权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Subtropical South African hydroclimate during the mid-Piacenzian Warm Period recorded by fynbos vegetation as a test case for climate model performance

凡波斯植被记录的皮亚琴兹暖期中期的南非亚热带水气候，作为气候模型性能的测试案例

基本信息

批准号：
407425889
负责人：
Dr. Lydie Madeleine Dupont
金额：
--
依托单位：
Institut für Geowissenschaften
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/407425889?language=en
关键词：
Subtropical South African hydroclimate during

项目摘要

The late Pliocene period between 3.264 and 3.025 Ma called mid-Piancenzian Warm Period (mWPW) is extensively studied by modelers and palaeoclimatologists because it presents a geologic analogue for future warming. Data-model comparisons reveal a mismatch between climate model predictions and palaeorecords: Many climate models predict drier subtropical regions during warm periods with enhanced atmospheric carbon dioxide concentrations, whereas palaeorecords of the mWPW indicate wetter subtropical regions. However, the available palaeorecords are concentrated on the northern hemisphere and there are no high temporal resolution records for the southern hemisphere. To fill this gap, I propose a study of orbital resolved fluctuations during the mWPW of South African subtropical hydroclimate registered by the pollen from fynbos vegetation in deep-sea marine sediments recovered southwest from Cape Town. The relative importance of two different forcing mechanisms on the climate of subtropical South African will be tested. On one hand, the influence of changes in sea surface temperatures along the west coast of South Africa related to the strength and position of the South Atlantic High. On the other hand, the effect of changes in the latitude of the Antarctic Subtropical Front and associated west wind drift.

上新世晚期(3.264~3.025 Ma)被称为中偏安世暖期，由于它代表了未来气候变暖的地质类比，因此受到模型学家和古气候学家的广泛研究。数据模型的比较揭示了气候模型预测与古记录之间的不匹配：许多气候模型预测在大气二氧化碳浓度增加的温暖时期亚热带地区更干燥，而mWPW的古代记录表明亚热带地区更潮湿。然而，现有的古记录主要集中在北半球，而南半球没有高时间分辨率的记录。为了填补这一空白，我提议进行一项关于南非亚热带水气候mWPW期间轨道分辨波动的研究，记录了从开普敦向西南方向采集的深海海洋沉积物中Fynbos植被的花粉。两种不同的强迫机制对南非亚热带气候的相对重要性将得到检验。一方面，南非西海岸海面温度变化的影响与南大西洋高压的强度和位置有关。另一方面，南极副热带锋纬度变化的影响以及与之相关的西风漂移。