StratosphereTroposphere Analyses of Regional Transport Experiment START08

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Stratosphere-Troposphere Analyses of Regional
Transport Experiment (START08)

• Tropospheric Intrusion associated with the
  secondary tropopause from HIRDLS data

Laura Pan
With contributions from Bill Hall, Paul Konopka,
and HIRDLS team
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Brief Overview of START08

• NCAR UTLS initiative - Integrated studies of
  coupled dynamics, chemistry, microphysics and
  radiation in the UTLS region (formed since 2003)
• START - transport studies using tracers and
  tracer correlations
• The concept of START was tested with limited
  payload during the test flight of HIAPER in Dec
  2005 (START05). Pan et al., 2007 Bowman et al.,
  2007 Young et al., 2007
• START08 (Pan, Elliot, Bowman) with Joint payload
  and flight operation with PreHIPPO project (Steve
  Wofsy), will be conducted April-May, and June
  16-28, 2008
• 150 flight hours, Broomfield Colorado based
• Collaborating satellite data and modeling
  activities

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Primary Objectives of START08

• Investigate key transport processes that impact
  the chemical-microphysical distribution of the
  Ex-UTLS
• Characterize the transport boundaries and
  transport pathways in the Ex-UTLS using
  tracer-tracer correlations

Secondary Objectives
Assist in the development and testing of the
HIAPER aircraft payload and flight capabilities.
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Transport Boundaries and Pathways in the Ex-UTLS
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Scientific Issues

• Transport Boundaries in the Ex-UTLS (i.e., the
  tropopause)
• is the Is the extratropical tropopause better
  characterized as a surface or a layer? ExTL?
• If a layer, how do we identify/define it? What
  controls its existence/depth?
• STE and Transport pathways in the Ex-UTLS
• How do we characterize or quantify STE?
• Is flux the right number to go after? (not an
  observable)
• What are the right observables to quantify?
• The Behavior of the Secondary Tropopause
• Role of Convective Transport
• Role of gravity waves (GW) in the structure and
  composition of Ex-UTLS

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START08 Strategy

• Right questions first, then right answers
• Target key processes and identify key observables
  (dynamical variability, tracer correlations, age
  spectrum)
• Use physical evidence to identify the transport
  boundary
• Relate dynamical variables to chemical
  compositions (for example, what is PV-ozone
  correlation in the tropopause region? How is it
  vary with space (lat/isentropes) and time
  (seasons) ? The role of other dynamical
  variables?)

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NCAR CO
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START08 measurements II GV Sampling Strategy

• Six flight scenarios in planning
• Extratropical Tropopause and transition layer
  (ExTP/ExTL) Survey
• Stratospheric intrusion (tropopause fold)
• Tropospheric intrusion (poleward into lower
  stratosphere)
• Convective transport
• Gravity wave
• Cirrus layer (single or multiple) near the
  tropopause

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Satellite Data and Modeling

• Satellite data
• Participations NRT HIRDLS (team), MLS (Olsen),
  AIRS/IASI (NOAA group), OMI (TBD), CALIPSO (TBD)
• Models involved
• WACCM (Doug Kinnison, Simone Tilmes, Andrew
  Gettelman)
• CLaMs (Paul Konopka, Bill Hall)
• Idealized GCM (Lorenzo Polvani)
• Trajectory model (Kenneth Bowman)
• WRF/MM5 (Fuqing Zhang and students)
• Possible involvement of cloud resolving models
  (Ken Pickering and Pao Wang)

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Scientific Questions III The Behavior of the
Secondary Tropopause

• Does the secondary tropopause derived from the
  WMO definition have physical meaning?
• Are there chemical transport processes associated
  with the secondary tropopause?
• What are the microphysical behavior of the region
  of multiple tropopauses?
• What dynamical processes control or contribute to
  the occurrence of the secondary tropopause?

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Extensive/frequent occurrence of the multiple
tropopause
Randel et al., 2007
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The chemical influence of the secondary
tropopause observed during T-REX
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Influence of the secondary tropopause Ozonesonde
profiles
BRATTS LAKE, CAN (50.2N,104.7W)
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Microphysical implications of the secondary
tropopause?
Noel and Haeffelin, 2007
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(No Transcript)
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Static Stability (given in potential temperature
lapse rate d?/dz)
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GFS d?/dz and HIRDLS Ozone April 11, 2007
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400K
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Trajectory calculation for the low ozone air mass
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(No Transcript)
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What dynamical process drives this type of event?
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PV on ? 335 K (day 8)
Polvani, 2007
LC1 anticyclonic
LC2 cyclonic
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How do we quantify the chemical impact of the
process?

• Measurements of tracers of wide range of
  lifetimes in the layer is planned during START08
• Statistical analyses of HIRDLS ozone cross
  section is planned - contrast of zonal means of
  two types of cross sections
• Trajectory and mixing modeling using CLAMS is in
  progress
• Post START08 comparison and model analyses with
  WACCM (offline)

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START08 Flight Type 3
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Thank You !
Shadows of Monument Valley - GV Flight 051209
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(No Transcript)
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GFS and HIRDLS d?/dz
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GFS d?/dz and HIRDLS Ozone. May 11, 2007