Impacts of abrupt glacial and deglacial climate events on vegetation and fire regime in the Middle Atlas, Morocco

突然的冰期和冰消期气候事件对摩洛哥中阿特拉斯地区植被和火灾状况的影响

• 批准号: NE/K000608/1
• 负责人: William Fletcher
• 金额: $ 8.32万
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2012
• 资助国家: 英国
• 起止时间: 2012 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FK000608%2F1
• 关键词: Impacts; abrupt; glacial; deglacial; climate

The lakes of the Middle Atlas have provided several valuable records of Holocene environmental change. Their potential to elucidate the timing and impacts of abrupt climate changes and millennial-scale climate variability prior to the Holocene has been little exploited, however. In a recent review of vegetation records of millennial-scale variability during the last glacial (73,500 - 14,700 calendar years ago, 73.4-14.7 ka BP), the paucity of records from North African Mediterranean borderlands was identified as a major limitation to the understanding of spatial variability in past climate dynamics associated with abrupt climate events evident in marine and ice core records (Dansgaard-Oeschger and Heinrich variability). Research from the Alboran Sea raises several questions regarding the phasing of climate variability between the mountains of Northwest Africa and southwestern Europe, in particular regarding moisture availability during high-latitude cooling events, with important implications for the understanding of past air mass trajectories in the subtropics. New data are required to resolve the nature of the hydrological regime and the role of fire during abrupt climate events. This project will undertake high-resolution palaeoecological investigation of new deep-lake cores retrieved from Middle Atlas lakes. The coring mission, fully funded by the DFG (Deutsche Forschungsgemeinschaft), is scheduled for September 2012. In this project, analysis of vegetation change and fire regime will be undertaken at centennial-scale resolution, supported by the development of a robust AMS radiocarbon chronological framework, in the framework of an international collaborative approach incorporating sedimentological, palaeolimnological, palaeohydrological and geochemical investigation. This project will advance the understanding of climate-vegetation-fire interactions in the Mediterranean region and the sensitivity of montane ecosystems to abrupt climate forcing. It will also contribute to the understanding of climate dynamics, notably air mass movements and hydrological regime, in the region of Atlantic-Mediterranean-Saharan climatological interaction.

中阿特拉斯的湖泊为全新世的环境变化提供了宝贵的记录。然而，它们在阐明全新世之前气候突变和千年尺度气候变率的时间和影响方面的潜力却很少得到开发。最近对末次冰期（73500 - 14700历年前，73.4-14.7 ka BP）的千年尺度植被变化记录进行了回顾，发现北非地中海边缘地区记录的缺乏是理解与海洋和冰芯记录（Dansgaard-Oeschger和Heinrich变率）中明显的气候突变事件相关的过去气候动力学空间变率的主要限制。来自Alboran海的研究提出了几个关于非洲西北部山区和欧洲西南部之间气候变率的分阶段的问题，特别是关于高纬度冷却事件期间的水分可用性的问题，这对理解过去亚热带气团轨迹具有重要意义。需要新的数据来解决水文状况的性质和火灾在突发气候事件中的作用。该项目将对从阿特拉斯中部湖泊获取的新深湖岩心进行高分辨率古生态调查。取心任务将于2012年9月进行，全部资金由德国联邦调查局提供。在该项目中，将以百年尺度分辨率对植被变化和火灾状况进行分析，并在国际合作方法的框架内，结合沉积学、古湖泊学、古水文和地球化学调查，开发一个强大的AMS放射性碳年代学框架。该项目将促进对地中海地区气候-植被-火灾相互作用的理解以及山地生态系统对气候突变强迫的敏感性。它还将有助于了解大西洋-地中海-撒哈拉气候相互作用区域的气候动力学，特别是气团运动和水文制度。

项目成果

Western Mediterranean hydro-climatic consequences of Holocene iceberg advances (Bond events)

• DOI: 10.5194/cp-2018-97
• 发表时间: 2018-08
• 期刊: Climate of The Past Discussions
• 作者: C. Zielhofer;Anne Köhler;Steffen Mischke;A. Benkaddour;Abdeslam Mikdad;William J. Fletcher

AMS radiocarbon dating of pollen concentrates in a karstic lake system

• DOI: 10.1016/j.quageo.2017.02.006
• 发表时间: 2017-04-01
• 期刊: QUATERNARY GEOCHRONOLOGY
• 影响因子: 2.7
• 作者: Fletcher, William J.;Zielhofer, Christoph;Fink, David
• 通讯作者: Fink, David

Millennial-scale fluctuations in Saharan dust supply across the decline of the African Humid Period

• DOI: 10.1016/j.quascirev.2017.07.010
• 发表时间: 2017-09-01
• 期刊: QUATERNARY SCIENCE REVIEWS
• 影响因子: 4
• 作者: Zielhofer, Christoph;von Suchodoletz, Hans;Mikdad, Abdeslam
• 通讯作者: Mikdad, Abdeslam

Atlantic forcing of Western Mediterranean winter rain minima during the last 12,000 years

• DOI: 10.1016/j.quascirev.2016.11.037
• 发表时间: 2017-02
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: C. Zielhofer;W. Fletcher;S. Mischke;M. Batist;J. Campbell;S. Joannin;R. Tjallingii;N. Hamouti;A. Junginger;A. Stele;J. Bussmann;B. Schneider;T. Lauer;K. Spitzer;M. Strupler;T. Brachert;Abdeslam Mikdad

Western Mediterranean hydro-climatic consequences of Holocene ice-rafted debris (Bond) events

• DOI: 10.5194/cp-15-463-2019
• 发表时间: 2019-03
• 期刊: Climate of the Past
• 影响因子: 4.3
• 作者: C. Zielhofer;Anne Köhler;S. Mischke;A. Benkaddour;Abdeslam Mikdad;W. Fletcher