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Title: Drizzle and Turbulence below closed cellular marine stratocumulus clouds

Abstract

Drizzle is ubiquitous in marine boundary layer stratocumulus clouds with much of it evaporating before reaching the surface. Ten days of observations made at the Atmospheric Radiation Measurement (ARM)’s Eastern North Atlantic (ENA) site during closed cellular stratocumulus cloud conditions are used to characterize drizzle below the cloud base and its impact on the boundary layer turbulence. Cloud and drizzle micro- and macro-physical properties were retrieved by combining the data from vertically pointing Doppler cloud radar, ceilometer, and microwave radiometer. On average the drizzle shafts were 28.14 km wide, with cloud base rain rate and modal diameter of 1.26 mm day-1 and 145.26 µm respectively. The rain rate at the surface was negligible yielding an average diabatic cooling of -30.60 Wm-2 in the sub-cloud layer. The LWP and turbulence within the boundary layer increased with an increase in the cloud top radiative cooling, however none of these variables exhibited any relationship with cloud base rain rate. For a similar amount of radiative cooling at the cloud top, the average variance of vertical velocity in the sub-cloud layer was about 10% lower during strongly precipitating conditions as compared to lightly precipitating conditions. The reduction in the variance of vertical velocity duemore » to drizzle evaporation was primarily confined to the upper half of the sub-cloud layer and was due reduction in the strengths of the downdrafts. Collectively our results show substantial impact of drizzle evaporation on boundary layer turbulence, necessitating its accurate representation in the Earth System Models.« less

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Biological and Environmental Research - Atmospheric System Research; National Science Foundation (NSF)
OSTI Identifier:
1570438
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Geophysical Research: Atmospheres (Online)
Additional Journal Information:
Journal Volume: 124; Journal Issue: 11
Country of Publication:
United States
Language:
English
Subject:
drizzle; stratocumulus; turbulence

Citation Formats

Ghate, Virendra, and Cadeddu, Maria P. Drizzle and Turbulence below closed cellular marine stratocumulus clouds. United States: N. p., 2019. Web. doi:10.1029/2018JD030141.
Ghate, Virendra, & Cadeddu, Maria P. Drizzle and Turbulence below closed cellular marine stratocumulus clouds. United States. doi:10.1029/2018JD030141.
Ghate, Virendra, and Cadeddu, Maria P. Sun . "Drizzle and Turbulence below closed cellular marine stratocumulus clouds". United States. doi:10.1029/2018JD030141.
@article{osti_1570438,
title = {Drizzle and Turbulence below closed cellular marine stratocumulus clouds},
author = {Ghate, Virendra and Cadeddu, Maria P.},
abstractNote = {Drizzle is ubiquitous in marine boundary layer stratocumulus clouds with much of it evaporating before reaching the surface. Ten days of observations made at the Atmospheric Radiation Measurement (ARM)’s Eastern North Atlantic (ENA) site during closed cellular stratocumulus cloud conditions are used to characterize drizzle below the cloud base and its impact on the boundary layer turbulence. Cloud and drizzle micro- and macro-physical properties were retrieved by combining the data from vertically pointing Doppler cloud radar, ceilometer, and microwave radiometer. On average the drizzle shafts were 28.14 km wide, with cloud base rain rate and modal diameter of 1.26 mm day-1 and 145.26 µm respectively. The rain rate at the surface was negligible yielding an average diabatic cooling of -30.60 Wm-2 in the sub-cloud layer. The LWP and turbulence within the boundary layer increased with an increase in the cloud top radiative cooling, however none of these variables exhibited any relationship with cloud base rain rate. For a similar amount of radiative cooling at the cloud top, the average variance of vertical velocity in the sub-cloud layer was about 10% lower during strongly precipitating conditions as compared to lightly precipitating conditions. The reduction in the variance of vertical velocity due to drizzle evaporation was primarily confined to the upper half of the sub-cloud layer and was due reduction in the strengths of the downdrafts. Collectively our results show substantial impact of drizzle evaporation on boundary layer turbulence, necessitating its accurate representation in the Earth System Models.},
doi = {10.1029/2018JD030141},
journal = {Journal of Geophysical Research: Atmospheres (Online)},
number = 11,
volume = 124,
place = {United States},
year = {2019},
month = {6}
}

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