The deductio of hydroxyl radical atmospheric background concentration and its seasonam variation by the observation of Cl2C=CCl2 and MeCCl3
碩士 === 國立中央大學 === 化學系 === 85 === Hemispheric averaged background mixing ratios of CCl2＝ CCl2 during the period 1988-1996 are reported for the northern and southern hemispheres. These data were generated form the 71N to 46S. Pronounced seasonal variation i...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
1997
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| Online Access: | http://ndltd.ncl.edu.tw/handle/28105514935946919681 |
| Summary: | 碩士 === 國立中央大學 === 化學系 === 85 === Hemispheric averaged background mixing ratios of CCl2＝
CCl2 during the period 1988-1996 are reported for the northern
and southern hemispheres. These data were generated form the 71N
to 46S. Pronounced seasonal variation in the atmospheric
abundance of CCl2＝CCl2 was observed in the northern hemisphere
with annual maximum in the summer and minimum in the winter,
suggesting a strong interplay between hydroxyl radicals and CCl2
＝CCl2 molecules. Models of different types were developed to
deduce the hemisphric average hydroxyl radical abundance and
constraining the resulting CCl2＝CCl2 mixing ratios with our
observed hemispheric averages, the average hydroxyl radical
abundance was deduced to be about 2.3×10^6#/c.c. and the ratio
of maximum concentration versus minimum concentration was about
4.1. Modeling of the trend of CH3CCl3 was also performed based
on the UCI measurements of CH3CCl3 in the same period as for C2
Cl4. The results were compared with those deduced by the ALE/
GAGE. Excellent agreement was found between these two
independent data sets. In this work, we are showing that the
availability of more than one data set of CH3CCl3 provides a
better constrain on the estimate of hydroxyl radical
concentrations.
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