Publication Date:
2022-05-25
Description:
Author Posting. © American Meteorological Society, 2012. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 25 (2012): 1096–1115, doi:10.1175/2011JCLI4228.1.
Description:
Ventilation, including subduction and obduction, for the global oceans was examined using Simple Ocean Data Assimilation (SODA) outputs. The global subduction rate averaged over the period from 1959 to 2006 is estimated at 505.8 Sv (1 Sv ≡ 106 m3 s−1), while the corresponding global obduction rate is estimated at 482.1 Sv. The annual subduction/obduction rates vary greatly on the interannual and decadal time scales. The global subduction rate is estimated to have increased 7.6% over the past 50 years, while the obduction rate is estimated to have increased 9.8%. Such trends may be insignificant because errors associated with the data generated by ocean data assimilation could be as large as 10%. However, a major physical mechanism that induced these trends is primarily linked to changes in the Southern Ocean. While the Southern Ocean plays a key role in global subduction and obduction rates and their variability, both the Southern Ocean and equatorial regions are critically important sites of water mass formation/erosion.
Description:
This work was
supported by the Key State Basic Research Program
of China under Grant 2012CB417401, the National
Natural Science Foundation of China (Grants 40906007,
40890152), and the Open Foundation of Physical Oceanography
Laboratory, OUC, under Grant 200902.
Description:
2012-08-15
Keywords:
Decadal variability
;
Southern Ocean
;
Trends
;
Water masses
;
Convergence
;
Mixing
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
application/pdf
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