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      <marc:subfield code="a">Christie, A. D., </marc:subfield>
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      <marc:subfield code="a">Digitized edition from print [produced by Environment and Climate Change Canada].</marc:subfield>
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      <marc:subfield code="a">"CIR 4214."</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (pages 58-68).</marc:subfield>
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      <marc:subfield code="a">"A brief presentation of the various basic equations specifying physical processes in the atmosphere suggests practical limitations in elucidating these processes in various time scales and regions of the atmosphere. The conservatism of various tracers and their measurement is discussed. The tracers considered most appropriate to various spatio temporal scales of atmospheric system are collated and presented, and finally discussed in relation to mass transfer models within the stratosphere and through the tropopause"--Abstract.</marc:subfield>
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