Shi Jia-Rui, Wijffels Susan E, Kwon Young-Oh, Talley Lynne D, Gille Sarah T
Woods Hole Oceanographic Institution, Woods Hole, MA, USA.
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA.
Sci Adv. 2023 Sep 22;9(38):eadh7746. doi: 10.1126/sciadv.adh7746. Epub 2023 Sep 20.
Modeled water-mass changes in the North Pacific thermocline, both in the subsurface and at the surface, reveal the impact of the competition between anthropogenic aerosols (AAs) and greenhouse gases (GHGs) over the past 6 decades. The AA effect overwhelms the GHG effect during 1950-1985 in driving salinity changes on density surfaces, while after 1985 the GHG effect dominates. These subsurface water-mass changes are traced back to changes at the surface, of which ~70% stems from the migration of density surface outcrops, equatorward due to regional cooling by AAs and subsequent poleward due to warming by GHGs. Ocean subduction connects these surface outcrop changes to the main thermocline. Both observations and models reveal this transition in climate forcing around 1985 and highlight the important role of AA climate forcing on our oceans' water masses.
对北太平洋温跃层（包括次表层和表层）模拟的水体变化研究显示，在过去60年里，人为气溶胶（AA）和温室气体（GHG）之间的竞争产生了影响。在1950 - 1985年期间，AA效应在驱动密度面上的盐度变化方面超过了GHG效应，而在1985年之后，GHG效应占主导地位。这些次表层水体变化可追溯到表层变化，其中约70%源于密度面露头的迁移，先是因AA导致区域变冷而向赤道方向移动，随后又因GHG导致变暖而向极地方向移动。海洋俯冲将这些表层露头变化与主要温跃层联系起来。观测和模型均揭示了1985年左右气候强迫的这种转变，并凸显了AA气候强迫对海洋水体的重要作用。
