Southern Ocean deep convection as a driver of Antarctic warming events

Joel Benjamin Pedro; T. Martin; Eric J. Steig; Markus Jochum; W. Park; Sune Olander Rasmussen

doi:10.1002/2016gl067861

Southern Ocean deep convection as a driver of Antarctic warming events

Joel Benjamin Pedro, T. Martin, Eric J. Steig, Markus Jochum, W. Park, Sune Olander Rasmussen

Is-, Klima- og Geofysik

25 Citationer (Scopus)

Abstract

Simulations with a free-running coupled climate model show that heat release associated with Southern Ocean deep convection variability can drive centennial-scale Antarctic temperature variations of up to 2.0°C. The mechanism involves three steps: Preconditioning: Heat accumulates at depth in the Southern Ocean; Convection onset: Wind and/or sea ice changes tip the buoyantly unstable system into the convective state; and Antarctic warming: Fast sea ice-albedo feedbacks (on annual-decadal time scales) and slow Southern Ocean frontal and sea surface temperature adjustments to convective heat release (on multidecadal-century time scales) drive an increase in atmospheric heat and moisture transport toward Antarctica. We discuss the potential of this mechanism to help drive and amplify climate variability as observed in Antarctic ice core records.

Originalsprog	Engelsk
Tidsskrift	Geophysical Research Letters
Vol/bind	43
Udgave nummer	5
Sider (fra-til)	2192-2199
ISSN	0094-8276
DOI	https://doi.org/10.1002/2016gl067861
Status	Udgivet - 16 mar. 2016

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Citationsformater

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title = "Southern Ocean deep convection as a driver of Antarctic warming events",

abstract = "Simulations with a free-running coupled climate model show that heat release associated with Southern Ocean deep convection variability can drive centennial-scale Antarctic temperature variations of up to 2.0°C. The mechanism involves three steps: Preconditioning: Heat accumulates at depth in the Southern Ocean; Convection onset: Wind and/or sea ice changes tip the buoyantly unstable system into the convective state; and Antarctic warming: Fast sea ice-albedo feedbacks (on annual-decadal time scales) and slow Southern Ocean frontal and sea surface temperature adjustments to convective heat release (on multidecadal-century time scales) drive an increase in atmospheric heat and moisture transport toward Antarctica. We discuss the potential of this mechanism to help drive and amplify climate variability as observed in Antarctic ice core records.",

author = "Pedro, {Joel Benjamin} and T. Martin and Steig, {Eric J.} and Markus Jochum and W. Park and Rasmussen, {Sune Olander}",

year = "2016",

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doi = "10.1002/2016gl067861",

language = "English",

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journal = "Geophysical Research Letters",

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T1 - Southern Ocean deep convection as a driver of Antarctic warming events

AU - Pedro, Joel Benjamin

AU - Martin, T.

AU - Steig, Eric J.

AU - Jochum, Markus

AU - Park, W.

AU - Rasmussen, Sune Olander

PY - 2016/3/16

Y1 - 2016/3/16

N2 - Simulations with a free-running coupled climate model show that heat release associated with Southern Ocean deep convection variability can drive centennial-scale Antarctic temperature variations of up to 2.0°C. The mechanism involves three steps: Preconditioning: Heat accumulates at depth in the Southern Ocean; Convection onset: Wind and/or sea ice changes tip the buoyantly unstable system into the convective state; and Antarctic warming: Fast sea ice-albedo feedbacks (on annual-decadal time scales) and slow Southern Ocean frontal and sea surface temperature adjustments to convective heat release (on multidecadal-century time scales) drive an increase in atmospheric heat and moisture transport toward Antarctica. We discuss the potential of this mechanism to help drive and amplify climate variability as observed in Antarctic ice core records.

AB - Simulations with a free-running coupled climate model show that heat release associated with Southern Ocean deep convection variability can drive centennial-scale Antarctic temperature variations of up to 2.0°C. The mechanism involves three steps: Preconditioning: Heat accumulates at depth in the Southern Ocean; Convection onset: Wind and/or sea ice changes tip the buoyantly unstable system into the convective state; and Antarctic warming: Fast sea ice-albedo feedbacks (on annual-decadal time scales) and slow Southern Ocean frontal and sea surface temperature adjustments to convective heat release (on multidecadal-century time scales) drive an increase in atmospheric heat and moisture transport toward Antarctica. We discuss the potential of this mechanism to help drive and amplify climate variability as observed in Antarctic ice core records.

U2 - 10.1002/2016gl067861

DO - 10.1002/2016gl067861

M3 - Journal article

SN - 0094-8276

VL - 43

SP - 2192

EP - 2199

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 5

ER -

Southern Ocean deep convection as a driver of Antarctic warming events

Abstract

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