Preprints
https://doi.org/10.5194/nhess-2017-66
https://doi.org/10.5194/nhess-2017-66

  07 Jun 2017

07 Jun 2017

Review status: this discussion paper is a preprint. It has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). The manuscript was not accepted for further review after discussion.

Cyclonic intensity study using sea level pressure estimations from Ocensat-II scatterometer winds over Bay of Bengal during 2013

C. Purna Chand1, M. Venkateswara Rao1, K. V. S. R . Prasad2, and K. H. Rao1 C. Purna Chand et al.
  • 1National Remote Sensing Centre, Hyderabad, India
  • 2Dept. of Meteorology and Oceanography, Andhra University, Visakhapatnam, India

Abstract. Sea level pressure (SLP) fields prevailing over Bay of Bengal (BoB) during Phailin, Lehar and Madi cyclones (2013) were estimated using University of Washington Planetary Boundary Layer (UWPBL) model with Oceansat-II Scatterometer (OSCAT) sea surface winds as an input parameter. Model performance in estimating SLP variations during cyclonic periods was investigated by comparison against cyclone reports of Indian Meteorological Department (IMD) and in-situ measurements. Pressure drop as per IMD reports were observed to be higher than model estimates, primarily due to limitations in scatterometer wind data. However, model retrieved pressure fields compare well against buoy measurements, with a bias of 0.0042, −0.1279 and −0.4406 observed for Phailin, Lehar and Madi cyclones respectively. The contrast in pressure drops between model estimates and IMD reports was investigated by comparing scatterometer winds against IMD reported maximum sustainable winds.

C. Purna Chand et al.

 
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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

C. Purna Chand et al.

C. Purna Chand et al.

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Short summary
This study carried out to check the variations of Sea Level Pressure (SLP) during the cyclone conditions. SLP fields are estimated using University of Washington Planetary Boundary Layer model during Phailin, Lehar and Madi, three vary severe cyclonic storms which occurred in 2013 over Bay of Bengal region. Model performance in estimating SLP variations during cyclonic periods was investigated by comparison against cyclone reports of Indian Meteorological Department and in-situ observations.
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