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Reference TypeElectronic Source
Holder Codeisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Last Update2007: administrator
Metadata Last Update2021: administrator
Citation KeyKouadioMachServ::TrAtCy
TitleTropical Atlantic Cyclogenesis Coming from West African Mesoscale Convective Systems
Last Update Date2007-12-15
Access Date2021, Apr. 23
Type of MediumOn-line
Number of Files1
Size4084 KiB
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Author1 Kouadio, Yves K.
2 Machado, Luiz Augusto Toledo
3 Servain, Jacques
Resume Identifier1
Affiliation1 University of Cocody, Abidjan, UFR-SSMT, Laboratory of Atmospheric Physics, 22 BP 582 Abidjan 22,Côted’Ivoire. Visiting Scientist at Divisão Satélite e Sistemas Ambiantes (CPTEC/INPE)
2 Instituto Nacional de Pesquisas Espaciais (INPE/CPTEC)
3 Institut de Recherche pour le Développement (IRD-UR182), Visiting Scientist at Fundação Cearense de Meteorologia e Recursos Hídricos (FUNCEME)
Alternate PublicationMonthly Weather Review
ProducerInstituto Nacional de Pesquisas Espaciais
CitySão José dos Campos
Secondary TypePRE PI
Stage of Alternate Publicationsubmitted
ProgressePrint update
History2007-12-14 11:44:14 :: -> administrator ::
2021-02-10 23:13:35 :: administrator -> ::
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Is the master or a copy?is the master
Content Stagework-in-progress
Keywordshurricanes, mesoscale convective systems, tropical Atlantic, SST dipole.
AbstractWe investigate the possibility that hurricanes (H) spreading into the tropical Atlantic are originally connected with mesoscale convective systems (MCSs) previously generated on the West African continent. The analysis is carried out over 2004 and 2005, during which we find ten cases (six in 2004, four in 2005, all during July-August-September) for which such a connection can be made. For each one of the selected cases a backward methodology is performed using both subjective and objective analyses. This methodology is summarized as follows: starting from the date and position of the studied H when it is primarily catalogued as a tropical depression, we look backward at a possible easterly wave which may be the physical bond between the H initiation and an MCS dissipation in the ocean off the African coast. In this subjective step we use the wave signature from the 700 hPa vorticity at a 6-hour frequency given by the reanalysis of the NCEP, as well as the MCS dataset provided by the MSG-7 images. Having associated the easterly wave with a sufficiently consequential MCS in terms of intensity and lifespan, we proceed, in a second step, to an objective backward analysis to go up to the time until the origin (date and position) of this MCS. In this second step we adapt a recent tracking methodology (FORTRACC) to individually track each MCS at a 30-minute frequency by using a dynamical threshold temperature. We find that practically all the selected cases (9 out of 10) originate from a roughly limited area over West Africa. Mostly of MCS-H cases studied, shown an increase in the relative vorticity after MCS dissipation. As another important result, such connection between these MCSs which originate in West Africa and the occurrences of hurricanes takes place when a dipole in the sea surface temperature (SST) anomaly is observed between the Main Development Region (MDR) of the hurricanes (positive SST anomaly), and the equatorial tongue in the Gulf of Guinea (negative SST anomaly). .
ArrangementTropical Atlantic Cyclogenesis...
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