Direct observations of basin-wide acidification of the North Pacific Ocean
Direct observations of basin-wide acidification of the North Pacific Ocean
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DOI：
10.1029/2009gl040999
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发表时间：
2010-01-20
影响因子：
5.2
通讯作者：
Liu, Xuewu
中科院分区：
文献类型：
--
作者：
Byrne, Robert H.;Mecking, Sabine;Liu, Xuewu
全球海洋酸化是与大气二氧化碳水平上升相关的一个显著的、不可阻挡的变化。在这里，我们介绍了最近pH值下降的第一次全流域直接观测，以及对该信号的人为和非人为贡献的估计。沿着北太平洋西经152度(北纬22度-56度)，1991年至2006年间，在约800米深度以下，pH变化基本上为零。然而，在500米以上，观测到了显著的pH变化，最高可达-0.06。超过800米的人类活动和非人类活动的贡献估计是相似的。在表层混合层(深度接近100m)，pH的变化幅度与海水/大气平衡条件下的预期一致，平均变化速率为-0.0017/年。未来混合层的变化预计将密切反映大气二氧化碳的变化，随着大气二氧化碳的上升，表层海水的pH值继续下降。引用：Byrne，R.H.，S.Mecking，R.A.Feely和X.Liu(2010)，北太平洋盆地范围酸化的直接观测，地球物理。研究报告，37，L02601，DOI：10.1029/2009GL040999。
Global ocean acidification is a prominent, inexorable change associated with rising levels of atmospheric CO2. Here we present the first basin-wide direct observations of recently declining pH, along with estimates of anthropogenic and non-anthropogenic contributions to that signal. Along 152 degrees W in the North Pacific Ocean (22-56 degrees N), pH changes between 1991 and 2006 were essentially zero below about 800 m depth. However, in the upper 500 m, significant pH changes, as large as -0.06, were observed. Anthropogenic and non-anthropogenic contributions over the upper 800 m are estimated to be of similar magnitude. In the surface mixed layer (depths to similar to 100 m), the extent of pH change is consistent with that expected under conditions of seawater/atmosphere equilibration, with an average rate of change of -0.0017/yr. Future mixed layer changes can be expected to closely mirror changes in atmospheric CO2, with surface seawater pH continuing to fall as atmospheric CO2 rises. Citation: Byrne, R. H., S. Mecking, R. A. Feely, and X. Liu (2010), Direct observations of basin-wide acidification of the North Pacific Ocean, Geophys. Res. Lett., 37, L02601, doi: 10.1029/2009GL040999.