the great midwestern pm2 5 episode of february 2005 l.
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The Great Midwestern PM2.5 Episode of February 2005. A compendium of data from the LADCO ftp site Compiled by Donna Kenski from data contributed by Rudy Husar, Wash. Univ; Matthew Harrell, Ill EPA; Neal Conatser, Mich. DEQ; Bob Swinford, Ill. EPA; and Jay Turner, Wash. Univ. Background.

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the great midwestern pm2 5 episode of february 2005

The Great Midwestern PM2.5 Episode of February 2005

A compendium of data from the LADCO ftp site

Compiled by Donna Kenski

from data contributed by

Rudy Husar, Wash. Univ; Matthew Harrell, Ill EPA; Neal Conatser, Mich. DEQ; Bob Swinford, Ill. EPA; and Jay Turner, Wash. Univ.

background
Background
  • Midwest experienced a multiday PM episode from ~Jan 28 to Feb 7, 2005
  • Concentrations led to AQIs > 100, poor visibility, media attention
  • LADCO dedicated an ftp site as a repository for episode-related data and information
  • Email listserv of interested analysts periodically share new info as it becomes available
  • LADCO intends to produce a summary of the episode that will include some historical perspective, meteorological factors, etc. Others (Canadians) are modeling the episode; AIRNOW is presenting paper to AMS.
  • Slides that follow are examples of data available and posted to ftp site
regional average pm25 concentration pattern based on airnow
Regional Average PM25 Concentration PatternBased on AIRNOW

From Rudy Husar

  • Time pattern of the 0502 Event
    • The overall event lasted about 10 days, Jan 28-February 7
    • The Upper Midwest peaked first (Jan 31-Feb 2); Industrial MW later (Feb 3 – 6)
    • The Industrial MW region show more diurnal variation (lowest in the mid-afternoon)

0502 PM Event

PM Event

airnow

From Rudy Husar

AIRNOW

Jan.24, 2005

Jan.25, 2005

Jan.26, 2005

Jan.27, 2005

Jan.28, 2005

Jan.29, 2005

Jan.30, 2005

Jan.31, 2005

Feb. 1, 2005

Feb. 2, 2005

Feb. 3, 2005

Feb. 4, 2005

Feb. 5, 2005

Feb. 6, 2005

slide5

From Matt Harrell, Illinois EPA

February 3, 2005

24-hr PM2.5 Values

Data obtained from USEPA's AIRNOW mapping system. All values are unverified.

slide7

24 hr Average PM-2.5 Concentrations in Michigan (1/26/05 thru 2/10/05)

From Neal Conatser, Mich. DEQ

slide8

Dirty Below / Clean Above

From Neal Conatser, Mich. DEQ

slide9

12Z Soundings (02/01/05 to 02/08/05)

From Neal Conatser, Mich. DEQ

slide10

24 hr Average PM-2.5 Concentrations in Michigan (1/26/05 thru 2/10/05)

warm air advection

cold front approaches

From Neal Conatser, Mich. DEQ

strong cold front passes

weak cold front passes

slide11

Jan 30 2005

Jan 31 2005

Feb 1 2005

Feb 2 2005

Feb 3 2005

Feb 4 2005

Feb 5 2005

Feb 6 2005

Plots of average daily temperature from Midwest Climate Center

Feb 7 2005

slide12

Jan. 30 2005

Jan 31 2005

Feb 1 2005

Feb 2 2005

Feb 3 2005

Feb 4 2005

Feb 5 2005

Feb 6 2005

Maps of snow cover from NOAA:

http://www.ssd.noaa.gov/PS/SNOW/

Feb 7 2005