Spatial and temporal patterns of small-scale mixing in Drake Passage / Andrew F. Thompson, Sarah T. Gille, J.A. MacKinnon, Janet Sprintall.

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008 230402s2007####xx#a##|##|###|0||#0|eng#d
035 ## ‡aSPRI-179310
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245 00 ‡aSpatial and temporal patterns of small-scale mixing in Drake Passage /‡cAndrew F. Thompson, Sarah T. Gille, J.A. MacKinnon, Janet Sprintall.
260 ## ‡a[S.l.] :‡b[s.n.],‡c2007.
300 ## ‡ap. 572-592 :‡bill., diags., table.
500 ## ‡aJournal of Physical Oceanography. Vol. 37(3) :572-592 (2007).
520 3# ‡aAnalysis of temperature and salinity profiles obtained from Drake Passage between February 2002 and July 2005 is used to estimate turbulent diapycnal eddy diffusivities to depth of 1,000 m. Diffusivity estimates from inversions exceed those from vertical strain by factor of 3 over most of Drake Passage. Strong thermohaline intrusions characterize profiles obtained north of Polar Front (PF), whereas south of PF stratification is determined largely by salinity, and temperature is unstably stratified between 100- and 600-m depth. Turbulent diapycnal diffusivities in upper 400 m are greater north of PF, and decrease south of PF. North of PF diffusivities decay weakly with depth, whereas they increase with depth and peak near local temperature maximum south of PF. Meridional pattern in near-surface mixing corresponds to local maxima and minima of both wind stress and wind stress variance. Winter near-surface diffusivities are also larger north of PF. Wind-driven near-inertial waves, strong mesoscale eddy activity, and double-diffusive convection are suggested as possible factors contributing to observed mixing patterns.
650 07 ‡a551.46 -- Oceanography, physical.‡2udc
650 07 ‡a551.463 -- Sea water, physical properties.‡2udc
650 07 ‡a551.463.6 -- Sea water, thermal properties and heat flux.‡2udc
650 07 ‡a551.464.5 -- Salinity.‡2udc
650 07 ‡a551.465 -- Oceanography, dynamics.‡2udc
650 07 ‡a551.465.15 -- Turbulence and eddies.‡2udc
650 07 ‡a551.465.4 -- Oceanography, stratification.‡2udc
650 07 ‡aC -- Oceanography, hydrography and hydrology.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*80) -- Southern Ocean.‡2udc
651 #7 ‡a(*82) -- South Atlantic Ocean.‡2udc
651 #7 ‡a(*821) -- Drake Passage.‡2udc
700 1# ‡aThompson, Andrew F.
700 1# ‡aGille, Sarah T.
700 1# ‡aMacKinnon, J. A.
700 1# ‡aSprintall, Janet.
773 0# ‡7nnas ‡tJournal of Physical Oceanography. ‡gVol. 37(3) (2007) ‡wSPRI-78712
916 ## ‡a2007/07/27 -- HS
917 ## ‡aUnenhanced record from Muscat, imported 2019
948 3# ‡a20230402 ‡bHS