Weekend Effect Research

All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
 5 views
of 16

Please download to get full document.

View again

Description
Weekend Effect Research. Ozone Precursor Trends (Chapter 5.2) April 13, 2000. Ozone Precursor Trends. Objectives of trend analysis: ID response of ozone to precursor changes ID spatial & temporal changes ID changes in chemistry. Ozone Precursor Trends. Methodology:
Share
Transcript
Weekend Effect ResearchOzone Precursor Trends(Chapter 5.2)April 13, 2000Ozone Precursor Trends
  • Objectives of trend analysis:
  • ID response of ozone to precursor changes
  • ID spatial & temporal changes
  • ID changes in chemistry
  • Ozone Precursor Trends
  • Methodology:
  • hrly mean CO, NOX, NO, NO2, & O3, 1980-97
  • Day of Week (DOW) -- Tue-Thur = mid-week
  • averaged into 6 equal Periods of Day (POD)
  • running 3-year means
  • Ozone Precursor Trends
  • ID response of ozone to precursor change
  • SoCAB peak ozone has declined steadily
  • PM ozone declined in most areas of SoCAB
  • ozone decline for WDs appears WEs
  • Ozone Trends in SoCABOzone TrendsOzone TrendsOzone Precursor Trends
  • ID spatial & temporal changes
  • mid-day NOX trends generally similar by DOW
  • 4-8 a.m. NOX trend often nearly flat in 1990s
  • O3 DOW “crossover” in late 1980s in eastern SoCAB
  • Ozone Precursor TrendsOzone Precursor TrendsOzone TrendsOzone Precursor Trends
  • ID changes in chemistry:
  • mid-AM NOX trend often flat but late-AM & early-PM NOX & NO2 down in 1990s
  • NO2 trends by DOW match NOX trends by DOW at most sites - NO2/NOX constant by DOW during late-AM & early-PM
  • Ozone Precursor TrendsOzone Precursor TrendsOzone Precursor Trends
  • Initial Findings:
  • peak ozone down irrespective of NOX trend
  • ozone WE Effect much greater in 1990s than earlier but no commensurately greater NOX WE Effect
  • DOW “crossover” (WE > WD) has now occurred at all sites in SoCAB
  • Ozone Precursor Trends
  • Recommendation:
  • Investigate cause of step-wise change in mid-day ozone concentrations around 1989 as it accounts for much of ozone improvement and seems stronger for WDs than WEs.
  • Related Search
    We Need Your Support
    Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

    Thanks to everyone for your continued support.

    No, Thanks
    SAVE OUR EARTH

    We need your sign to support Project to invent "SMART AND CONTROLLABLE REFLECTIVE BALLOONS" to cover the Sun and Save Our Earth.

    More details...

    Sign Now!

    We are very appreciated for your Prompt Action!

    x