Equilibrium thermal response timescale of global oceans

The equilibrium response timescale of global oceans is estimated in a fully coupled climate model. In general, the equilibrium timescale increases with depth, except in the polar region. The timescale is approximately 200 years for the ocean for depths above 1 km, and it increases to 1500 years at a...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Yang, Haijun, Zhu, Jiang
Other Authors: Yang, HJ (reprint author), Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, 209 Chengfu Rd, Beijing 100871, Peoples R China., Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Beijing 100871, Peoples R China., Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, 209 Chengfu Rd, Beijing 100871, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: geophysical research letters 2011
Subjects:
COUPLED CLIMATE MODEL
THERMOHALINE CIRCULATION
ATMOSPHERIC CO2
NORTH-ATLANTIC
LONG
Pacific
North Atlantic
Online Access:https://hdl.handle.net/20.500.11897/148550
https://doi.org/10.1029/2011GL048076
Description
Summary:The equilibrium response timescale of global oceans is estimated in a fully coupled climate model. In general, the equilibrium timescale increases with depth, except in the polar region. The timescale is approximately 200 years for the ocean for depths above 1 km, and it increases to 1500 years at a depth of 3 km. A layer with a rapid timescale change, referred to as a temporacline, is located at a depth of 1.5-2 km, which is analogous to the permanent thermocline in the ocean. The equilibrium timescale varies with the sign of the change in radiative forcing. The ocean response to surface cooling could be twice as fast as the surface warming because of enhanced vertical mixing, convection and overturning circulation. However, this phenomenon only occurs below the Atlantic temporacline. For the Atlantic upper ocean, the timescale is longer in the cooling case because of the readjustment of the upper ocean to the enhanced Atlantic overturning circulation. In the Pacific, the timescale change in the warming and cooling cases is not as significant as in the Atlantic because of the lack of deep convection. Citation: Yang, H., and J. Zhu (2011), Equilibrium thermal response timescale of global oceans, Geophys. Res. Lett., 38, L14711, doi:10.1029/2011GL048076. Geosciences, Multidisciplinary SCI(E) EI 3 ARTICLE 14 null 38

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