The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts
The Met Office Forecast Ocean Assimilation Model (FOAM) ocean–sea-ice analysis and forecasting operational system has been using an ORCA tripolar grid with 1/4° horizontal grid spacing since December 2008. Surface boundary forcing is provided by numerical weather prediction fields from the operation...
Published in: | Quarterly Journal of the Royal Meteorological Society |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/537760/ https://nora.nerc.ac.uk/id/eprint/537760/1/Quart%20J%20Royal%20Meteoro%20Soc%20-%202024%20-%20Barbosa%20Aguiar%20-%20The%20Met%20Office%20Forecast%20Ocean%20Assimilation%20Model%20%20FOAM%20%20using%20a%201.pdf https://doi.org/10.1002/qj.4798 |
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ftnerc:oai:nora.nerc.ac.uk:537760 2024-09-15T18:28:58+00:00 The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts Barbosa Aguiar, Ana Bell, Michael J. Blockley, Edward Calvert, Daley Crocker, Richard Inverarity, Gordon King, Robert Lea, Daniel J. Maksymczuk, Jan Martin, Matthew J. Price, Martin R. Siddorn, John Smout‐Day, Kerry Waters, Jennifer While, James 2024-07-14 text http://nora.nerc.ac.uk/id/eprint/537760/ https://nora.nerc.ac.uk/id/eprint/537760/1/Quart%20J%20Royal%20Meteoro%20Soc%20-%202024%20-%20Barbosa%20Aguiar%20-%20The%20Met%20Office%20Forecast%20Ocean%20Assimilation%20Model%20%20FOAM%20%20using%20a%201.pdf https://doi.org/10.1002/qj.4798 en eng https://nora.nerc.ac.uk/id/eprint/537760/1/Quart%20J%20Royal%20Meteoro%20Soc%20-%202024%20-%20Barbosa%20Aguiar%20-%20The%20Met%20Office%20Forecast%20Ocean%20Assimilation%20Model%20%20FOAM%20%20using%20a%201.pdf Barbosa Aguiar, Ana; Bell, Michael J.; Blockley, Edward; Calvert, Daley; Crocker, Richard; Inverarity, Gordon; King, Robert; Lea, Daniel J.; Maksymczuk, Jan; Martin, Matthew J.; Price, Martin R.; Siddorn, John orcid:0000-0003-3848-8868 Smout‐Day, Kerry; Waters, Jennifer; While, James. 2024 The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts. Quarterly Journal of the Royal Meteorological Society. https://doi.org/10.1002/qj.4798 <https://doi.org/10.1002/qj.4798> Publication - Article PeerReviewed 2024 ftnerc https://doi.org/10.1002/qj.4798 2024-07-30T23:43:47Z The Met Office Forecast Ocean Assimilation Model (FOAM) ocean–sea-ice analysis and forecasting operational system has been using an ORCA tripolar grid with 1/4° horizontal grid spacing since December 2008. Surface boundary forcing is provided by numerical weather prediction fields from the operational global atmosphere Met Office Unified Model. We present results from a 2-year simulation using a 1/12° global ocean–sea-ice model configuration while keeping a 1/4° data assimilation (DA) set-up. We also describe recent operational data assimilation enhancements that are included in our 1/4° control and 1/12° simulations: a new bias-correction term for sea-level anomaly assimilation and a revised pressure correction algorithm. The primary effect of the first is to decrease the mean and variability of sea-level anomaly increments at high latitudes, whereas the second significantly reduces the vertical velocity standard deviation in the tropical Pacific. The level of improvement achieved with the higher resolution configuration is moderate but consistently satisfactory when measured using neighbourhood verification metrics that provide fairer quantitative comparisons between gridded model fields at different spatial resolutions than traditional root-mean-square metrics. A comparison of the eddy kinetic energy from each configuration and an observation-based product highlights the regions where further system developments are most needed. Article in Journal/Newspaper Orca Sea ice Natural Environment Research Council: NERC Open Research Archive Quarterly Journal of the Royal Meteorological Society |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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English |
description |
The Met Office Forecast Ocean Assimilation Model (FOAM) ocean–sea-ice analysis and forecasting operational system has been using an ORCA tripolar grid with 1/4° horizontal grid spacing since December 2008. Surface boundary forcing is provided by numerical weather prediction fields from the operational global atmosphere Met Office Unified Model. We present results from a 2-year simulation using a 1/12° global ocean–sea-ice model configuration while keeping a 1/4° data assimilation (DA) set-up. We also describe recent operational data assimilation enhancements that are included in our 1/4° control and 1/12° simulations: a new bias-correction term for sea-level anomaly assimilation and a revised pressure correction algorithm. The primary effect of the first is to decrease the mean and variability of sea-level anomaly increments at high latitudes, whereas the second significantly reduces the vertical velocity standard deviation in the tropical Pacific. The level of improvement achieved with the higher resolution configuration is moderate but consistently satisfactory when measured using neighbourhood verification metrics that provide fairer quantitative comparisons between gridded model fields at different spatial resolutions than traditional root-mean-square metrics. A comparison of the eddy kinetic energy from each configuration and an observation-based product highlights the regions where further system developments are most needed. |
format |
Article in Journal/Newspaper |
author |
Barbosa Aguiar, Ana Bell, Michael J. Blockley, Edward Calvert, Daley Crocker, Richard Inverarity, Gordon King, Robert Lea, Daniel J. Maksymczuk, Jan Martin, Matthew J. Price, Martin R. Siddorn, John Smout‐Day, Kerry Waters, Jennifer While, James |
spellingShingle |
Barbosa Aguiar, Ana Bell, Michael J. Blockley, Edward Calvert, Daley Crocker, Richard Inverarity, Gordon King, Robert Lea, Daniel J. Maksymczuk, Jan Martin, Matthew J. Price, Martin R. Siddorn, John Smout‐Day, Kerry Waters, Jennifer While, James The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts |
author_facet |
Barbosa Aguiar, Ana Bell, Michael J. Blockley, Edward Calvert, Daley Crocker, Richard Inverarity, Gordon King, Robert Lea, Daniel J. Maksymczuk, Jan Martin, Matthew J. Price, Martin R. Siddorn, John Smout‐Day, Kerry Waters, Jennifer While, James |
author_sort |
Barbosa Aguiar, Ana |
title |
The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts |
title_short |
The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts |
title_full |
The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts |
title_fullStr |
The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts |
title_full_unstemmed |
The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts |
title_sort |
met office forecast ocean assimilation model (foam) using a 1/12‐degree grid for global forecasts |
publishDate |
2024 |
url |
http://nora.nerc.ac.uk/id/eprint/537760/ https://nora.nerc.ac.uk/id/eprint/537760/1/Quart%20J%20Royal%20Meteoro%20Soc%20-%202024%20-%20Barbosa%20Aguiar%20-%20The%20Met%20Office%20Forecast%20Ocean%20Assimilation%20Model%20%20FOAM%20%20using%20a%201.pdf https://doi.org/10.1002/qj.4798 |
genre |
Orca Sea ice |
genre_facet |
Orca Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/537760/1/Quart%20J%20Royal%20Meteoro%20Soc%20-%202024%20-%20Barbosa%20Aguiar%20-%20The%20Met%20Office%20Forecast%20Ocean%20Assimilation%20Model%20%20FOAM%20%20using%20a%201.pdf Barbosa Aguiar, Ana; Bell, Michael J.; Blockley, Edward; Calvert, Daley; Crocker, Richard; Inverarity, Gordon; King, Robert; Lea, Daniel J.; Maksymczuk, Jan; Martin, Matthew J.; Price, Martin R.; Siddorn, John orcid:0000-0003-3848-8868 Smout‐Day, Kerry; Waters, Jennifer; While, James. 2024 The Met Office Forecast Ocean Assimilation Model (FOAM) using a 1/12‐degree grid for global forecasts. Quarterly Journal of the Royal Meteorological Society. https://doi.org/10.1002/qj.4798 <https://doi.org/10.1002/qj.4798> |
op_doi |
https://doi.org/10.1002/qj.4798 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
_version_ |
1810470385375772672 |