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Recent deceleration of oceanic pCO2 increase in the western North Pacific in winter

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Title: Recent deceleration of oceanic pCO2 increase in the western North Pacific in winter
Authors: Midorikawa, Takashi Browse this author
Ishii, Masao Browse this author
Kosugi, Naohiro Browse this author
Sasano, Daisuke Browse this author
Nakano, Toshiya Browse this author
Saito, Shu Browse this author
Sakamoto, Naoaki Browse this author
Nakano, Hideyuki Browse this author
Inoue, Hisayuki Y. Browse this author →KAKEN DB
Issue Date: 19-Jun-2012
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 39
Start Page: L12601
Publisher DOI: 10.1029/2012GL051665
Abstract: Recent changes in oceanic CO2 partial pressure (pCO2^[sea]) have attracted increasing interest as they relate to the increase in atmospheric CO2 and climate change. We report decadal changes in the growth rates of pCO2^[sea] in latitudinal zones from 3°N to 33°N along the repeat hydrographic line at 137°E in the western North Pacific in winter. The growth rates of pCO2^[sea] for 1999-2009 (-0.3 ± 0.9 [mean ± 1σ] to 1.7 ± 0.5 μatm yr^[-1]) were lower than those for 1984-1997 (0.7 ± 0.3 to 2.2 ± 0.6 μatm yr^[-1]) at most latitudes, indicative of the recent notable deceleration of pCO2^[sea] increase. For latitudes around 10-20°N, we attribute the reduction in the growth rate of pCO2^[sea] for 1999-2009 primarily to the reduction in the contribution from dissolved inorganic carbon (DIC) originating from a reduction in carbon accumulation associated with the expansion of the western Subtropical Gyre towards the south.
Rights: ©2012 American Geophysical Union
Type: article
URI: http://hdl.handle.net/2115/50929
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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