@article{fdi:010063115, title = {{I}nfluence of surface forcing on near-surface and mixing layer turbulence in the tropical {I}ndian {O}cean}, author = {{C}allaghan, {A}. {H}. and {W}ard, {B}. and {V}ialard, {J}{\'e}r{\^o}me}, editor = {}, language = {{ENG}}, abstract = {{A}n autonomous upwardly-moving microstructure profiler was used to collect measurements of the rate of dissipation of turbulent kinetic energy (epsilon) in the tropical {I}ndian {O}cean during a single diurnal cycle, from about 50 m depth to the sea surface. {T}his dataset is one of only a few to resolve upper ocean epsilon over a diurnal cycle from below the active mixing layer up to the air-sea interface. {W}ind speed was weak with an average value of similar to 5 m s(-1) and the wave field was swell-dominated. {W}ithin the wind and wave affected surface layer ({WWSL}), epsilon values were on the order of 10(-7)-10(-6) {W} kg(-1) at a depth of 0.75 m and when averaged, were almost a factor of two above classical law of the wall theory, possibly indicative of an additional source of energy from the wave field. {B}elow this depth, epsilon values were closer to wall layer scaling, suggesting that the work of the {R}eynolds stress on the wind-induced vertical shear was the major source of turbulence within this layer. {N}o evidence of persistent elevated near-surface epsilon characteristic of wave-breaking conditions was found. {P}rofiles collected during night-time displayed relatively constant epsilon values at depths between the {WWSL} and the base of the mixing layer, characteristic of mixing by convective overturning. {W}ithin the remnant layer, depth-averaged values of epsilon started decaying exponentially with an e-folding time of 47 min, about 30 min after the reversal of the total surface net heat flux from oceanic loss to gain.}, keywords = {{D}issipation of turbulent kinetic energy ; {N}ear-surface turbulence ; {R}emnant layer ; {D}issipation decay time ; {A}ir-{S}ea {I}nteraction {P}rofiler ({ASIP}) ; {D}iurnal cycle ; {W}ind-driven mixing ; {C}onvectively-driven mixing ; {OCEAN} {INDIEN} ; {ZONE} {TROPICALE}}, booktitle = {}, journal = {{D}eep-{S}ea {R}esearch {P}art {I} : {O}ceanographic {R}esearch {P}apers}, volume = {94}, numero = {}, pages = {107--123}, ISSN = {0967-0637}, year = {2014}, DOI = {10.1016/j.dsr.2014.08.009}, URL = {https://www.documentation.ird.fr/hor/fdi:010063115}, }