NSFGEO-NERC: Collaborative Research: Mexidrill: Developing a 350,000 year record of climate and environmental change in tropical North America

NSFGEO-NERC：合作研究：Mexidrill：开发北美热带地区 35 万年的气候和环境变化记录

基本信息

批准号：
NE/S009027/1
负责人：
Darren Francis Mark
金额：
$ 7.99万
依托单位：
Scottish Universities Environmental Research Centre
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2018
资助国家：
英国
起止时间：
2018 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FS009027%2F1
关键词：
NSFGEO NERC Collaborative Research Mexidrill

项目摘要

The primary scientific objective of this joint NSF-GEO/NERC proposal is to obtain a continuous, high-resolution record of past changes in climate and volcanism in the Mexico City region over the last 350,000 years. We will analyse a recently recovered ~350 metre-long core from the Lake Chalco basin on the southern outskirts of Mexico City. This sediment sequence will be among the longest archives of climate, environment, and biota from a region presently lacking such records. Information obtained from these cores will help understand the mechanisms that caused past climate shifts, which is critical for evaluating impacts of ongoing and future climate change. Mexico is projected to become drier in the coming decades-centuries in response to ongoing climate change, and these anthropogenic changes will be superimposed on natural variability in climate systems that are not fully understood. This project will extract information on the temperature and precipitation over the last 350,000 years to evaluate the drivers of the climate. The Chalco sedimentary sequence also provides a unique record of the explosive volcanism in the Mexico City region, with ash from more than 150 volcanic eruptions preserved. These volcanic ash layers are likely to be from the major stratovolcanoes that surround Mexico City and the extensive monogenetic field situated in the southern part of the city. We will use these eruption deposits to obtain a chronology for the core and establish the magnitude and frequency of past eruptions. This information on the long-term history of these volcanoes will be invaluable for hazard and risk assessments for this densely populated region.

该联合NSF-GEO/NERC提议的主要科学目标是在过去350，000年中获得墨西哥城地区气候和火山症的过去变化的连续高分辨率记录。我们将分析墨西哥城南部郊区的Chalco湖盆地最近恢复的约350米长的核心。该沉积物序列将是目前缺乏此类记录的地区气候，环境和生物群的最长档案之一。从这些核心获得的信息将有助于了解导致过去气候变化的机制，这对于评估持续和未来气候变化的影响至关重要。由于持续的气候变化，墨西哥预计在未来几十年的世纪中会变得更干燥，并且这些人为变化将叠加在尚未完全了解的气候系统中的自然变化上。该项目将在过去350，000年中提取有关温度和降水量的信息，以评估气候的驱动因素。 Chalco沉积序列还提供了墨西哥城地区爆炸性火山的独特记录，并保留了150次火山喷发的灰烬。这些火山灰层可能来自墨西哥城周围的主要层状山和城市南部的广泛单基因田。我们将使用这些喷发沉积物来获得核心的年表，并确定过去喷发的幅度和频率。这些有关这些火山长期历史的信息对于这个人口稠密的地区的危害和风险评估将是无价的。