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clear air turbulence
Definição1
A higher altitude (6–15 km) turbulence phenomenon occurring in cloud-free regions, associated with wind shear, particularly between the core of a jet stream and the surrounding air.
Fonte1
AMERICAN METEOROLOGICAL SOCIETY. Glossary of meteorology. [S.l., última modificação 05 oct. 2015]. Disponível em: < http://glossary.ametsoc.org/wiki/Main_Page >. Acesso em: 27 jul. 2022.
Definição2
Atmospheric turbulence on scale sufficient to cause bumpiness with respect to an aircraft in flight. Such turbulence is neither associated with clouds nor directly ascribable to the frictional influence of the ground or to convection currents.
Fonte2
COMPLETE multilingual dictionary of aviation and aeronautical terminology: english, french, spanish. Chicago: Passport Books, c1984. 671 p.
Fonte3
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aeronautical meteorological practice. 10.ed. Montreal, 2015. (Doc. 8896)
Fonte4
AMERICAN METEOROLOGICAL SOCIETY. Glossary of meteorology. [S.l., última modificação 05 oct. 2015]. Disponível em: < http://glossary.ametsoc.org/wiki/Main_Page >. Acesso em: 27 jul. 2022.
Nota Adicional1
It is most common near upper air fronts and the tropopause, and can often affect an aircraft without warning. Clear-air turbulence also frequently occurs close to towering cumulus clouds (usually within 30 km), and near mountains. Airflow disrupted by mountains and other terrain can undulate in waves of turbulence for 1000 km or more.
Nota Adicional2
Acronym in English: CAT.
Contexto
The layers regarding icing and in-cloud turbulence forecasts have a depth of 100 hPa and the layers regarding clear air turbulence have a depth of 50 hPa.
Subárea
Aeronautical Meteorology
Français
turbulence en air clair