Carbon dioxide variations in the Greenland Sea (scientific paper)

元データ 国立極地研究所

概要

pCO_2 in the surface layer of the Greenland Sea shows spatial and temporal variations. Lower values appear in the western and northern part of the sea in August, rising in value eastward and southward. The east-west gradient of pCO_2 is larger than the north-south gradient. A positive relationship between pCO_2 and sea surface temperature (SST) was observed in the open water region; the rate of change was 0.06℃^<-1>. This rate cannot be explained only by the temperature dependence of CO_2 solubility in sea water because the observed rate is higher than that of the pure temperature effect. No relationship between pCO_2 and SST was found in the pack ice region. pCO_2 in the surface layer of the Greenland Sea was higher in April, followed by a dramatic decrease in mid-May. These lower values of pCO_2 were observed until the end of August. pCO_2 in the ocean surface layer was always lower than that in the atmosphere from April to August. The difference of pCO_2 between the atmosphere and the ocean was about 40 μatm in April and reached a maximum of about 190 μatm in mid-May. Therefore, the Greenland Sea seems to act as a strong sink for atmospheric CO_2,especially in summer. ΣCO_2 and δ^<13>C were vertically and latitudinally uniform below 200m depth in the Greenland Sea in August. The uniformity suggests strong vertical mixing of sea water. The mean values of ΣCO_2 and δ^<13>C below 200m were 2.13 mmol kg^<-1> and 1.2‰ respectively. ΣCO_2 and δ^<13>C above 200m depth had a linear relationship with a coefficient of -10‰ (mmol (kg)^<-1>)^<-1>, suggesting ΣCO_2 decrease caused by strong biological activity.

著者

張 紀久夫 阪大基:福井工大工
Yamanouchi Takashi National Institute of Polar Research
Ushio Shuki National Institute Of Polar Research
Morimoto S National Institute Of Polar Research Organization Of Information And Systems
Nakazawa Takakiyo Center for Atmospheric and Oceanic Studies, Tohoku University
ITO Hajime National Institute of Polar Research
ONO Nobuo National Institute of Polar Research
Aoki Shuhji Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University
Morimoto Shinji National Institute of Polar Research
Vinge Torgny Norwegian Polar Research Institute
Nakazawa Takakiyo Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Aoki Shuji Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Aoki Shuhji Center For Atmospheric And Oceanic Studies Faculty Of Science Tohoku University
Yamanouchi Takashi Geosystems Inc.
Yamanouchi Takashi National Institute For Polar Research
Morimoto S National Inst. Polar Res. Tokyo Jpn
清水 明 東大教養
Aoki Shuji Center For Atmospheric And Oceanic Studies Graduate School Of Sci. Tohoku Univ.
Aoki Shuhji Faculty Of Science Tohoku University
Aoki Syuji National Institute Of Polar Research
Mae S National Institute Of Polar Research Research Organization Of Information And Systems
Mae Shinji Department Of Applied Physics Hokkaido University
Nakazawa Takakiyo Center For Atmospheric And Oceanic Studies Graduate School Of Sci. Tohoku Univ.
Ono N National Institute Of Polar Research
Nakazawa Takakiyo Center For Atmospheric And Oceanic Studies Faculty Of Science
Yamanouchi T Graduate Univ. Advanced Studies Tokyo
清水 明 Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Nakazawa T Center For Atmospheric And Oceanic Studies Faculty Of Science
Yamanouchi Takashi National Inst. Of Polar Res. And Dep. Of Polar Sci. The Graduate Univ. For Advanced Studies 10-3 Mid
Yamanouchi Takashi National Institute Of Polar Research 10-3 Midoricho Tachikawa Tokyo Japan.
Ushio S National Institute Of Polar Research
Mae Shinji National Institute For Resources And Environment
Morimoto Shinji National Institute For Resources And Environment

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