Electrification and lightning in idealized simulations of a hurricane-like vortex subject to wind shear and sea surface temperature cooling.

Electrification and lightning in idealized simulations of a hurricane-like vortex subject to wind... AbstractRelationships between intensity fluctuations, cloud microphysics, lightning variations and electrical structure within idealized tropical cyclones are investigated with the cloud-resolving Collaborative Model for Multiscale Atmospheric Simulation (COMMAS). An initial strong tropical cyclone is subjected either to steady-state control conditions (CTRL), increased wind shear (SHEAR), or a reduction in sea surface temperature (SST).In CTRL, nearly all the lightning (>95%) occurred in the outer region (100 km < r ≤ 300 km) and was overall very episodic in the inner core (r ≤ 100 km), consistent with observations. The inner core updrafts were weaker and experienced greater depletion of cloud water by warm rain processes, which, in contrast to the deeper updrafts in the rainband convection, reduced the mixed-phase cloud depth and confined the bulk of the charging and lightning initiations to lower levels.Notably larger flash rates were produced in the asymmetric inner core of the SHEAR case, with the majority of the flashes located in the downshear left quadrant, consistent with prior observational works. In contrast to CTRL, the more vigorous inner core convection in SHEAR resulted in the formation of a prominent negative charge region and enhanced production of negative ground flashes.With a nearly identical filling rate as SHEAR, the introduction of cooler sea surface temperatures in the SST case caused lightning activity to fade rapidly in both the inner core and rainbands. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Atmospheric Sciences American Meteorological Society

Electrification and lightning in idealized simulations of a hurricane-like vortex subject to wind shear and sea surface temperature cooling.

Loading next page...
 
/lp/ams/electrification-and-lightning-in-idealized-simulations-of-a-hurricane-C8UQqhPfeu
Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0469
eISSN
1520-0469
D.O.I.
10.1175/JAS-D-16-0270.1
Publisher site
See Article on Publisher Site

Abstract

AbstractRelationships between intensity fluctuations, cloud microphysics, lightning variations and electrical structure within idealized tropical cyclones are investigated with the cloud-resolving Collaborative Model for Multiscale Atmospheric Simulation (COMMAS). An initial strong tropical cyclone is subjected either to steady-state control conditions (CTRL), increased wind shear (SHEAR), or a reduction in sea surface temperature (SST).In CTRL, nearly all the lightning (>95%) occurred in the outer region (100 km < r ≤ 300 km) and was overall very episodic in the inner core (r ≤ 100 km), consistent with observations. The inner core updrafts were weaker and experienced greater depletion of cloud water by warm rain processes, which, in contrast to the deeper updrafts in the rainband convection, reduced the mixed-phase cloud depth and confined the bulk of the charging and lightning initiations to lower levels.Notably larger flash rates were produced in the asymmetric inner core of the SHEAR case, with the majority of the flashes located in the downshear left quadrant, consistent with prior observational works. In contrast to CTRL, the more vigorous inner core convection in SHEAR resulted in the formation of a prominent negative charge region and enhanced production of negative ground flashes.With a nearly identical filling rate as SHEAR, the introduction of cooler sea surface temperatures in the SST case caused lightning activity to fade rapidly in both the inner core and rainbands.

Journal

Journal of the Atmospheric SciencesAmerican Meteorological Society

Published: Mar 27, 2017

There are no references for this article.

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 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

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