Reconstructing Mediterranean Overflow Plume Properties
重建地中海溢流羽流特性
基本信息
- 批准号:NE/Y006461/1
- 负责人:
- 金额:$ 10.58万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2023
- 资助国家:英国
- 起止时间:2023 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
The ocean plays a critical role in regulating climate, redistributing heat from the equator to poles and absorbing atmospheric CO2. These processes are partly controlled by the temperature and salinity differences across the ocean that drive ocean circulation. Seas like the Mediterranean that lose more fresh water by evaporation than they gain from rivers flowing into them, are an important source of dense, salty water. Mediterranean water overflows a narrow, shallow sill in the Gibraltar Strait, forming a plume that follows seafloor contours around Spain and Portugal, flowing northwards to the Arctic. Today, the source of the most dense water flowing into the North Atlantic is the Mediterranean. In the past however, this water was at least three times more dense. Five to six million years ago, around 6% of all the salt in the ocean precipitated on the Mediterranean sea floor as a salt giant. This raised Mediterranean salinity dramatically, changing both the chemical and physical properties of the Mediterranean's overflow water. To evaluate the impact of these changes on regional and global climate, the overflow's properties have first to be determined. Some of these properties such as the size and location of the ancient plume can be mapped from the distribution of the sediment that the overflow produced. Others, like temperature, salinity, density and the chemistry of the water cannot be measured directly, but must be reconstructed from proxies of these properties that are preserved as part of the overflow sediment.IODP Expedition 401 will recover the sediment deposited by the overflow plume in the Atlantic during salt giant formation. The size of the particles in these sediments will be measured to determine the speed it was flowing. Microscopic organisms that live at the bottom of the sea, build their shells from the water in which they dwell. These shells are preserved as fossils long after the organism has died and their chemical composition reflects, in part, the temperature, salinity and chemistry of the water. By viewing the sediments under a microscope, these tiny fossils can be picked out with a fine paintbrush and then analysed. The records generated will provide a quantitative picture of the evolution of both Mediterranean overflow water and its interaction with the Atlantic. This is a critical first step towards evaluating the climatic impact of perturbations to ocean chemistry as a consequence of evaporite formation and the resulting high salinity overflows.
海洋在调节气候、将热量从赤道重新分配到两极和吸收大气中的二氧化碳方面发挥着关键作用。这些过程在一定程度上受到驱动海洋环流的海洋温度和盐度差异的控制。像地中海这样的海洋,由于蒸发而失去的淡水比从流入它们的河流中获得的淡水还要多,是高密度咸水的重要来源。地中海的水溢出直布罗陀海峡一个狭窄而浅的岩床,沿着西班牙和葡萄牙周围的海底轮廓形成一个羽状流,向北流向北极。今天,流入北大西洋的密度最大的水源是地中海。然而,在过去,这些水的密度至少是现在的三倍。500万到600万年前,海洋中大约6%的盐沉淀在地中海海底,成为一个盐巨人。这大大提高了地中海的盐度,改变了地中海溢出水的化学和物理性质。为了评估这些变化对区域和全球气候的影响,必须首先确定溢流的性质。其中一些属性,如古代羽流的大小和位置,可以从溢流产生的沉积物的分布中绘制出来。其他的,如温度,盐度,密度和水的化学成分不能直接测量,但必须从这些属性的替代物中重建,这些属性作为溢流沉积物的一部分保存下来。IODP Expedition 401将恢复盐巨人形成期间由大西洋溢流羽流沉积的沉积物。将测量这些沉积物中颗粒的大小,以确定其流动的速度。生活在海底的微生物,从它们居住的水中建造它们的外壳。这些贝壳在生物体死亡后很久才作为化石保存下来,它们的化学成分部分反映了水的温度,盐度和化学成分。通过在显微镜下观察沉积物,这些微小的化石可以用细画笔挑出,然后进行分析。所产生的记录将提供地中海溢出水的演变及其与大西洋相互作用的定量图片。这是评估蒸发岩形成和由此产生的高盐度溢流造成的海洋化学扰动对气候影响的关键的第一步。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Rachel Flecker其他文献
単結晶X 線法によるδ-AlOOH 相の圧力誘起相転移後の結晶構造
单晶X射线法研究压力诱导相变后δ-AlOOH相的晶体结构
- DOI:
- 发表时间:
2013 - 期刊:
- 影响因子:0
- 作者:
Junichiro Kuroda;Francisco J. Jimenez-Espejo;Tatsuo Nozaki;Rocco Gennari;Stefano Lugli;Vinicio Manzi;Marco Roveri;Rachel Flecker;Francisco J. Sierro;Toshihiro Yoshimura;Katsuhiko Suzuki and Naohiko Ohkouchi;栗林貴弘,佐野(古川)亜沙美,長瀬敏郎 - 通讯作者:
栗林貴弘,佐野(古川)亜沙美,長瀬敏郎
つくばエキスポセンターの石材に見られる化石
在筑波博览中心的石头中发现的化石
- DOI:
- 发表时间:
2013 - 期刊:
- 影响因子:0
- 作者:
Junichiro Kuroda;Francisco J. Jimenez-Espejo;Tatsuo Nozaki;Rocco Gennari;Stefano Lugli;Vinicio Manzi;Marco Roveri;Rachel Flecker;Katsuhiko Suzuki;Toshihiro Yoshimura;Francisco Sierro and Naohiko Ohkouchi;井川敏恵・中澤 努・兼子尚知・利光誠一・住田達哉 - 通讯作者:
井川敏恵・中澤 努・兼子尚知・利光誠一・住田達哉
The myth of the Messinian Dardanelles: Late Miocene stratigraphy and palaeogeography of the ancient Aegean-Black Sea gateway
- DOI:
10.1016/j.palaeo.2020.110033 - 发表时间:
2020-12-15 - 期刊:
- 影响因子:
- 作者:
Wout Krijgsman;Marius Stoica;Thomas M. Hoyle;Elisabeth L. Jorissen;Sergei Lazarev;Lea Rausch;Diksha Bista;Mehmet Cihat Alçiçek;Ayhan Ilgar;Lars W. van den Hoek Ostende;Serdar Mayda;Isabella Raffi;Rachel Flecker;Oleg Mandic;Thomas A. Neubauer;Frank P. Wesselingh - 通讯作者:
Frank P. Wesselingh
Causes and consequences of the Messinian salinity crisis
墨西拿盐度危机的原因和后果
- DOI:
10.1038/s43017-024-00533-1 - 发表时间:
2024-04-16 - 期刊:
- 影响因子:71.500
- 作者:
Wout Krijgsman;Eelco J. Rohling;Dan V. Palcu;Fadl Raad;Udara Amarathunga;Rachel Flecker;Fabio Florindo;Andrew P. Roberts;Francisco J. Sierro;Giovanni Aloisi - 通讯作者:
Giovanni Aloisi
Rachel Flecker的其他文献
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{{ truncateString('Rachel Flecker', 18)}}的其他基金
NERC-FAPESP: the Marine Gateways Project - Quantifying the causes and climatic consequences of the opening of the South Atlantic
NERC-FAPESP:海洋门户项目 - 量化南大西洋开放的原因和气候后果
- 批准号:
NE/X002853/1 - 财政年份:2022
- 资助金额:
$ 10.58万 - 项目类别:
Research Grant
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