In the past 40 years, atmospheric chemists have come to realize that halogens exert a
powerful influence on the chemical composition of the troposphere and through that …

Measurements of ozone throughout the troposphere clearly show an annual cycle. Over the
last couple of decades it has become apparent that the measured annual cycle of ozone in …

Despite more than 20 years of regulatory efforts, concern is widespread that ozone pollution
in the lower atmosphere, or troposphere, threatens the health of humans, animals, and …

There is increasing evidence that at polar sunrise sunlight-induced changes in the
composition of the lower Arctic atmosphere (0–2 km) are taking place that are important …

The principal oxidants in the lower atmosphere are ozone (O3) and two by-products of
O3photodissociation, the hydroxyl radical (OH) and hydrogen peroxide (H2O2). A number of …

The relationship between O3 and NOx (NO+ NO2) which was measured during summer and
winter periods at Niwot Ridge, Colorado, has been analyzed and compared to model …

During springtime in the polar regions, unique photochemistry converts inert halide salt ions
(eg Br−) into reactive halogen species (eg Br atoms and BrO) that deplete ozone in the …

1.2 Carbon Dioxide 1 2 1 The Cycle of Carbon in Nature 12 11 The role of the atmosphere
12 12 The role of the ocean 12 13 The role of terrestrial vegetation and soils 1 2 2 …

Halogen chemistry is well known for ozone destruction in the stratosphere, however reactive
halogens also play an important role in the chemistry of the troposphere. In the last two …

ALTHOUGH petroleum is an important energy resource, there is still much to learn about its
composition that would be of practical importance in exploration, refining and the …