Citation:

2004JC002318

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Abstract:

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, https://doi.org/10.2312/BzPM_0446_2003

Project(s):

Physical Oceanography @ AWI (AWI_PhyOce)

Coverage:

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

Event(s):

PS62/004-1 * Latitude: 61.529500 * Longitude: -38.130900 * Date/Time: 2002-07-02T05:43:00 * Elevation: -2561.0 m * Location: Greenland Sea * Campaign: (PS62) * Basis: * Method/Device: (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: (PS62) * Basis: * Method/Device: (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: (PS62) * Basis: * Method/Device: (CTD-RO)

Comment:

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)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Date/Time of event	Date/Time
3	Latitude of event	Latitude
4	Longitude of event	Longitude
5	Elevation of event	Elevation	m
6	DEPTH, water	Depth water	m		Computed	Geocode
7	Pressure, water	Press	dbar	Budéus, Gereon	CTD, Sea-Bird SBE 911plus
8	Temperature, water	Temp	°C	Budéus, Gereon	CTD, Sea-Bird SBE 911plus	IPTS-68
9	Temperature, water, potential	Tpot	°C	Budéus, Gereon	Calculated
10	Salinity	Sal		Budéus, Gereon	Calculated from conductivity	PSU
11	Density, sigma-theta (0)	Sigma-theta	kg/m³	Budéus, Gereon	Calculated

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

1158740 data points

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