Dynamics of cloud-top generating cells in winter cyclones. Part III: Shear and convective organization

Dynamics of cloud-top generating cells in winter cyclones. Part III: Shear and convective... AbstractCloud-top generating cells (GCs) are a common feature atop stratiform clouds within the comma-head of winter cyclones. The dynamics of cloud-top GCs are investigated using very-high-resolution idealized WRF model simulations to examine the role of shear in modulating the structure and intensity of GCs. Simulations were run for the same combinations of radiative forcing and instability as in Part II, but with 6 different shear profiles ranging from 0-10 m s-1 km-1 within the layer encompassing the GCs.The primary role of shear was to modulate the organization of GCs, which organized as closed convective cells in simulations with radiative forcing and no shear. In simulations with shear and radiative forcing, GCs organized in linear streets parallel to the wind. No GCs developed in the initially stable simulations with no radiative forcing. In the initially unstable and neutral simulations with no radiative forcing or shear, GCs were exceptionally weak, with no clear organization. In moderate shear ( = 2, 4 m s-1 km-1) simulations with no radiative forcing, linear organization of the weak cells was apparent, but this organization was less coherent in simulations with high shear ( = 6, 8, 10 m s-1 km-1). The intensity of the updrafts was primarily related to the mode of radiative forcing, but was modulated by shear. The more intense GCs in nighttime simulations were either associated with no shear (closed convective cells) or strong shear (linear streets). Updrafts within GCs under conditions with radiative forcing were typically ~1-2 m s-1 with maximum values less than 4 m s-1. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Atmospheric Sciences American Meteorological Society

Dynamics of cloud-top generating cells in winter cyclones. Part III: Shear and convective organization

Loading next page...
 
/lp/ams/dynamics-of-cloud-top-generating-cells-in-winter-cyclones-part-iii-fXjjDaLiWv
Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0469
D.O.I.
10.1175/JAS-D-16-0314.1
Publisher site
See Article on Publisher Site

Abstract

AbstractCloud-top generating cells (GCs) are a common feature atop stratiform clouds within the comma-head of winter cyclones. The dynamics of cloud-top GCs are investigated using very-high-resolution idealized WRF model simulations to examine the role of shear in modulating the structure and intensity of GCs. Simulations were run for the same combinations of radiative forcing and instability as in Part II, but with 6 different shear profiles ranging from 0-10 m s-1 km-1 within the layer encompassing the GCs.The primary role of shear was to modulate the organization of GCs, which organized as closed convective cells in simulations with radiative forcing and no shear. In simulations with shear and radiative forcing, GCs organized in linear streets parallel to the wind. No GCs developed in the initially stable simulations with no radiative forcing. In the initially unstable and neutral simulations with no radiative forcing or shear, GCs were exceptionally weak, with no clear organization. In moderate shear ( = 2, 4 m s-1 km-1) simulations with no radiative forcing, linear organization of the weak cells was apparent, but this organization was less coherent in simulations with high shear ( = 6, 8, 10 m s-1 km-1). The intensity of the updrafts was primarily related to the mode of radiative forcing, but was modulated by shear. The more intense GCs in nighttime simulations were either associated with no shear (closed convective cells) or strong shear (linear streets). Updrafts within GCs under conditions with radiative forcing were typically ~1-2 m s-1 with maximum values less than 4 m s-1.

Journal

Journal of the Atmospheric SciencesAmerican Meteorological Society

Published: Jun 23, 2017

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from
Google Scholar,
PubMed
Create lists to
organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off