ࡱ> #` !bjbjmm 02xxxxxxx$! A!C!C!C!C!C!C!$#h6&hg!xg!xx|![[[xxA![A![[rTxx  q`:% 5! !0!3 & (& &x d[g!g!3(!$ xxxxxx  JCOMM/SPA Expert Team on Operational Ocean Forecasting Systems National report 2010 Centre name: UK Met Office Address: Met Office, FitzRoy Road, Exeter EX1 3PB, United Kingdom Author: Alistair Sellar, Matt Martin Guidelines for the preparing the national report (a) It is not mandatory to complete all sections (b) Report on significant changes/improvements (c) Content should be of potential value to the international group (d) Prepare a written report for circulation prior to the meeting (e) Prepare a ppt on specific highlights to present at the meeting A General report content Operational system updates/upgrades: A number of developments to the FOAM system have been tested over the past year. The latest version of NEMO (3.2) has been tested in FOAM, including changes to the TKE scheme, and the operational system will be upgraded to this version before the end of 2010. An increase in the frequency of surface forcing to 3-hourly fluxes (from 6-hourly) has been shown to improve the models representation of the diurnal cycle and will be implemented operationally. Investigations into the use of a different sea-ice model, CICE, have been carried out. This sea-ice model is used by the climate modelling group in the Met Office Hadley Centre. However, it was found that this model does not currently improve the representation of sea-ice thickness in FOAM, compared to LIM2, and this change will not be implemented operationally for the time being. A major improvement to the operational data assimilation system over the past year has been to implement operationally a 2-day hindcast each day. This change led to an improvement of approximately 5% in the accuracy of sub-surface temperature and salinity fields compared to observations. We have also implemented a major upgrade to the error covariance specification. Seasonally varying estimates of the error covariances have been made using output from 2-year hindcasts. The spatial characteristics of the background error covariances have been calculated using the NMC method, while the magnitude of the background and observation error variances have been calculated using innovation statistics (based on the Hollingsworth and Lonnberg technique) from the same integration. The new error covariances were shown to particularly improve the surface temperature and height forecasts. Operational system events: In July 2010, there was a failure in a post-processing script which prepares products for the Royal Navy customer. Normally such a failure would be detected immediately and the script re-run promptly. However, the failure detection system did not work well in this instance, and the failure was noticed later during routine monitoring by a member of the R&D group. As a result the products were delivered to this important customer 8 hours behind schedule. Learning lessons from this, the post-processing scripts have been made more robust, and the failure detection system improved. Ocean forecast events and impact: The data provided by the FOAM system has been used for a number of downstream applications over the past year. Support for oil spill modelling has been provided for the Deepwater Horizon oil spill in the Gulf of Mexico, and for the Montara Wellhead oil spill in Australian waters. For the Gulf of Mexico, we have requested feedback on the usefulness of this data feed. Ocean forecast performance monitoring: Operational systems to provide verification of the ocean analyses and forecasts have been running for a number of years. More recently, developments have been made to define file formats and systems to produce class 4 diagnostics, comparing forecasts against observations. It is planned to use these diagnostics as part of a routine GODAE inter-comparison initiative. We are developing our methodology for validating surface currents using drifting buoys. The most significant improvement in accuracy in the last year arose from the change in the data assimilation cycle described above. This resulted in a 5% reduction in RMS errors of temperature and salinity relative to profile data. Ocean observational requirements: Validation of near-surface currents against drifters highlights a problem with buoys losing drogues in the Southern Ocean without reporting drogue loss, leading to biased observational estimates of ACC currents. The latest generation of Metocean drifters will use a more robust method for detecting the loss of the drogue, and are soon to be deployed in the Southern Ocean. Ocean forecast extremes and emergency services: Outline ocean extremes that occur within your region of service Describe the quality of detection and monitoring for extreme conditions Describe the integration of ocean state information with authorities responsible for emergency operations Developing capacity to respond to emergencies, adaptive observing, event based high resolution forecasting Identify gaps and areas for improvement to effect greater impact Management and planning services: A demonstration system has been set-up to provide surface winds and surface currents to BMT and the UK Maritime and Coastguard Agency (MCA), in order to support search and rescue operations. FOAM surface currents are used by commercial operators to provide ship-routing services. Future trends The Met Office is developing a coupled atmosphere-ocean-wave weather forecasting system. When operational, this will provide consistency between the oceanographic and marine meteorological products. B Specific workplan content Observational requirements The UK Met Office is involved in some activities to test the impact of various data sources for data assimilation. The outcomes of these activities will inform requirements for these data types. A GHRSST-DPCP initiative to improve the accuracy of temperature sensors on surface drifters Assessing the impact of the loss of Envisat SST and SLA data on operation systems during October 2010 Assessing the potential for assimilating glider data Assessing the potential for assimilating data from sensors on marine mammals Operational performance monitoring: We plan to develop our systems for validation using class 4 metrics We will increase our focus on surface currents and on diurnal variability We are involved in developing a class 4 intercomparison methodology as part of the GOVST task team for intercomparison and validation Ocean services and user requirements TBD The Guide Leading the preparation of the first draft of the guide (see separate work plan for the guide) Ocean data management TBD BCRWXes}: < S T m n w y 5@o;<=XQ俵䮧ǎǎǎǎǎǎdž˂hfxh}bwh+p5 h=hat hathathf hC(hf hC(hC( hp$hC(hh+p5>*hh+p5hathC(hAh+p5 h+p5h<h+p5h+ph omH sH jh}h oUmH sH 3BCXYtu @ p 9 : S T y ;gdatgdC(gd+p$a$gd+p!;<=X9:a)*6f;|}^gd*}gdp$gdfxgd+pgdat89:T_`a%)6CPu $,Y}C[tξ羺ﮧhhl%h+p5hZc"h*}5 h*}h*}h*}hZc"h+p5h[h oh~h+p5hfhb hp$hat hp$hb hp$h ohathfx h+p5hAh+p5h+p9O; ! !1!5!6!@!!! & Fgdiie & Fgdi4 & Fgdk| & Fgd]r & Fgdi4gd+ptu{|HN : ; ! !1!5!@!!!!!ǿǻǻڷگګhiiehMahhk|hht]hi4h]rhh+p5>* h+p5h+ph*}hfmH sH hfhfmH sH hfh*}mH sH %!!!!! & Fgdi4gd+p.:p+p|. 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