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    The Annual Evolution of Geostrophic Flow in the Gulf of Maine: 1986–1987

    Source: Journal of Physical Oceanography:;1992:;Volume( 022 ):;issue: 005::page 445
    Author:
    Brown, Wendell S.
    ,
    Irish, James D.
    DOI: 10.1175/1520-0485(1992)022<0445:TAEOGF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The annual evolution of the geostrophic flow structure in the Gulf of Maine was studied with a combined set of moored pressure time-series measurements and five hydrographic surveys from August 1986 through September 1987. A series of quasi-synoptic dynamic height maps depicts a gulf flow structure whose typical spatial scales decrease from order 100 km during the winter to about half that in the summer, when the evolution of surface, intermediate, and deep water masses is most rapid and complex. The unusually large amount of freshwater in the gulf during 1987 was partially responsible for the establishment of a north?south across-gulf front during the summer. Year-long time series of bottom pressure and internal pressure (derived from temperature and conductivity measurements in Georges and Jordan basins) have been differenced with coastal synthetic subsurface pressures (SSP) to yield a history of the basin-scale geostrophic flow variability. The basin-scale geostrophic transport was dominated by cyclonic flow (>0.5 ? 106 m3 s?1) through the gulf during autumn 1986. During early January 1987, the flow around Jordan Basin became anticyclonic as relatively fresh Scotian shelf water flowed into the eastern gulf. Though temporarily disrupted during April and May, the Jordan Basin anticyclone persisted through July. Inflows of slope water to Georges Basin helped to establish a robust (0.5 ? 106 m3 s?1) cyclonic flow around Georges Basin in June and July. Though somewhat weakened (?0.3 ? 106 m3 s?1), the cyclonic gyre migrated with the flow of slope and Maine bottom water to Jordan Basin in August. The delay in the establishment of the cyclonic gyre in Jordan Basin in 1987 appears to have been related in part to the effects of the anomalously large amount of freshwater in the gulf during 1987. A conceptual model of the annual evolution of gulf-scale flow, based on a hypothesized interplay of pressure gradient forcing produced by variable inflows (outflows), thermohaline forcing, and, to a lesser extent, wind forcing, is presented.
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      The Annual Evolution of Geostrophic Flow in the Gulf of Maine: 1986–1987

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4164936
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    contributor authorBrown, Wendell S.
    contributor authorIrish, James D.
    date accessioned2017-06-09T14:50:17Z
    date available2017-06-09T14:50:17Z
    date copyright1992/05/01
    date issued1992
    identifier issn0022-3670
    identifier otherams-27882.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4164936
    description abstractThe annual evolution of the geostrophic flow structure in the Gulf of Maine was studied with a combined set of moored pressure time-series measurements and five hydrographic surveys from August 1986 through September 1987. A series of quasi-synoptic dynamic height maps depicts a gulf flow structure whose typical spatial scales decrease from order 100 km during the winter to about half that in the summer, when the evolution of surface, intermediate, and deep water masses is most rapid and complex. The unusually large amount of freshwater in the gulf during 1987 was partially responsible for the establishment of a north?south across-gulf front during the summer. Year-long time series of bottom pressure and internal pressure (derived from temperature and conductivity measurements in Georges and Jordan basins) have been differenced with coastal synthetic subsurface pressures (SSP) to yield a history of the basin-scale geostrophic flow variability. The basin-scale geostrophic transport was dominated by cyclonic flow (>0.5 ? 106 m3 s?1) through the gulf during autumn 1986. During early January 1987, the flow around Jordan Basin became anticyclonic as relatively fresh Scotian shelf water flowed into the eastern gulf. Though temporarily disrupted during April and May, the Jordan Basin anticyclone persisted through July. Inflows of slope water to Georges Basin helped to establish a robust (0.5 ? 106 m3 s?1) cyclonic flow around Georges Basin in June and July. Though somewhat weakened (?0.3 ? 106 m3 s?1), the cyclonic gyre migrated with the flow of slope and Maine bottom water to Jordan Basin in August. The delay in the establishment of the cyclonic gyre in Jordan Basin in 1987 appears to have been related in part to the effects of the anomalously large amount of freshwater in the gulf during 1987. A conceptual model of the annual evolution of gulf-scale flow, based on a hypothesized interplay of pressure gradient forcing produced by variable inflows (outflows), thermohaline forcing, and, to a lesser extent, wind forcing, is presented.
    publisherAmerican Meteorological Society
    titleThe Annual Evolution of Geostrophic Flow in the Gulf of Maine: 1986–1987
    typeJournal Paper
    journal volume22
    journal issue5
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1992)022<0445:TAEOGF>2.0.CO;2
    journal fristpage445
    journal lastpage473
    treeJournal of Physical Oceanography:;1992:;Volume( 022 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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