NDLI: Detection of atmospheric chlorine-compounds with an airborne submillimeter receiver

Content Provider	IEEE Xplore Digital Library
Author	Wehr, T. Crewell, S. Kunzi, K. Urban, J. Nett, H.
Copyright Year	1994
Description	Author affiliation: Inst. of Environ. Phys., Bremen Univ., Germany (Wehr, T.; Crewell, S.; Kunzi, K.; Urban, J.)
Abstract	The distribution of numerous upper atmospheric trace gases involved in the cycles of catalytic ozone depletion can be studied using passive submillimeter wave radiometry. The main intent was to investigate constituents of importance in the chlorine cycle, namely HCl and ClO. The authors instrument is based on all solid-state technology and has been optimized for the detection of thermal emission lines of these molecules. In order to avoid strong tropospheric water vapour absorption the radiometer has to be operated in a high flying aircraft (altitude /spl ges/10 km). The observation of HCl takes place at 625.9 GHz and ClO at 649.4 GHz. Emission spectra were analyzed over an instantaneous bandwidth of 1.2 GHz and a resolution of approx. 1.4 MHz in the line center. This system has been used very successfully in different campaigns. The retrievals of the volume mixing ratio profiles have been performed using the optimal estimation method (OEM). The error analysis shows the significance of model parameter uncertainties. Vertical profiles can be obtained over an altitude range of approx. 12 to 50 km.
Starting Page	1347
Ending Page	1349
File Size	292878
Page Count	3
File Format	PDF
ISBN	0780314972
DOI	10.1109/IGARSS.1994.399436
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-08-08
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Atmospheric waves Submillimeter wave technology Radiometry Gases Submillimeter wave devices Instruments Solid state circuits Electromagnetic wave absorption Aircraft Bandwidth
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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