The Impact of High-Frequency Weather Systems on SST and Surface Mixed Layer in the Central Arabian Sea

Shenjie Zhou (Lead Author), Xiaoming Zhai, Ian Renfrew

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
11 Downloads (Pure)

Abstract

The role of high-frequency (sub-daily time scales) weather systems in modulating the sea surface temperature (SST) and the mixed layer (ML) depth in the central Arabian Sea is investigated using one-dimensional mixed-layer models for different monsoon seasons. Simulations forced by sub-hourly sampled meteorological variables, including surface wind, air temperature, humidity and cloud, are compared to simulations forced by daily-averaged meteorological variables. It is found that including high-frequency signals in the meteorological variables lowers the daily-mean SST (by 0.8°C on average) and damps its variability (the standard deviation decreases by 1.0°C), but has little systematic effect on the SST diurnal variability. There is a small but consistent deepening of the ML depth associated with the slightly intensified wind stress and heat loss due to high-frequency weather systems at this site. The cooling effect on the daily-mean SST is found to be closely related to the ML depth on daily-to-seasonal time scales. The impact of high-frequency weather systems is primarily driven by the high-frequency wind via the turbulent heat and momentum fluxes.
Original languageEnglish
Pages (from-to)1091-1104
JournalJournal of Geophysical Research - Oceans
Volume123
Issue number2
Early online date19 Jan 2018
DOIs
Publication statusPublished - Feb 2018

Keywords

  • high-frequency weather systems
  • sea surface temperature
  • mixed layer depth
  • Arabian Sea

Cite this