Historical climate variation in the Maldives, Indian Ocean, based on proxy data from Scleractinian coral skeletons

马尔代夫和印度洋的历史气候变化，基于石珊瑚骨骼的代理数据

• 批准号: 22831518
• 负责人: Professor Dr. Eberhard Gischler
• 金额: --
• 依托单位: Arbeitsgruppe Biosedimentologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/22831518?language=en
• 关键词: Historical; climate; variation; Maldives; Indian

The goal of the proposed study is to reconstruct historical climate variability m the Maldives by analyzing the skeletons of massive corals with regard to growth rate and geochemical composition such as oxygen and carbon isotopes and trace elements of strontium and calcium. It is planned to sample at least 5 corals on Rasdhoo Atoll by drilling cores out of massive coral colonies such as Porites sp. and to reconstruct sea surface temperature variation over the last 100-200 years (1800-2000 AD) along the cores. In addition, carbon isotopes might provide information about illumination, nutrients, and anthropogenic CO2 emission in time. The data will help to better understand climate development in the northwestern Indian Ocean, which is strongly influenced by the monsoon and the El-Nino Southern Oscillation (ENSO). Knowledge of the development of these systems is of great socio-economic value because extreme deviations from the normal monsoon or ENSO climate variation may cause flooding, draughts, and even regional economic crises. The data will also allow to identify historical bleaching events in corals, that are caused by high temperatures, and possible cyclicity in these events might allow prediction of future bleachings. In addition, fossil corals from reef cores will be analyzed in order to obtain Holocene and possibly late Pleistocene climate proxy data.

拟议研究的目标是通过分析大规模珊瑚骨骼的生长速度和地球化学成分，如氧和碳同位素以及锶和钙的微量元素，重建马尔代夫历史上的气候变化。计划在Rasdhoo Atoll至少采集5种珊瑚样本，方法是从Porites sp.等大型珊瑚群中钻取岩心，并沿岩心重建过去100至200年（公元沿着）的海面温度变化。此外，碳同位素还可以及时提供有关光照、养分和人为CO2排放的信息。这些数据将有助于更好地了解印度洋西北部的气候发展，该地区受到季风和厄尔尼诺南方涛动（ENSO）的强烈影响。了解这些系统的发展具有重大的社会经济价值，因为与正常季风或厄尔尼诺/南方涛动气候变化的极端偏差可能导致洪水、干旱，甚至区域经济危机。这些数据还将有助于确定高温造成的珊瑚历史漂白事件，这些事件中可能的周期性可能有助于预测未来的漂白。此外，还将对珊瑚礁岩心的珊瑚化石进行分析，以获得全新世和可能的晚更新世气候代用数据。