研究人员使用地球系统模型，证明减缓的经向翻转循环减少了溶解度碳泵的人为碳泵吸收，增加了可生物泵的碳和营养物的深海储存。净效应减少了海洋对认为二氧化碳的吸收。随时间推移，深海养分封存将日益抑制全球范围的海洋净初级生产力。经向翻转循环的减缓代表了一种正反馈，这种正反馈可能会在几个世纪的时间尺度上延长或强化气候暖峰条件。
据了解，目前的地球模型(ESMs)预测，在一系列气候状况下，大西洋经向翻转循环和南部经向翻转循环(SMOC)将急剧减速(到2100年减缓28-42％)到2300年SMOC可能完全关闭。减缓经向翻转循环(MOC)对海洋生物和可溶性碳泵的影响不同，对海洋碳吸收的净影响力也不确定。
附：英文原文
Title: Reduced CO2 uptake and growing nutrient sequestration from slowing overturning circulation
Author: Liu, Y., Moore, J. K., Primeau, F., Wang, W. L.
Issue&Volume: 2022-12-22
Abstract: Current Earth system models (ESMs) project dramatic slowing (28–42% by 2100) of Atlantic Meridional Overturning Circulation and Southern Meridional Overturning Circulation (SMOC) across a range of climate scenarios, with a complete shutdown of SMOC possible by year 2300. Slowing meridional overturning circulation (MOC) differentially impacts the ocean biological and solubility carbon pumps, leaving the net impact on ocean carbon uptake uncertain. Here using a suite of ESMs, we show that slowing MOC reduces anthropogenic carbon uptake by the solubility pump but increases deep-ocean storage of carbon and nutrients by the biological pump. The net effect reduces ocean uptake of anthropogenic CO2. The deep-ocean nutrient sequestration will increasingly depress global-scale, marine net primary production over time. MOC slowdown represents a positive feedback that could extend or intensify peak-warmth climate conditions on multi-century timescales.
DOI: 10.1038/s41558-022-01555-7
Source: https://www.nature.com/articles/s41558-022-01555-7