narval - halo home · 6/ 58 narval post-frontal var(x) = 0.0377, 0.0394 std(x) = 0.1943, 0.1985...
TRANSCRIPT
Christian Klepp, Stephan Bakan, Gerhard Peters, Bjorn Stevens, Lutz Hirsch, Johannes Quaas
Klima Campus
Meteorologisches Institut, Universität HamburgMax-Planck-Institut für Meteorologie, Hamburg
NARVALNorth Atlantic Rainfall Validation
NARVAL Partner
University of HamburgUniversity of CologneUniversity of LeipzigUniversity of MainzUniversity of FrankfurtUniversity of Heidelberg
Institute for Tropospheric Research, Leipzig
Max Planck Institute for Meteorology, HamburgMax Planck Institute for Chemistry, Mainz
DLR
no DFG funding yet
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Ober-pfaffenhofen
NARVAL- Postfrontal
NARVAL- Trade
New Foundland
Barbados
Concept
cum
ulus
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NARVAL Post-frontal
mm/h
HOAPS
mm/h
GPCP GPROF 6.0
mm/h
ECMWF
Hamburg Ocean-Atmosphere Parameters and Fluxes from Satellite data (SSM/I)
Global Precipitation Climatology Project
ECMWF numerical weather prediction model
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NARVAL Post-frontal
REMO 137 Cases (24%)
Jan1988 to Dec 2001
GPROF6.0
Fre
quen
y oc
curr
ence
758 mesocyclone systems in HOAPS in 18 years
HOAPS 555 Cases REMO-C 296 Cases (53%)
ERA-40ERA-40 41 Cases ( 7%)(from 1994 to 1999 only)
Mesoscale system frequeny occurrence per month (twice daily) with precip > 1mm/h in the outflow region of the LabSea
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NARVAL Post-frontal
VAR(x) = 0.0377, 0.0394STD(x) = 0.1943, 0.1985VAR(y) = 0.0046, 0.0213STD(y) = 0.0680, 0.1677RMSE = 0.19 ,0.36BIAS = 0.18 ,0.32r = 0.25, -0.46
Virga observed
r = 0.6
Disdrometer: temporal window± 45 min around individual SSM/I overpass
HOAPS: spatial window 110km centered around ship position
rincl_corr_neg=0.57rincl_corr_neg > 6min =0.94
Klepp et al., 2009 (in review)
Collocated ship to HOAPS satellite F13, F14, F15 data for 52 precip events Point-to-area validation for events shorter, longer 6 min duration
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NARVAL Post-frontal
• Convective mesoscale postfrontal precipitation
• Deficit of existing satellite and NWP data to detect such systems
• Systems can lead to unpredicted high impact weather over Europe
• HOAPS – the Hamburg Ocean Atmosphere Parameters and fluxes from Satellite data climatology detects such systems
• in agreement with data from Voluntary Observing Ships
• These findings need to be validated in terms of quantitative amounts
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NARVAL Trade cumulus
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Unobstructed Trades
Mineral Ash Maximum
Deep Convection
Biomass BurningStatistics of Shallow Convection
NARVAL Trade cumulus
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NARVAL Trade cumulus
ACPC Barbados Field Study
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NARVAL Trade cumulus
The MPI-M (MIRA 36) Scanning Cloud Radar
Differential absorption lidar Five-channel Raman lidar
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Additional MPI-M and U Cologne Instrumentation
• JENOPTIK CHM 15K Ceilometer. Measurement range to 0.03-15 km with 15 m resolution, multiple cloud layer detection, aerosol, cloud penetration depths and boundary layer height.
• Micro Rain Radar (MRR): Compact 24 GHz FMCW-radar, 10 - 200 m resolution. Drop size distributions, liquid water & drop fall speed characteristics.
• CCN Measurements?
• Microwave radiometer
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HALO
Connecting Ground-Based Measurements to the large-scale structure of the lower troposphere, and ongoing satellite based remote sensing climatologies.
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HALO Instrumentation
• HALO HAMP (Hamburg/DLR Microwave Package).
• DLR water-vapor DIAL and/or wind lidar.
• Dropsondes.
• Downward looking infrared and visible imagers.
• Fast 10 Hz state variables (U,V, W, T & Q).
• Liquid water measurements.
• Cloud Spectrometers.
• Aerosol/CCN Characterization.
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HALO Deployment strategy
• 2-4 day missions: day 1 depart Oberpfaffenhofen; day 2 or 3 short flight over Barbados (optional); day 4 return to Oberpfaffenhofen.
• High-Altitude, remote-sensing ferry legs along trajectory of airmass advecting over Barbados.
• Dropsondes deployed along trajectories (ferry legs).
• Interception of Barbados-bound airmass along ferry, ideally coincident with overpass of polar orbiters. This interception should be 3-5 days upstream of target on outbound legs, 1-2 days upstream on return legs.
• In situ characterization (as endurance allows) of the lower troposphere, boundary layer, cloud, aerosol structure (and surface fluxes) at interception points, and in radar scanning volume upon landing/take-off at Barbados.
• Super-site overflights out- or inbound (Lindenberg, Cabauw, Chilbolton, ...)
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Ober-pfaffenhofen
NARVAL- Postfrontal
NARVAL- Trade
New Foundland
Barbados
Concept
cum
ulus
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Full science and “light” options
• “light”: only HAMP and dropsondes, potentially filling idle times
• optimum flight schedule:December-January-February for Northern routeMarch-April for Southern route
• if possible, better statistics by repeated flights
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• Kick-off meeting 11-12 November in Hamburg(please contact Lutz Hirsch <[email protected]>)
• Bellypod ahead of windpods and PMS in certification
• HAMP ground-based version (mobile on trailer) exists
• Certification relatively advanced (expected spring 2010)
Status