GLOBAL TROPOSPHERIC DISTRIBUTION AND CALIBRATION SCALE OF HCFC-22

被引：75

作者：

MONTZKA, SA ^{[1
]}

MYERS, RC ^{[1
]}

BUTLER, JH ^{[1
]}

ELKINS, JW ^{[1
]}

CUMMINGS, SO ^{[1
]}

机构：

[1] UNIV COLORADO,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309

来源：

GEOPHYSICAL RESEARCH LETTERS | 1993年 / 20卷 / 08期

关键词：

D O I：

10.1029/93GL00753

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Measurements of atmospheric chlorodifluoro-methane (HCFC-22), based upon a new calibration scale developed in this laboratory, suggest a global tropospheric mean that is approximately 28% lower than determined previously from surface-based measurements. A global mean of 10 1.8 (+/- 1.2, 1 sd.) ppt and interhemispheric difference of 13 (+/- 1) ppt were determined for HCFC-22 in 1992 from air collected in flasks from seven remote sites located between 82-degrees-N and 90-degrees-S. These results are consistent with mixing ratios predicted from recent emission estimates and a lifetime for HCFC-22 of 13.6 (+1.9,-1.5) yr. Based upon the analysis of flasks and archived air samples from mid-I 987 through 1992, a mean growth rate for HCFC-22 of 7.3 (+/- 0.3)% yr-1 was estimated for this period.

引用

页码：703 / 706

页数：4

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