Interpretation of coastal wind transfer functions with momentum balances derived from idealized numerical model simulations

Verfasser / Beitragende:
[Sung Kim, Ganesh Gopalakrishnan, Aurelien Ponte]
Ort, Verlag, Jahr:
2015
Enthalten in:
Ocean Dynamics, 65/1(2015-01-01), 115-141
Format:
Artikel (online)
ID: 605546371
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024 7 0 |a 10.1007/s10236-014-0766-x  |2 doi 
035 |a (NATIONALLICENCE)springer-10.1007/s10236-014-0766-x 
245 0 0 |a Interpretation of coastal wind transfer functions with momentum balances derived from idealized numerical model simulations  |h [Elektronische Daten]  |c [Sung Kim, Ganesh Gopalakrishnan, Aurelien Ponte] 
520 3 |a The local wind-driven circulation off southern San Diego is addressed with two complementary statistical and dynamical frameworks based on observations and idealized numerical model simulations. The observations including surface currents from high-frequency radars, subsurface currents from a nearshore mooring, and wind records at a local wind station are analyzed with the idealized ocean model (MITgcm) simulations using realistic bottom topography and spatially uniform wind stress forcing. Statistically estimated anisotropic local wind transfer functions characterize the observed oceanic spectral response to wind stress separately in the x (east-west) and y (north-south) directions. We delineate the coastal circulation at three primary frequencies [low (σ L=0.0767 cycles per day (cpd)), diurnal (σ D=1 cpd), and inertial (σ f=1.07 cpd) frequencies] with the momentum budget equations and transfer functions. At low frequency, the magnitudes of transfer functions are enhanced near the coast, attributed to geostrophic balance between wind-driven pressure gradients and the Coriolis force on currents. The response diminishes away from the coast, returning to the balance between frictional and Coriolis terms, as in the classic Ekman model. On the contrary, transfer functions in the near-inertial frequency band show reduced magnitudes near the coast primarily due to friction, but exhibits the enhanced seaward response as a result of the inertial resonance. The idealized model simulations forced by local wind stress can identify the influences of remote wind stress and the biases in the data-derived transfer functions. 
540 |a Springer-Verlag Berlin Heidelberg, 2014 
690 7 |a Coastal wind-current system  |2 nationallicence 
690 7 |a Surface circulation  |2 nationallicence 
690 7 |a Subsurface circulation  |2 nationallicence 
690 7 |a Anisotropic transfer function  |2 nationallicence 
690 7 |a Anisotropic response function  |2 nationallicence 
690 7 |a Momentum balance  |2 nationallicence 
690 7 |a Statistical analysis  |2 nationallicence 
690 7 |a Inverse model  |2 nationallicence 
700 1 |a Kim  |D Sung  |u Division of Ocean Systems Engineering, School of Mechanical, Aerospace, and Systems Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, 305-701, Yuseong-gu, Daejeon, Republic of Korea  |4 aut 
700 1 |a Gopalakrishnan  |D Ganesh  |u Climate, Atmospheric Science and Physical Oceanography, Scripps Institution of Oceanography, 9500 Gilman Dr., 92093, La Jolla, CA, USA  |4 aut 
700 1 |a Ponte  |D Aurelien  |u Laboratoire de Physique des Océans, IFREMER-CNRS-IRD-UBO, 29280, Plouzané, France  |4 aut 
773 0 |t Ocean Dynamics  |d Springer Berlin Heidelberg  |g 65/1(2015-01-01), 115-141  |x 1616-7341  |q 65:1<115  |1 2015  |2 65  |o 10236 
856 4 0 |u https://doi.org/10.1007/s10236-014-0766-x  |q text/html  |z Onlinezugriff via DOI 
898 |a BK010053  |b XK010053  |c XK010000 
900 7 |a Metadata rights reserved  |b Springer special CC-BY-NC licence  |2 nationallicence 
908 |D 1  |a research-article  |2 jats 
949 |B NATIONALLICENCE  |F NATIONALLICENCE  |b NL-springer 
950 |B NATIONALLICENCE  |P 856  |E 40  |u https://doi.org/10.1007/s10236-014-0766-x  |q text/html  |z Onlinezugriff via DOI 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Kim  |D Sung  |u Division of Ocean Systems Engineering, School of Mechanical, Aerospace, and Systems Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, 305-701, Yuseong-gu, Daejeon, Republic of Korea  |4 aut 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Gopalakrishnan  |D Ganesh  |u Climate, Atmospheric Science and Physical Oceanography, Scripps Institution of Oceanography, 9500 Gilman Dr., 92093, La Jolla, CA, USA  |4 aut 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Ponte  |D Aurelien  |u Laboratoire de Physique des Océans, IFREMER-CNRS-IRD-UBO, 29280, Plouzané, France  |4 aut 
950 |B NATIONALLICENCE  |P 773  |E 0-  |t Ocean Dynamics  |d Springer Berlin Heidelberg  |g 65/1(2015-01-01), 115-141  |x 1616-7341  |q 65:1<115  |1 2015  |2 65  |o 10236