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10² to 10³ year scale variability of the El Niño/Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) in the eastern Indian Ocean over the last 30,000 years

过去30,000年东印度洋厄尔尼诺/南方涛动（ENSO）和印度洋偶极子（IOD）的10²至10³年尺度变化

基本信息

批准号：
136724195
负责人：
Professor Dr. Dierk Hebbeln
金额：
--
依托单位：
Zentrum für Marine Umweltwissenschaften (MARUM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/136724195?language=en
关键词：
10 year scale variability El

项目摘要

Recent studies agree that the Indonesian Archipelago plays a key role in present and past global climate. However, both proxy-based and modelling results differ when reconstructing the regional climate and its global implications, particularly on centennial to millennial timescales and during abrupt climate changes. These studies underline the need for hitherto missing high-resolution proxy evidence from the eastern Indian Ocean W and SW of the Indonesian Archipelago, a key region in tropical climate dynamics especially with regard to the Indian Ocean Dipole (IOD) and El Niño-Southern Oscillation (ENSO). Using planktonic foraminifera-based geochemical proxies in high-resolution sediment cores from off W- and SW-Indonesia, we aim to reconstruct past variations in the regional hydrography that is strongly affected by IOD/ENSO events. We will interpret these results in order to reconstruct past intensity of the IOD and its link to ENSO on the above mentioned time-scales. Despite recent progress in understanding the inter-annual aspects of ENSO and IOD, the basic characteristics of their long-term operation and their link to global climate are so far elusive. Our study will provide clues on the long-term behavior of these phenomena under different climate states and boundary conditions.

最近的研究一致认为，印度尼西亚群岛在当前和过去的全球气候中发挥着关键作用。然而，在重建区域气候及其全球影响时，特别是在百年到千年的时间尺度以及气候突变期间，基于代理的结果和建模结果都不同。这些研究强调需要从印度尼西亚群岛东印度洋西部和西南部获取迄今为止缺失的高分辨率代理证据，这是热带气候动力学的关键区域，特别是在印度洋偶极子（IOD）和厄尔尼诺南方涛动（ENSO）方面。我们利用来自印度尼西亚西部和西南部的高分辨率沉积岩芯中基于浮游有孔虫的地球化学代理，旨在重建受 IOD/ENSO 事件强烈影响的区域水文学的过去变化。我们将解释这些结果，以便在上述时间尺度上重建 IOD 的过去强度及其与 ENSO 的联系。尽管最近在了解 ENSO 和 IOD 的年际变化方面取得了进展，但其长期运行的基本特征及其与全球气候的联系迄今为止仍难以捉摸。我们的研究将为这些现象在不同气候状态和边界条件下的长期行为提供线索。