Controls on Sea Surface pCO2 Variability and CO2 Uptake in the Western Arctic Ocean

对北冰洋西部海面 pCO2 变化和 CO2 吸收的控制

• 批准号: 0909330
• 负责人: Wei-Jun Cai
• 金额: $ 36.59万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0909330&HistoricalAwards=false
• 关键词: Controls; Sea; Surface; pCO2; Variability

This award is funded under the American Recovery and Reinvestment Act of 2009(Public Law 111-5).This proposal seeks funding to study carbon cycling and CO2 uptake in the western Arctic Ocean through participation in the Chinese Arctic Research Expedition cruise in summer 2010. Surface water pCO2 measurements will be collected continuously through a high-resolution underway CO2 analyzer that has already been installed on the Chinese icebreaker Xue Long. Discrete water samples will be collected and analyzed for pH, dissolved inorganic carbon (DIC), total alkalinity, and calcium as well as oxygen isotopes, carbon isotopes, nutrients, dissolved oxygen (and apparent oxygen utilization), chlorophyll-a, dissolved organic carbon (DOC), and particulate organic carbon (POC). These data will be used to constrain air-sea fluxes of carbon dioxide and their spatial variability. Key processes under investigation include the uptake of CO2 by newly exposed surface waters following sea ice melt, and the contribution of riverine DIC and DOC to the Arctic Ocean net carbon uptake. Each of these processes is projected to change in a warming Arctic. Understanding carbon fluxes and the mechanisms controlling them in the Arctic Ocean is a prerequisite for confident prediction of future changes and climate feedbacks. This project would build international collaborations in Arctic science and strengthen Chinese Arctic research efforts. A Ph.D. student at the University of Georgia would be supported for three years through this project.

该奖项根据《2009 年美国复苏与再投资法案》（公法 111-5）提供资金。该提案旨在通过参加 2010 年夏季的中国北极科考航次，为研究北冰洋西部的碳循环和二氧化碳吸收提供资金。地表水 pCO2 测量值将通过已安装在中国雪龙号破冰船上的高分辨率水中 CO2 分析仪连续收集。将收集离散水样并分析 pH、溶解无机碳 (DIC)、总碱度和钙以及氧同位素、碳同位素、营养物、溶解氧（和表观氧利用率）、叶绿素-a、溶解有机碳（DOC）和颗粒有机碳（POC）。这些数据将用于限制二氧化碳的海气通量及其空间变化。正在研究的关键过程包括海冰融化后新暴露的地表水对二氧化碳的吸收，以及河流 DIC 和 DOC 对北冰洋净碳吸收的贡献。随着北极变暖，这些过程中的每一个预计都会发生变化。了解北冰洋的碳通量及其控制机制是自信预测未来变化和气候反馈的先决条件。该项目将建立北极科学领域的国际合作并加强中国的北极研究工作。博士学位乔治亚大学的学生将通过该项目获得三年的支持。