Temperature domination of AMOC weakening due to freshwater hosing in two GCMs

Haskins, Rosalind; Oliver, Kevin I. C.; Jackson, Laura; Wood, Richard; Drijfhout, Sybren

doi:10.1007/s00382-019-04998-5

Cited by 32 publications

(23 citation statements)

References 31 publications

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“…211 Afterward, the AMOC strength started to rapidly recover. As described in the previous 212 studies 15,43,45 , the AMOC exhibits a clear hysteresis behavior, and such behavior has critical influences on the ITCZ changes due to the alterations in the hemispheric heat distribution.…”

Section: Irreversible Itcz Responses and Global Energy Exchangesmentioning

confidence: 67%

“…Figure 3c shows the AMOC response to the CO2 ramp-up and -down forcing. With 206 the increase in CO2, the overturning circulation was gradually weakened due to the freshening of the Arctic sea-ice decline 42 , the buoyant surface cap 43 , and surface hydrology change 44 . After the CO2 turnabout, the AMOC strength further weakened and reached its minimum value in about Year 2200, namely the AMOC overshooting (Extended Data Fig.…”

Section: Irreversible Itcz Responses and Global Energy Exchangesmentioning

confidence: 99%

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Irreversible Response of the Intertropical Convergence Zone (ITCZ) to CO2 Forcing

Kug

et al. 2021

Preprint

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With the unprecedented rate of global warming in this century, whether or not human-made climate change is irreversible is the most critical question. Based on idealized CO2 ramp-up and -down experiments, we show here that the intertropical convergence zone (ITCZ) exhibits irreversible changes. While the ITCZ location does not change much during the CO2 increasing period, the ITCZ sharply moves south as soon as CO2 begins to decrease, and its center eventually resides in the Southern Hemisphere. The pattern of the irreversible precipitation changes manifests a permanent extreme El Nino-like pattern, which has distinctive impacts on the global hydrological cycle. It was revealed that the hysteresis behavior of the Atlantic meridional overturning circulation and the delayed energy exchanges between the tropics and extratropics are responsible for the peculiar evolution of the hemispheric temperature contrast, leading to irreversible ITCZ changes.

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Section: Irreversible Itcz Responses and Global Energy Exchangesmentioning

confidence: 67%

Section: Irreversible Itcz Responses and Global Energy Exchangesmentioning

confidence: 99%

Irreversible Response of the Intertropical Convergence Zone (ITCZ) to CO2 Forcing

Kug

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…However, the amplitude of each component may vary with intrinsic or extrinsic factors. Cycle lengths on potentially intermediate time scales ≈1000 years have been discussed by Haskins et al [20] Cycle lengths on paleontological time scales have been identified by Imbrie et al [21] and others.…”

Section: Ocean Cyclesmentioning

confidence: 93%

A Review of Ocean Dynamics in the North Atlantic: Achievements and Challenges

Seip

2020

Climate

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I address 12 issues related to the study of ocean dynamics and its impact on global temperature change, regional and local climate change, and on the North Atlantic ecosystem. I outline the present achievements and challenges that lie ahead. I start with observations and methods to extend the observations of ocean oscillations over time and end with challenges to find connections between ocean dynamics in the North Atlantic and dynamics in other parts of the globe.

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“…Reduction of AMOC due to freshwater input from Greenland is also observed in idealized experiments, i.e., common freshwater hosing experiments (e.g., Haskins et al 2020;Swingedouw et al 2012Swingedouw et al , 2014. These experiments are usually performed with a much stronger, unrealistic freshwater input to kick the AMOC response.…”

Section: The Oceanic Responsementioning

confidence: 96%

The role of an interactive Greenland ice sheet in the coupled climate-ice sheet model EC-Earth-PISM

et al. 2022

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Ice sheet processes are often simplified in global climate models as changes in ice sheets have been assumed to occur over long time scales compared to ocean and atmospheric changes. However, numerous observations show an increasing rate of mass loss from the Greenland Ice Sheet and call for comprehensive process-based models to explore its role in climate change. Here, we present a new model system, EC-Earth-PISM, that includes an interactive Greenland Ice Sheet. The model is based on the EC-Earth v2.3 global climate model in which ice sheet surface processes are introduced. This model interacts with the Parallel Ice Sheet Model (PISM) without anomaly or flux corrections. Under pre-industrial climate conditions, the modeled climate and ice sheet are stable while keeping a realistic interannual variability. In model simulations forced into a warmer climate of four times the pre-industrial CO2 concentration, the total surface mass balance decreases and the ice sheet loses mass at a rate of about 500 Gt/year. In the climate warming experiments, the resulting freshwater flux from the Greenland Ice Sheet increases 55% more in the experiments with the interactive ice sheet and the climate response is significantly different: the Arctic near-surface air temperature is lower, substantially more winter sea ice covers the northern hemisphere, and the ocean circulation is weaker. Our results indicate that the melt-albedo feedback plays a key role for the response of the ice sheet and its influence on the changing climate in the Arctic. This emphasizes the importance of including interactive ice sheets in climate change projections.

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Temperature domination of AMOC weakening due to freshwater hosing in two GCMs

Cited by 32 publications

References 31 publications

Irreversible Response of the Intertropical Convergence Zone (ITCZ) to CO2 Forcing

Irreversible Response of the Intertropical Convergence Zone (ITCZ) to CO2 Forcing

A Review of Ocean Dynamics in the North Atlantic: Achievements and Challenges

The role of an interactive Greenland ice sheet in the coupled climate-ice sheet model EC-Earth-PISM

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