Evaluation of the net CO_2 uptake in the Canada Basin in the summer of 2008

作     者：SUN Heng GAO Zhongyong LU Peng XIU Peng CHEN Liqi 

作者机构：Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic AdministrationThird Institute of OceanographyState Oceanic Administration State Key Laboratory of Coastal and Offshore EngineeringDalian University of Technology State Key Laboratory of Tropical OceanographySouth China Sea Institute of OceanologyChinese Academy of Sciences 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2017年第36卷第8期

页      面：94-100页

核心收录：

学科分类：0710[理学-生物学] 070702[理学-海洋化学] 0908[农学-水产] 07[理学] 0707[理学-海洋科学] 

基　　金：The National Natural Science Foundation of China(NSFC) under contract Nos 41476173 and 41406221 the Chinese Projects for Investigations and Assessments of the Arctic and Ant Arctic under contract Nos CHINARE2012-04-04 and 2012-04-03 the Fujian Science and Technology Innovation Leader Project 2016 the Scientific Research Foundation of Third Institute of Oceanography,SOA under contract No.2014006 

主　　题：Canada Basin net CO2 uptake partial pressure of CO2 

摘      要：The third Chinese National Arctic Research Expedition （CHINARE） was conducted in the summer of 2008. During the survey, the surface seawater partial pressure of CO2 （pCO2） was measured, and sea water samples were collected for CO2 measurement in the Canada Basin. The distribution of pCO2 in the Canada Basin was determined, the influencing factors were addressed, and the air-sea CO2 flux in the Canada Basin was evaluated. The Canada Basin was divided into three regions： the ice-free zone （south of 77°N）, the partially ice-covered zone （77°-80°N）, and the heavily ice-covered zone （north of 80°N）. In the ice-free zone, pCO2 was high （320 to 368 patm, 1 patm=0.101 325 Pa）, primarily due to rapid equilibration with atmospheric CO2 over a short time. In the partially ice-covered zone, the surface pCOs was relatively low （250 to 270 patm） due to ice-edge blooms and icemelt water dilution. In the heavily ice-covered zone, the seawater pCO2 varied between 270 and 300 laatm due to biological COs removal, the transportation of low pCOs water northward, and heavy ice cover. The surface seawater pCO2 during the survey was undersaturated with respect to the atmosphere in the Canada Basin, and it was a net sink for atmospheric CO2. The summertime net CO2 uptake of the ice-free zone, the partially ice-covered zone and the heavily ice-covered zone was （4.14±1.08）, （1.79±0.19）, and （0.57±0.03） Tg/a （calculated by carbon, 1 Tg=10^12 g）, respectively. Overall, the net COs sink of the Canada Basin in the summer of 2008 was （6.5＋1.3） Tg/a, which accounted for 4%-10% of the Arctic Ocean COs sink.