A twenty year reversal in water mass trends in the subtropical North Atlantic

Details A twenty year reversal in water mass trends in the subtropical North Atlantic A twenty year reversal in water mass trends in the subtropical North Atlantic

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3412608l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 12, CiteID L12608

Physics

12

Oceanography: General: Physical And Chemical Properties Of Seawater, Oceanography: General: Upwelling And Convergences (4964), Oceanography: General: Water Masses, Oceanography: Physical: Decadal Ocean Variability (1616, 1635, 3305, 4215), Oceanography: Physical: Hydrography And Tracers

Scientific paper

Temperature and salinity changes have been compared along three repeat sections at 36°N in the North Atlantic. The principal changes, cooling of the upper waters and warming of the intermediate waters observed between 1959 and 1981, were reversed between 1981 and 2005. The controlling mechanisms for the changes over the two time periods differed through the water column. Neutral density surfaces over the upper 800 m were firstly uplifted and secondly depressed by typically 50 m, which is broadly consistent with the changes in thermocline thickness implied by the temporal changes in Ekman pumping. In contrast, the intermediate waters (800-2500 m) firstly became warmer and saltier and secondly became cooler and fresher. This change in the intermediate waters was controlled by water mass changes along neutral density surfaces suggesting a change in the source waters, principally Labrador Sea Water and Mediterranean Outflow Water.

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