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

• 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

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.

这项 NSF-GEO/NERC 联合提案的主要科学目标是获得墨西哥城地区过去 35 万年气候和火山活动变化的连续、高分辨率记录。我们将分析最近从墨西哥城南郊查尔科湖盆地发现的约 350 米长的岩心。该沉积物序列将成为目前缺乏气候、环境和生物群记录的地区最长的档案之一。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，这对于评估当前和未来气候变化的影响至关重要。由于持续的气候变化，预计墨西哥将在未来几十年内变得更加干燥，而这些人为变化将叠加在尚未完全了解的气候系统的自然变化上。该项目将提取过去 35 万年的温度和降水信息，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发性火山活动的独特记录，保存了超过 150 次火山喷发的火山灰。这些火山灰层很可能来自墨西哥城周围的主要成层火山以及位于该市南部的广泛的单基因场。我们将利用这些喷发沉积物来获取岩心的年表，并确定过去喷发的强度和频率。有关这些火山长期历史的信息对于这个人口稠密地区的危害和风险评估非常宝贵。