The Regional Ocean Modeling System (ROMS) 4-dimensional variational data assimilation systems

Moore, Andrew M.; Arango, Hernan G.; Broquet, Grégoire; Powell, Brian; Weaver, Anthony; Zavala‐Garay, Javier

doi:10.1016/j.pocean.2011.05.004

Cited by 239 publications

(134 citation statements)

References 58 publications

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“…This OOFS is based on the 7-km horizontal resolution Regional Ocean Modeling System (ROMS) using boundary conditions from the HYCOM-NCODA global OOFS. The system is initialized using daily analyses from a Four-Dimensional Variational (4DVAR) analysis system with a 3-day analysis window (Moore et al 2011), which assimilates a large set of data [including glider T/S profiles and CODAR HF-Radar measurements (http://www.myroms.org/espresso/)].…”

Section: Specific Approaches For Regional Operational Systemsmentioning

confidence: 99%

Recent progress in performance evaluations and near real-time assessment of operational ocean products

Hernández

Blockley

Brassington

et al. 2015

Journal of Operational Oceanography

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Section: Specific Approaches For Regional Operational Systemsmentioning

confidence: 99%

Recent progress in performance evaluations and near real-time assessment of operational ocean products

Hernández

Blockley

Brassington

et al. 2015

Journal of Operational Oceanography

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“…The Regional Ocean Modeling System (ROMS) is a stateof-the-art, free-surface, hydrostatic primitive equation ocean circulation model being used for applications from coastal to basin to global scales by a large global community (Moore et al, 2010;Haidvogel et al, 2008;Shchepetkin and McWilliams, 2005). Shchepetkin and McWilliams (2005) describe the ROMS computational algorithms in detail.…”

Section: Model Setupmentioning

confidence: 99%

“…The ROMS 4DVAR procedure adjusts the initial condition and surface forcing, within the given error bars, to bring the model fit into a closer correspondence to the observed data, in a least-square sense, over a defined assimilation time window. This strategy uses the tangent linear and adjoint models (Moore et al, 2010) in an iterative inner loop to deal with the non-linearities of the system. IS4DVAR has been tested by Di Lorenzo et al (2007) in an idealized 3-D double gyre circulation and in a realistic application for the geometry and bathymetry of the Southern California Bight (SCB), a region characterized by strong mesoscale eddy variability like the SEP. After a first-guess non-linear run of ROMS, several purely linear inner loops are executed to reduce the misfit, as measured by the cost function.…”

Section: Assimilation Techniquementioning

confidence: 99%

A data assimilative perspective of oceanic mesoscale eddy evolution during VOCALS-REx

et al. 2013

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Abstract. Oceanic observations collected during the VOCALS-REx cruise time period, 1–30 November 2008, are assimilated into a regional ocean model (ROMS) using 4DVAR and then analyzed for their dynamics. Nonlinearities in the system prevent a complete 30-day fit, so two 15-day fits for 1–15 November and 16–30 November are executed using the available observations of hydrographic temperature and salinity, along with satellite fields of SST and sea-level height anomaly. The fits converge and reduce the cost function significantly, and the results indicated that ROMS is able to successfully reproduce both large-scale and smaller-scale features of the flows observed during the VOCALS-REx cruise. Particular attention is focused on an intensively studied eddy at 76° W, 19° S. The ROMS fits capture this eddy as an isolated rotating 3-D vortex with a strong subsurface signature in velocity, temperature and anomalously low salinity. The eddy has an average temperature anomaly of approximately −0.5 °C over a depth range from 50–600 m and features a cold anomaly of approximately −1 °C near 150 m depth. The eddy moves northwestward and elongates during the second 15-day fit. It exhibits a strong signature in the Okubo-Weiss parameter, which indicates significant nonlinearity in its evolution. The heat balance for the period of the cruise from the ocean state estimate reveals that the horizontal advection and the vertical mixing processes are the dominant terms that balance the temperature tendency of the upper layer of the ocean locally in time and space. Areal averages around the eddies, for a 15-day period during the cruise, suggest that vertical mixing processes generally balance the surface heating. Although, this indicates only a small role for lateral advective processes in this region during this period, this quasi-instantaneous heat budget analysis cannot be extended to interpret the seasonal or long-term upper ocean heat budget in this region.

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“…Progress in this area is attributable primarily to the Global Ocean Data Assimilation Experiment project, which, crucially, supports near-real-time collection, processing, and management of oceanographic data [6] [7]. In addition, several state-of-the-art community ocean models, which can be coupled with data assimilation schemes, have been developed as open-source code (e.g., ROMS [8] and ECCO [9]) and have contributed to making ocean nowcasting and forecasting relatively easy. Consequently, physical oceanographic studies have made rapid progress in the areas of ocean dynamics and predictability.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Japanese Fisheries Science in the Kuroshio-Oyashio Region through Development of the FRA-ROMS Ocean Forecast System: Overview of the Reproducibility of Reanalysis Products

Kuroda¹,

Setou²,

Kakehi³

et al. 2017

OJMS

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To address various fisheries science problems around Japan, the Japan Fisheries Research and Education Agency (FRA) has developed an ocean forecast system by combining an ocean circulation model based on the Regional Ocean Modeling System (ROMS) with three-dimensional variational analysis schemes. This system, which is called FRA-ROMS, is a basic and essential tool for the systematic conduct of fisheries science. The main aim of FRA-ROMS is to realistically simulate mesoscale variations over the Kuroshio-Oyashio region. Here, in situ oceanographic and satellite data were assimilated into FRA-ROMS using a weekly time window. We first examined the reproducibility through comparison with several oceanographic datasets with an Eulerian reference frame. FRA-ROMS was able to reproduce representative features of mesoscale variations such as the position of the Kuroshio path, variability of the Kuroshio Extension, and southward intrusions of the Oyashio. Second, using a Lagrangian reference frame, we estimated position errors between ocean drifters and How to cite this paper: Kuroda, H., Setou, T., Kakehi, S., Ito, S., Taneda, T., Azumaya, T., Inagake, D., Hiroe, Y., Morinaga, K., Okazaki, M., Yokota, T., Okunishi, T. 63particles passively transported by simulated currents, because particle tracking is an essential technique used in applications of reanalysis products to fisheries science. Finally, we summarize recent and ongoing fisheries studies that use FRA-ROMS and mention several new developments and enhancements that will be implemented in the near future.

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The Regional Ocean Modeling System (ROMS) 4-dimensional variational data assimilation systems

Cited by 239 publications

References 58 publications

Recent progress in performance evaluations and near real-time assessment of operational ocean products

Recent progress in performance evaluations and near real-time assessment of operational ocean products

A data assimilative perspective of oceanic mesoscale eddy evolution during VOCALS-REx

Recent Advances in Japanese Fisheries Science in the Kuroshio-Oyashio Region through Development of the FRA-ROMS Ocean Forecast System: Overview of the Reproducibility of Reanalysis Products

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