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Ronski, Stephanie; Budéus, Gereon (2010): Physical oceanography during POLARSTERN cruise ARK-XVIII/1a. PANGAEA,, Supplement to: Ronski, S; Budéus, G (2005): Time series of winter convection in the Greenland Sea. Journal of Geophysical Research: Oceans, 110, C04015,

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In spite of the lack of bottom reaching convection in the Greenland Sea since the 1980s, convection continues to ventilate the Greenland Gyre down to intermediate depth. The variability of this ventilation activity is determined here annually for eight winters according to a multiple criteria catalogue, applied to annual summer conductivity-temperature-depth transects along 75°N. The comparison of the ventilation depths with the meteorological forcing, the ice cover, and the stratification of the water column shows the decisive influence of the hydrographic structure in the upper and intermediate layers. Ice, on the other hand, is not necessary for convection to occur. Ice formation does not even lead to particularly deep convection. A stability maximum, which currently dominates the vertical structure of the water column at medium depth, limits the ventilation depths effectively.
Related to:
Lemke, Peter (2003): The Expedition ARKTIS XVIII/1a, b of the Research Vessel Polarstern in 2002. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 446, 117 pp,
Median Latitude: 74.416241 * Median Longitude: -2.980920 * South-bound Latitude: 61.529500 * West-bound Longitude: -38.130900 * North-bound Latitude: 75.118600 * East-bound Longitude: 17.104300
Date/Time Start: 2002-07-02T05:43:00 * Date/Time End: 2002-07-29T01:52:00
Minimum DEPTH, water: 1.98 m * Maximum DEPTH, water: 3705.09 m
PS62/004-1 * Latitude: 61.529500 * Longitude: -38.130900 * Date/Time: 2002-07-02T05:43:00 * Elevation: -2561.0 m * Location: Greenland Sea * Campaign: ARK-XVIII/1 (PS62) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
PS62/012-1 * Latitude: 64.623100 * Longitude: -31.694000 * Date/Time: 2002-07-04T08:14:00 * Elevation: -2430.0 m * Location: Greenland Sea * Campaign: ARK-XVIII/1 (PS62) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
PS62/012-4 * Latitude: 64.631400 * Longitude: -31.668700 * Date/Time: 2002-07-04T13:44:00 * Elevation: -2428.0 m * Location: Greenland Sea * Campaign: ARK-XVIII/1 (PS62) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
Sensors, processing and post-cruise corrections: 0 temperature, primary, 1338; 1 conductivity, primary, 1199; 2 pressure, 53962
Sea-Bird-Electronics software: alignctd_adv = c0S/m 0.050; celltm_alpha = 0.0300; celltm_tau = 7.0000; filter_low_pass_tc_B = 0.150; filter_low_pass_B_vars = prDM; loopedit_minVelocity = 0.000; binavg_binsize = 1
Proprietary software following 'Unesco technical papers in marine science, 44' is used subsequently.
correction temperature: t_new: t_old - 1.5 mK/4000dbar*p this is a well documented cross sensitivity of the sensor; correction salinity: s_new = s_old * (34.906/34.904)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Date/Time of eventDate/Time
3Latitude of eventLatitude
4Longitude of eventLongitude
5Elevation of eventElevationm
6DEPTH, waterDepth watermComputedGeocode
7Pressure, waterPressdbarBudéus, GereonCTD, SEA-BIRD SBE 911plus
8Temperature, waterTemp°CBudéus, GereonCTD, SEA-BIRD SBE 911plusIPTS-68
9Temperature, water, potentialTpot°CBudéus, GereonCalculated
10SalinitySalBudéus, GereonCalculated from conductivityPSU
11Density, sigma-theta (0)Sigma-thetakg/m3Budéus, GereonCalculated
1158740 data points

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