Saharan dust, lightning and tropical cyclones in the eastern tropical Atlantic during NAMMA-06

Gregory S. Jenkins, Aaron Pratt

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

During the summer of 2006, the downstream component of African Monsoon Multidisciplinary Analyses Campaign (NASA-AMMA (NAMMA)) examined African Easterly Waves (AEWs) emerging from the coast of Africa. Six of these disturbances went on to become named systems in the Tropical Atlantic. Two of the six systems (Tropical storm Debby and Hurricane Helene) developed in the extreme eastern Atlantic and were associated with dust outbreaks, elevated ice contents and frequent lightning. Here we show that in the early tropical cyclo-genesis stages of these systems there were thousands of cloud-to-ground (CG) lightning flashes as measured by a ground-lightning network. TRMM overpasses show high precipitation ice content above the freezing level and high latent heat release. Super-cooled water can be inferred in the lower parts of cloud systems in concert with observed high ice concentrations at high altitudes creating charge separation based on the large numbers of CG flashes.

Original languageEnglish (US)
Article numberL12804
JournalGeophysical Research Letters
Volume35
Issue number12
DOIs
StatePublished - Jun 28 2008

Fingerprint

cyclones
lightning
tropical cyclone
ice
dust
Helene
flash
tropical storms
easterly wave
hurricanes
cloud to ground lightning
monsoons
TRMM
latent heat
polarization (charge separation)
high altitude
coasts
hurricane
freezing
summer

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

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abstract = "During the summer of 2006, the downstream component of African Monsoon Multidisciplinary Analyses Campaign (NASA-AMMA (NAMMA)) examined African Easterly Waves (AEWs) emerging from the coast of Africa. Six of these disturbances went on to become named systems in the Tropical Atlantic. Two of the six systems (Tropical storm Debby and Hurricane Helene) developed in the extreme eastern Atlantic and were associated with dust outbreaks, elevated ice contents and frequent lightning. Here we show that in the early tropical cyclo-genesis stages of these systems there were thousands of cloud-to-ground (CG) lightning flashes as measured by a ground-lightning network. TRMM overpasses show high precipitation ice content above the freezing level and high latent heat release. Super-cooled water can be inferred in the lower parts of cloud systems in concert with observed high ice concentrations at high altitudes creating charge separation based on the large numbers of CG flashes.",
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Saharan dust, lightning and tropical cyclones in the eastern tropical Atlantic during NAMMA-06. / Jenkins, Gregory S.; Pratt, Aaron.

In: Geophysical Research Letters, Vol. 35, No. 12, L12804, 28.06.2008.

Research output: Contribution to journalArticle

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