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Ice wedges as winter climate archives - towards high-quality chronologies, advanced process understanding and new paleoclimate records

冰楔作为冬季气候档案 - 实现高质量的年表、先进的过程理解和新的古气候记录

基本信息

批准号：
319593527
负责人：
Dr. Thomas Opel
金额：
--
依托单位：
Forschungsstelle Potsdam
依托单位国家：
德国
项目类别：
Research Fellowships
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/319593527?language=en
关键词：
Ice wedges winter climate archives

项目摘要

Ice wedges from Arctic permafrost regions are promising climate archives. In stable-water isotopes they preserve over millennia winter climate information that is not or only inadequately covered by other climate archives. This information,however, is essential for a comprehensive seasonal understanding of past climate variability.The proposed project aims at establishing ice wedges as climate archives and at providing new climate reconstructions. This will be achieved through a better understanding of the controlling processes and an advancement of methodical approaches. The project is based on an already existing set of ice-wedge data from several study sites in the Siberian Arctic and additional meteorological and isotope data.To derive better ice-wedge chronologies radiocarbon ages from different carbon fractions (macrofossil remains, dissolved, CO2) will be assessed and linked to local permafrost stratigraphies. Ice-wedge growth models will be developed to provide high-resolution ice-wedge isotope time series.The understanding of the ice-wedge isotope climate signal will be improved by the analysis of isotope fractionation during ice-wedge genesis. Considering local meteorological data ice-wedge isotope data will be calibrated to temperatures.By linking improved dating approaches and improved understanding of isotope signals new high-quality paleoclimate time series will be developed and interpreted considering other paleoclimate records and climate model output.

来自北极永久冻土区的冰楔是有希望的气候档案。在稳定水同位素中，它们保存了数千年来冬季的气候信息，这些信息没有被其他气候档案覆盖或覆盖不足。然而，这一信息对于全面了解过去气候变化的季节性是必不可少的，拟议的项目旨在建立冰楔作为气候档案，并提供新的气候重建。这将通过更好地理解控制过程和推进有条不紊的方法来实现。该项目基于西伯利亚北极地区几个研究地点现有的一组冰楔数据以及其他气象和同位素数据，为了更好地得出冰楔年代学，将评估不同碳组分（宏体化石残留物、溶解物、CO2）的放射性碳年龄，并将其与当地永久冻土层相联系。将建立冰楔生长模型，以提供高分辨率的冰楔同位素时间序列，通过分析冰楔形成过程中的同位素分馏，将提高对冰楔同位素气候信号的认识。考虑到当地的气象数据，冰楔同位素数据将根据温度进行校准，通过将改进的测年方法和对同位素信号的更好理解相结合，将开发新的高质量古气候时间序列，并考虑到其他古气候记录和气候模式输出进行解释。