A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation
The circulation on Western Bank is described using data collected in spring 1991 and 1992 as part of an interdisciplinary study of the early life history of Atlantic cod (Gadus morhua). The mean circulation over the crest of the bank is weak, of the order of a few centimeters per second, and is flan...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophys. Union
2013
|
Subjects: | |
Online Access: | https://doi.org/10.1029/98JC01765 http://hdl.handle.net/10222/27535 |
id |
ftdalhouse:oai:DalSpace.library.dal.ca:10222/27535 |
---|---|
record_format |
openpolar |
spelling |
ftdalhouse:oai:DalSpace.library.dal.ca:10222/27535 2023-05-15T15:27:44+02:00 A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation Thompson, K. R. Griffin, D. A. 2013-06-19T18:06:27Z https://doi.org/10.1029/98JC01765 http://hdl.handle.net/10222/27535 unknown American Geophys. Union Journal of Geophysical Research Thompson, K. R., and D. A. Griffin. 1998. "A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation." Journal of Geophysical Research 103: 30641-60. DOI:10.1029/98JC01765 0148-0227 http://dx.doi.org/10.1029/98JC01765 http://hdl.handle.net/10222/27535 103 30641 This paper was published by AGU. Copyright 1988 American Geophysical Union Oceanographic regions Tides Wind article 2013 ftdalhouse https://doi.org/10.1029/98JC01765 2021-12-29T18:08:45Z The circulation on Western Bank is described using data collected in spring 1991 and 1992 as part of an interdisciplinary study of the early life history of Atlantic cod (Gadus morhua). The mean circulation over the crest of the bank is weak, of the order of a few centimeters per second, and is flanked to the south and west by an anticyclonic flow with a speed of about 10 cm s-1. A thermal wind calculation shows the mean circulation is due primarily to horizontal variations in the density field. The M2 tidal constituent is dominant and reaches speeds of about 20 cm s-1. The tidal residuals have a standard deviation of about 10 cm s-1 and characteristic time and length scales of several days and tens of kilometers, respectively. In order to help collect and interpret biological data from Western Bank, we developed a hydrodynamic model of the near-surface flow that could be used operationally. The model is based on a decomposition of the flow into components driven by (1) local wind stress, (2) horizontal density gradients, and (3) flows through the open boundaries of the model. The wind-driven component is calculated using a simple slab model driven by the observed wind. The other two components are estimated through the assimilation of observed bottom pressures, dynamic heights, and currents into the hydrodynamic model. The hindcast skill of the model is quantified by cross validation and shown to be higher than that of four simple, statistically based schemes Article in Journal/Newspaper atlantic cod Gadus morhua Dalhousie University: DalSpace Institutional Repository Journal of Geophysical Research: Oceans 103 C13 30641 30660 |
institution |
Open Polar |
collection |
Dalhousie University: DalSpace Institutional Repository |
op_collection_id |
ftdalhouse |
language |
unknown |
topic |
Oceanographic regions Tides Wind |
spellingShingle |
Oceanographic regions Tides Wind Thompson, K. R. Griffin, D. A. A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation |
topic_facet |
Oceanographic regions Tides Wind |
description |
The circulation on Western Bank is described using data collected in spring 1991 and 1992 as part of an interdisciplinary study of the early life history of Atlantic cod (Gadus morhua). The mean circulation over the crest of the bank is weak, of the order of a few centimeters per second, and is flanked to the south and west by an anticyclonic flow with a speed of about 10 cm s-1. A thermal wind calculation shows the mean circulation is due primarily to horizontal variations in the density field. The M2 tidal constituent is dominant and reaches speeds of about 20 cm s-1. The tidal residuals have a standard deviation of about 10 cm s-1 and characteristic time and length scales of several days and tens of kilometers, respectively. In order to help collect and interpret biological data from Western Bank, we developed a hydrodynamic model of the near-surface flow that could be used operationally. The model is based on a decomposition of the flow into components driven by (1) local wind stress, (2) horizontal density gradients, and (3) flows through the open boundaries of the model. The wind-driven component is calculated using a simple slab model driven by the observed wind. The other two components are estimated through the assimilation of observed bottom pressures, dynamic heights, and currents into the hydrodynamic model. The hindcast skill of the model is quantified by cross validation and shown to be higher than that of four simple, statistically based schemes |
format |
Article in Journal/Newspaper |
author |
Thompson, K. R. Griffin, D. A. |
author_facet |
Thompson, K. R. Griffin, D. A. |
author_sort |
Thompson, K. R. |
title |
A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation |
title_short |
A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation |
title_full |
A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation |
title_fullStr |
A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation |
title_full_unstemmed |
A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation |
title_sort |
model of the circulation on the outer scotian shelf with open boundary conditions inferred by data assimilation |
publisher |
American Geophys. Union |
publishDate |
2013 |
url |
https://doi.org/10.1029/98JC01765 http://hdl.handle.net/10222/27535 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
Journal of Geophysical Research Thompson, K. R., and D. A. Griffin. 1998. "A model of the circulation on the outer Scotian shelf with open boundary conditions inferred by data assimilation." Journal of Geophysical Research 103: 30641-60. DOI:10.1029/98JC01765 0148-0227 http://dx.doi.org/10.1029/98JC01765 http://hdl.handle.net/10222/27535 103 30641 |
op_rights |
This paper was published by AGU. Copyright 1988 American Geophysical Union |
op_doi |
https://doi.org/10.1029/98JC01765 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
103 |
container_issue |
C13 |
container_start_page |
30641 |
op_container_end_page |
30660 |
_version_ |
1766358140451815424 |