Institut de Recherche pour le Développement (IRD), Sorbonne Universités (UPMC Université Paris 06, CNRS, MNHN), UMR LOCEAN/IPSL, IRD DR Ile-de-France, 32 Avenue Henri Varagnat, F-93143, Bondy, France.
Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Bât. 12, Avenue de la Terrasse, F-91198, Gif-sur-Yvette, France.
Nat Commun. 2018 Jun 29;9(1):2543. doi: 10.1038/s41467-018-04922-1.
Increasing atmospheric CO from man-made climate change is reducing surface ocean pH. Due to limited instrumental measurements and historical pH records in the world's oceans, seawater pH variability at the decadal and centennial scale remains largely unknown and requires documentation. Here we present evidence of striking secular trends of decreasing pH since the late nineteenth century with pronounced interannual to decadal-interdecadal pH variability in the South Pacific Ocean from 1689 to 2011 CE. High-amplitude oceanic pH changes, likely related to atmospheric CO uptake and seawater dissolved inorganic carbon fluctuations, reveal a coupled relationship to sea surface temperature variations and highlight the marked influence of El Niño/Southern Oscillation and Interdecadal Pacific Oscillation. We suggest changing surface winds strength and zonal advection processes as the main drivers responsible for regional pH variability up to 1881 CE, followed by the prominent role of anthropogenic CO in accelerating the process of ocean acidification.
人为气候变化导致大气 CO2 增加，正在降低表层海洋 pH 值。由于全球海洋中仪器测量和历史 pH 值记录有限，因此，在十年和百年尺度上的海水 pH 值变化在很大程度上仍然未知，需要加以记录。本研究提供了自 19 世纪末以来 pH 值显著下降的长期趋势的证据，在 1689 年至 2011 年 CE 年间，南太平洋的 pH 值呈现出显著的年际到十年到十年间的变化。海洋 pH 值的高幅度变化可能与大气 CO2 吸收和海水溶解无机碳波动有关，这表明与海表温度变化存在耦合关系，并突出了厄尔尼诺/南方涛动和太平洋十年际振荡的显著影响。我们认为，改变表层风强度和纬向平流过程是导致 1881 CE 年之前区域 pH 值变化的主要驱动力，随后人为 CO2 的显著作用加速了海洋酸化过程。
