NDLI: High-resolution modeling of the mean flow and meso-scale eddy variability around the Grand Banks of Newfoundland

Content Provider	Springer Nature Link
Author	Zhai, Li Lu, Youyu Higginson, Simon Davidson, Fraser Dupont, Frédéric Roy, François Chanut, Jérôme Smith, Gregory C.
Copyright Year	2015
Abstract	The mean flow and meso-scale eddy variability in the region around the Grand Banks of Newfoundland (GBN) are quantified by analyzing surface drifter observations, mean dynamic topography (MDT), along-track satellite altimeter observations, and the solutions of two high-resolution ocean models. By increasing the horizontal resolution from 6.5 km (CREG12) to 2.2 km (GBN36), the modeled mean kinetic energy (MKE) decreases and the eddy kinetic energy (EKE) increases in the study area. GBN36 obtains the MKE of surface geostrophic currents and total currents similar to that derived from MDT and drifter data, whereas CREG12 overestimates these quantities by 40–53 %. CREG12 and GBN36 underestimate the EKE of surface geostrophic currents by 46 and 30 %, respectively, with respect to the EKE derived from along-track altimeter data. The models do not reproduce the strong eddy activity in the Gulf Stream and its downstream region, possibly related to a northward shift of the Gulf Stream position by 0.5° in latitude compared with observations. Both models obtain wavenumber spectra of sea level anomaly in close agreement with the spectrum derived from along-track altimeter data, with a slope of −5 at wavelengths near 100 km on logarithmic spectral density scales.
Starting Page	877
Ending Page	887
Page Count	11
File Format	PDF
ISSN	16167341
Journal	Deutsche Hydrografische Zeitschrift
Volume Number	65
Issue Number	6
e-ISSN	16167228
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-04-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Grand Banks of Newfoundland Ocean circulation Meso-scale eddy Kinetic energy North Atlantic current Regional ocean model Oceanography Geophysics/Geodesy Atmospheric Sciences Fluid- and Aerodynamics Environmental Monitoring/Analysis
Content Type	Text
Resource Type	Article
Subject	Oceanography

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