极气候和冰盖的海冰反馈和新生代演化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The extent and thickness of Antarctic sea ice have important climatic effects on radiation balance, energy transfer between the atmosphere and ocean, and moisture availability. This paper explores the role of sea ice and related feedbacks in the Cenozoic evolution of Antarctic climate and ice sheets, using a numerical climate model with explicit, dynamical representations of sea ice and continental ice sheets. In a scenario of decreasing Cenozoic greenhouse gas concentrations, our model initiates continental glaciation before any significant sea ice forms around the continent. Once variable ice sheets are established, seasonal sea ice distribution is highly sensitive to orbital forcing and ice sheet geometry via the ice sheet's control on regional temperature and low-level winds. Although the expansion of sea ice has significant climatic effects near the coast, it has only minimal effects in the continental interior and on the size of the ice sheet. Therefore the Cenozoic appearance of Antarctic sea ice was primarily a response to the growth of grounded ice sheets and was not a critical factor in episodes of Paleogene and Neogene glaciation. The influence of the East Antarctic Ice Sheet on sea ice, Southern Ocean surface temperatures, and winds has important implications for ocean circulation, the marine carbon cycle, and the development of the West Antarctic Ice Sheet. The sensitivity of sea ice to grounded ice sheets implies reconstructions of sea ice based on marine diatoms are good indicators of glacial conditions in the continental interior and may provide insight into the long-term stability of Antarctic Ice Sheets.
机译：南极海冰的范围和厚度对辐射平衡，大气与海洋之间的能量转移以及水分的可获得性具有重要的气候影响。本文使用具有海冰和大陆冰盖显性，动态表示的数值气候模型，探索了海冰和相关反馈在南极气候和冰盖新生代演化中的作用。在新生代温室气体浓度降低的情况下，我们的模型在大陆周围任何重要的海冰形成之前就开始了大陆冰川作用。一旦建立了可变的冰盖，通过冰盖对区域温度和低风的控制，季节性海冰的分布对轨道强迫和冰盖的几何形状高度敏感。尽管海冰的膨胀在海岸附近具有显着的气候影响，但对大陆内部和冰盖的大小影响很小。因此，南极海冰的新生代外观主要是对地面冰盖生长的响应，而不是古近纪和新近纪冰川期的关键因素。东极南极冰原对海冰，南洋表面温度和风的影响对海洋环流，海洋碳循环和西极南极冰原的发展具有重要意义。海冰对地面冰盖的敏感性意味着基于海洋硅藻的海冰重建是大陆内部冰川状况的良好指标，并可能提供对南极冰盖长期稳定性的了解。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号