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Record #179577:

Circumpolar deep water circulation and variability in a coupled climate model / Agus Santoso, Matthew H. England, Anthony C. Hirst.

Title: Circumpolar deep water circulation and variability in a coupled climate model / Agus Santoso, Matthew H. England, Anthony C. Hirst.
Author(s): Santoso, Agus.
England, Matthew H.
Hirst, Anthony C.
Date: 2006.
In: Journal of Physical Oceanography. (2006.), Vol. 36(8) (2006)
Abstract: Uses long-term integration of coupled climate model to analyze natural variability of circumpolar deep water (CDW) which is decomposed into three separate modes accounting for 68% and 82% of total variance in upper and lower CDW layers respectively. First mode exhibits interbasin-scale variability on multicentennial time scales, originating in North Atlantic and flowing southward into Southern Ocean via North Atlantic deep water (NADW). Saline dipole anomalies appear to propagate around Atlantic meridional overturning circulation on these time scales with strengthening and weakening of NADW formation. Anomaly propagated northward from midlatitude subsurface of South Atlantic and sinks in North Atlantic before flowing southward along CDW isopycnal layers, suggesting interhemispheric connection in generation of first CDW variability mode. Second mode shows localized \theta-S variability in Brazil-Malians confluence zone on multidecadal to centennial time scales. Heat and salt budget analyses reveal that variability is controlled by meridional advection driven by fluct8ations in strength of deep western boundary and Malvinas currents. Third mode suggests Antarctic intermediate water source in South Pacific contributing to variability in upper CDW, and also that NADW formation is mainly buoyancy driven on time scales resolved with only weak connection with southern hemisphere winds, though southern hemisphere winds have more direct influence on rate of NADW outflow into Southern Ocean.
Notes:

Journal of Physical Oceanography. Vol. 36(8) :1523-1552 (2006).

Keywords: 551.46 -- Oceanography, physical.
551.465 -- Oceanography, dynamics.
551.465.4 -- Oceanography, stratification.
551.465.45 -- Water masses.
551.465.5 -- Ocean currents.
519.673 -- Modelling.
C -- Oceanography, hydrography and hydrology.
(*7) -- Antarctic regions.
(*80) -- Southern Ocean.
SPRI record no.: 179577

MARCXML

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100 1# ‡aSantoso, Agus.
245 10 ‡aCircumpolar deep water circulation and variability in a coupled climate model /‡cAgus Santoso, Matthew H. England, Anthony C. Hirst.
260 ## ‡a[S.l.] :‡b[s.n.],‡c2006.
300 ## ‡ap. 1523-1552 :‡bill., diags., tables.
500 ## ‡aJournal of Physical Oceanography. Vol. 36(8) :1523-1552 (2006).
520 3# ‡aUses long-term integration of coupled climate model to analyze natural variability of circumpolar deep water (CDW) which is decomposed into three separate modes accounting for 68% and 82% of total variance in upper and lower CDW layers respectively. First mode exhibits interbasin-scale variability on multicentennial time scales, originating in North Atlantic and flowing southward into Southern Ocean via North Atlantic deep water (NADW). Saline dipole anomalies appear to propagate around Atlantic meridional overturning circulation on these time scales with strengthening and weakening of NADW formation. Anomaly propagated northward from midlatitude subsurface of South Atlantic and sinks in North Atlantic before flowing southward along CDW isopycnal layers, suggesting interhemispheric connection in generation of first CDW variability mode. Second mode shows localized \theta-S variability in Brazil-Malians confluence zone on multidecadal to centennial time scales. Heat and salt budget analyses reveal that variability is controlled by meridional advection driven by fluct8ations in strength of deep western boundary and Malvinas currents. Third mode suggests Antarctic intermediate water source in South Pacific contributing to variability in upper CDW, and also that NADW formation is mainly buoyancy driven on time scales resolved with only weak connection with southern hemisphere winds, though southern hemisphere winds have more direct influence on rate of NADW outflow into Southern Ocean.
650 07 ‡a551.46 -- Oceanography, physical.‡2udc
650 07 ‡a551.465 -- Oceanography, dynamics.‡2udc
650 07 ‡a551.465.4 -- Oceanography, stratification.‡2udc
650 07 ‡a551.465.45 -- Water masses.‡2udc
650 07 ‡a551.465.5 -- Ocean currents.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aC -- Oceanography, hydrography and hydrology.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*80) -- Southern Ocean.‡2udc
700 1# ‡aEngland, Matthew H.
700 1# ‡aHirst, Anthony C.
773 0# ‡7nnas ‡tJournal of Physical Oceanography. ‡gVol. 36(8) (2006) ‡wSPRI-78712
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