Observed and simulated full-depth ocean heat-content changes for 1970–2005

Cheng, Lijing; Trenberth, Kevin E.; Palmer, Matthew D.; Zhu, Jiang; Abraham, John P.

doi:10.5194/os-12-925-2016

Title: Observed and simulated full-depth ocean heat-content changes for 1970–2005

Journal Article · 26 July 2016 · Ocean Science

DOI: https://doi.org/10.5194/os-12-925-2016 · OSTI ID:1272636

Cheng, Lijing ^[1]; Trenberth, Kevin E. ^[2]; Palmer, Matthew D. ^[3]; Zhu, Jiang ^[1]; Abraham, John P. ^[4]

Chinese Academy of Sciences (CAS), Beijing (China)
National Center for Atmospheric Research, Boulder, CO (United States)
Met Office Hadley Centre, Exeter (United Kingdom)
Univ. of St. Thomas, St. Paul, MN (United States)

Here, greenhouse-gas emissions have created a planetary energy imbalance that is primarily manifested by increasing ocean heat content (OHC). Updated observational estimates of full-depth OHC change since 1970 are presented that account for recent advancements in reducing observation errors and biases. The full-depth OHC has increased by 0.74 [0.68, 0.80] × 10²² J yr^–1 (0.46 Wm^–2) and 1.22 [1.16–1.29] × 10²² J yr^–1 (0.75 Wm^–2) for 1970–2005 and 1992–2005, respectively, with a 5 to 95 % confidence interval of the median. The CMIP5 models show large spread in OHC changes, suggesting that some models are not state-of-the-art and require further improvements. However, the ensemble median has excellent agreement with our observational estimate: 0.68 [0.54–0.82] × 10²² J yr^–1 (0.42 Wm^–2) from 1970 to 2005 and 1.25 [1.10–1.41] × 10²² J yr^–1 (0.77 Wm^–2) from 1992 to 2005. These results increase confidence in both the observational and model estimates to quantify and study changes in Earth's energy imbalance over the historical period. We suggest that OHC be a fundamental metric for climate model validation and evaluation, especially for forced changes (decadal timescales).

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Research Organization:: University Corporation for Atmospheric Research (UCAR), Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: SC0012711

OSTI ID:: 1272636

Alternate ID(s):: OSTI ID: 1363635

Journal Information:: Ocean Science, Vol. 12, Issue 4; ISSN 1812-0792

Publisher:: Copernicus GmbHCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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