THE OBSERVED RELATIONSHIP BETWEEN THE SOUTH-POLE 225-GHZ ATMOSPHERIC OPACITY AND THE WATER-VAPOR COLUMN DENSITY

被引:28
作者
CHAMBERLIN, RA
BALLY, J
机构
[1] UNIV COLORADO,DEPT ASTROPHYS PLANETARY & ATMOSPHER SCI,BOULDER,CO 80309
[2] YERKES OBSERV,CTR ASTROPHYS RES ANTARCTICA,WILLIAMS BAY,WI 53191
来源
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES | 1995年 / 16卷 / 05期
关键词
D O I
10.1007/BF02066665
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We compare our previously reported measurements of South Pole 225 GHz atmospheric opacity, tau, to the column of precipitable water vapor (PWV) which was derived from concurrent upper air soundings. From this comparison we found that tau = (2.8 +/- 0.1) x 10(-2) + (6.9 +/- 0.2) x 10(-2) x PWV with tau in units of nepers/airmass and PWV in units of mm of precipitable H2O. We compared our results to predictions from Grossman's AT atmospheric transparency model which is widely used in the radio astronomy community. The coefficient of the second term of the above relation, 0.069, was consistent with the predictions from the model; however, the first term, 0.028, which represents the dry air opacity, was about five to ten times larger than expected. Most of this discrepancy between the observed and the predicted dry air opacity can be accounted for by including contributions from continuum emission from N2 and O2 as is done in Liebe's MPM atmospheric model.
引用
收藏
页码:907 / 920
页数:14
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