在 1950 至 1985 年期间，人为气溶胶效应，在驱动密度表面的盐度变化方面超过了温室气体效应，而在 1985 年之后，温室气体效应占主导地位。这些地下水团的变化可追溯到表层的变化，其中约 70 %来自表层露头密度的迁移，由于人为气溶胶的区域冷却而向赤道移动，随后由于温室气体的变暖而向极地移动。
海洋俯冲将这些表层露头变化与主温跃层联系起来。观测和模拟都揭示了 1985 年前后，气候作用力的这种转变，并强调了人为气溶胶气候作用力对海洋水团的重要作用。
据研究人员介绍，模拟的北太平洋温跃层次表层和表层的水团变化，揭示了过去 60 年人为气溶胶（AAs）和温室气体（GHGs）之间竞争的影响。
附：英文原文
Title: The competition between anthropogenic aerosol and greenhouse gas climate forcing is revealed by North Pacific water-mass changes
Author: Jia-Rui Shi, Susan E. Wijffels, Young-Oh Kwon, Lynne D. Talley, Sarah T. Gille
Issue&Volume: 2023-09-20
Abstract: 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.
DOI: adh7746
Source: https://www.science.org/doi/10.1126/sciadv.adh7746