caa a22 4500 605546371 CHVBK 20210128100940.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10236-014-0766-x doi (NATIONALLICENCE)springer-10.1007/s10236-014-0766-x Interpretation of coastal wind transfer functions with momentum balances derived from idealized numerical model simulations [Elektronische Daten] [Sung Kim, Ganesh Gopalakrishnan, Aurelien Ponte] 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. Springer-Verlag Berlin Heidelberg, 2014 Coastal wind-current system nationallicence Surface circulation nationallicence Subsurface circulation nationallicence Anisotropic transfer function nationallicence Anisotropic response function nationallicence Momentum balance nationallicence Statistical analysis nationallicence Inverse model nationallicence Kim Sung 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 aut Gopalakrishnan Ganesh Climate, Atmospheric Science and Physical Oceanography, Scripps Institution of Oceanography, 9500 Gilman Dr., 92093, La Jolla, CA, USA aut Ponte Aurelien Laboratoire de Physique des Océans, IFREMER-CNRS-IRD-UBO, 29280, Plouzané, France aut Ocean Dynamics Springer Berlin Heidelberg 65/1(2015-01-01), 115-141 1616-7341 65:1<115 2015 65 10236 https://doi.org/10.1007/s10236-014-0766-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10236-014-0766-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Sung 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 aut NATIONALLICENCE 700 1- Gopalakrishnan Ganesh Climate, Atmospheric Science and Physical Oceanography, Scripps Institution of Oceanography, 9500 Gilman Dr., 92093, La Jolla, CA, USA aut NATIONALLICENCE 700 1- Ponte Aurelien Laboratoire de Physique des Océans, IFREMER-CNRS-IRD-UBO, 29280, Plouzané, France aut NATIONALLICENCE 773 0- Ocean Dynamics Springer Berlin Heidelberg 65/1(2015-01-01), 115-141 1616-7341 65:1<115 2015 65 10236