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Decreasing pH trend estimated from 25-yr time series of carbonate parameters in the western North Pacific

Abstract

We estimated long-term trends of ocean acidification in surface waters in latitudinal zones from 3 deg N to 33 deg N along the repeat hydrographic line at 137 deg E in the western North Pacific Ocean. Estimates were based on the observational records of oceanic CO{sub 2} partial pressure and related surface properties over the last two decades. The computed pH time series both for 25 yr in winter (late January to early February) and for 21 yr in summer (June-July) exhibited significant decreasing trends in the extensive subtropical to equatorial zones, with interannual variations that were larger in summer. The calculated rates of pH decrease ranged from 0.0015 to 0.0021 yr-1 (average, 0.0018 +- 0.0002 yr-1) in winter and from 0.0008 to 0.0019 yr-1 (average, 0.0013 +- 0.0005 yr-1 ) in summer. The thermodynamic effects of rising sea surface temperature (SST) accounted for up to 44% (average, 15%) of the trend of pH decrease in the subtropical region in winter, whereas a trend of decreasing SST slowed the pH decrease in the northern subtropical region (around 25 deg N) in summer. We used the results from recent trends to evaluate future possible thermodynamic changes in the upper ocean carbonate  More>>
Authors:
Midorikawa, Takashi; Ishii, Masao; Sasano, Daisuke; Kosugi, Naohiro; [1]  Saito, Shu; [2]  Institute of Observational Research for Global Change (IORGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka (Japan)); Motoi, Tatsuo; [3]  Kamiya, Hitomi; Nakadate, Akira; Nemoto, Kazuhiro; [4]  Inoue, Hisayuki Y [5] 
  1. Geochemical Research Dept., Meteorological Research Institute Tsukuba (Japan)
  2. Geochemical Research Dept., Meteorological Research Institute, Tsukuba (Japan)
  3. Oceanographic Research Dept., Meteorological Research Institute, Tsukuba (Japan)
  4. Global Environment and Marine Dept., Japan Meteorological Agency, Tokyo (Japan)
  5. Graduate School of Environmental Earth Science, Hokkaido Univ., Sapporo (Japan)
Publication Date:
Nov 15, 2010
Product Type:
Journal Article
Resource Relation:
Journal Name: Tellus, Series B: Chemical and Physical Meteorology; Journal Volume: 62B; Journal Issue: 5; Conference: ICDC8: 8. international carbon dioxide conference, Jena (Germany), 09/13/2009--09/19/2009; Other Information: Conference Literature; 25 refs., 9 figs., 1 tab.; 10.1111/J.1600-0889.2010.00474.X
Subject:
54 ENVIRONMENTAL SCIENCES; PH VALUE; PACIFIC OCEAN; ACIDIFICATION; CARBON DIOXIDE; SEASONAL VARIATIONS
OSTI ID:
1010798
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0280-6509; TRN: SE1107066
Availability:
Available from DOI: http://dx.doi.org/10.1111/j.1600-0889.2010.00474.x
Submitting Site:
SWD
Size:
page(s) 649-659
Announcement Date:
Apr 11, 2011

Citation Formats

Midorikawa, Takashi, Ishii, Masao, Sasano, Daisuke, Kosugi, Naohiro, Saito, Shu, Institute of Observational Research for Global Change (IORGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka (Japan)), Motoi, Tatsuo, Kamiya, Hitomi, Nakadate, Akira, Nemoto, Kazuhiro, and Inoue, Hisayuki Y. Decreasing pH trend estimated from 25-yr time series of carbonate parameters in the western North Pacific. Sweden: N. p., 2010. Web. doi:10.1111/J.1600-0889.2010.00474.X.
Midorikawa, Takashi, Ishii, Masao, Sasano, Daisuke, Kosugi, Naohiro, Saito, Shu, Institute of Observational Research for Global Change (IORGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka (Japan)), Motoi, Tatsuo, Kamiya, Hitomi, Nakadate, Akira, Nemoto, Kazuhiro, & Inoue, Hisayuki Y. Decreasing pH trend estimated from 25-yr time series of carbonate parameters in the western North Pacific. Sweden. doi:10.1111/J.1600-0889.2010.00474.X.
Midorikawa, Takashi, Ishii, Masao, Sasano, Daisuke, Kosugi, Naohiro, Saito, Shu, Institute of Observational Research for Global Change (IORGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka (Japan)), Motoi, Tatsuo, Kamiya, Hitomi, Nakadate, Akira, Nemoto, Kazuhiro, and Inoue, Hisayuki Y. 2010. "Decreasing pH trend estimated from 25-yr time series of carbonate parameters in the western North Pacific." Sweden. doi:10.1111/J.1600-0889.2010.00474.X. https://www.osti.gov/servlets/purl/10.1111/J.1600-0889.2010.00474.X.
@misc{etde_1010798,
title = {Decreasing pH trend estimated from 25-yr time series of carbonate parameters in the western North Pacific}
author = {Midorikawa, Takashi, Ishii, Masao, Sasano, Daisuke, Kosugi, Naohiro, Saito, Shu, Institute of Observational Research for Global Change (IORGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka (Japan)), Motoi, Tatsuo, Kamiya, Hitomi, Nakadate, Akira, Nemoto, Kazuhiro, and Inoue, Hisayuki Y}
abstractNote = {We estimated long-term trends of ocean acidification in surface waters in latitudinal zones from 3 deg N to 33 deg N along the repeat hydrographic line at 137 deg E in the western North Pacific Ocean. Estimates were based on the observational records of oceanic CO{sub 2} partial pressure and related surface properties over the last two decades. The computed pH time series both for 25 yr in winter (late January to early February) and for 21 yr in summer (June-July) exhibited significant decreasing trends in the extensive subtropical to equatorial zones, with interannual variations that were larger in summer. The calculated rates of pH decrease ranged from 0.0015 to 0.0021 yr-1 (average, 0.0018 +- 0.0002 yr-1) in winter and from 0.0008 to 0.0019 yr-1 (average, 0.0013 +- 0.0005 yr-1 ) in summer. The thermodynamic effects of rising sea surface temperature (SST) accounted for up to 44% (average, 15%) of the trend of pH decrease in the subtropical region in winter, whereas a trend of decreasing SST slowed the pH decrease in the northern subtropical region (around 25 deg N) in summer. We used the results from recent trends to evaluate future possible thermodynamic changes in the upper ocean carbonate system}
doi = {10.1111/J.1600-0889.2010.00474.X}
journal = {Tellus, Series B: Chemical and Physical Meteorology}
issue = {5}
volume = {62B}
place = {Sweden}
year = {2010}
month = {Nov}
}