Observations indicative of rain-induced double diffusion in the ocean surface boundary layer

K. Walesby, J. Vialard, Peter J Minnett, A. H. Callaghan, B. Ward

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Double diffusion can result in the formation of thermohaline staircases, typically observed in the ocean interior. The observations presented here were acquired in the ocean surface boundary layer with the autonomous microstructure Air-Sea Interaction Profiler. An intense rain event (rainfall rates of up to 35 mm/h) resulted in cooler, fresher water (up to 0.15 practical salinity unit (psu) over the upper 7-10 m) overlaying warmer, saltier water, a situation potentially conducive to double-diffusive mixing. Although not as crisp as interfaces in the interior ocean because of elevated background mixing, a total of 303 thermohaline interfaces were detected within and at the base of the fresh layer, with mean changes in temperature (T) and salinity (S) across interfaces of 20 × 10<sup>-3o</sup>C and 22 × 10<sup>-3</sup> psu, respectively. These results call for new studies to disambiguate whether such interfaces are formed through double-diffusive mixing or shear instabilities and understand any long-term impacts on near-surface stratification.

Original languageEnglish (US)
Pages (from-to)3963-3972
Number of pages10
JournalGeophysical Research Letters
Volume42
Issue number10
DOIs
StatePublished - May 28 2015

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double diffusion
ocean surface
rain
boundary layers
surface layer
sea surface
salinity
boundary layer
oceans
air water interactions
fresh water
air-sea interaction
stairways
profiler
ocean
stratification
coolers
warm water
microstructure
shear

Keywords

  • Air-Sea Interaction Profiler
  • double diffusion
  • surface ocean boundary layer

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Observations indicative of rain-induced double diffusion in the ocean surface boundary layer. / Walesby, K.; Vialard, J.; Minnett, Peter J; Callaghan, A. H.; Ward, B.

In: Geophysical Research Letters, Vol. 42, No. 10, 28.05.2015, p. 3963-3972.

Research output: Contribution to journalArticle

Walesby, K. ; Vialard, J. ; Minnett, Peter J ; Callaghan, A. H. ; Ward, B. / Observations indicative of rain-induced double diffusion in the ocean surface boundary layer. In: Geophysical Research Letters. 2015 ; Vol. 42, No. 10. pp. 3963-3972.
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