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Title: Impact of data assimilation on Eulerian versus Lagrangian estimates of upper ocean transport

Using four-dimensional variational analysis, we produce an estimate of the state of a coastalregion in Northern Norway during the late winter and spring in 1984. We use satellite sea surface tempera-ture and in situ observations from a series of intensive field campaigns, and obtain a more realistic distribu-tion of water masses both in the horizontal and the vertical than a pure downscaling approach can achieve.Although the distribution of Eulerian surface current speeds are similar, we find that they are more variableand less dependent on model bathymetry in our reanalysis compared to a hindcast produced using thesame modeling system. Furthermore, Lagrangian drift currents on the other hand are significantly changed, with overallhigher kinetic energy levels in the reanalysis than in the hindcast, particularly in the superinertial frequencyband.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Norwegian Meteorological Institute, Oslo (Norway)
Publication Date:
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Oceans
Additional Journal Information:
Journal Volume: 122; Journal Issue: 7; Journal ID: ISSN 2169-9275
Publisher:
American Geophysical Union
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; surface drift; stratification; data assimilation; ocean transport; Lagrangian model; Norwegian shelf
OSTI Identifier:
1461513

Sperrevik, Ann Kristin, Rohrs, Johannes, and Christensen, Kai Hakon. Impact of data assimilation on Eulerian versus Lagrangian estimates of upper ocean transport. United States: N. p., Web. doi:10.1002/2016JC012640.
Sperrevik, Ann Kristin, Rohrs, Johannes, & Christensen, Kai Hakon. Impact of data assimilation on Eulerian versus Lagrangian estimates of upper ocean transport. United States. doi:10.1002/2016JC012640.
Sperrevik, Ann Kristin, Rohrs, Johannes, and Christensen, Kai Hakon. 2017. "Impact of data assimilation on Eulerian versus Lagrangian estimates of upper ocean transport". United States. doi:10.1002/2016JC012640. https://www.osti.gov/servlets/purl/1461513.
@article{osti_1461513,
title = {Impact of data assimilation on Eulerian versus Lagrangian estimates of upper ocean transport},
author = {Sperrevik, Ann Kristin and Rohrs, Johannes and Christensen, Kai Hakon},
abstractNote = {Using four-dimensional variational analysis, we produce an estimate of the state of a coastalregion in Northern Norway during the late winter and spring in 1984. We use satellite sea surface tempera-ture and in situ observations from a series of intensive field campaigns, and obtain a more realistic distribu-tion of water masses both in the horizontal and the vertical than a pure downscaling approach can achieve.Although the distribution of Eulerian surface current speeds are similar, we find that they are more variableand less dependent on model bathymetry in our reanalysis compared to a hindcast produced using thesame modeling system. Furthermore, Lagrangian drift currents on the other hand are significantly changed, with overallhigher kinetic energy levels in the reanalysis than in the hindcast, particularly in the superinertial frequencyband.},
doi = {10.1002/2016JC012640},
journal = {Journal of Geophysical Research. Oceans},
number = 7,
volume = 122,
place = {United States},
year = {2017},
month = {6}
}