It is known that the insects observed in the lower layers of the atmosphere produce radar echos and that their spatiotemporal distribution is strongly influenced by the meteorological conditions and the thermodynamic structure of the atmosphere. However, the available information on the subject essentially deals with the continental zones. Observations carried out from the Atlantic coast with a polarimetric Ka-band Doppler radar are used to show the existence of large band-shaped areas of insects above the coastal Atlantic Ocean, which has a reflectivity 3 × 102 times higher than the values usually observed inland. The insects collectively fly with a common heading. These bands form at dusk and are connected with the coastal atmospheric circulation, which carries along the local insect population.
Research Article| 1 April 1996
The Clear-Air Coastal Vespertine Radar Bands
Université Paul Sabatier, Observatoire Midi-Pyrénées, Laboratoire d'Aérologie, Toulouse, France
Corresponding author address: Dr. Henri Sauvageot, Université Paul Sabatier, Observatoire Midi-Pyrénées, CRA, 65300 Lannemezan, France.
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Bull. Amer. Meteor. Soc. (1996) 77 (4): 673–682.
23 October 1995
01 April 1996
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Sauvageot, H., and G. Despaux, 1996: The Clear-Air Coastal Vespertine Radar Bands. Bull. Amer. Meteor. Soc., 77, 673–682, https://doi.org/10.1175/1520-0477(1996)077<0673:TCACVR>2.0.CO;2.
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