Interannual variability in potential impacts of upper ocean salinity on sea surface cooling induced by tropical cyclones in the northwestern Pacific.
| Title: | Interannual variability in potential impacts of upper ocean salinity on sea surface cooling induced by tropical cyclones in the northwestern Pacific. |
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| Authors: | Miyagi, Rintaro1 (AUTHOR) rintaro.miyagi@eps.s.u-tokyo.ac.jp, Tozuka, Tomoki1 (AUTHOR) |
| Source: | Climate Dynamics. Nov2024, Vol. 62 Issue 11, p10233-10245. 13p. |
| Subject Terms: | *HALOCLINE, *SOUTHERN oscillation, *SEAWATER salinity, *TROPICAL cyclones, *TYPHOONS, EL Nino, LA Nina |
| Abstract: | Using a new measure that relates tropical cyclone (TC)-induced sea surface cooling with the strength of TCs, interannual variations in potential impacts of the upper ocean stratification on TC-induced sea surface cooling associated with the evolution of El Niño/Southern Oscillation (ENSO) are investigated in the northwestern Pacific using an ocean reanalysis product, with a special focus on haline effects. It is found that the haline stratification could suppress the sea surface cooling by as much as 20% to the south of 20°N in the peak typhoon season (July-October), and this contribution is different between their developing years (September-October) and decaying years (July-August). More specifically, the haline effects may vary up to 25% (40%) during the decaying years of El Niño (La Niña). Due to anomalous haline effects, the region to the west of 160°E is susceptible to the sea surface cooling during the developing and decaying years of El Niño, while the cooling could be suppressed in this region during the decaying years of La Niña. Although the effects of haline stratification have been found less important than those of thermal stratification, potential impacts of the upper ocean salinity on TC-induced sea surface cooling associated with the ENSO have been quantitatively estimated for the first time. Since the main focus of this paper is to present the new measure and discuss potential impacts of the upper ocean salinity stratification, further verifications need to be conducted once more observational data is accumulated or through numerical simulations. [ABSTRACT FROM AUTHOR] |
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| Database: | Academic Search Complete |
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