Atmospheric Measurements During POPCORN -- Characterisation of the Photochemistry over a Rural Area

Present policy issues concern the reduction of ozone levels by controlling its precursors, NO__x__ and volatile organic compounds (VOC). VOC are emitted from anthropogenic and biogenic sources. Whereas our understanding of VOC emissions from anthropogenic sources has advanced significantly in recent years, there is still a lack of knowledge concerning the contribution of biogenic VOC to the budget of organic trace gases and their impact on the formation of ozone in the troposphere. Improving ozone reduction strategies in the future requires a detailed understanding of the chemical processes in the troposphere. This book comprises the results of atmospheric measurements obtained during the field campaign POPCORN (**P**hoto-**O**xidant Formation by **P**lant Emitted **C**ompounds and **O**H **R**adicals in **N**orth-Eastern Germany) which was carried out to investigate the role and impact of biogenic trace gases on tropospheric chemistry. This volume describes meteorological situations and origins of air masses during the campaign, and presents measurements of a variety of trace gases, solar radiation and photolysis frequencies. Special attention is given to OH radical measurements and the in-situ comparison of the two OH measurement techniques. Front Matter....Pages I-3 POPCORN: A Field Study of Photochemistry in North-Eastern Germany....Pages 5-31 Meteorological Aspects, Ozone, and Solar Radiation Measurements During POPCORN 1994....Pages 33-52 Measurements of Carbon Monoxide and Nonmethane Hydrocarbons During POPCORN....Pages 53-72 Measurements of Volatile Organic Compounds (VOC) During POPCORN 1994: Applying a New On-Line GC—MS-Technique....Pages 73-103 Measurements of Atmospheric Formaldehyde (HCHO) and Acetaldehyde (CH 3 CHO) during POPCORN 1994 Using 2.4-DNPH Coated Silica Cartridges....Pages 105-117 Mixing Ratios and Photostationary State of NO and NO 2 Observed During the POPCORN Field Campaign at a Rural Site in Germany....Pages 119-137 Peroxyacetyl Nitrate (PAN) Measurements During the POPCORN Campaign....Pages 139-159 Field Measurements of Atmospheric Photolysis Frequencies for O 3 , NO 2 , HCHO, CH 3 CHO, H 2 O 2 , and HONO by UV Spectroradiometry....Pages 161-180 In-situ Measurements of Tropospheric Hydroxyl Radicals by Folded Long-Path Laser Absorption During the Field Campaign POPCORN....Pages 181-204 Highly Time Resolved Measurements of OH during POPCORN Using Laser-Induced Fluorescence Spectroscopy....Pages 205-225 Intercomparison of Tropospheric OH Measurements by Different Laser Techniques during the POPCORN Campaign 1994....Pages 227-246 Present policy issues concern the reduction of ozone levels by controlling its precursors, NO x and volatile organic compounds (VOC). VOC are emitted from anthropogenic and biogenic sources. Whereas our understanding of VOC emissions from anthropogenic sources has advanced significantly in recent years, there is still a lack of knowledge concerning the contribution of biogenic VOC to the budget of organic trace gases and their impact on the formation of ozone in the troposphere. Improving ozone reduction strategies in the future requires a detailed understanding of the chemical processes in the troposphere. This book comprises the results of atmospheric measurements obtained during the field campaign POPCORN ( P hoto- O xidant Formation by P lant Emitted C ompounds and O H R adicals in N orth-Eastern Germany) which was carried out to investigate the role and impact of biogenic trace gases on tropospheric chemistry. This volume describes meteorological situations and origins of air masses during the campaign, and presents measurements of a variety of trace gases, solar radiation and photolysis frequencies. Special attention is given to OH radical measurements and the in-situ comparison of the two OH measurement techniques.

Present policy issues concern the reduction of ozone levels by controlling its precursors, NOx and volatile organic compounds (VOC). VOC are emitted from anthropogenic and biogenic sources. Whereas our understanding of VOC emissions from anthropogenic sources has advanced significantly in recent years, there is still a lack of knowledge concerning the contribution of biogenic VOC to the budget of organic trace gases and their impact on the formation of ozone in the troposphere. Improving ozone reduction strategies in the future requires a detailed understanding of the chemical processes in the troposphere.
This book comprises the results of atmospheric measurements obtained during the field campaign POPCORN (Photo-Oxidant Formation by Plant Emitted Compounds and OH Radicals in North-Eastern Germany) which was carried out to investigate the role and impact of biogenic trace gases on tropospheric chemistry. This volume describes meteorological situations and origins of air masses during the campaign, and presents measurements of a variety of trace gases, solar radiation and photolysis frequencies. Special attention is given to OH radical measurements and the in-situ comparison of the two OH measurement techniques.