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Monitoring of Transatlantic Long Range Transport of Tropospheric NO 2 – Observation and Simulation. Bas Mijling Bart Dils Ronald van der A Ruud Dirksen. Part 1 Observation. Observation LRT with satellites. Why tropospheric NO 2 ? Relatively easy to measure Relation with tropospheric O 3 - PowerPoint PPT Presentation
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TEMIS user workshop, Frascati, 8-9 October 2007
Monitoring of TransatlanticLong Range Transport of Tropospheric NO2
– Observation and Simulation
Bas MijlingBart Dils
Ronald van der ARuud Dirksen
TEMIS user workshop, Frascati, 8-9 October 2007
Part 1Observation
TEMIS user workshop, Frascati, 8-9 October 2007
• Why tropospheric NO2?– Relatively easy to measure
– Relation with tropospheric O3
• Why OMI? – Daily global coverage; high resolution
• Why Atlantic region?– Predominant westerly winds transport air
pollutants from East US to West Europe
Observation LRT with satellites
TEMIS user workshop, Frascati, 8-9 October 2007
Basic mechanism of long range transport
1. Rapid uplift 2. Fast horizontal transport
East Asian outflowof tropospheric NO2
observed by OMI26 May 2007
TEMIS user workshop, Frascati, 8-9 October 2007
Shielding effects of clouds
NO2
ghost
column
NO2
above the
cloudstroposph.
NO2
column
)(4,
,1
TMtrop
ghoststratslsl
obs N
Nw
AMF
NNN
vghostvobs NwNNwN )1()(
AMF
NNN
stratslsl
v
,
Surf. albedo0.02
Cloud at 800 hPa
TEMIS user workshop, Frascati, 8-9 October 2007
Event I: Transatlantic NO2 transport
2-12-2005 3-12-2005
5-12-20054-12-2005
TEMIS user workshop, Frascati, 8-9 October 2007
22-12-2005 23-12-2005
25-12-200524-12-2005
Event II: Transatlantic NO2 transport
TEMIS user workshop, Frascati, 8-9 October 2007
6-2-2007 7-2-2007
9-2-20078-2-2007
Event III: Backflow from Europe
TEMIS user workshop, Frascati, 8-9 October 2007
29-7-2007 30-7-2007
1-8-200731-7-2007
Event IV: Forest fires on the Canaries
TEMIS user workshop, Frascati, 8-9 October 2007
Data quality: OMI collection 3
- Level 0-1: Improved dark current correction
- Level 1-2: Averaged solar irradiance spectrum
- Improved signal to noise ratio (noise floor now at ~0.2 1015 molec/cm2)
- No cross-track gradient (no artifacts at overlapping tracks)
- Still some striping problem (to be corrected for with filter)
Collection 2 Collection 3
TEMIS user workshop, Frascati, 8-9 October 2007
Part 2Observation & Simulation
TEMIS user workshop, Frascati, 8-9 October 2007
OMI observation / FLEXPART simulation
Flexpart, 14 Jan 2007 OMI, 14 Jan 2007
OMI less sensitive to NO2 in lower troposphere
TEMIS user workshop, Frascati, 8-9 October 2007
OMI observation / FLEXPART simulation
Flexpart, 6 Jan 2007 OMI, 6 Jan 2007
TEMIS user workshop, Frascati, 8-9 October 2007
http://www.temis.nl/lrt
- Height dependency- Frequency (seasonality)- Quantify transport
TEMIS user workshop, Frascati, 8-9 October 2007
Future activities
• Reprocessing OMI data using collection 3
• Implementation destriping filter
• New data-format (HDF5 instead of ASCII)
• Other areas (East Asia, South Africa, …)
• Other satellite instruments (GOME-2)
• Quantifying transport
• Correlation with background stations
TEMIS user workshop, Frascati, 8-9 October 2007
Thank you for your attention!
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