US GEOTRACES GP17-OCE and GP17-ANT: Inorganic Carbon Cycling in the South Pacific and Southern Oceans by Direct Measurement

美国 GEOTRACES GP17-OCE 和 GP17-ANT：通过直接测量南太平洋和南大洋的无机碳循环

• 批准号: 2148468
• 负责人: Ryan Woosley
• 金额: $ 83.09万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-03-01 至 2025-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2148468&HistoricalAwards=false
• 关键词: US; GEOTRACES; GP17; OCE; ANT

The oceans help to slow climate change by absorbing about a quarter of the carbon dioxide (CO2) produced by burning of fossil fuels and other human activities. The Pacific and Southern Oceans are known to take up and store significant amounts of anthropogenic CO2, but many questions regarding the amount, variability, and biogeochemical and ecological impacts remain unanswered. This research will focus on answering some of those questions in two areas of the Pacific by analyzing samples for total CO2, total alkalinity, and pH on two GEOTRACES cruises, GP17-OCE and GP17-ANT. The project will support several undergraduate student researchers and create educational modules on ocean acidification for general public and K-12 students.On the GP17-OCE expedition in the south Pacific, sub-decadal scale variability in the uptake of CO2 and resulting decrease in pH (termed ocean acidification) will be examined by comparing data collected on this expedition with data from prior occupations of the line in 1991, 2005 and 2014. An extended multilinear regression technique will be used to separate natural variability from human induced changes. The second expedition, GP17-ANT, covers the Amundsen Sea, an area with few prior carbon measurements. This sea is perennially ice-covered with several seasonal polynyas (areas of open water surrounded by sea ice) and exhibits complex water circulation making the contribution to the global carbon cycle uncertain. The data collected from this expedition will examine several hypotheses regarding how carbon is taken up, mixed, and recirculated in the region, how glacial ice melt, sea ice, and biological productivity influence the carbon cycle, and provide baseline measurements against future data to determine changes in the carbon cycle of the region over time. Both expeditions will leverage the myriad of other parameters being measured, particularly trace metals such as iron and zinc, to examine how cycling of carbon and trace metals are interlinked through pH.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

海洋吸收了化石燃料燃烧和其他人类活动产生的约四分之一的二氧化碳，有助于减缓气候变化。众所周知，太平洋和南大洋吸收和储存了大量人为排放的二氧化碳，但关于其数量、变化以及生物地球化学和生态影响的许多问题仍未得到解答。本研究将通过分析两艘GEOTRACES巡航船GP17-OCE和GP17-ANT上的总二氧化碳、总碱度和pH值样本，重点回答太平洋两个地区的一些问题。该项目将支持几名本科生研究人员，并为公众和K-12学生创建有关海洋酸化的教育模块。在南太平洋的GP17-OCE考察中，将通过将这次考察收集的数据与1991年、2005年和2014年在这条线上收集的数据进行比较，来检查二氧化碳吸收的次年代际变化和由此导致的pH值下降（称为海洋酸化）。一种扩展的多元线性回归技术将用于将自然变率与人为引起的变化分开。第二次探险，GP17-ANT，覆盖了阿蒙森海，这是一个之前很少有碳测量的地区。这片海域常年被冰覆盖，有几个季节性冰湖（被海冰包围的开阔水域），并表现出复杂的水循环，这使得对全球碳循环的贡献不确定。从这次考察中收集的数据将检验几个关于碳如何在该地区被吸收、混合和再循环的假设，冰川融化、海冰和生物生产力如何影响碳循环，并为未来数据提供基线测量，以确定该地区碳循环随时间的变化。这两项考察都将利用被测量的无数其他参数，特别是微量金属，如铁和锌，来研究碳和微量金属的循环是如何通过博士学位相互联系的。这一奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Coincident Biogenic Nitrite and pH Maxima Arise in the Upper Anoxic Layer in the Eastern Tropical North Pacific

• DOI: 10.1029/2022gb007470
• 发表时间: 2022-12
• 期刊: Global Biogeochemical Cycles
• 影响因子: 5.2
• 作者: Timur Cinay;Diana Dumit;R. Woosley;Elisabeth L. Boles;Jarek V. Kwiecinski;Susan Mullen;T. Tamasi;M. Wolf;Colette L. Kelly;N. M. Travis;K. Casciotti;A. R. Babbin

Uncertainty sources for measurable ocean carbonate chemistry variables

可测量海洋碳酸盐化学变量的不确定性来源

• DOI: 10.1002/lno.12477
• 发表时间: 2023
• 期刊: Limnology and Oceanography
• 影响因子: 4.5
• 作者: Carter, Brendan R.;Sharp, Jonathan D.;Dickson, Andrew G.;Álvarez, Marta;Fong, Michael B.;García‐Ibáñez, Maribel I.;Woosley, Ryan J.;Takeshita, Yuichiro;Barbero, Leticia;Byrne, Robert H.
• 通讯作者: Byrne, Robert H.