[1] Measurements of the biogenic hydrocarbons isoprene and 2-methyl-3-buten-2-ol (MBO), their first-, second-, and third-generation photooxidation products methacrolein (MACR), methyl vinyl ketone (MVK), acetone, 2-hydroxy-2-methylpropanal (2-HMPR), glycolaldehyde, hydroxyacetone, methylglyoxal, and glyoxal, and carbon monoxide (CO), were obtained above a ponderosa pine plantation, near the Blodgett Forest Research Station, California on 15–19 August and 11–15 September 2000. Diurnal cycles for all the compounds were similar, with maximum mixing ratios in the afternoon and minimum mixing ratios in the early morning. The diurnal cycles of the second-generation isoprene photooxidation products were similar to their precursors, while changes in 2-HMPR, a compound unique to MBO photooxidation, lagged behind corresponding changes in MBO. These observations are consistent with transport of isoprene and its photooxidation products from a strong source several hours upwind, and a predominantly local source of MBO with in situ photochemical production of 2-HMPR. Glycolaldehyde and hydroxyacetone mixing ratios exceeded the mixing ratios of their biogenic precursors on days with high CO, and were generally correlated more strongly with CO than with their biogenic precursors. The agreement between measured product ratios and ratios predicted by a box model improved when anthropogenic precursors were added to the model. Quantification of the source apportionment demonstrated that photooxidation of anthropogenic precursors contributed significantly to the mixing ratios of glycolaldehyde and hydroxyacetone measured in this rural environment. More research into the photochemistry and yields of multifunctional carbonyl compounds from hydrocarbon photooxidation is needed in order for models to accurately predict their role in tropospheric chemistry.

Secondary Atmospheric Photooxidation Products: Evidence for Biogenic and Anthropogenic Sources

This study presents time series for tropospheric amounts of formaldehyde (HCHO) and glyoxal (CHOCHO) retrieved from MAX-DOAS measurements at the DANDELIONS field campaigns that took place at Cabauw (The Netherlands) from May to July 2005 and in September 2006. These results are compared to SCIAMCHY satellite data. Both remote sensing techniques are in excellent agreement within their error bars. It is shown that the ground-based MAX-DOAS in combination with an automated profile retrieval is a powerful tool in establishing long-term observations of tropospheric trace gases and facilitating the validation of tropospheric column amounts from satellite instruments. The precision of the satellite data (monthly average) has been estimated to be about 4x10 15

Satellite validation of tropospheric trace gases with max-doas measurements during the dandelions field campaigns in 2005 and 2006

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Satellite validation of tropospheric trace gases with max-doas measurements during the dandelions field campaigns in 2005 and 2006