Why did the storm ex-Gaston (2010) fail to redevelop during the PREDICT experiment?
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Authors
Freismuth, Thomas M.
Rutherford, Blake
Boothe, Mark A.
Montgomery, Michael T.
Subjects
Advisors
Date of Issue
2016
Date
Publisher
Copernicus Publications
Language
Abstract
An analysis is presented of the failed redevelopment of ex-Gaston during the 2010 PREDICT field
campaign based on the European Centre for Medium Range Weather Forecast (ECMWF) analyses. We analyze the dynamics and kinematics of ex-Gaston to investigate the role of dry, environmental air in the failed redevelopment. The flow topology defined by the calculation of particle trajectories shows that ex-Gaston’s pouch was vulnerable to dry, environmental air on all days of observations. As early as 12:00 UTC 2 September 2010, a dry layer at and above 600 hPa results in a decrease in the vertical mass flux and vertical relative vorticity. These findings support the hypothesis that entrained, dry air near 600 hPa thwarted convective updraughts and vertical mass flux, which in turn led to a reduction in vorticity and a compromised pouch at these middle levels. A compromised pouch allows further intrusion of dry air and quenching of subsequent convection, therefore hindering vorticity amplification through vortex tube stretching. This study supports recent work investigating the role of dry air in moist convection during tropical cyclogenesis.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.5194/acp-16-8511-2016
Series/Report No
Department
Meteorology
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
OPNAV N2/N6
CNMOC
National Science Foundation
NASA
Naval Postgraduate School
CNMOC
National Science Foundation
NASA
Naval Postgraduate School
Funding
AGS-1432983 (NSF)
HFIP Grant N0017315WR00048 (NOAA)
Grant NNG11PK021 (NASA)
HFIP Grant N0017315WR00048 (NOAA)
Grant NNG11PK021 (NASA)
Format
9 p.
Citation
T.M. Freismuth, B. Rutherford, M.A. Boothe, M.T. Montgomery, "Why did the storm ex-Gaston (2010) fail to redevelop during the PREDICT experiment?" Atmospheric Chemistry and Physics, v.16 (2016), pp. 8511-8519.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.