Satellite Remote Sensing of Ground-Level NO
Download
1 / 12

Satellite Remote Sensing of Ground-Level NO 2 for New Brunswick - PowerPoint PPT Presentation


  • 108 Views
  • Uploaded on

Satellite Remote Sensing of Ground-Level NO 2 for New Brunswick. Randall Martin and Lok Lamsal Dalhousie University. Major Nadir-viewing Space-based Measurements of AQHI Species. Solar Backscatter & Thermal Infrared. Proposed: MCAP (CSA), GEO-CAPE (NASA).

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Satellite Remote Sensing of Ground-Level NO 2 for New Brunswick' - ivie


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Satellite Remote Sensing of Ground-Level NO2 for New Brunswick

Randall Martin and Lok Lamsal

Dalhousie University


Major nadir viewing space based measurements of aqhi species
Major Nadir-viewing Space-based Measurements of AQHI Species

Solar Backscatter&Thermal Infrared

Proposed: MCAP (CSA), GEO-CAPE (NASA)



Tropospheric no 2 column proxy for surface concentration
Tropospheric NO and In Turn Simulations 2 Column Proxy for Surface Concentration

NO/NO2 

with altitude

OMI Tropospheric NO2 Column (1015 molecules cm-2) for 2005

Daily Retrieval Uncertainty: 1x1015 molec cm-2 + 30% of trop column

Data from Lamsal et al., JGR, in press


General approach to estimate surface concentration

In Situ and In Turn Simulations

GEOS-Chem

General Approach to Estimate Surface Concentration

Coincident Model Profile

Daily Observed Column

  • S→ Surface Concentration

  • Ω → Tropospheric column


Significant correlation between in situ and omi derived surface no 2 less clear for new brunswick
Significant Correlation Between In Situ and OMI-derived Surface NO2; Less Clear for New Brunswick

DOMINO

Correlation with Coincident “Corrected” Observations over 2005

Lamsal et al., JGR, 2008


New Brunswick Generally Has Low NO Surface NO2 Concentrations

Annual mean in early afternoon ~13:45 for 2005

OMI-derived Surface NO2 Concentration (ppbv)


... However There are Transient Events Surface NO

Early Afternoon (13:00 – 14:00) NO2 Concentration

Mean OMI-derived NO2 for New Brunswick


More Analysis Needed for Direct Comparison Surface NO

Collocated measurements (OMI Black x 5)

Different spatial scales

No NOz interference correction

Local sources?


Interference in molybdenum converter measurements in southeast us yrk
Interference in Molybdenum Converter Measurements in Southeast US (YRK)

Photolytic / Molybdenum

Modeled (GEOS-Chem)

~NO2 / 0.1*ΔO3 [14:00 – 10:00] (Boersma et al., ACP, 2009)

Lamsal et al., JGR, in press


Omi observes during minimum no 2 observations from epa air quality network
OMI Observes During Minimum NO Southeast US (YRK)2Observations from EPA air quality network

mean

median

Lamsal et al., JGR, 2008


Possible strategy
Possible Strategy Southeast US (YRK)

Use satellite to monitor for extreme events

(i.e. when partial AQHI from NO2 exceeds a threshold)

Issues

  • Examine wintertime spikes; caution over snow

  • Interference in ground-based NO2 measurements

  • Assess diurnal variation with in situ

  • Cloud-free: test clear sky bias

  • “Row Anomaly” restricts OMI Coverage; may need to consider GOME-2


ad