Vision for ground aerosol networks: AERONET and MPLNET

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Vision for ground aerosol networks AERONET and
MPLNET

• Operational Status
• Science Results
• Future Plans
• Issues
• ??

Brent Holben and Judd Welton
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AERONET Status

• Provide a long term data set to
• Characterize aerosol optical properties
• Validate Satellite model aerosol retrievals
• Synergism with Satellite obs., climate change

• 280 instruments
• 150-180 Operational sites
• Network Partners
• GSFC
• Photons (France)
• RIMA (Spain)
• CSIRO (Australia)
• AEROCAN (Canada)
• Expansion to Asia, Africa high latitudes and over
  water sites

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AERONET Version 2 AOD

• Version 2 (AOD) implemented July 2005
• Improved corrections Satellite
• TOMS (Monthly gridded O3)
• SCIAMACY (Monthly gridded NO2)
• Improved corrections NCEP/NCAR Reanalysis
• Dynamic Air Pressure for Rayleigh, CO2 and CH4
  correction
• Much improved and QA water vapor retrievals
• Details http//AERONET.gsfc.nasa.gov/version2-ta
  ble.pdf

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AERONET Inversion 2

• Unified Inversion products from combined
  Sphere/Spheroid models
• Uncertainty Assessment w/ all products
• Dynamic surface reflectances
• MODIS IGBP Ecosystem reflectance (16 day
  product) generic BRDF
• Cox-Munk for ocean sites (hybrid for coastal
  sites)
• Snow and Ice from NISE product (daily)
• Inversion Products for PP retrievals
• Forcing computations

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AERONET Science

• Aerosol Characterization
• Algorithm Development
• AOD
• Retrievals
• Validation
• Synergism
• Blue Sky
• Cockamamy

• Significant Enabling
• AERONET Paper- 493
• citations since 1998,
• 134 citations in 2005
• Staff citations of key
• AERONET papers since
• 2000 751

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AERONET-OC(Ocean Color)

• SeaPRISM (cimel)
• Normalized water leaving radiances (Lwn)
• 3 yr validation w/ in water optics (Venice)
• Standard AOT and inversion products
• ?(nm) 412, 443, 490, 531, 551, 677, 870, 940,
  1020

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AERONET-MSP(multispectral polarization)

• Spectral linear Polarization hourly
• Standard Products
• L(nm) 340, 380, 440, 500, 675, 870, 940, 1020,
  1640
• AERONET testing (Feb. to May 2006)
• Operational products June 2006

Dual filter wheel, top for polarizers bottom for
IAD filters
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AERONET support for Field Campaigns

• East AIRE-east China
• Base Asia-Thailand
• Milagro-Mexico
• AMMA-W. Africa
• ABC-damn near everywhere
• ARM sites
• RAJO-MEGHA Indo-Gangenic Plain (2007)
• Seven Seas-S. Asia and SE Asia (2007?)

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AERONET Directions

• Collaboration and co-location w/ BSRN and MPLNET
  (extinction profile product)
• Development of SolRad-Net (http//solrad-net.gsfc.
  nasa.gov)
• Cloud Optical depth retrievals
• 2008-new Sun-Sky system to be phased in
• 2008-CO2 network (3ppm accuracy anticipated)
• BAMGOMAS browser Links to MODIS, MPLNET,
  Gocart, backtrajectories for all AERONET sites

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Overview and Current Status
Objective Acquire long-term observations of the
vertical structure of aerosols and clouds using
common instrumentation and data processing in a
federated network. Focus on co-location with
select AERONET sites.

• Currently
• 11 active sites
• 7 planned sites (in preparation)
• 4 proposed sites (funding dependent)
• 10 sites no longer active (mostly field
  campaigns)
• 1 Ocean cruise (two cruises pre-dating MPLNET
  are available)
• Most campaigns utilize SMART-COMMIT platform
  (Tsay et al. 613.2)

Goddard team 11 Partners compose MPLNET NASA
LaRC NOAA ESRL Naval Research Lab -
Monterey Japans National Institute of Polar
Research Spains Instituto Nacional de Técnica
Aeroespacial - INTA 3 US Universities 2 Korean
Universities 1 Taiwan University
other partners pending
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Recent Publication/Science Results
How well do state-of-the-art techniques measuring
the vertical profile of tropospheric aerosol
extinction compare? B. Schmid, R. Ferrare, C.
Flynn, R. Elleman, D. Covert, A. Strawa, E.
Welton, D. Turner, H. Jonsson, J. Redemann, J.
Eilers, K. Ricci, A. G. Hallar, M. Clayton, J.
Michalsky, A. Smirnov, B. Holben, and J. Barnard,
J. Geophys. Res., 111, D05S07, doi10.1029/2005JD0
05837, 2006.

• Aerosol Extinction Optical Depth profiles
  compared in most comprehensive study to date
• MPLNET (column AOT anchored to AERONET)
• MPL from ARM
• Airborne Ames Sunphotometer (AATS)
• Airborne nephelometer absorption photometer
• Airborne cavity ring-down system (Cadenza)
• Ground-based Raman lidar (CARL)

• AATS used as truth
• AATS is most direct measure of AOT profile
• AATS Column AOT within 2 of AERONET

AATS-14 shown above
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Future Plans, Network Growth, News
African Monsoon Multidisciplinary Analysis
Our future long term site in Senegal will also
support the AMMA campaign, but is not dependent
upon NAMMA funding (US). Our NASA MOU with Ecole
Supérieure Polytechnique in Dakar is near
completion. In addition, our current long term
site in the Canary Islands will support AMMA, and
a proposed SMART-COMMIT site on Cape Verde may
also participate.

• MPLNET is a part of the established CALISPO
  cal/val plan, and we are gearing up for
  validation activities after launch.
• Direct validation of layer heights, extinction,
  AOT
• Statistical seasonal studies
• Look Up Table development aerosol
  extinction-to-backscatter ratio

South Pole MPLNET Site 1999-2006
New Generation MPL Type 4B Available from Sigma
Space Corp.

• MPL and MPLNET recently won Tech Transfer award
  from Federal Laboratory Consortium
• MPLNET team currently working with Sigma to
  incorporate athermal telescope for improved
  instrument stability in field

MPLNET will contribute to International Polar
Year activities
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Data Retrieval Aerosol Extinction Profile
MPLNET Combined Active Lidar and Passive
Photometer Continuous MPLNET lidar
observations PBL structure evolution readily
apparent Retrieved Aerosol Extinction
Profile
AERONET column Aerosol Optical Depth (AOD)
observation used as constraint to retrieve
vertical profile of aerosol extinction from the
MPL
Aerosol extinction-to-backscatter ratio is
calculated, this parameter is required for
satellite retrieval of extinction
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