The Competition of Tidal Mixing and Freshwater Forcing in Shaping the Outflow from Hudson Strait
Freshwater discharge in narrow, surface trapped, boundary plumes is a common feature of many coastal areas and straits, especially in the high latitudes. Such plumes have typically been described with synoptic measurements or steady state theoretical models and little is know about their variability...
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ftdtic:ADA540818 2023-05-15T16:35:16+02:00 The Competition of Tidal Mixing and Freshwater Forcing in Shaping the Outflow from Hudson Strait Straneo, Fiammetta Rainville, Luc WOODS HOLE OCEANOGRAPHIC INSTITUTION MA 2011-04-01 text/html http://www.dtic.mil/docs/citations/ADA540818 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA540818 en eng http://www.dtic.mil/docs/citations/ADA540818 Approved for public release; distribution is unlimited. DTIC Physical and Dynamic Oceanography Hydrology Limnology and Potamology *FRESH WATER *STRAITS *COASTAL REGIONS *TIDES *MIXING BOUNDARY LAYER EDDIES(FLUID MECHANICS) PLUMES RIVERS MOORING ESTUARIES HUDSON BAY WATER OCEAN CURRENTS OPTICAL PROPERTIES LABRADOR SEA MATHEMATICAL MODELS SPATIAL DISTRIBUTION Text 2011 ftdtic 2016-02-23T07:06:10Z Freshwater discharge in narrow, surface trapped, boundary plumes is a common feature of many coastal areas and straits, especially in the high latitudes. Such plumes have typically been described with synoptic measurements or steady state theoretical models and little is know about their variability or the factors which may influence it. Here we take advantage of there years of moored data across the outflow from Hudson Strait, which transport a large volume of riverine fresh water from Hudson Bay to the Labrador Sea, to investigate the tidal to interannual variability in the export and its forcings. Our analysis shows that the outflow is seasonally and interannually modulated by the storage and release of fresh water from the upstream Hudson Bay and that this can be explained in terms of Ekman convergence and divergence acting over the larger Bay. On shorter timescales, we found that a considerable fraction of the freshwater transport is associated with coherent, fresh, anticyclonic eddies embedded in the mean flow. Model results and analysis of the historical data indicates that these eddies are associated with the periodic release of fresh water from Hudson Bay as a result of transiting storms. A comparison of the tidal energy flux from the moorings and from a global tidal model yielded inconclusive results likely due to the limited resolution of the tidal model, and the study of the mixing driven by tides in the region is ongoing. Prepared in cooperation with Applied Physics Laboratory, Seattle, WA. Text Hudson Bay Hudson Strait Labrador Sea Defense Technical Information Center: DTIC Technical Reports database Hudson Hudson Bay Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Physical and Dynamic Oceanography Hydrology Limnology and Potamology *FRESH WATER *STRAITS *COASTAL REGIONS *TIDES *MIXING BOUNDARY LAYER EDDIES(FLUID MECHANICS) PLUMES RIVERS MOORING ESTUARIES HUDSON BAY WATER OCEAN CURRENTS OPTICAL PROPERTIES LABRADOR SEA MATHEMATICAL MODELS SPATIAL DISTRIBUTION |
spellingShingle |
Physical and Dynamic Oceanography Hydrology Limnology and Potamology *FRESH WATER *STRAITS *COASTAL REGIONS *TIDES *MIXING BOUNDARY LAYER EDDIES(FLUID MECHANICS) PLUMES RIVERS MOORING ESTUARIES HUDSON BAY WATER OCEAN CURRENTS OPTICAL PROPERTIES LABRADOR SEA MATHEMATICAL MODELS SPATIAL DISTRIBUTION Straneo, Fiammetta Rainville, Luc The Competition of Tidal Mixing and Freshwater Forcing in Shaping the Outflow from Hudson Strait |
topic_facet |
Physical and Dynamic Oceanography Hydrology Limnology and Potamology *FRESH WATER *STRAITS *COASTAL REGIONS *TIDES *MIXING BOUNDARY LAYER EDDIES(FLUID MECHANICS) PLUMES RIVERS MOORING ESTUARIES HUDSON BAY WATER OCEAN CURRENTS OPTICAL PROPERTIES LABRADOR SEA MATHEMATICAL MODELS SPATIAL DISTRIBUTION |
description |
Freshwater discharge in narrow, surface trapped, boundary plumes is a common feature of many coastal areas and straits, especially in the high latitudes. Such plumes have typically been described with synoptic measurements or steady state theoretical models and little is know about their variability or the factors which may influence it. Here we take advantage of there years of moored data across the outflow from Hudson Strait, which transport a large volume of riverine fresh water from Hudson Bay to the Labrador Sea, to investigate the tidal to interannual variability in the export and its forcings. Our analysis shows that the outflow is seasonally and interannually modulated by the storage and release of fresh water from the upstream Hudson Bay and that this can be explained in terms of Ekman convergence and divergence acting over the larger Bay. On shorter timescales, we found that a considerable fraction of the freshwater transport is associated with coherent, fresh, anticyclonic eddies embedded in the mean flow. Model results and analysis of the historical data indicates that these eddies are associated with the periodic release of fresh water from Hudson Bay as a result of transiting storms. A comparison of the tidal energy flux from the moorings and from a global tidal model yielded inconclusive results likely due to the limited resolution of the tidal model, and the study of the mixing driven by tides in the region is ongoing. Prepared in cooperation with Applied Physics Laboratory, Seattle, WA. |
author2 |
WOODS HOLE OCEANOGRAPHIC INSTITUTION MA |
format |
Text |
author |
Straneo, Fiammetta Rainville, Luc |
author_facet |
Straneo, Fiammetta Rainville, Luc |
author_sort |
Straneo, Fiammetta |
title |
The Competition of Tidal Mixing and Freshwater Forcing in Shaping the Outflow from Hudson Strait |
title_short |
The Competition of Tidal Mixing and Freshwater Forcing in Shaping the Outflow from Hudson Strait |
title_full |
The Competition of Tidal Mixing and Freshwater Forcing in Shaping the Outflow from Hudson Strait |
title_fullStr |
The Competition of Tidal Mixing and Freshwater Forcing in Shaping the Outflow from Hudson Strait |
title_full_unstemmed |
The Competition of Tidal Mixing and Freshwater Forcing in Shaping the Outflow from Hudson Strait |
title_sort |
competition of tidal mixing and freshwater forcing in shaping the outflow from hudson strait |
publishDate |
2011 |
url |
http://www.dtic.mil/docs/citations/ADA540818 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA540818 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Hudson Hudson Bay Hudson Strait |
geographic_facet |
Hudson Hudson Bay Hudson Strait |
genre |
Hudson Bay Hudson Strait Labrador Sea |
genre_facet |
Hudson Bay Hudson Strait Labrador Sea |
op_source |
DTIC |
op_relation |
http://www.dtic.mil/docs/citations/ADA540818 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766025477542117376 |