Electrically Active Hot Towers in African Easterly Waves prior to Tropical CyclogenesisSource: Monthly Weather Review:;2009:;volume( 138 ):;issue: 003::page 663DOI: 10.1175/2009MWR3048.1Publisher: American Meteorological Society
Abstract: It has been hypothesized that intense convective-scale ?hot? towers play a role in tropical cyclogenesis via dynamic and thermodynamic feedbacks on the larger-scale circulation. In this study the authors investigate the role that widespread and/or intense lightning-producing convection (i.e., electrically hot towers) present in African easterly waves (AEWs) may play in tropical cyclogenesis over the east Atlantic Ocean. The 700-hPa meridional wind from the NCEP?NCAR reanalysis dataset was analyzed to divide the waves into northerly, southerly, trough, and ridge phases. The AEWs were subsequently divided into waves that developed into tropical storms (i.e., developing) and those that did not develop into tropical storms (i.e., nondeveloping). Finally, composites were created using various NCEP variables, lightning data gathered with the Zeus network and worldwide lightning location network (WWLLN), and brightness temperature data extracted from the NASA global-merged infrared brightness temperature dataset. Results indicate that in all regions examined the developing waves seem to be associated with more widespread and/or intense lightning-producing convection. This increased convection associated with the developing waves might be related to the increased midlevel moisture, low-level vorticity, low-level convergence, upper-level divergence, and increased upward vertical motion found to be associated with the developing waves. In addition, the phasing of the convection with the AEWs as they move from East Africa to the central Atlantic shows some variability, which may have implications for tropical cyclogenesis.
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contributor author | Leppert, Kenneth D. | |
contributor author | Petersen, Walter A. | |
date accessioned | 2017-06-09T16:32:22Z | |
date available | 2017-06-09T16:32:22Z | |
date copyright | 2010/03/01 | |
date issued | 2009 | |
identifier issn | 0027-0644 | |
identifier other | ams-69632.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4211323 | |
description abstract | It has been hypothesized that intense convective-scale ?hot? towers play a role in tropical cyclogenesis via dynamic and thermodynamic feedbacks on the larger-scale circulation. In this study the authors investigate the role that widespread and/or intense lightning-producing convection (i.e., electrically hot towers) present in African easterly waves (AEWs) may play in tropical cyclogenesis over the east Atlantic Ocean. The 700-hPa meridional wind from the NCEP?NCAR reanalysis dataset was analyzed to divide the waves into northerly, southerly, trough, and ridge phases. The AEWs were subsequently divided into waves that developed into tropical storms (i.e., developing) and those that did not develop into tropical storms (i.e., nondeveloping). Finally, composites were created using various NCEP variables, lightning data gathered with the Zeus network and worldwide lightning location network (WWLLN), and brightness temperature data extracted from the NASA global-merged infrared brightness temperature dataset. Results indicate that in all regions examined the developing waves seem to be associated with more widespread and/or intense lightning-producing convection. This increased convection associated with the developing waves might be related to the increased midlevel moisture, low-level vorticity, low-level convergence, upper-level divergence, and increased upward vertical motion found to be associated with the developing waves. In addition, the phasing of the convection with the AEWs as they move from East Africa to the central Atlantic shows some variability, which may have implications for tropical cyclogenesis. | |
publisher | American Meteorological Society | |
title | Electrically Active Hot Towers in African Easterly Waves prior to Tropical Cyclogenesis | |
type | Journal Paper | |
journal volume | 138 | |
journal issue | 3 | |
journal title | Monthly Weather Review | |
identifier doi | 10.1175/2009MWR3048.1 | |
journal fristpage | 663 | |
journal lastpage | 687 | |
tree | Monthly Weather Review:;2009:;volume( 138 ):;issue: 003 | |
contenttype | Fulltext |