Dust Outflow and Deposition to the Ocean DODO

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Dust Outflow and Deposition to the Ocean (DODO)

• Ellie Highwood (Reading)
• e.j.highwood_at_reading.ac.uk
• Co-Is
• Hugh Coe, David Vaughan, John Lloyd, Paul
  Williams (Manchester), Roy Harrison (Birmingham)
• Collaborators
• Met Office (OBR and Hadley Centre)
• Subcontractors
• Ally Lewis (York)
• Paola Formenti (LISA-Paris)

NERC SOLAS Programme
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DODO Aims

• Case study based predictions of dust deposition
  to the NH Atlantic Ocean, constrained by in situ
  aircraft measurements
• Describe interaction of transport processes and
  aerosol chemistry and microphyiscs
• Fingerprint dust sources using single particle
  characterisation ? composition, including iron
  content
• Assess the climatological representivity of the
  case studies and predict the seasonal footprint
  of dust deposition to the north Atlantic ocean.
• Assess the radiative impact of the dust over the
  Atlantic ocean and its effect on sea surface
  temperatures.

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DODO Methodology
In-situ aircraft measurements of dust
microphysics and radiative effect, collection of
airborne samples BAe-146 Feb 06, Aug 06
DABEX (SOP-0) (Met Office experiment)
AMMA (SOP-2) International NERC/EU
Ground based sample collection on Cape Verde UoB
Dust outbreak modelling and climatology
Laboratory Analysis Iron content
Co-incident ship based observations?
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DODO fieldwork

• In situ measurements of aerosol chemical and
  microphysical properties during dust outflow
  events (case studies)
• Synergistic with, and adding value to, existing
  FAAM operations during DABEX and AMMA (by adding
  a multi-stage impactor to the LTI, thereby
  enhancing aerosol characterisation, and by adding
  flying hours)

DODO-1 Jan-Feb 2006 (extending DABEX SOP0,
TT7) FAAM aerosol microphysics and chemistry,
radiation UoB single particle composition
measurements based at Cape Verde site
(ATOFMS) Dust sample collection
DODO-2 August-September 2006 (associated with
AMMA SOP-2 TT8) FAAM chemistry and aerosol
microphysical characteristics. Dust sample
collection for iron content analysis
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DODO flights

• Total 96 hours (40 on task hours for DABEX, up to
  40 on-task and transit hours SOP2) transits
  test flights
• Limited detachment costs
• DABEX/SOP-0 DODO will extend detachment and move
  detachment to Dakar for 2 weeks after DABEX
• AMMA SOP-2 DODO will either add some hours to
  existing IOP5 (?) plans for suitcase flights to
  Dakar, some flying over ocean and then return (as
  envisaged by BAe-146 in downwind mode), or more
  likely extend by 5 or so days at end and move
  detachment to Dakar.

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DODO/AMMA

• Lots of extra flying hours and some detachment
  costs
• Extend region of BAe146 activity to ocean west of
  Dakar
• More dust and satellite intercomparison work
• Extension of ground based dust to Sal