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StratosphereTroposphere Analyses of Regional Transport Experiment START08

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START08 (Pan, Elliot, Bowman) with Joint payload and flight operation with ... Trajectory model (Kenneth Bowman) WRF/MM5 (Fuqing Zhang and students) ... – PowerPoint PPT presentation

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Title: StratosphereTroposphere Analyses of Regional Transport Experiment START08


1
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
2
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

3
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.
4
Transport Boundaries and Pathways in the Ex-UTLS
5
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

6
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?)

7
NCAR CO
8
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

9
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)

10
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?

11
Extensive/frequent occurrence of the multiple
tropopause
Randel et al., 2007
12
The chemical influence of the secondary
tropopause observed during T-REX
13
Influence of the secondary tropopause Ozonesonde
profiles
BRATTS LAKE, CAN (50.2N,104.7W)
14
Microphysical implications of the secondary
tropopause?
Noel and Haeffelin, 2007
15
(No Transcript)
16
Static Stability (given in potential temperature
lapse rate d?/dz)
17
GFS d?/dz and HIRDLS Ozone April 11, 2007
18
400K
19
Trajectory calculation for the low ozone air mass
20
(No Transcript)
21
What dynamical process drives this type of event?
22
(No Transcript)
23
PV on ? 335 K (day 8)
Polvani, 2007
LC1 anticyclonic
LC2 cyclonic
24
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)

25
START08 Flight Type 3
26
Thank You !
Shadows of Monument Valley - GV Flight 051209
27
(No Transcript)
28
GFS and HIRDLS d?/dz
29
GFS d?/dz and HIRDLS Ozone. May 11, 2007
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