Collaborative Research: Time-Series Responses to a Mid- Ocean Ridge Volcanic Event: Juan de Fuca and Gorda Ridges
Collaborative Research: Time-Series Responses to a Mid- Ocean Ridge Volcanic Event: Juan de Fuca and Gorda Ridges
批准号:
9902048
负责人:
Stephen Giovannoni
金额:
$2.06万
依托单位:
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
1999
资助国家:
美国
项目状态:
已结题
起止时间:
1999-02-01 至 2000-06-30
中文摘要
海脊轴脉/喷发事件是一系列与洋壳形成有关的相互关联和快速演变的物理、化学和生物过程的幕式扰动。火山活动产生具有明显地球化学特征的热液排放,并在辅助地壳和上覆水柱中触发特定的地球化学和微生物反应。观察和量化相关过程之间的协变为目前不成熟的海底火山-热液系统模型提供了新的基本约束。热液羽流中的化学和生物参数变化很快,最大的变化速度发生在它们在深海中排放和混合后的几秒钟到几天内。在这里,我们建议对一次远程探测到的莫尔火山事件进行全面、快速和后续的实地反应。我们的项目强调对演化中的热液事件羽流的关键动态物理、地球化学和地质微生物特性的时间序列观测和实验。对这些事件的快速反应将使我们能够:(1)获得初始通量--不受老化影响的初始通量;(2)研究热液事件羽流的化学和生物演化,这是一个用于监测热液喷出物内部变化的自然、临时受限的实验;(3)利用事件羽流作为进入地下生物圈的一个宝贵窗口。
英文摘要
Ridge axis diking/eruptive events are episodic perturbations that trigger a sequence of interrelated and rapidly evolving physical, chemical, and biological processes associated with the formation of ocean crust. Volcanic activity produces hydrothermal discharge with a distinct geochemical signature, and triggers specific geochemical and microbial responses in the adjuacent crust and overlying water-column. Observing and quantifying co-variation among related processes provides basic new constraints on presently immature models of submarine volcano-hydrothermal systems. Chemical and biological parameters within hydrothermal plumes change rapidly, with the steepest rate of change occurring over seconds to days following their discharge and subseuent mixing in the deep sea. Here we propose to mount comprehensive rapid and follow-up field responses to a remotely detected MOR volcanic event. Our project emphasizes time-series observations and experiments on key dynamic physical, geochemical, and geomicrobial properties of an evolving hydrothermal event plume. A rapid response to these events will allow us: (1) to obtain the initial flux--that unaffected by aging; (2) to study the chemical and biological evolution of hydrothermal event plumes, representing a natural, temporarily constrained experiment for monitoring transformations within hydrothermal effuents; (3) to exploit event plumes as an invaluable window to the subsurface biosphere.
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Coastal Bacterioplankton Systematics: A High Throughput Culturing Approach
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LEXEN: Effects of Microbial Activity on Rates of Basalt Alteration
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批准号:0085436
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Advanced Microbe Isolation Laboratory
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批准号:9977469
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Collaborative Research on Bacterioplankton Biology and Biogeochemistry at the Bermuda Atlantic Time-series Station: An Oceanic Microbial Observatory
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批准号:9977930
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LEXEN: Development of Capability to Measure Proxies of Microbial Activity within Oceanic Crust (Collaborative Research)
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依托单位:
Interactions Between Bacterioplankton Communities and Dissolved Substrates at the Bermuda Atlantic Time Series Study Station
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批准号:9618530
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Spatial, Temporal, and Phylogenetic Structure of Bacterioplankton Communities in Crater Lake, Oregon
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Molecular Analyses of the Population Dynamics and Activity of a Newly Identified Bacterioplankton Group: The SAR11 Cluster
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In situ Analyses of the Distributions and Phylogeny of Cultivatable and Non-cultivatable Planctomycetales Using Phylogenetic Group-Specific RNA Probes
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依托单位:
国内基金
海外基金
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