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Upper ocean mixing processes and their impact on the mixed layer heat balance during the onset of the Atlantic Cold Tongue

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Helmholtz-Zentrum für Ozeanforschung Kiel (Arial 45 pt) Upper ocean mixing processes and their impact on the mixed layer heat balance during the onset of the Atlantic Cold Tongue. Dengler et al., TAV/PIRATA 17 Meeting, Sept. 11 2012, Kiel In cooperation with:  M. McPhaden and P. Freitag  B. Bourlès  P. Brandt, S. Thomsen, G. Krahmann, T. Fischer and R. Hummels Marcus Dengler GEOMAR, Kiel, Germany • loosely-tethered microstructure profiles (>2000) were collected during many cruises to the tropical Atlantic in the past 7 years • data allowed to quantify  spatial and temporal variability of mixing  regional and seasonal averages of turbulent heat flux divergences. • sampling strategy implied  few repeat profiles at a single location  short time series (max ~ 1 day) • data set was not adequate for understanding mixing process Dengler et al., TAV/PIRATA 17 Meeting, Sept. 11 2012, Kiel Motivation Loosely - tethered microstructure measurements (2005-2008) Mixed layer heat budget at 10°W MicroRider: microstructure probe (Rockland Scientific) with sensors • 2 shear • 2 fast temperature • pressure • 3-D accelerometer data rate recorded at 512 Hz Glider measures additionally: • salinity • oxygen • chlorophyll • Turbidity Power of MicroRider is supplied by Glider (consumption: 625mW at 5V), Sampling (on/off) is controlled by Glider Dengler et al., TAV/PIRATA 17 Meeting, Sept. 11 2012, Kiel MicroRider / Glider Package MicroRider sensors First results: System performance: • low noise level (~1x10-10 W/kg) • autonomous measurements of up to 5 weeks possible • Glider movements in elevated oceanic turbulence is comparable to that of an airplane in well developed atmospheric turbulence Turbulence Measurements on Gliders Altogether, 3 MicroRider/Glider time series

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