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Development of a balloonborne radiosonde to measure extremely low mixing ratios of nitric oxide in the atmosphere up to the altitude of 40 km first measured and stratospheric vertical profiles

Abstract

Vertical profiles of NO were measured at midlatitudes by means of a balloonborne payload using the chemiluminescent principle. A newly developed pressure dependent turbofan enables sufficient main flow even under near vacuum conditions, as low as 3 mb a flight duration of 20 hours. The data are continuously transmitted via a PCM-system to the ground station. The whole instrument was sealed prior to the flight and opened above the clouds by telecommand in order to avoid contamination by water vapour. Extensive laboratory and in situ calibration procedures led for the first time to overall errors of less than +-5% for the midday mean value between 3 to 10 mb and +- 25% at 150 mb. The resolving power is better than 20 pptsub(v) (10/sup -11/) depending on the actual temperature, maniflow, and pressure. At about 25 mb, the reduction in NO with the setting of the sun was observed. A very slow decrease in the mixing ratio was found, which agrees with measurements of other workers but not with present model predictions. The mixing ratio between 7 and 10 mb was between 3 and 4 ppbsub(v) (10/sup -9/). The minimum mixing ratio of about 0.07 ppbsub(v) was observed at about  More>>
Authors:
Publication Date:
Jan 01, 1979
Product Type:
Book
Reference Number:
EDB-82-022475
Resource Relation:
Other Information: Thesis
Subject:
54 ENVIRONMENTAL SCIENCES; EARTH ATMOSPHERE; AERIAL MONITORING; NITROGEN OXIDES; STRATOSPHERE; AEROSOL MONITORING; ATMOSPHERIC EXPLOSIONS; BALLOONS; CHEMILUMINESCENCE; MEASURING INSTRUMENTS; NUCLEAR EXPLOSIONS; OZONE LAYER; PROBES; QUANTITY RATIO; AIRSHIPS; CHALCOGENIDES; EXPLOSIONS; LAYERS; LUMINESCENCE; MONITORING; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)
OSTI ID:
6000128
Country of Origin:
Germany
Language:
German
Submitting Site:
DE
Size:
Pages: 135
Announcement Date:

Citation Formats

Weiler, K H. Development of a balloonborne radiosonde to measure extremely low mixing ratios of nitric oxide in the atmosphere up to the altitude of 40 km first measured and stratospheric vertical profiles. Germany: N. p., 1979. Web.
Weiler, K H. Development of a balloonborne radiosonde to measure extremely low mixing ratios of nitric oxide in the atmosphere up to the altitude of 40 km first measured and stratospheric vertical profiles. Germany.
Weiler, K H. 1979. "Development of a balloonborne radiosonde to measure extremely low mixing ratios of nitric oxide in the atmosphere up to the altitude of 40 km first measured and stratospheric vertical profiles." Germany.
@misc{etde_6000128,
title = {Development of a balloonborne radiosonde to measure extremely low mixing ratios of nitric oxide in the atmosphere up to the altitude of 40 km first measured and stratospheric vertical profiles}
author = {Weiler, K H}
abstractNote = {Vertical profiles of NO were measured at midlatitudes by means of a balloonborne payload using the chemiluminescent principle. A newly developed pressure dependent turbofan enables sufficient main flow even under near vacuum conditions, as low as 3 mb a flight duration of 20 hours. The data are continuously transmitted via a PCM-system to the ground station. The whole instrument was sealed prior to the flight and opened above the clouds by telecommand in order to avoid contamination by water vapour. Extensive laboratory and in situ calibration procedures led for the first time to overall errors of less than +-5% for the midday mean value between 3 to 10 mb and +- 25% at 150 mb. The resolving power is better than 20 pptsub(v) (10/sup -11/) depending on the actual temperature, maniflow, and pressure. At about 25 mb, the reduction in NO with the setting of the sun was observed. A very slow decrease in the mixing ratio was found, which agrees with measurements of other workers but not with present model predictions. The mixing ratio between 7 and 10 mb was between 3 and 4 ppbsub(v) (10/sup -9/). The minimum mixing ratio of about 0.07 ppbsub(v) was observed at about 60 mb. Also a hysteresis between ascent and descent was observed. It is concluded that the different diurnal variations of NO are strongly dependent on vertical exchange processes, scattering processes, and the surface albedo.}
place = {Germany}
year = {1979}
month = {Jan}
}