The structure of turbulence and mixed-phase cloud microphysics in a highly supercooled altocumulus cloud

被引：13

作者：

Barrett, Paul A. ^{[1
,2
]}

Blyth, Alan ^{[2
]}

Brown, Philip R. A. ^{[1
]}

Abel, Steven J. ^{[1
]}

机构：

[1] Met Off, Fitzroy Rd, Exeter EX1 3PB, Devon, England

[2] Univ Leeds, Natl Ctr Atmospher Sci, Leeds LS2 9PH, W Yorkshire, England

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2020年 / 20卷 / 04期

基金：

英国自然环境研究理事会;

关键词：

ICE WATER-CONTENT; AIRCRAFT OBSERVATIONS; BOUNDARY-LAYER; PART I; STRATOCUMULUS; PARTICLES; PERFORMANCE; CALIBRATION; NUCLEATION; RADIATION;

D O I：

10.5194/acp-20-1921-2020

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Observations of vertically resolved turbulence and cloud microphysics in a mixed-phase altocumulus cloud are presented using in situ measurements from an instrumented aircraft. The turbulence spectrum is observed to have an increasingly negative skewness with distance below cloud top, suggesting that long-wave radiative cooling from the liquid cloud layer is an important source of turbulence kinetic energy. Turbulence measurements are presented from both the liquid cloud layer and ice virga below. Vertical profiles of both bulk and microphysical liquid and ice cloud properties indicate that ice is produced within the liquid layer cloud at a temperature of -30 degrees C. These high-resolution in situ measurements support previous remotely sensed observations from both ground-based and space-borne instruments and could be used to evaluate numerical model simulations of altocumulus clouds at spatial scales from eddy-resolving models to global numerical weather prediction models and climate simulations.

引用

页码：1921 / 1939

页数：19

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