The influence of the barrier layer on SST response during tropical cyclone wind forcing using idealized experiments

Johna E. Rudzin, Lynn K Shay, William E Johns

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Multiple studies have shown that reduced sea surface temperature (SST) cooling occurs under tropical cyclones (TCs) where a fresh surface layer and subsurface halocline exist. Reduced SST cooling in these scenarios has been attributed to a barrier layer, an upper-ocean feature in the tropical global oceans in which a halocline resides within the isothermal mixed layer. Because upper-ocean stratification theoretically reduces ocean mixing induced by winds, the barrier layer is thought to reduce SST cooling during TC passage, sustaining heat and moisture fluxes into the storm. This research examines how both the inclusion of salinity and upper-ocean salinity stratification influences SST cooling for a variety of upper-ocean thermal regimes using one-dimensional (1D) ocean mixed layer (OML) models. The Kraus-Turner, Price-Weller-Pinkel, and Pollard-Rhines-Thompson 1D OML schemes are used to examine SST cooling and OML deepening during 30 m s-1 wind forcing (~category 1 TC) for both temperature-only and temperature-salinity stratification cases. Generally, the inclusion of salinity (a barrier layer) reduces SST cooling for all temperature regimes. However, results suggest that SST cooling sensitivities exist depending on thermal regime, salinity stratification, and the 1D OML model used. Upper-ocean thermal and haline characteristics are put into context of SST cooling with the creation of a barrier layer baroclinic wave speed to emphasize the influence of salinity stratification on upper-ocean response under TC wind forcing.

Original languageEnglish (US)
Pages (from-to)1471-1478
Number of pages8
JournalJournal of Physical Oceanography
Volume48
Issue number7
DOIs
StatePublished - Jul 1 2018

Fingerprint

wind forcing
tropical cyclone
upper ocean
sea surface temperature
cooling
mixed layer
stratification
salinity
experiment
ocean
halocline
thermal regime
baroclinic wave
moisture flux
temperature
global ocean
heat flux
surface layer

Keywords

  • Air-sea interaction
  • Ocean models
  • Oceanic mixed layer
  • Salinity
  • Tropical cyclones

ASJC Scopus subject areas

  • Oceanography

Cite this

The influence of the barrier layer on SST response during tropical cyclone wind forcing using idealized experiments. / Rudzin, Johna E.; Shay, Lynn K; Johns, William E.

In: Journal of Physical Oceanography, Vol. 48, No. 7, 01.07.2018, p. 1471-1478.

Research output: Contribution to journalArticle

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