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Title: The Active Role of the Ocean in the Temporal Evolution of Climate Sensitivity

Abstract

Here, the temporal evolution of the effective climate sensitivity is shown to be influenced by the changing pattern of sea surface temperature (SST) and ocean heat uptake (OHU), which in turn have been attributed to ocean circulation changes. A set of novel experiments are performed to isolate the active role of the ocean by comparing a fully coupled CO 2 quadrupling community Earth System Model (CESM) simulation against a partially coupled one, where the effect of the ocean circulation change and its impact on surface fluxes are disabled. The active OHU is responsible for the reduced effective climate sensitivity and weaker surface warming response in the fully coupled simulation. The passive OHU excites qualitatively similar feedbacks to CO 2 quadrupling in a slab ocean model configuration due to the similar SST spatial pattern response in both experiments. Additionally, the nonunitary forcing efficacy of the active OHU (1.7) explains the very different net feedback parameters in the fully and partially coupled responses.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of China and National Lab. for Marine Science and Technology, Qinqdao (China)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1420443
Alternate Identifier(s):
OSTI ID: 1421323; OSTI ID: 1464415
Report Number(s):
PNNL-SA-129309
Journal ID: ISSN 0094-8276; TRN: US1801497
Grant/Contract Number:  
AC05-76RL01830; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 1; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Climate sensitivity; Ocean heat uptake; Ocean circulation change; Radiative Feedbacks; Air-sea interactions; climate; ocean heat uptake; OHU; ocean; SST

Citation Formats

Garuba, Oluwayemi A., Lu, Jian, Liu, Fukai, and Singh, Hansi A. The Active Role of the Ocean in the Temporal Evolution of Climate Sensitivity. United States: N. p., 2017. Web. doi:10.1002/2017GL075633.
Garuba, Oluwayemi A., Lu, Jian, Liu, Fukai, & Singh, Hansi A. The Active Role of the Ocean in the Temporal Evolution of Climate Sensitivity. United States. doi:10.1002/2017GL075633.
Garuba, Oluwayemi A., Lu, Jian, Liu, Fukai, and Singh, Hansi A. Thu . "The Active Role of the Ocean in the Temporal Evolution of Climate Sensitivity". United States. doi:10.1002/2017GL075633. https://www.osti.gov/servlets/purl/1420443.
@article{osti_1420443,
title = {The Active Role of the Ocean in the Temporal Evolution of Climate Sensitivity},
author = {Garuba, Oluwayemi A. and Lu, Jian and Liu, Fukai and Singh, Hansi A.},
abstractNote = {Here, the temporal evolution of the effective climate sensitivity is shown to be influenced by the changing pattern of sea surface temperature (SST) and ocean heat uptake (OHU), which in turn have been attributed to ocean circulation changes. A set of novel experiments are performed to isolate the active role of the ocean by comparing a fully coupled CO2 quadrupling community Earth System Model (CESM) simulation against a partially coupled one, where the effect of the ocean circulation change and its impact on surface fluxes are disabled. The active OHU is responsible for the reduced effective climate sensitivity and weaker surface warming response in the fully coupled simulation. The passive OHU excites qualitatively similar feedbacks to CO2 quadrupling in a slab ocean model configuration due to the similar SST spatial pattern response in both experiments. Additionally, the nonunitary forcing efficacy of the active OHU (1.7) explains the very different net feedback parameters in the fully and partially coupled responses.},
doi = {10.1002/2017GL075633},
journal = {Geophysical Research Letters},
number = 1,
volume = 45,
place = {United States},
year = {2017},
month = {11}
}

Journal Article:
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Cited by: 7 works
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