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

该奖项是根据2009年美国复苏和再投资法案（公法111 - 5）资助的。该提案旨在通过参与2010年夏季中国北极研究考察巡航来研究北冰洋西部的碳循环和CO2吸收。地表水pCO2测量值将通过已经安装在中国破冰船雪龙号上的高分辨率航行中CO2分析仪连续收集。将收集离散水样，并分析pH值、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异性。正在调查的关键过程包括新暴露的表面沃茨海冰融化后的CO2吸收，以及河流DIC和DOC对北冰洋净碳吸收的贡献。预计这些过程中的每一个都将在变暖的北极发生变化。了解北冰洋的碳通量及其控制机制是可靠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的国际合作，并加强中国的北极研究工作。博士学位格鲁吉亚大学的一名学生将通过该项目获得三年的资助。

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.