the globe aerosol monitoring project
DESCRIPTION
The GLOBE Aerosol Monitoring Project. Joris de Vroom, Tim Vlemmix, Folkert Boersma, Ellen Brinksma, Pieternel Levelt. Outline. The GLOBE program Measurement principle Campaign approach 2007 validation results. G LOBAL L EARNING AND O BSERVATIONS TO B ENEFIT THE E NVIRONMENT. - PowerPoint PPT PresentationTRANSCRIPT
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AK-CK praatje 20080529
The GLOBE aerosol measurement campaign
The GLOBE Aerosol Monitoring Project
Joris de Vroom, Tim Vlemmix, Folkert Boersma, Ellen Brinksma, Pieternel Levelt
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AK-CK praatje 20080529
The GLOBE aerosol measurement campaign
Outline The GLOBE program Measurement principle Campaign approach 2007 validation results
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The GLOBE aerosol measurement campaign
GLOBAL
LEARNING AND
OBSERVATIONS TO
BENEFIT THE
ENVIRONMENT
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The GLOBE aerosol measurement campaign
The international GLOBE program Students collect data that can be used for scientific research Students report on the internet 18,000 schools worldwide Elementary and secondary school students Various subjects: water, soil, vegetation, atmosphere,…
The GLOBE program at KNMI Since 2002 at KNMI Together with SME Aerosol Optical Thickness (AOT) Focus on OMI validation Goals
Education Science Public outreach
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The GLOBE aerosol measurement campaign
LED used as a photo cell: V ~ I
508 nm
625 nm
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The GLOBE aerosol measurement campaign
Comparison of
GLOBE Instrument
with
Professional instruments
Aero
sol O
pti
cal Th
ickn
ess
at
440
nm
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The GLOBE aerosol measurement campaign
year measurements
collocations
2002 0 0
2003 75 0
2004 41 0 (OMI launch)
2005 152 3
2006 66 19
2007 227 73
2008 124 41
Measurement campaigns
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The GLOBE aerosol measurement campaign
Validation
• jan-dec 2007
• N = 73
• t < 10 min
• CF < 0.1
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The GLOBE aerosol measurement campaign
•R(508) = 0.68
•R(625) = 0.77
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The GLOBE aerosol measurement campaign
tiviteitrepresentaomiglobeGauss222
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The GLOBE aerosol measurement campaign
tiviteitrepresentaomiglobeGauss222
)(
σ(Gauss) = 0.1 fit result
σ(globe) = 0.036
σ(omi) + σ(representativiteit) : 0.09 (= 34%)
Comparison with MODIS (over sea) σ(omi) = 30%
σ(omi) < 0.09
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The GLOBE aerosol measurement campaign
Seasonal cycle
Figures by Remco Braak
OMI AOT 483 nm MAM 2007
OMI AOT 483 nm SON 2007
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The GLOBE aerosol measurement campaign
Seasonal cycle
Spring bias (GLOBE-OMI):
Figures by Remco Braak
OMI AOT 483 nm MAM 2007
OMI AOT 483 nm SON 2007
globeomi *25.1
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The GLOBE aerosol measurement campaign
Conclusions σ(omi) < 0.09 In spring OMI overestimates AOT First quantitative validation of OMI AOD with
student measurements Campaign stategy very successful
Outlook Spring and autumn campaign 2008 Extend with 20 new schools New approach: combining of two channels quantitative OMI validation results into (JGR)
paper
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The GLOBE aerosol measurement campaign
Lopussa…….