DOI: 10.17882/86286
title: Outputs from a Regional Ocean Modeling System (ROMS) data assimilative reanalysis (version DopAnV2R3-ini2007) of ocean circulation in the Mid-Atlantic Bight and Gulf of Maine for 2007-2020

description: A hindcast reanalysis of ocean circulation in the Mid-Atlantic Bight and Gulf of Maine has been computed using the Regional Ocean Modeling System (ROMS) with 4-Dimensional Variational (4D-Var) assimilation of data from satellites, land-based ocean surface current measuring radar, and all available in situ observations from the MARACOOS (maracoos.org) and NERACOOS (neracoos.org) regional associations of the U.S. Integrated Ocean Observing System (IOOS). This reanalysis is version DopAnV2R3-ini2007 (Version 2, Release 3, initialized January 2007).
The analysis covers the period 2-Jan-2007 to 30-Aug-2021 on a 7-km horizonal grid with 40 vertical terrain-following s-coordinate levels. Ocean state variables computed are sea level, velocity, temperature, and salinity. Air-sea fluxes of heat and momentum, and surface and bottoms stresses, are included.
Results are provided on the ROMS model native 3-dimensional grid as (i) 1-hourly interval snapshots (ROMS “history” files), (ii) 1-day averages, (iii) monthly averages, (iv) yearly averages, and (v) ensemble monthly averages (i.e., the mean of all days in the same month from all years). The output files are in netCDF format and data and metadata follow CF-1.4 Conventions for the description of coordinates and variables.
The files uploaded here are examples of one time record from each of these 5 collections. Outputs for the full reanalysis, which comprises 6.8 Terabytes fo data, are made available for download via a THREDDS (Thematic Real-time Environmental Distributed Data Services) web service to facilitate user geospatial or temporal sub-setting.
The THREDDS catalog URLs and example filenames available here, for the respective collections, are:
 - 1-hourly history snapshots 2007-01-02 01:00 through 2021-08-31 00:00: ttps://tds.marine.rutgers.edu/thredds/roms/doppio/catalog.html?dataset=DopAnV2R3-ini2007_da_history Example file uploaded here is his_DopAnV2R3_20140516T0100.nc for 2014-05-06 01:00
 - 24-hour averages 2007-01-02 12:00 through 2021-08-30 12:00 https://tds.marine.rutgers.edu/thredds/roms/doppio/catalog.html?dataset=DopAnV2R3-ini2007_da_average Example file uploaded here is avg_DopAnV2R3_20140516T1200.nc for 2014-05-06
 - Monthly averages 2007-01-17 through 2020-12-16  https://tds.marine.rutgers.edu/thredds/roms/doppio/catalog.html?dataset=DopAnV2R3-ini2007_da_monthly_averages Example file uploaded here is mon_DopAnV2R3_201405.nc for 2014-05
 - Yearly averages 2007 through 2020: https://tds.marine.rutgers.edu/thredds/roms/doppio/catalog.html?dataset=DopAnV2R3-ini2007_da_yearly_averages Example file uploaded here is year_DopAnV2R3_2014.nc for 2014
 - Monthly ensemble averages: https://tds.marine.rutgers.edu/thredds/roms/doppio/catalog.html?dataset=DopAnV2R3-ini2007_da_monthly_ensemble_means Example file uploaded here is ensmon_DopAnV2R3_05.nc for May
The underlying ocean circulation model configuration is described by Lopez et al (2020). The observations that are assimilated and the error hypotheses and other aspects of the 4D-Var assimilation implementation are described by Levin et al. (2020; 2021).
López, A. G., J. L. Wilkin and J. C. Levin, (2020) Doppio – a ROMS (v3.6)-based circulation model for the Mid-Atlantic Bight and Gulf of Maine: configuration and comparison to integrated coastal observing network observations, Geosci. Model Dev., 13, 3709–3729, doi: 10.5194/gmd-13-3709-2020
Levin, J., H. Arango, B. Laughlin, E. Hunter, J. Wilkin and A. Moore, (2020), Observation impacts on the Mid-Atlantic Bight front and cross-shelf transport in 4D-Var ocean state estimates, Part I – Multiplatform Analysis, Ocean Modelling, 156, 101721, doi: 10.1016/j.ocemod.2020.101721
Levin, J., H. G. Arango, B. Laughlin, J. Wilkin and A. M. Moore, (2021), The Impact of Remote Sensing Observations on Cross-Shelf Transport Estimates from 4D-Var Analyses of the Mid-Atlantic Bight, Advances in Space Research, 68, 553-570, doi: 10.1016/j.asr.2019.09.012