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Journal Article: ID no. (ISBN etc.):  0148-0227 BibTeX citation key:  Jenkins2008b
Jenkins, G. S. & Pratt, A. S. (2008) Possible linkages between Saharan dust and tropical cyclone rain band invigoration in the eastern Atlantic during NAMMA-06. IN Geophysical Research Letters, 35. L08815.
Added by: Devic 2009-09-22 12:29:09    Last Edited by: Fanny Lefebvre 2011-01-12 17:20:27
 B  
Categories: General
Keywords: Precipitation
Creators: Jenkins, Pratt
Collection: Geophysical Research Letters
Bibliographies: Prior150410

Peer reviewed
Number of views:  802
Popularity index:  42.34%
Maturity index:  accepted

 
Abstract
The Saharan Air Layer (SAL) is a dominant feature that influences the large-scale environment from West Africa to the western tropical North Atlantic. While the SAL can create hostile thermodynamic and kinematic environmental conditions for tropical cyclogenesis, it also provides an infusion of cloud condensation and ice nuclei which can potentially invigorate convection. Here we show that these mechanisms may have been involved with the development of Tropical Storm (TS) Debby and Tropical Depression (TD) 8 (later Hurricane Helene) in 2006. Satellite imagery and rawinsondes indicate SAL outbreaks just prior to the emergence of these disturbances over the extreme Eastern tropical Atlantic Ocean. Here we examine the invigoration of convective bands associated with TS Debby and TD-8 based on satellite and direct aircraft measurement. In-situ aircraft measurements show enhanced cloud water content, cloud and precipitation sized particles, lightning and a 26 ms-1 updraft just south of the SAL with TD-8.
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Last Edited by: Fanny Lefebvre