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      https://www.ias.ac.in/article/fulltext/jess/130/0126

    • Keywords

       

      Sea breeze; diurnal variation; monsoon; synoptic wind.

    • Abstract

       

      Land and sea breezes are formed due to differential heating between land and sea surfaces and are prominent local circulation in the tropical region. We present the first observational analysis of the overview of sea-breeze characteristics based on Automatic Weather Station (AWS) data and radiosonde ascends at Bachok Marine Research Station in peninsular Malaysia. Onset criteria for sea breeze were defined based on the variations of Sea Breeze Component (SBC). Associated parameters such as surface wind direction, wind speed, humidity, and air temperature are analysed for 3 yrs (2015–2017) from the AWS. The radiosonde data taken during two field experiments during northeast monsoon and southwest monsoon are utilised to investigate the impact of monsoons on the sea breeze in greater detail. The influence of synoptic-scale motion on the sea breeze is also investigated using radiosonde and reanalysis data. Generally, the sea breeze sets in from the east at about 10:00 AM and occasionally, prevailing monsoon flow intruded into the local circulation. An increase in station pressure is noted during the onset. The time of onset, as well as the strength of the sea breeze, is influenced by conditions such as clear, cloudy, partially cloudy days and the presence of thunderstorms.

      $\bf{Highlights}$

      $\bullet$ First time observation of the sea breeze circulation over the northeast peninsular Malaysia during different seasons.

      $\bullet$ Detailed spatial and vertical structure of sea breeze and its evolution are studied.

      $\bullet$ Combined use of AWS data and radiosonde data in addition to the reanalysis data are brought out for the sea breeze analysis.

      $\bullet$ Diurnal and seasonal variation of sea breeze component was used for understanding the onset and evolution of sea breeze.

    • Author Affiliations

       

      P R JAYAKRISHNAN1 2 P SIVAPRASAD1 SHEEBA NETTUKANDY CHENOLI1 3 4 C A BABU5 AZIZAN ABU SAMAH1 3 4 N P MOHAMMEDALI6

      1. Institute of Ocean and Earth Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia.
      2. College of Climate Change and Environmental Science (CCCES), Vellanikkara, Thrissur 680 656, India.
      3. Department of Geography, Faculty of Arts and Social Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia.
      4. National Antarctic Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia.
      5. Department of Atmospheric Sciences, Cochin University of Science and Technology, Cochin 682 016, India.
      6. Department of Marine Science, Bharathidasan University, Tiruchirappalli 620 024, India.
    • Dates

       
  • Journal of Earth System Science | News

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