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Aspects of the Atlantic sector Deep MOC in recent GO-SHIP sections Brian King

Aspects of the Atlantic sector Deep MOC in recent GO-SHIP sections Brian King With contributions from Chris Atkinson Harry Bryden Eleanor Frajka-Williams. Jan 1997/8. Nov 1993/4. Nov 1996/7. Nov 1994/5. Nov 2001/2. Feb 1999/0. Nov 2000/1. Dec 2002/3. Dec 2003/4. Dec 2004/5.

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Aspects of the Atlantic sector Deep MOC in recent GO-SHIP sections Brian King

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  1. Aspects of the Atlantic sector Deep MOC in recent GO-SHIP sections Brian King With contributions from Chris Atkinson Harry Bryden Eleanor Frajka-Williams

  2. Jan 1997/8 Nov 1993/4 Nov 1996/7 Nov 1994/5 Nov 2001/2 Feb 1999/0 Nov 2000/1 Dec 2002/3 Dec 2003/4 Dec 2004/5 Dec 2005/6 Dec 2006/7 PotentialTemperature Dec 2007/8 Dec 2008/9 Feb 2008/9

  3. Bimodal location of Polar Front. Exception is 2005/06

  4. 0.2 PW

  5. Temperature and strength of Antarctic Circumpolar Currentat Drake Passage, 1993-2009

  6. 3 February 2009, Punta Arenas, Chile3 March 2009, Montevideo, Uruguay RRS James Cook Cruise 31 7 March 2009, Montevideo, Uruguay21 April 2009, Walvis Bay, Namibia RRS James Cook Cruise 32 I6 Feb ‘08

  7. JC032 24°S potential temperature

  8. 24°S AABW analysis (H Bryden) Comparing JC032 (2010) with Oceanus 133 (1983) Single reference level calculation Northwards flow of coldest water <0.9°C West East Total 2.30 Sv -1.72 0.57 JC032 3.45 Sv -3.49 -0.04 OC133 <0.7°C West East Total 2.32 Sv -0.89 1.43 JC032 2.99 Sv -2.87 0.12 OC133

  9. RRS Discovery Cruise 346 5 Jan 2010, Freeport Bahamas to 19 Feb 2010, Lisbon, Portugal D346 Cruise Track and Station positions

  10. 1981 minus 2010 C. Atkinson Changes in water mass properties on isopycnal surfaces at the western boundary at 24°N. A comparison of 1981 hydrographic cruise data with 2010 cruise data is shown. Changes in potential temperature (left, deg. C) and salinity (right) are shown for the upper and deep ocean (note change in contour scaling). The anomalous cold and fresh water seen at the surface layers of the upper ocean is the result of a Gulf Stream eddy measured during the 2010 cruise. Cooling and freshening of the deep waters (2010 relative to 1981) has occurred over much of the western basin at 24°N.

  11. Deep Western Boundary Current C. Atkinson Difference: Year minus 2010 S T Changes in water mass properties on isopycnal surfaces in the DWBC at 24°N. Potential temperature (left) and salinity (right) properties are averaged over the longitudinal range 77°W to 70°W. Changes for five previous hydrographic cruises relative to 2010 data are shown. Dotted lines shows ± 1 std. dev. of properties as derived from four years of RAPID-MOC/MOCHA measurements at mooring WB3. Note change of scale in upper and lower plots.

  12. Deep Western Boundary Current C. Atkinson Changes in DWBC water mass properties at 24°N observed by six hydrographic cruises over the past 5 decades. Properties are averaged over the longitudinal range 77°W to 70°W.

  13. Eleanor Frajka-Williams, NOC: analysis of 2010 cruise data

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