On the Content of Nitrogen in Atmospheric Precipiation in Sweden. II

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Abstract
In the present paper an attempt is made to give a general idea of the geographical distribution of fixed nitrogen (NH4-N) transferred to the soil through precipitation in Sweden. Further a map is given showing the distribution af α, a quantity proportional to the nitrogen concentration in the precipitation at the beginning of a rain and, it is assumed, representative for the content of fixed nitrogen in the atmosphere before the rain is falling. A discussion of different causes of the concentration of fixed nitrogen in precipitation is presented and a photochemical process is suggested, which would explain the almost constant ratio between NH4-N and NO2-N frequently found within the temperate zones. It is evident, however, that other causes also are at work, especially at lower latitudes. The need of laboratory experiments is emphasized. DOI: 10.1111/j.2153-3490.1952.tb01013.x
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