Seasonality and interannual climate variability in the Caribbean during the last interglacial from coral records

珊瑚记录中末次间冰期加勒比地区的季节性和年际气候变化

• 批准号: 256607970
• 负责人: Dr. Thomas Felis
• 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: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/256607970?language=en
• 关键词: Seasonality; interannual; climate; variability; Caribbean

The last interglacial was slightly warmer than present. Thus, this period ~125,000 years ago has been suggested to serve as partial analogue for 1-2 °C global warming scenarios that consider no further increase in atmospheric greenhouse gas concentrations. The last interglacial is recent enough to obtain well-preserved and accurately dated climate records and offers a window to study the potential consequences of contemporary global warming. We suggest reconstructing the range of seasonality and interannual climate variability in the Caribbean during the last interglacial by analysing fossil corals from Bonaire. Sr/Ca and oxygen isotope ratios in coral skeletons will provide monthly resolved reconstructions of temperature and hydrologic balance at the sea surface for short time intervals, robustly resolving the annual cycle. Combined with climate model simulations performed by a collaborating group, we will identify forcing mechanisms of climate variability observed in the coral archives. Our approach will contribute to quantify the range of natural climate variability in the Caribbean during a period slightly warmer than today on timescales relevant for society.

最后的冰川间稍温暖。这一时期〜125，000年前被认为是1-2°C的全球变暖场景的部分类似物，认为大气温室气体浓度没有进一步增加。最近的最后一间冰期足以获得保存完好，准确的日期气候记录，并提供了一个研究当代全球变暖的潜在后果的窗口。我们建议通过分析Bonaire的化石珊瑚重建加勒比海中加勒比海中季节性和年际气候变化的范围。珊瑚骨骼中的SR/CA和氧同位素比将在短时间间隔内每月提供每月解决的温度和水平平衡的重建，从而稳健地解决年度周期。结合一个协作组进行的气候模型模拟，我们将确定在珊瑚档案中观察到的气候变异性机制。我们的方法将有助于量化加勒比海自然气候变异性的范围，而与今天相关的时间表略温暖。