Waves along Eastern boundary currents – The regional winds effect

Abstract The wind fields along the five eastern boundary currents (EBC) systems (California, Canary, Humboldt, Benguela, and West Australia) are highly seasonal. This seasonality is mostly determined by the position of the semi-permanent high pressure cells over the ocean. During summer these high pressure cells, with a thermal low pressure systems inland, are the synoptic drivers of along coast winds. These strong summer winds, along the EBC systems, off-shore mid-latitude continental coasts, generate waves that can be rather extreme, considering that these areas can be seen as limited fetch wave fields. A qualitative analysis of the wave climate over the mid-latitudes western coastal areas, along the five EBC systems, based on the ERA-Interim reanalysis wave data, is presented. The influence of coastal wind speed intensification processes in these areas, like the occurrence of coastal low-level jets, and expansion fans in the lee of headlands and capes, on the local wave field is studied. It is shown that, despite the distance between the five EBC systems, their wave fields, particularly during summer, are very similar when the wind sea and swell characteristics are balanced. In summer locally generated wave heights and energy content, along EBC areas, are comparable or even higher than swell ones.

[1]  J. Stopa,et al.  Intercomparison of wind and wave data from the ECMWF Reanalysis Interim and the NCEP Climate Forecast System Reanalysis , 2014 .

[2]  P. Miranda,et al.  Climate change and upwelling: response of Iberian upwelling to atmospheric forcing in a regional climate scenario , 2013, Climate Dynamics.

[3]  P. Soares,et al.  A Global View of Coastal Low-Level Wind Jets Using an Ensemble of Reanalyses , 2017 .

[4]  Pedro M. A. Miranda,et al.  Spatial and temporal variability of the Iberian Peninsula coastal low‐level jet , 2018 .

[5]  Kimmo K. Kahma,et al.  Wave-Induced Wind in the Marine Boundary Layer , 2009 .

[6]  Arthur Beiser,et al.  Surveys in mechanics , 1956 .

[7]  M. Tjernström,et al.  Structure and variability of the Oman coastal low-level jet , 2015 .

[8]  A. Sterl,et al.  On the (In)Homogeneity of Reanalysis Products , 2004 .

[9]  Anna Rutgersson,et al.  A Global View on the Wind Sea and Swell Climate and Variability from ERA-40 , 2011 .

[10]  A. Rutgersson,et al.  Variability of Wind Sea and Swell Waves in the North Atlantic Based on ERA-40 Re-analysis , 2009 .

[11]  S. Caires,et al.  100-Year Return Value Estimates for Ocean Wind Speed and Significant Wave Height from the ERA-40 Data , 2005 .

[12]  Nobuhito Mori,et al.  Projected changes in wave climate from a multi-model ensemble , 2013 .

[13]  Detection and Attribution of Climate Change Signal in Ocean Wind Waves , 2015 .

[14]  S. Hughes,et al.  The role of environmental and fisheries multi-controls in white seabream (Diplodus sargus) artisanal fisheries in Portuguese coast , 2014, Regional Environmental Change.

[15]  T. Gerling,et al.  Partitioning Sequences and Arrays of Directional Ocean Wave Spectra into Component Wave Systems , 1992 .

[16]  S. Caires,et al.  Climatology, variability and extrema of ocean waves: the Web‐based KNMI/ERA‐40 wave atlas , 2005 .

[17]  G. Ivey,et al.  Upwelling on the south-west coast of Australia—source of the Capes Current? , 1999 .

[18]  J. Thepaut,et al.  The ERA‐Interim reanalysis: configuration and performance of the data assimilation system , 2011 .

[19]  William M. Drennan,et al.  Observational Study of Marine Atmospheric Boundary Layer Characteristics during Swell , 2009 .

[20]  Jose-Henrique G. M. Alves,et al.  Revisiting the Pierson–Moskowitz asymptotic limits for fully developed wind waves , 2003 .

[21]  Jeffrey L. Hanson,et al.  Automated Analysis of Ocean Surface Directional Wave Spectra , 2001 .

[22]  W. Munk,et al.  Directional recording of swell from distant storms , 1963, Philosophical transactions of the Royal Society of London. Series A: Mathematical and physical sciences.

[23]  D. Dee,et al.  Variational bias correction of satellite radiance data in the ERA‐Interim reanalysis , 2009 .

[24]  C. R. Bullen,et al.  An overview of recent technologies on wave and current measurement in coastal and marine applications , 2010 .

[25]  Øyvind Breivik,et al.  Marine Wind and Wave Height Trends at Different ERA-Interim Forecast Ranges , 2015 .

[26]  Fabrice Ardhuin,et al.  On the Interaction of Surface Waves and Upper Ocean Turbulence , 2006 .

[27]  M. J. Chinita,et al.  Climatology of the Iberia coastal low-level wind jet: weather research forecasting model high-resolution results , 2014 .

[28]  A. Sterl,et al.  Projection of Global Wave Climate Change toward the End of the Twenty-First Century , 2012 .

[29]  Ø. Saetra,et al.  Global surface wave drift climate from ERA-40: the contributions from wind-sea and swell , 2014, Ocean Dynamics.

[30]  A Bakun,et al.  Global Climate Change and Intensification of Coastal Ocean Upwelling , 1990, Science.

[31]  Luigi Cavaleri,et al.  Wind Waves in the Coupled Climate System , 2012 .

[32]  W. Pierson,et al.  A proposed spectral form for fully developed wind seas based on the similarity theory of S , 1964 .

[33]  M. Schulz,et al.  Trends in coastal upwelling intensity during the late 20th century , 2010 .

[34]  P. Chang,et al.  Structure and dynamics of the Benguela low-level coastal jet , 2017, Climate Dynamics.

[35]  F. Qiao,et al.  Surface waves and wave‐coupled effects in lower atmosphere and upper ocean , 2012 .

[36]  M. Tjernström,et al.  Modelling coastal low-level wind-jets: does horizontal resolution matter? , 2016, Meteorology and Atmospheric Physics.

[37]  Bertrand Chapron,et al.  A Global View of Swell and Wind Sea Climate in the Ocean by Satellite Altimeter and Scatterometer , 2002 .

[38]  Hans Bergström,et al.  A case study of air‐sea interaction during swell conditions , 1999 .

[39]  Alexander V. Babanin.  Breaking and Dissipation of Ocean Surface Waves , 2011 .

[40]  Clinton D. Winant,et al.  The Marine Layer off Northern California: An Example of Supercritical Channel Flow , 1988 .

[41]  P. Janssen.  The Interaction of Ocean Waves and Wind , 2004 .

[42]  James C. McWilliams,et al.  Large-Eddy Simulations and Observations of Atmospheric Marine Boundary Layers above Nonequilibrium Surface Waves , 2008 .

[43]  I. Young.  Seasonal variability of the global ocean wind and wave climate , 1999 .

[44]  M. Tjernström,et al.  Global distribution and seasonal variability of coastal low-level jets derived from ERA-Interim reanalysis , 2013 .

[45]  C. Friehe,et al.  Dynamical coupling of wind and ocean waves through wave-induced air flow , 2003, Nature.

[46]  Pedro M. M. Soares,et al.  Western Iberian offshore wind resources: More or less in a global warming climate? , 2017 .

[47]  James C. McWilliams,et al.  The Wave-Driven Ocean Circulation , 1999 .

[48]  H. Potter.  Swell and the drag coefficient , 2015, Ocean Dynamics.

[49]  Stephen E. Belcher,et al.  A Global Climatology of Wind–Wave Interaction , 2010 .

[50]  D. L. Harris,et al.  The Wave-Driven Wind , 1966 .

[51]  L. Cavaleri,et al.  Wind wave cast in the Mediterranean Sea , 1991 .

[52]  J. Bidlot,et al.  IMPACT AND FEEDBACK OF OCEAN WAVES ON THE ATMOSPHERE by P A , 2001 .

[53]  P. Soares,et al.  The impact of climate change on the Iberian low-level wind jet: EURO-CORDEX regional climate simulation , 2015 .

[54]  W. A. Oost,et al.  On the sea state dependence of the Charnock parameter , 1998 .

[55]  Carlos Guedes Soares,et al.  The wind sea and swell waves climate in the Nordic seas , 2015, Ocean Dynamics.

[56]  A. Sterl,et al.  The ERA‐40 re‐analysis , 2005 .

[57]  G. Vallis.  Large-Scale Circulation and Production of Stratification: Effects of Wind, Geometry, and Diffusion , 2000 .

[58]  P. Soares,et al.  High resolution projections for the western Iberian coastal low level jet in a changing climate , 2017, Climate Dynamics.

[59]  R. Nicholls,et al.  A global analysis of human settlement in coastal zones , 2003 .

[60]  A. Smedman,et al.  Comments on “A Global Climatology of Wind–Wave Interaction” , 2011 .

[61]  C. Dorman,et al.  Local atmospheric forcing during the Coastal Ocean Dynamics Experiment: 1. A description of the marine boundary layer and atmospheric conditions over a northern California upwelling region , 1987 .

[62]  William M. Drennan,et al.  Air–Sea Interaction Features in the Baltic Sea and at a Pacific Trade-Wind Site: An Inter-comparison Study , 2013, Boundary-Layer Meteorology.

[63]  A. Rutgersson,et al.  Impact of surface waves in a Regional Climate Model , 2010 .

[64]  W. Munk,et al.  Propagation of ocean swell across the Pacific , 1966, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[65]  William M. Drennan,et al.  The Atmospheric Boundary Layer during Swell: A Field Study and Interpretation of the Turbulent Kinetic Energy Budget for High Wave Ages , 2009 .

[66]  Jose-Henrique G. M. Alves.  Numerical modeling of ocean swell contributions to the global wind-wave climate , 2006 .

[67]  M. Donelan,et al.  Dynamics and Modelling of Ocean Waves , 1994 .

[68]  Simulations of Supercritical Flow around Points and Capes in a Coastal Atmosphere , 2000 .

[69]  Johannes Schulz-Stellenfleth,et al.  Assessment of ERS synthetic aperture radar wave spectra retrieved from the Max‐Planck‐Institut (MPI) scheme through intercomparisons of 1 year of directional buoy measurements , 2005 .

[70]  W. Thompson,et al.  The summertime low-level jet and marine boundary layer structure along the California coast , 1996 .

[71]  Mark A. Donelan,et al.  On momentum flux and velocity spectra over waves , 1999 .

[72]  Leo H. Holthuijsen,et al.  Waves in Oceanic and Coastal Waters , 2007 .

[73]  L. Tuomi,et al.  Wave hindcast statistics in the seasonally ice-covered Baltic Sea , 2011 .

[74]  C. Reason,et al.  Coastally Trapped Wind Reversals: Progress toward Understanding , 2000 .

[75]  Fabrice Ardhuin,et al.  Wave climate in the Arctic 1992-2014: seasonality and trends , 2016 .