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Seasonal Variation of HCHO Columns Measured by GOME in July 1996

Explore high HCHO levels reflecting VOC emissions from various sources like fires, biosphere, and human activities. Detailed data and analysis available for the Ozarks region in July 1996, highlighting the temperature dependency of isoprene emission and consistency with GEIA data. Follow the GOME mission's spatial coverage and preliminary SCIAMACHY observations, coinciding with INTEX-NA campaign flights. Discover insights into NO2 levels, cloud dynamics, and atmospheric events over specific locations during the period.

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Seasonal Variation of HCHO Columns Measured by GOME in July 1996

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  1. 2.5 2 1.5 1 0.5 0 -0.5 HCHO COLUMNS MEASURED BY GOME (JULY 1996) Units of 1016 molecules cm-2 Uncertainty ~1x1016 molecules cm-2 (~2 ppbv in 2 km boundary layer) South Atlantic Anomaly (disregard) High HCHO regions reflect VOC emissions from fires, biosphere, human activity Data availability: All of GOME mission!

  2. OZARKS “ISOPRENE VOLCANO” AS SEEN BY GOME Temperature dependence of isoprene emission (GEIA) GOME HCHO columns over the Ozarks, July 1996: daily orbits and relationship to temperature

  3. SEASONALITY OF GOME HCHO COLUMNS (1997)Largely reflects seasonality of isoprene emissions;general consistency with GEIA but also some notable differences GOME GEOS-CHEM (GEIA) GOME GEOS-CHEM (GEIA) MAR JUL APR AUG SEP MAY JUN OCT

  4. Current GOME spatial coverage

  5. Preliminary SCIAMACHY HCHO Four orbits in June, 2004

  6. Preliminary SCIAMACHY HCHO Four orbits in June, 2004, 43 binning

  7. Preliminary SCIA / in situ comparison Chris Sioris Smithsonian Astrophysical Observatory Randall Martin Dalhousie University

  8. Total NO2 VCD (geometric AMF), strat VCD=~3e15 molec/cm2, 0.5x0.5 regridding Orbits coincident with DC-8 during INTEX-NA (July1-25th)

  9. July 1st Tropopause at 11 km Trop columns < 11 km by nadir-limb subtraction

  10. July 6th • NO2 from lightning ? • Cloud and rain over Southwest Iowa (e.g. Fort Madison) between 9:30 and 10:30, then clear by 10:55 (wunderground.com) TOMS: 11:16 am Eq. X-ing LT

  11. July 6th, 2004 (cont’d): INTEX-NA shifts to midwest

  12. SCIAMACHY near-IR observations at ~39  N, ~89 W Cloud top at 13.5 km +/- 1.3 km, i.e. almost to tropopause

  13. Hagerstown, MD (pop’n: 37 000) ← (http://www.creativemethods.com/airquality/sources/)

  14. July 12th Twin cities New Orleans Houston

  15. July 18th • [Highest column: Paraguay (orbit 12460)]

  16. July 20th Toronto New Haven

  17. July 22nd • forgotten

  18. July 25th Twin cities Chicago ARKANSAS

  19. Conclusions • Clouds: major problem • Limb pointing: very minor problem • Spatial variability: major problem

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