2025-12-05 マックス・プランク研究所
＜関連情報＞
- https://www.mpg.de/25703609/how-to-make-model-experiments-on-the-atlantic-overturning-circulation-more-realistic
- https://www.sciencedirect.com/science/article/pii/S1463500325001027?via%3Dihub
海洋淡水輸送を研究するための新しい枠組みと、グリーンランド沿岸周辺の淡水の運命モデルを判別するためのその応用 A novel framework for studying oceanic freshwater transports, and its application in discerning the modelled fate of freshwater around the coast of Greenland
Fraser William Goldsworth
Ocean Modelling Available online: 1 September 2025
DOI:https://doi.org/10.1016/j.ocemod.2025.102599
Highlights
- I describe the freshwater transformation framework.
- I quantify modelled rates of diahaline mixing around Greenland.
- I link salinification of boundary currents to surface processes and interior mixing.
- Diahaline mixing rates are stronger during wintertime than summertime.
- Diahaline mixing rates are weaker in areas with high sea-ice cover.
Abstract
In the sub-polar North Atlantic, the accumulation of fresh meltwaters from Greenland and the Arctic can impact the strength of the climatically important Atlantic Meridional Overturning Circulation. In this study I investigate and map out the processes that contribute to the accumulation of freshwater in four different regions around Greenland, quantifying horizontal transports of freshwater and the expansion and depletion of freshwater reservoirs by surface sources and interior mixing. Rather than using traditional freshwater budgets, whose flaws are well documented, I propose the novel use of the freshwater transformation framework and apply it to outputs from an eddy resolving coupled climate model (10 km atmosphere and 5 km ocean).
Analysing volume transports in salinity space we observe the salinification of the boundary currents surrounding Greenland as they flow from Fram Strait towards the Labrador Sea. Using the freshwater transformation framework we are able to link the salinification to mixing, sea-ice formation or the accumulation of freshwaters stored in the waters surrounding Greenland. The balance changes depending upon the region and season under question. The mixing of freshwaters is found to be stronger during wintertime than in summertime. Furthermore, mixing plays a more dominant role in the freshwater transformation budget off Southern Greenland, where sea-ice cover is low, than off Northern Greenland, where sea-ice cover is high.
