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Shear‐induced roll structure of fog observed by a millimeter‐wave scanning Doppler radar
Author(s) -
Uematsu Akihisa,
Yamamoto Masayuki K.,
Hashiguchi Hiroyuki,
Hirashima Koichi,
Fukao Shoichiro
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl022423
Subject(s) - radiosonde , geology , shear (geology) , doppler radar , radar , altitude (triangle) , meteorology , geodesy , richardson number , doppler effect , atmospheric sciences , turbulence , geometry , physics , petrology , aerospace engineering , astronomy , engineering , mathematics
Three‐dimensional fog roll structure induced by Kelvin‐Helmholtz instability (KHI) is studied, based on observations made with a millimeter‐wave scanning Doppler radar and a rawinsonde. Roll structure in a fog layer was observed below 150 m altitude when extremely large vertical shear (exceeding 100 m s −1 km −1 ) existed at 50–60 m altitude. The direction of the shear was perpendicular to the roll direction. The Richardson number was less than 0.25 at the shear altitude, which indicates that the fog roll structure was induced by KHI.