TT9 : AMMA downstream AugSep 2006, Dakar Senegal

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TT9 AMMA  downstream Aug-Sep 2006, Dakar
(Senegal)

• Key weather systems in the West African and
  Tropical Atlantic regions.
• Solid line represents a streamline at the level
  of the AEJ around 600hPa, its undulation
  represents an AEW.
• Grey shading represents peak rainfall associated
  with MCSs and
• yellow shading indicates the location of the SAL.

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(No Transcript)
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CHANGING OCEANIC CONDITIONS
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Tropical cyclogenesis frequency
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TT9 goals

• To investigate the synoptic environment (monsoon
  flow, AEJ, Saharan Air Layer , easterly waves,
  upper troposphere, ) and the dynamic,
  thermodynamic and microphysical characteristics
  of West African MCSs arriving over the warm
  waters of the eastern tropical Atlantic ocean
• To compare with the observed characteristics of
  continental MCSs near Niamey during AMMA SOP-B
  (July), C (August) and D (1-15 Sep)
• To contribute to the understanding of the key
  processes, at the synoptic and meso- scle,
  involved in tropical cyclogenesis

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TT9 Projects

• Senegal LPAO DMN (Dakar C-band and Linquere
  S-band radars raingauges ) (operational)
• AMMA-SOP radiosounding network (planned)
• ZEUS long-range lightning detection network
  (operational)
• USA  AMMA-Senegal  (decision pending )
• France  SOP-E  (decision pending )
• USA  NOAA Annual Hurricane Program 2006 
  (allocated research flight hours dropsondes)
• USA - France  driftsondes  (status unknown ?)
• USA  ASHE  (status unknown ?)

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SENEGAL

• Direction de la Météorologie Nationale du
  Sénégal, C. Diop
• Laboratoire de Physique de lAtmosphère et
  dOcéanographie ( Ecole Supérieure
  Polytechnique / Université Cheikh Anta Diop de
  Dakar ), A Gaye

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AMMA-SOP radiosounding network
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US  AMMA-Senegal  15 AUG 15 (30?) SEP
2006(Howard Univ, Univ of Virginia, Univ of N
Dakota, Colorado State Univ, NCAR) PI G Jenkins

• Precipitation processes and characteristics
  NASA N-Pol S-Band polarimetric Doppler radar,
  raingauges, disdrometers 50 km SW from Dakar
• disdrometer in Sal (Cape Verde)

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US  AMMA-Senegal  15 AUG 15 (30?) SEP 2006

• Cloud microphysics University of North Dakota
  Citation II aircraft
• - Spaceborne, airborne ground-based
  measurements
• Differences between continental and oceanic MCSs
• Relations between ice, SAL, lightning and
  precipitation efficiency

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• Aerosol surface radiative forcing NASA
  Micropulse Lidar in Mbour (AERONET photometer)
  Sal ?

• Real-time modeling WRF forecasts from GFS-00Z
  for 24-48 h in Howard Univ and in LPAO (Dakar)

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SOP-E (CNRS-CNES) 15 30 SEP 2006 PIs D.
Bouniol F. Roux
Falcon-20 with RALI (cloud Radar - Lidar
combination), in-situ mf probes (FSSP/2D-C/2D-P)
and dropsondes.
As SOP-D in coordination with ground-based
Doppler polarimetric radar measurements horizon
tal structure of MCS stratiform and cirriforme
anvil at 40 kft vertical structure of MCS anvil
stratiform and cirriforme anvil at 20, 30 40
kft.
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SOP-E (CNRS-CNES)PIs D. Bouniol F. Roux
Falcon-20 with RALI (cloud Radar - Lidar
combination), in-situ mf probes (FSSP/2D-C/2D-P)
and dropsondes.
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 NOAA Annual Hurricane Field Program  PIs J
Dunion, S. Aberson
Example of 8-h dropwindsonde sampling
mission dedicated to a developing tropical
disturbance with the NOAA G-IV based in Barbados
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Driftsondes (NCAR-CNES)PI D Parsons
The driftsonde flights, from NDjamena / Chad,
will provide synoptic-scale high-vertical-resoluti
on atmospheric profiles made by the GPS
dropsondes. The balloon flies at an altitude of
16 kilometers. The gondola can carry up to 20 of
the current GPS aircraft dropsondes that can be
dropped at predetermined times by computer or on
command through a satellite link.
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 AMMA Seedling Hurricane Experiment
ASHE (Aerosonde, NOAA, NCAR, Georgia Tech)PI
G Holland

• Aerosondes
• - Observations in the lower atmosphere close
  to the ocean surface
• Meso- and larger scale observations of the
  environment in which seedling hurricane develop

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 AMMA downstream  logistics

• FR/FA-20 US/Citation aircraft will be based in
  Dakar-Yoff international airport
• N-Pol about 50 km SE of Dakar
• Aerosondes launch site and control center ?
• Forecast requirements ( 24h advice for A/C )
• METEOSAT images ? MCSs propagation
• WRF forecasts in LPAO Howard Univ, NCEP
  TC-genesis products
• Communication with NOAA HFP for G-IV operations