摘要 :
As a component of the Greenland Sea Project, a hydrographic cruise was conductedon board the USNS BARTLETT during August 1990 in the southern Greenland Sea to continue the study of the southern half of the Greenland Gyre (GG) and ...
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As a component of the Greenland Sea Project, a hydrographic cruise was conductedon board the USNS BARTLETT during August 1990 in the southern Greenland Sea to continue the study of the southern half of the Greenland Gyre (GG) and the Jan Mayen Current (JMC) that was begun with the BARTLETT cruise of September 1989, previously reported by Bourke et al. (1989, 1990, 1992) and by Blythe (1990). A total of 44 high-quality CTD stations were occupied to depths of 1000 m. Contrasting with 1989, 21 instead of five of these stations extended to near bottom at depths of 2200 to 3500 m.
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摘要 :
The report consists of an initial analysis of the ice kinematics field data from MIZEX-83 Greenland Sea Study. The data set consists of distance measurements accurate to 1-2 metres between Del Norte units at five sites, with one s...
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The report consists of an initial analysis of the ice kinematics field data from MIZEX-83 Greenland Sea Study. The data set consists of distance measurements accurate to 1-2 metres between Del Norte units at five sites, with one site being the ship. The data set represents a unique set of measurements of the deformation field of a series of interacting floes.
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Multifractal characteristics of the upper layer thermal structure in the southwestern Greenland Sea, Iceland Sea, and Norwegian Sea (GIN Sea) are analyzed using high-resolution, digital thermistor chain data. The energy spectrum a...
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Multifractal characteristics of the upper layer thermal structure in the southwestern Greenland Sea, Iceland Sea, and Norwegian Sea (GIN Sea) are analyzed using high-resolution, digital thermistor chain data. The energy spectrum at 20 m depth (cold sublayer) shows the existence of a spike at the scale of approximate 3 km representing the chimney scale. The graph dimension varies from higher values such as 1.89 at the surface to 1 .44 - 1.50 in the warm intermediate layer. The stationarity decreases from the ocean surface to the warm intermediate layer. However, the information dimension varies slightly (0.92 to 0.90) that indicates low singularity.
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摘要 :
A sea ice model was applied to the East Greenland Sea to examine a 60-day ice advance period beginning 1 October 1979. This investigation compares model results using driving geostrophic wind fields derived from three sources. Win...
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A sea ice model was applied to the East Greenland Sea to examine a 60-day ice advance period beginning 1 October 1979. This investigation compares model results using driving geostrophic wind fields derived from three sources. Winds calculated from sea-level pressures obtained from the National Weather Service's operational analysis system resulted in strong velocities concentrated in a narrow band adjacent to the Greenland coast, with moderate velocities elsewhere. The model showed excessive ice transport and thickness build-ups in the coastal region. The extreme pressure gradient parallel to the coast resulted partially from a pressure reduction procedure that was applied to the terrain-following sigma coordinate system to obtain sea-level pressures. Additional sea-level pressure fields were obtained from an independent optimal interpolation analysis that merged FGGE buoys drifting in the Arctic basin with high latitude land stations and from manual digitization of the NWS hand-analyzed Northern Hemisphere Surface Charts. Modeling results using winds from both of these fields agreed favorably. (Author)
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摘要 :
A dense network of conductivity-temperature-death (CTD) measurements made over the eastern Greenland continental shelf and slope between 81 N and 75 N provided new detail on the water properties and circulation on the shelf and at...
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A dense network of conductivity-temperature-death (CTD) measurements made over the eastern Greenland continental shelf and slope between 81 N and 75 N provided new detail on the water properties and circulation on the shelf and at the adjacent East Greenland Polar Front (EGPF). The EGPF approaches the shelf break rapidly between 80 N and 78 N remaining 20 to 30 km east of it thereafter at least until 75 N. A filament of Atlantic Water (AW) was found close to the eastern side of the front which became generally cooler with decreasing latitude, suggesting that the majority of the contribution of the West Spitzbergen Current to the southward flowing Return Atlantic Current occurs north of 78 N. The portion of the shelf investigated is cut by several troughs generally oriented east-west; two of which are joined by a north-south depression west of Belgica Bank. Dynamic topography, water properties and ice movement suggest an anti-cyclonic surface circulation over this system of troughs and banks with AIW advecting up the troughs from the east. (Author).
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摘要 :
A sea ice model was applied to the East Greenland Sea to examine a 60-day ice advance period beginning 1 October 1979. This investigation compares model results using driving geostrophic wind fields derived from three sources. Win...
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A sea ice model was applied to the East Greenland Sea to examine a 60-day ice advance period beginning 1 October 1979. This investigation compares model results using driving geostrophic wind fields derived from three sources. Winds calculated from sea-level pressures obtained from the National Weather Service's operational analysis system resulted in strong velocities concentrated in a narrow band adjacent to the Greenland coast, with moderate velocities elsewhere. The model showed excessive ice transport and thickness build-ups in the coastal region. The extreme pressure gradient parallel to the coast resulted partially from a pressure reduction procedure that was applied to the terrain-following sigma coordinate system to obtain sea-level pressures. Additional sea-level pressure fields were obtained from an independent optimal interpolation analysis that merged FGGE buoys drifting in the Arctic basin with high latitude land stations and from manual digitization of the NWS hand-analyzed Northern Hemisphere Surface Charts. Modeling results using winds from both of these fields agreed favorably. (Author)
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摘要 :
This document describes the research strategy for a series of mesoscale studies of Arctic marginal ice zones. The main goal of this program is to gain a better understanding of the processes occurring at the ice margin. These proc...
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This document describes the research strategy for a series of mesoscale studies of Arctic marginal ice zones. The main goal of this program is to gain a better understanding of the processes occurring at the ice margin. These processes are relevant to climate, weather forecasting, petroleum exploration and production, marine transportation, naval operations, and commercial fisheries. In addition, MIZEX will aid in determining what modifications to existing ice-ocean-atmospheric models are needed for better prediction near the ice margin. These goals are consistent with recommendations made by international scientific bodies, most notably those of the Joint Scientific Committee (JSC) in its plan for the World Climate Research Programme (WMO-ICSU, 1981). In this document the JSC states that for improved modeling it is necessary: 'To study the physical processes affecting interactions between air, ice and sea at the sea-ice margin and to develop methods for their adequate representation in climate models.' More specific details on initial field programs will be addressed in planning meetings in the near future. In addition, it is anticipated that other aspects of the program, such as modeling, will be addressed in future workshops, with the results distributed in a similar format to this research strategy.
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