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.

该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生物地球化学循环记录。我们预计这些记录不仅会产生当地信息，还会记录北大西洋涛动等大规模气候模式的影响。这一目标需要开发新颖的传递函数，以便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和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，我们推导了一个传递函数来检查空间和时间域的变异性，从而成为从代理记录重建时间气候变化的更直接的方法。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生物地球化学海洋模型，包括使用目标代理变量模拟合成沉积物岩心。在这段时间内，可以使用高质量的再分析数据来推动模型的建立。然后将建模的时间序列与从可用的表面沉积物和沉积岩芯生成的高分辨率代理记录进行比较。塔兰托湾是这项研究的理想区域，因为海洋环境与陆地气候变化密切相关，沉积物在沉积中心以高速率积累，允许以亚十年分辨率重建环境变化。然后，我们新的时空传递函数将应用于重建仪器周期（至少自 1850 年以来，个别记录甚至更长）的区域气候和生物地球化学变异性，从而可以评估重建的质量。随后，我们将把重建扩展到可用代理记录的完整长度（大约5000年）。我们计划研究地中海海洋环境对北半球大规模气候模式的敏感性，例如全新世晚期的北大西洋涛动和大西洋多年代际涛动。此外，人为对代理记录中发现的变化的贡献将被量化。