Deep ocean heat content changes estimated from observation and reanalysis product and their influence on sea level change

Edited: 2011-05-05
TitleDeep ocean heat content changes estimated from observation and reanalysis product and their influence on sea level change
Publication TypeJournal Article
Year of Publication2011
AuthorsKouketsu, S., T. Doi, T. Kawano, S. Masuda, N. Sugiura, Y. Sasaki, T. Toyoda, H. Igarashi, Y. Kawai, K. Katsumata, H. Uchida, M. Fukasawa, and T. Awaji
JournalJournal of Geophysical Research
Volume116
IssueC3
Date Published03/2011
ISSN0148-0227
Keywordssea_level, steric
Abstract

We calculated basin-scale and global ocean decadal temperature change rates from the 1990s to the 2000s for waters below 3000 m. Large temperature increases were detected around Antarctica, and a relatively large temperature increase was detected along the northward path of Circumpolar Deep Water in the Pacific. The global heat content (HC) change estimated from the temperature change rates below 3000 m was 0.8 × 1022 J decade−1; a value that cannot be neglected for precise estimation of the global heat balance. We reproduced the observed temperature changes in the deep ocean using a data assimilation system and examined virtual observations in the reproduced data field to evaluate the uncertainty of the HC changes estimated from the actual temporally and spatially sparse observations. From the analysis of the virtual observations, it is shown that the global HC increase below 3000 m during recent decades can be detected using the available observation system of periodic revisits to the same sampling sections, although the uncertainty is large.

DOI10.1029/2010JC006464
Short TitleJ. Geophys. Res.