Details:

Journal Title:
Journal of Atmospheric and Oceanic Technology
Personal Author:
Verdy, Ariane ; Cornuelle, Bruce ; Mazloff, Matthew R. ; Rudnick, Daniel L.
Verdy, Ariane ; Cornuelle, Bruce ; Mazloff, Matthew R. ; Rudnick, Daniel L. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
A data-assimilating ⅓° regional dynamical ocean model is evaluated on its ability to synthesize components of the Tropical Pacific Ocean Observing System. The four-dimensional variational data assimilation (4DVAR) method adjusts initial conditions and atmospheric forcing for overlapping 4-month model runs, or hindcasts, that are then combined to give an ocean state estimate for the period 2010–13. Consistency within uncertainty with satellite SSH and Argo profiles is achieved. Comparison to independent observations from Tropical Atmosphere Ocean (TAO) moorings shows that for time scales shorter than 100 days, the state estimate improves estimates of TAO temperature relative to an optimally interpolated Argo product. The improvement is greater at time scales shorter than 20 days, although unpredicted variability in the TAO temperatures implies that TAO observations provide significant information in that band. Larger discrepancies between the state estimate and independent observations from Spray gliders deployed near the Galápagos, Palau, and Solomon Islands are attributed to insufficient model resolution to capture the dynamics in strong current regions and near coasts. The sea surface height forecast skill of the model is assessed. Model forecasts using climatological forcing and boundary conditions are more skillful than climatology out to 50 days compared to persistence, which is a more skillful forecast than climatology out to approximately 20 days. Hindcasts using reanalysis products for atmospheric forcing and open boundary conditions are more skillful than climatology for approximately 120 days or longer, with the exact time scale depending on the accuracy of the state estimate used for initializing and on the reanalysis forcing. Estimating the model representational error is a goal of these experiments.
Keywords:
[+]
Atmospheric Science Ocean Engineering
Source:
Journal of Atmospheric and Oceanic Technology, 34(7), 1501-1517
DOI:
https://doi.org/10.1175/jtech-d-16-0223.1
ISSN:
0739-0572;1520-0426;
Format:
PDF
Publisher:
American Meteorological Society
Document Type:
Journal Article
Funding:
Grant no. NA13OAR4830216
Rights Information:
Other
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:6ca0601e78d97a69fe33ba73c6e45400183d05229f51d36f6c8ac702974a0c61
Download URL:
https://repository.library.noaa.gov/view/noaa/59917/noaa_59917_DS1.pdf
File Type:

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