Atmospheric Measurements during POPCORN — Characterisation by Christian Plass-Dülmer, Theo Brauers (auth.), J. Rudolph, R.

By Christian Plass-Dülmer, Theo Brauers (auth.), J. Rudolph, R. Koppmann (eds.)

Present coverage concerns hindrance the aid of ozone degrees via controlling its precursors, NOx and unstable natural compounds (VOC). VOC are emitted from anthropogenic and biogenic assets. while our realizing of VOC emissions from anthropogenic assets has complicated considerably lately, there's nonetheless a scarcity of information in regards to the contribution of biogenic VOC to the funds of natural hint gases and their effect at the formation of ozone within the troposphere. enhancing ozone aid suggestions sooner or later calls for a close figuring out of the chemical tactics within the troposphere.
This ebook includes the result of atmospheric measurements got in the course of the box crusade POPCORN (Photo-Oxidant Formation by way of Plant Emitted Compounds and OH Radicals in North-Eastern Germany) which was once performed to enquire the function and effect of biogenic hint gases on tropospheric chemistry. This quantity describes meteorological occasions and origins of air plenty throughout the crusade, and offers measurements of various hint gases, sunlight radiation and photolysis frequencies. particular awareness is given to OH radical measurements and the in-situ comparability of the 2 OH dimension techniques.

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This issue). g. Wameck, 1988). 7. , 1996). , 1996). POPCORN: A FIELD STUDY OF PHaTOCHEMISTRY IN NORTH-EASTERN GERMANY 27 This gives additional confidence that the novel 222Rn method which has been used for the first time during POPCORN is a useful and reliable method to determine deposition velocities. Additionally, a study of the diurnal profile of 222Rn and NOx was used to derive the magnitude of the NOx soil emissions. 8. Photolysis Frequencies Photolysis frequencies were determined by absolute UV spectroradiometric measurements in combination with molecular photodissociation data from literature (Kraus and Hofzumahaus, this issue).

In addition, 2 features of the humidity record need to be mentioned: 1. there was no diurnal modulation on August 11 when a storm with rain passed the site; and 2. 6) was established. This indicates that after the long dry period before the campaign, only small amounts of water were available at the surface. 3. OZONE MIXING RATIO The ozone mixing ratios ranged from below 10 ppb (during some nights) to 90 ppb on August 5 in the afternoon (Figure 3). The ozone data show a remarkable diurnal variation before August 6, with an amplitude of 50 ppb and more.

A. , 1992: The Mauna-Loa-Observatory Photochemistry Experiment, J. Geophys. Res. 97, 10285-10290. , Grobler, E. , Ehhalt, D. , 1998: Mixing ratios and photostationary state of NO and N02 observed during the POPCORN field campaign at a rural site in Gennany, 1. Atmos. Chern. 31, 119-137. , MUller, K. , 1996: Dry deposition of peroxyacetyl nitrate (PAN): detennination of its deposition velocity at night from measurements of the atmospheric PAN and 222Radon concentration gradient, Geophys. Res. Lett.

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