Analysis of strong wind events around Adelie Land, East Antarctica

J. Naithani, S. Argentini, G. Schayes, G. Mastrantonio

Abstract


Strong wind events at Dumont d'Urville (DdU), an East Antarctic coastal station, and Dome C, an interior station,
were studied to determine if the wind along the Adelie Land coast increases with the approach of the depression
from the west of the site or after its passage to the east of it. The events for the year 1993 were studied using
synoptic observations, mean sea level pressure charts and composite infrared satellite images. It was found that the
winds are enhanced with the approach of a depression from the west towards the DdU coast. The wind increases in
response to the decreasing pressure at the coastal site and increasing downslope pressure difference (dp). The wind
starts decreasing once the system moves to the east of DdU and the pressure at DdU starts building up, as reported
in some earlier studies. The response of wind to the approaching depression is not the same for all the events but
depends on the downslope pressure difference and the movement of the depression that is often conditioned by
the presence of a blocking high to the northeast. The wind comes down if the system starts penetrating inland
due to the presence of the high pressure ridge to the northeast and decreasing dp. It is observed that the winds at
Dome C increase to as high as 17 m s-1 with the inland penetration of the depression.

Keywords


strong wind events;cyclones;Dumont d'Urville;Antarctica

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References


DOI: https://doi.org/10.4401/ag-3411
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X