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Short-term climate dynamics and biogeochemical processes in the Gulf of Taranto: From regional proxy variations to climate records

塔兰托湾的短期气候动态和生物地球化学过程：从区域代理变化到气候记录

基本信息

批准号：
277062846
负责人：
Professor Dr. Kay-Christian Emeis
金额：
--
依托单位：
Max-Planck-Institut für Meteorologie (MPI-M)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/277062846?language=en
关键词：
Short term climate dynamics biogeochemical

项目摘要

The overall goal of the proposed project is to reconstruct records of climate and related biogeochemical cycles in the Gulf of Taranto (southern Italy) for the past few centuries and the late Holocene. We expect that these records will not only yield local information but will also record the effect of large-scale climate modes like the North Atlantic Oscillation. This goal necessitates the development of novel transfer functions to derive environmental information from sediment archives. Traditionally, transfer functions are defined by evaluating the relationships between proxy data and environmental parameters in the spatial domain. Here, we propose an alternative approach, in which we derive a transfer function that examines both the variability of the spatial and temporal domains, thus being a more direct approach to the reconstruction of temporal climate variations from proxy records. In order to achieve our goal, we will apply a high-resolution physical and biogeochemical ocean model for the period 1958-2013, including simulations of synthetic sediment cores with the targeted proxy variables. For this time period, high-quality reanalysis data are available to force the model. The modeled time series will be then compared with high-resolution proxy records generated from available surface sediments and sediment cores. The Gulf of Taranto is an ideal region for this research because the marine environments are closely linked to climate changes on land and sediments accumulate in deposition centers at high rates permitting the reconstruction of environmental variability at a sub-decadal resolution. Our new spatio-temporal transfer function will then be applied for the reconstruction of the regional climate and biogeochemical variability for the instrumental period (since at least 1850, individual records even longer), which allows an assessment of the quality of the reconstruction. Subsequently, we will extend the reconstruction to the full length of the available proxy records (approximately 5000 years). We plan to study the sensitivity of Mediterranean marine environments to large-scale climate patterns of the Northern hemisphere such as the North Atlantic Oscillation and the Atlantic Multidecadal Oscillation during the late Holocene. Additionally, the anthropogenic contribution to the changes found in the proxy records will be quantified.

拟议项目的总体目标是重建塔兰托湾（意大利南部）过去几个世纪和全新世晚期的气候和相关地球化学循环记录。我们希望这些记录不仅能提供当地的信息，还能记录像北大西洋涛动这样的大尺度气候模式的影响。这一目标需要开发新的传递函数，从沉积物档案中获取环境信息。传统上，传递函数是通过评估空间域中代理数据与环境参数之间的关系来定义的。在这里，我们提出了一种替代方法，在该方法中，我们得到一个传递函数，检查的空间和时间域的变化，从而成为一个更直接的方法来重建的时间气候变化的代理记录。为了实现我们的目标，我们将应用1958-2013年期间的高分辨率物理和地球化学海洋模型，包括模拟具有目标代理变量的合成沉积物岩心。在这段时间内，高质量的再分析数据可用于强制模型。然后将模拟的时间序列与从现有表层沉积物和沉积物岩心生成的高分辨率代用记录进行比较。塔兰托湾是这项研究的理想区域，因为海洋环境与陆地上的气候变化密切相关，沉积物在沉积中心以很高的速度积累，从而可以在亚十年分辨率上重建环境变化。我们的新的时空转换函数，然后将被应用于重建的区域气候和地球化学变化的仪器期间（至少自1850年以来，个人记录甚至更长），这使得重建的质量进行评估。随后，我们将扩展重建到可用代理记录的完整长度（约5000年）。我们计划研究地中海海洋环境对北方半球大尺度气候模式的敏感性，如晚全新世期间的北大西洋涛动和大西洋年代际涛动。此外，还将量化人为因素对代理记录中发现的变化的影响。