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Observation of the surface horizontal thermohaline variability at mesoscale to submesoscale in the north‐eastern subtropical A tlantic O cean
Author(s) -
Kolodziejczyk Nicolas,
Reverdin Gilles,
Boutin Jacqueline,
Hernandez Olga
Publication year - 2015
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
eISSN - 2169-9291
pISSN - 2169-9275
DOI - 10.1002/2014jc010455
Subject(s) - mesoscale meteorology , thermohaline circulation , salinity , subtropical front , geology , transect , temperature salinity diagrams , climatology , wavelength , isopycnal , atmospheric sciences , oceanography , water mass , physics , optoelectronics
The seasonal variability of the surface horizontal thermohaline structure is investigated in the north‐eastern Atlantic Surface Salinity Maximum (SSM) at length scales from five to hundreds of kilometers, i.e., at submesoscale to mesoscale. The near‐surface temperature and salinity data from merchant ship thermosalinograph (TSG) transects across the Atlantic are used to compute the horizontal temperature, salinity and density fluctuations, and the density ratio. During late winter in the north‐eastern SSM, thermohaline compensation is observed for wavelengths from 5 km to more than 200 km; in spite of large and sharp surface thermohaline fronts, a weak density surface horizontal gradient is observed. Temperature and salinity exhibit an energetic spectra in k −2 slope scale between 20–100 km scale and a steeper slope at shorter wavelengths, while density spectra exhibit lower energy level with a clear k −3 slope below 20 km, consistent with interior quasigeostrophic turbulence. During summer in the north‐eastern SSM, salinity and temperature gradients are no longer compensated due to strong atmospheric heating of the upper ocean. In comparison with winter, the surface density spectrum is enhanced with a flatter slope between k −2 and k −1 between 5 and 20 km.