Analysis of aerological data and cloud observations at Syowa Station, East Antarctica in 1979

概要

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To analyze the records of upper air observations carried out at Syowa Station in East Antarctica in 1979,characteristic features of Antarctic clouds were surveyed. As a result, vertical structures of clouds were classified into four types. Clouds of type I are defined as clouds which are formed in a nearly moist adiabatic vertical temperature profile. Clouds of type II are defined as clouds which are formed when the temperature profile is isothermal in the lower layer. Clouds of type III are defined as clouds which form in a strong surface inversion layer. Clouds type IV are defined as clouds which form in an inversion layer at middle level. This paper describes the relationship between these clouds and the synoptic fields in July 1979 as an example of a winter season. Type I clouds are connected with synoptic scale disturbances, type II are connected with subsidence inversions, type III are connected with inversions formed from surface cooling, and type IV often occured before or after a disturbance passed through Syowa Station.