Collaborative Research: Lead-210 and Polonium-210 as tracers for scavenging and export: GEOTRACES Pacific Meridional Section

合作研究：铅 210 和钋 210 作为清除和出口示踪剂：GEOTRACES 太平洋子午线部分

基本信息

批准号：
1736591
负责人：
J Kirk Cochran
金额：
$ 53.97万
依托单位：
SUNY at Stony Brook
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-15 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1736591&HistoricalAwards=false
关键词：
Collaborative Research Lead 210 Polonium

项目摘要

The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. These chemical species play important roles in the ocean as nutrients, tracers of current and past oceanographic processes, and as contaminants from human activity. Their biogeochemical cycling has direct implications for research in such diverse areas as the carbon cycle, climate change, and ocean ecosystems. This project will use measurement of two natural radionuclides -- lead-210 and polonium-210 -- to provide important information about the rates of processes that affect trace elements and isotopes (TEIs) that will be measured during a U.S. GEOTRACES expedition in the Pacific Ocean in 2018. The research proposed here will address key tasks formulated within the GEOTRACES Science Plan. Many processes in the ocean cannot be observed directly but tracers such as polonium-210 (half-life = 138 days) and lead-210 (half-life = 22.3 years) that have unique chemical properties and relevant decay timescales can be used to provide important constraints on their rates and pathways. The goals of this research are to: 1) use Pb-210, along with another project measuring Be-7, in aerosols and precipitation to characterize aerosol and TEI sources, 2) determine scavenging rates of particle-reactive TEIs through the water column using Po-210 and Pb-210, 3) use Po-210 / Pb-210 disequilibrium in the upper water column as a proxy for the sinking flux of particulate organic carbon (POC), and 4) use Pb-210as a tracer of the influence of hydrothermal processes on water column distributions of TEIs. This work will build on a database of Po/Pb distributions in the world ocean (and the Pacific Ocean, in particular) obtained through programs such as GEOSECS, GEOTRACES, and independent studies. A graduate student will be trained as part of this project. The lead investigator, Cochran, plans to incorporate information about GEOTRACES sampling strategies in the planning for a travelling exhibition on "The Oceans" through his adjunct appointment at the American Museum of Natural History (New York). Project partner Kadko plans to incorporate GEOTRACES work in an international graduate course through the Nippon Foundation, Partnership for Observation of the Global Oceans Center of Excellence.

国际 GEOTRACES 计划的目标是了解海洋中微量化学元素及其同位素的分布。这些化学物质在海洋中发挥着重要作用，作为营养物质、当前和过去海洋过程的示踪剂以及人类活动的污染物。它们的生物地球化学循环对碳循环、气候变化和海洋生态系统等不同领域的研究具有直接影响。该项目将使用两种天然放射性核素（铅 210 和钋 210）的测量来提供有关影响微量元素和同位素 (TEI) 的过程速率的重要信息，这些过程将在美国 GEOTRACES 太平洋探险期间进行测量2018 年海洋。此处提出的研究将解决 GEOTRACES 科学计划中制定的关键任务。海洋中的许多过程无法直接观察到，但可以使用具有独特化学性质和相关衰变时间尺度的示踪剂，例如钋210（半衰期= 138天）和铅210（半衰期= 22.3年）来提供对其速率和途径的重要限制。本研究的目标是：1) 使用 Pb-210 以及另一个测量气溶胶和降水中 Be-7 的项目来表征气溶胶和 TEI 来源，2) 使用以下方法确定颗粒反应性 TEI 通过水柱的清除率Po-210 和 Pb-210, 3) 使用上部水柱中的 Po-210 / Pb-210 不平衡作为颗粒物下沉通量的代理有机碳 (POC)，4) 使用 Pb-210 作为热液过程对 TEI 水柱分布影响的示踪剂。这项工作将建立在通过 GEOSECS、GEOTRACES 和独立研究等项目获得的世界海洋（特别是太平洋）的 Po/Pb 分布数据库的基础上。作为该项目的一部分，一名研究生将接受培训。首席研究员 Cochran 计划通过他在美国自然历史博物馆（纽约）的兼职任命，将有关 GEOTRACES 采样策略的信息纳入“海洋”巡回展览的规划中。项目合作伙伴 Kadko 计划通过日本基金会、全球海洋卓越观测中心合作伙伴将 GEOTRACES 工作纳入国际研究生课程。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Quantifying 210Po/210Pb disequilibrium in seawater: A Comparison of two precipitation methods with differing results.

量化海水中 210Po/210Pb 不平衡：两种不同结果的沉淀方法的比较。

DOI：
10.3389/fmars2021.684484
发表时间：
2021
期刊：
Frontiers in marine science
影响因子：
3.7
作者：
Roca-Martí, M;Puigcorbé, V;Castrillejo, M;Casacuberta, N;Garcia-Orellana, J;Cochran, JK;Masqué, P
通讯作者：
Masqué, P

210 Pb and 7 Be as Coupled Flux and Source Tracers for Aerosols in the Pacific Ocean

210 Pb 和 7 Be 作为太平洋气溶胶的耦合通量和源示踪剂

DOI：
10.1029/2022gb007378
发表时间：
2022
期刊：
Global Biogeochemical Cycles
影响因子：
5.2
作者：
Wei, Ziran;Cochran, J. Kirk;Horowitz, Evan;Fitzgerald, Patrick;Heilbrun, Christina;Kadko, David;Stephens, Mark;Marsay, Chris M.;Buck, Clifton S.;Landing, William M.
通讯作者：
Landing, William M.

210Po and 210Pb distributions during a phytoplankton bloom in the North Atlantic: Implications for POC export.

北大西洋浮游植物大量繁殖期间 210Po 和 210Pb 的分布：对 POC 出口的影响。