| SUN Heng,GAO Zhongyong,LU Peng,XIU Peng,CHEN Liqi. 2017. Evaluation of the net CO2 uptake in the Canada Basin in the summer of 2008. Acta Oceanologica Sinica, 36(8):94－100 |
| Evaluation of the net CO2 uptake in the Canada Basin in the summer of 2008 |
| 2008年夏季加拿大海盆净二氧化碳吸收量评估 |
| Received:July 31, 2016 |
| DOI：10.1007/s13131-017-1028-9 |
| Key words:Canada Basin net CO2 uptake partial pressure of CO2 |
| 中文关键词: 加拿大海盆 净CO2吸收量 CO2分压 |
| 基金项目: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 AntArctic 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. |
| Author Name | Affiliation | E-mail | | SUN Heng | Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | GAO Zhongyong | Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | gaozhongyong@tio.org.cn | | LU Peng | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China | | | XIU Peng | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | CHEN Liqi | Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | |
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| Abstract: |
| 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 μatm, 1 μatm=0.101 325 Pa), primarily due to rapid equilibration with atmospheric CO2 over a short time. In the partially ice-covered zone, the surface pCO2 was relatively low (250 to 270 μatm) due to ice-edge blooms and ice-melt water dilution. In the heavily ice-covered zone, the seawater pCO2 varied between 270 and 300 μatm due to biological CO2 removal, the transportation of low pCO2 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=1012 g), respectively. Overall, the net CO2 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 CO2 sink. |
| 中文摘要: |
| 第三次中国北极考察队（CHINARE）于2008年夏季进行。在调查中，测量了加拿大海盆表层海水的二氧化碳分压（pCO2），并采集二氧化碳海水样品进行测量。研究确定了加拿大海盆pCO2的分布情况，对影响因素进行了分析，并对加拿大海盆的海洋二氧化碳通量进行了评估。加拿大海盆分为3个区域：无冰区（77°N以南），海冰部分覆盖区（77°N-80°N）和海冰严重覆盖区（80°N以北）。在无冰区，pCO2较高（320至368μatm），主要是由于在短时间内与大气CO2快速平衡。在海冰部分覆盖区，由于海冰边缘水华和冰融水稀释，表层pCO2相对较低（250至270μatm）。在海冰严重覆盖区，由于生物对二氧化碳的清除，低pCO2水向北运输和海冰覆盖的阻碍，海水pCO2在270和300μatm之间变化。调查期间，加拿大海盆表层海水pCO2是不饱和的，是大气CO2的净汇。无冰区，海冰部分覆盖区和海冰严重覆盖区的夏季净CO2吸收量分别为4.14±1.08 Tg C/a，1.79±0.19 Tg C/a和0.57±0.03 Tg C/a （1 Tg=1012g）。总体而言，2008年夏季加拿大海盆净CO2吸收量为6.5±1.3 Tg C/a，占北冰洋二氧化碳吸收量的4-10%。 |
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