Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model
The mechanisms and geographic distribution of global tidal dissipation in barotropic tidal models are examined using a high resolution unstructured mesh finite element model. Mesh resolution varies between 2 and 25 km and is especially focused on inner shelves and steep bathymetric gradients. Tidal...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , , , , , , , , , |
Language: | unknown |
Published: |
2022
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1869923 https://www.osti.gov/biblio/1869923 https://doi.org/10.1029/2021jc018178 |
id |
ftosti:oai:osti.gov:1869923 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:1869923 2023-07-30T04:04:01+02:00 Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model Blakely, Coleman P. Ling, Guoming Pringle, William J. Contreras, María Teresa Wirasaet, Damrongsak Westerink, Joannes J. Moghimi, Saeed Seroka, Greg Shi, Lei Myers, Edward Owensby, Margaret Massey, Chris 2022-08-08 application/pdf http://www.osti.gov/servlets/purl/1869923 https://www.osti.gov/biblio/1869923 https://doi.org/10.1029/2021jc018178 unknown http://www.osti.gov/servlets/purl/1869923 https://www.osti.gov/biblio/1869923 https://doi.org/10.1029/2021jc018178 doi:10.1029/2021jc018178 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1029/2021jc018178 2023-07-11T10:12:38Z The mechanisms and geographic distribution of global tidal dissipation in barotropic tidal models are examined using a high resolution unstructured mesh finite element model. Mesh resolution varies between 2 and 25 km and is especially focused on inner shelves and steep bathymetric gradients. Tidal response sensitivities to bathymetric changes are examined to put into context response sensitivities to frictional processes. We confirm that the Ronne Ice Shelf dramatically affects Atlantic tides but also find that bathymetry in the Hudson Bay system is a critical control. We follow a sequential frictional parameter optimization process and use TPXO9 data-assimilated tidal elevations as a reference solution. From simulated velocities and depths, dissipation within the global model is estimated and allows us to pinpoint dissipation at high resolution. Boundary layer dissipation is extremely focused with 1.4% of the ocean accounting for 90% of the total. Internal tide friction is much more distributed with 16.7% of the ocean accounting for 90% of the total. Often highly regional dissipation can impact basin-scale and even ocean wide tides. Optimized boundary layer friction parameters correlate very well with the physical characteristics of the locality with high friction factors associated with energetic tidal regions, deep ocean island chains, and ice covered areas. Global complex M 2 tide errors are 1.94 cm in deep waters. Total global boundary layer and internal tide dissipation are estimated, respectively, at 1.83 and 1.49 TW. This continues the trend in the literature toward attributing more dissipation to internal tides. Other/Unknown Material Hudson Bay Ice Shelf Ronne Ice Shelf ice covered areas Ocean Island SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Hudson Hudson Bay Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Journal of Geophysical Research: Oceans 127 5 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Blakely, Coleman P. Ling, Guoming Pringle, William J. Contreras, María Teresa Wirasaet, Damrongsak Westerink, Joannes J. Moghimi, Saeed Seroka, Greg Shi, Lei Myers, Edward Owensby, Margaret Massey, Chris Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
The mechanisms and geographic distribution of global tidal dissipation in barotropic tidal models are examined using a high resolution unstructured mesh finite element model. Mesh resolution varies between 2 and 25 km and is especially focused on inner shelves and steep bathymetric gradients. Tidal response sensitivities to bathymetric changes are examined to put into context response sensitivities to frictional processes. We confirm that the Ronne Ice Shelf dramatically affects Atlantic tides but also find that bathymetry in the Hudson Bay system is a critical control. We follow a sequential frictional parameter optimization process and use TPXO9 data-assimilated tidal elevations as a reference solution. From simulated velocities and depths, dissipation within the global model is estimated and allows us to pinpoint dissipation at high resolution. Boundary layer dissipation is extremely focused with 1.4% of the ocean accounting for 90% of the total. Internal tide friction is much more distributed with 16.7% of the ocean accounting for 90% of the total. Often highly regional dissipation can impact basin-scale and even ocean wide tides. Optimized boundary layer friction parameters correlate very well with the physical characteristics of the locality with high friction factors associated with energetic tidal regions, deep ocean island chains, and ice covered areas. Global complex M 2 tide errors are 1.94 cm in deep waters. Total global boundary layer and internal tide dissipation are estimated, respectively, at 1.83 and 1.49 TW. This continues the trend in the literature toward attributing more dissipation to internal tides. |
author |
Blakely, Coleman P. Ling, Guoming Pringle, William J. Contreras, María Teresa Wirasaet, Damrongsak Westerink, Joannes J. Moghimi, Saeed Seroka, Greg Shi, Lei Myers, Edward Owensby, Margaret Massey, Chris |
author_facet |
Blakely, Coleman P. Ling, Guoming Pringle, William J. Contreras, María Teresa Wirasaet, Damrongsak Westerink, Joannes J. Moghimi, Saeed Seroka, Greg Shi, Lei Myers, Edward Owensby, Margaret Massey, Chris |
author_sort |
Blakely, Coleman P. |
title |
Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model |
title_short |
Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model |
title_full |
Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model |
title_fullStr |
Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model |
title_full_unstemmed |
Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model |
title_sort |
dissipation and bathymetric sensitivities in an unstructured mesh global tidal model |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1869923 https://www.osti.gov/biblio/1869923 https://doi.org/10.1029/2021jc018178 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Hudson Hudson Bay Ronne Ice Shelf |
geographic_facet |
Hudson Hudson Bay Ronne Ice Shelf |
genre |
Hudson Bay Ice Shelf Ronne Ice Shelf ice covered areas Ocean Island |
genre_facet |
Hudson Bay Ice Shelf Ronne Ice Shelf ice covered areas Ocean Island |
op_relation |
http://www.osti.gov/servlets/purl/1869923 https://www.osti.gov/biblio/1869923 https://doi.org/10.1029/2021jc018178 doi:10.1029/2021jc018178 |
op_doi |
https://doi.org/10.1029/2021jc018178 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
5 |
_version_ |
1772815190910304256 |