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FASTNET Report: 0409FebMystHaze

FASTNET Report: 0409FebMystHaze. Mystery Winter Haze: Natural? Nitrate/Sulfate? Stagnation?. AIRNOW PM25 - February. Contributed by the FASNET Community, Sep. 2004 Correspondence to R Husar , R Poirot Coordination Support by

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FASTNET Report: 0409FebMystHaze

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  1. FASTNET Report: 0409FebMystHaze Mystery Winter Haze: Natural? Nitrate/Sulfate? Stagnation? AIRNOW PM25 - February Contributed by the FASNET Community, Sep. 2004 Correspondence to R Husar , R Poirot Coordination Support by Inter-RPO WG Fast Aerosol Sensing Tools for Natural Event Tracking, FASTNET NSF Collaboration Support for Aerosol Event Analysis NASA REASON Coop EPA -OAQPS

  2. Secondary MP25 Peak in February-March • The AIRNOW PM25 data are available real-time for 300+ stations since July 2002. • The 30-day smoothing of the average hourly data shows the Eastern US PM25 seasonality • The seasonal pattern shows the summertime sulfate peak and a second Feb/Mar peak • The the existence, characteristics and origin of this regional peak is not known • The objective of effort is to characterize this ‘mysterious’ phenomenon over the EUS • The approach is to seek out the community as a resource for collaborative analysis Sulfate-driven Jul-Aug peak Feb-Mar peak, of unknown origin

  3. Seasonal PM25 by Region The 30-day smoothing average shows the seasonality by region The Feb/Mar PM25 peak is evident for the Northeast, Great Lakes and Great Plains This secondary peak is absent in the South and West

  4. PM25 Monthly Concentration AIRNOW Jul 02-Sep 04 Blue: 0 Red: 25 • Monthly average PM25 are shown as circle and contour (Blue: 0; Red: 25 mg/m3) • The Feb/Mar peak is clearly evident in the Upper Midwest region MAR APR JAN FEB MAY JUN JUL AUG SEP OCT NOV DEC

  5. EPA AIRS 1999-2002 FRM PM25 Monthly Concentration • Monthly average FRM PM25 are shown as circle and contour (Blue: 0; Red: 25 mg/m3) • The Feb/Mar peak is clearly evident in the Midwest region; also in January • Hence, there is some deviation in peak location and time among the networks MAR APR JAN FEB MAY JUN JUL AUG SEP OCT NOV DEC

  6. Satellite Data: POLDER Aerosol Polarization Index Dauze et. al, 2001 • The (short-lived, Nov 96-Jun97) POLDER satellite sensor measured the of aerosol polarization, which is sensitive to fine particles, < 1 mm • For Jan-Mar the data show a strong aerosol signal over the Upper Midwest and adjacent Canada • Skeptics have attributed the ‘anomalous’ aerosol zone to interferences such as snowy ground reflectance • In light of the recent ground-based PM25 monitoring data, the early (1997) POLDER results deserve full attention

  7. Satellite Data: MISR Aerosol Optical Thickness • The MISR sensor on Terra satellite performs multi-angle (60-150 deg?) scans for aerosol retrieval • Four years of AOT data over land (2001-04) provide further evidence of the Jan-Mar aerosol peak • Interestingly, both POLDER and MISR show the aerosol patch extending deep into Central Canada

  8. Where do we go from here? • Is it real ???

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