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Seasonal and Inter-Annual Variations in pCO2sea and Air-Sea CO2 Fluxes in Mid-Latitudes of the Western and Eastern North Pacific during 1999-2006 : Recent Results Utilizing Voluntary Observation Ships

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Title: Seasonal and Inter-Annual Variations in pCO2sea and Air-Sea CO2 Fluxes in Mid-Latitudes of the Western and Eastern North Pacific during 1999-2006 : Recent Results Utilizing Voluntary Observation Ships
Authors: Takamura, Tomomi Ryu Browse this author
Inoue, Hisayuki Yoshikawa Browse this author
Midorikawa, Takashi Browse this author
Ishii, Masao Browse this author
Nojiri, Yukihiro Browse this author
Issue Date: Dec-2010
Publisher: Meteorological Society of Japan
Journal Title: Journal of the Meteorological Society of Japan
Volume: 88
Issue: 6
Start Page: 883
End Page: 898
Publisher DOI: 10.2151/jmsj.2010-602
Abstract: We have investigated the seasonal and inter-annual variations of the difference in partial pressure of CO2 between surface seawater (pCO2sea) and overlying air (pCO2air) and the air-sea CO2 flux in the mid-latitudes of the western North Pacific (WNP; 25-40°N, 140-170°E) and eastern North Pacific (ENP; 25-40°N, 120-150°W) from 1999 to 2006 using the latest voluntary observation ship data. In the WNP and ENP, the area-averaged ΔpCO2 (pCO2air - pCO2sea) was at its minimum in late summer (-4.6 to 6.7 μatm in the WNP and -32.5 to -20.5 μatm in the ENP) and at its maximum in late winter (51.0 to 59.8 μatm in the WNP and 35.1 to 46.2 μatm in the ENP). The WNP acts as a moderate sink for atmospheric CO2 (4.1 to 5.5 mmol m^[-2] d^[-1]), while the ENP acts as a weak sink (1.1 to 1.9 mmol m^[-2] d^[-1]). Because ΔpCO2 is mainly controlled by pCO2sea, we have evaluated the effect of the factors controlling pCO2sea : sea surface temperature (SST), salinity (SSS), dissolved inorganic carbon (TCO2), and total alkalinity (AT). In the WNP, not only SST but also TCO2 plays an important role in the seasonal pCO2sea variation, while the SST could only explain most of the pCO2sea variation in the ENP. From 1999 to 2006, pCO2sea increased at a significantly lower rate (0.53±0.11 μatm yr^[-1]) than pCO2air (1.81±0.01 μatm yr^[-1]) in the WNP, and at a slightly lower rate in the ENP (1.32±0.16 μatm yr^[-1]). The air-sea CO2 flux increased at a rate of 0.19±0.05 mmol m^[-2] d^[-1] yr^[-1] in the WNP and 0.09±0.03 mmol m^[-2] d^[-1] yr^[-1] in the ENP, suggesting that the WNP is a stronger sink for atmospheric CO2.
Type: article
URI: http://hdl.handle.net/2115/46939
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 吉川 久幸

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