1 / 8

Konstantin Vinnikov and Russell Dickerson – University of Maryland at College Park

DIURNAL AND SEASONAL VARIATIONS OF SO 2 and OTHER ATMOSPHERIC POLLUTANTS OBSERVED AT PINEY RUN STATION AND ITS VICINITY. Konstantin Vinnikov and Russell Dickerson – University of Maryland at College Park Nickolay Krotkov – GSFC/NASA

fsnell
Download Presentation

Konstantin Vinnikov and Russell Dickerson – University of Maryland at College Park

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DIURNAL AND SEASONAL VARIATIONS OF SO2 and OTHER ATMOSPHERIC POLLUTANTS OBSERVED AT PINEY RUN STATION AND ITS VICINITY Konstantin Vinnikov and Russell Dickerson – University of Maryland at College Park Nickolay Krotkov – GSFC/NASA Edwin Gluth and Najma Khokhar – Maryland Department of Environment Frostburg, MD Campaign Data Meeting. GSFC, January 27, 2011

  2. There are two surface stations with multi-year hourly CO observation in MD. The Beltsville’s record before October 2007 does not look homogeneous and is excluded from analysis. • CO Diurnal cycle in both sites is almost negligible. • CO Seasonal cycle in both sites is very week but well pronounced with summer time minimum. • The estimates of scales of CO temporal autocorrelation exceed 8 hours at Frostburg Reservoir station for all seasons and at Beltsville, MD station – for cold season. Warm season scale estimates at Beltsville, MD are mostly smaller and are about 6 hours. • These scales estimates does not have noticeable diurnal cycle.

  3. BELTSVILLE, MD: • Suburban environment. • Traffic emissions. • Well pronounced seasonal and diurnal cycles in SO2. • PINEY RUN, MD: • Altitude is 777 m. • Strong seasonal cycle. • Strong diurnal cycle in SO2 without known sources of local emissions.

  4. SHENANDOAH NATIONAL PARK: • This station is ~1 km above sea level. • No local SO2 emissions. • Very weak diurnal cycle. • Noticeable seasonal cycle Altitude = 1073 m above MSL

  5. SO2 LOCAL RESIDENCE TIME IN HOURS It is assumed that lag-correlation functions of observed temporal SO2 variations can be approximated as R(t) =exp(-τ/T),where τis lag, and T is decay time. This time is needed for observed anomaly of SO2 concentration to decrease e times. For two physical processes with decay times T1 and T2, the resulted decay time 1/T=1/T1+1/T2 or T=T1T2 / (T1+T2). The resulted T is always smaller than the smallest of T1and T2. Piney Run estimates: T1≈10h is Meteorological Processes Time Scale for CO. T≈5h is SO2 Local Residence Time Scale. T2≈10h is estimate of SO2 Chemical Life Time Scale

  6. CURRENTLY AVAILABLE 2010 DATA OF OBSERVATION AT PINEY RUN STATION. All these data will be quality controlled and corrected, if necessary. The relevant emissions data are not yet available for the 4th Quarter of 2010.

  7. PINEY RUN, MD AIR QUALITY STATION. ELEVATION ≈ 777m ABOVE MSL. 2010: DIURNAL-SEASONAL VARIATIONS IN THE OBSERVED CONCENTRATIONS OF ATMOSPHERIC POLLUTANTS

  8. Preliminary conclusions: • Observations reveal well pronounced diurnal and seasonal variations of main atmospheric pollutants at Piney Run station. • Full 2010 observation data are not yet available. They will be quality controlled and released a few months later. • Statistically evaluated scale of residence time of SO2 fluctuations at Piney Run is about 5 hours. • Statistically evaluated scale of residence time of CO fluctuations at Piney Run is about 10 hours. • Estimated scale of chemical life time of SO2 at Piney Run is about 10 hours.

More Related