Indian Ocean Dipole modulated wave climate of eastern Arabian Sea

Abstract. Intrinsic modes of variability have a significant role in driving the climatic oscillations in the oceanic processes. In this paper, we investigate the influence of an inter-annual mode of variability, the Indian Ocean Dipole (IOD), on the wave climate of the eastern Arabian Sea (AS). Using measured, modeled and reanalysis wave data and reanalysis wind data, we show that the IOD plays a major role in the variability of wave climate of the study region. Due to the IOD-induced changes in equatorial sea surface temperature and sea level pressure, the winds from the northern AS gets modified and cause inter-annual variability in the wave climate over the eastern AS. The changes in wind field over the AS due to the IOD influence the generation or dissipation of the wave field and hence cause a decrease in northwest short-period waves during positive IOD and an increase during negative IOD.

[1]  C. Fairall,et al.  Upward Momentum Transfer in the Marine Boundary Layer , 2001 .

[2]  T. Barnett,et al.  Measurements of wind-wave growth and swell decay during the Joint North Sea Wave Project (JONSWAP) , 1973 .

[3]  Changes in nearshore waves during the active sea/land breeze period off Vengurla, central west coast of India , 2016 .

[4]  M. Rienecker,et al.  Indian Ocean warming of 1997-1998 , 2000 .

[5]  P. N. Vinayachandran,et al.  Indian Ocean Dipole: Processes and impacts , 2009 .

[6]  Hendrik L. Tolman,et al.  A Third-Generation Model for Wind Waves on Slowly Varying, Unsteady, and Inhomogeneous Depths and Currents , 1991 .

[7]  V. Sanil Kumar,et al.  Performance of ERA-Interim Wave Data in the Nearshore Waters around India* , 2015 .

[8]  K. Hasselmann,et al.  On the Existence of a Fully Developed Wind-Sea Spectrum , 1984 .

[9]  G. Reverdin.  Convergence in the equatorial surface jets of the Indian Ocean , 1985 .

[10]  T. Nair,et al.  Observational Evidence of Summer Shamal Swells along the West Coast of India , 2013 .

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

[12]  N. Booij,et al.  A third-generation wave model for coastal regions-1 , 1999 .

[13]  P. Vinayachandran,et al.  Signatures of Indian Ocean Dipole and El Niño–Southern Oscillation events in sea level variations in the Bay of Bengal , 2012 .

[14]  S. Hastenrath,et al.  Dynamics of the surface wind field over the equatorial Indian Ocean , 2004 .

[15]  Julia Slingo,et al.  1997: The El Niño of the Century and the Response of the Indian Summer Monsoon , 2000 .

[16]  Hendrik L. Tolman,et al.  Source Terms in a Third-Generation Wind Wave Model , 1996 .

[17]  Debasis Sengupta,et al.  First results from a new observational system over the Indian seas , 2000 .

[18]  I. Young,et al.  The decay rate of ocean swell observed by altimeter , 2013 .

[19]  I. Young,et al.  Changes in ocean surface wind with a focus on trends in regional and monthly mean values , 2014 .

[20]  M. Latif,et al.  On Dipolelike Variability of Sea Surface Temperature in the Tropical Indian Ocean , 2002 .

[21]  NOTES AND CORRESPONDENCE On Dipolelike Variability of Sea Surface Temperature in the Tropical Indian Ocean , 2002 .

[22]  N. Booij,et al.  A third‐generation wave model for coastal regions: 2. Verification , 1999 .

[23]  J. Bidlot,et al.  User manual and system documentation of WAVEWATCH III R version 4.18 , 2014 .

[24]  P. Sreenivas,et al.  Influence of El Niño and Indian Ocean Dipole on sea level variability in the Bay of Bengal , 2012 .

[25]  Y. Masumoto,et al.  Interannual subsurface variability in the tropical Indian Ocean with a special emphasis on the Indian Ocean Dipole , 2002 .

[26]  K. Wyrtki,et al.  Oceanographic atlas of the International Indian Ocean Expedition , 1971 .

[27]  S. Belcher,et al.  Wave-Driven Wind Jets in the Marine Atmospheric Boundary Layer , 2008 .

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

[29]  B. Goswami,et al.  A dipole mode in the tropical Indian Ocean , 1999, Nature.

[30]  Two flavors of the Indian Ocean Dipole , 2014, Climate Dynamics.

[31]  Bertrand Chapron,et al.  Observation of swell dissipation across oceans , 2008, 0809.2497.

[32]  T. Nair,et al.  Monsoon and cyclone induced wave climate over the near shore waters off Puduchery, south western Bay of Bengal , 2013 .

[33]  H. B. Menon,et al.  On the dominance of pre-existing swells over wind seas along the west coast of India , 2011 .

[34]  A study on reflection pattern of swells from the shoreline of peninsular India , 2014, Natural Hazards.

[35]  W. Han,et al.  Influence of the Indian Ocean Dipole on Atmospheric Subseasonal Variability , 2005 .

[36]  L. Isaksen,et al.  The ERA-40 Reanalysis , 2004 .

[37]  Antonio J. Busalacchi,et al.  Oceanic processes associated with anomalous events in the Indian Ocean with relevance to 1997–1998 , 2000 .

[38]  Inter-annual variations in wave spectral characteristics at a location off the central west coast of India , 2015 .

[39]  Peter J. Webster,et al.  Coupled ocean–atmosphere dynamics in the Indian Ocean during 1997–98 , 1999, Nature.

[40]  C. Amante,et al.  ETOPO1 arc-minute global relief model : procedures, data sources and analysis , 2009 .

[41]  T. R. Anoop,et al.  Surface Wave Climatology and Its Variability in the North Indian Ocean Based on ERA-Interim Reanalysis* , 2015 .

[42]  N. Saji,et al.  Structure of SST and Surface Wind Variability during Indian Ocean Dipole Mode Events: COADS Observations* , 2003 .

[43]  I. Young.  Global ocean wave statistics obtained from satellite observations , 1994 .

[44]  S. Shetye,et al.  Impact of sea breeze on wind-seas off Goa, west coast of India , 2006 .

[45]  P. R. Shanas,et al.  Shallow water wave spectral characteristics along the eastern Arabian Sea , 2013, Natural Hazards.

[46]  T. Nair,et al.  Influence of winds on temporally varying short and long period gravity waves in the near shore regions of the eastern Arabian Sea , 2012 .

[47]  V. Sanil Kumar,et al.  Temporal variations in the wind and wave climate at a location in the eastern Arabian Sea based on ERA-Interim reanalysis data , 2013 .

[48]  M. Mcphaden,et al.  TropFlux: air-sea fluxes for the global tropical oceans—description and evaluation , 2012, Climate Dynamics.

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