STRATOSPHERIC HCL, HF, AND N_2O IN ANTARCTICA OBSERVED WITH SOLAR INFRARED ABSORPTION METHOD
スポンサーリンク
概要
- 論文の詳細を見る
Vertical column densities of HCl, HF, and N_2O were observed using solar infrared absorption technique at Syowa Station (69.006°S, 39.590°E), to study the chemistry and dynamics of Antarctic ozone depletion. The solar spectra were taken by using a 1.5m double-pass grating monochromator with wavenumber resolution of 0.075(cm)^<-1>-0.137(cm)^<-1>, and the measurements were carried out from July to December 1991. HCl vertical column densities were observed to be (1.65±0.43)×(10)^<15>(cm)^<-2> in winter and to increase to (6.07±1.20)×(10)^<15>(cm)^<-2> in summer. HF and N_2O vertical column densities remained fairly constant at (1.31±0.25)×(10)^<15>(cm)^<-2> and (5.98±0.31)×(10)^<18>(cm)^<-2>, respectively from July to December, suggesting stable dynamical conditions. The temporal variation of the HF/HCl vertical column density ratios shows that only HCl was removed by chemical reactions during polar night. These reactions might occur on the surfaces of the polar stratospheric cloud (PSC) particles in the altitude region between 12km and 25km. The decrease in HCl vertical column density ((4.4±1.6)×(10)^<15>(cm)^<-2>) during polar night implies that almost all HCl molecules in this altitude region were converted into other chlorine species and/or trapped in the PSC particles. Total ozone measured with a Dobson spectrophotometer shows that Syowa Station was located in the 'ozone hole' in mid-November, whereas the HCl vertical column density had recovered to the summer level at that time. Atmospheric temperature and wind measured with radiosondes over Syowa Station show that the air mass in the 'ozone hole' remained dynamically stable in August and September. The increase in HCl vertical column density from September to November is thought to be mainly due to chemical reactions. Comparing the observational result with a one-dimensional time-dependent photochemical model calculation, it is found that half of the decreased amount of HCl vertical column density was converted into active chlorine and that the remainder was converted into other less active chlorine species and/or trapped in the PSC particles. To describe the temporal variation of partitioning among chlorine species in detail, we must observe HCl, ClONO_2,and ClO simultaneously for a longer observation period, at least one year. We should also observe other chlorine species and nitrogen species.
著者
-
Iwagami Naomoto
Department Of Earth And Planetary Physics Graduate School Of Science University Of Tokyo
-
Murata Isao
Department Of Earth And Planetary Physics Graduate School Of Science University Of Tokyo
-
Ogawa Toshihiro
Department Of Earth And Planetary Physics Graduate School Of Science University Of Tokyo
-
KITA Kazuyuki
Department of Earth and Planetary Physics, Graduate School of Science, University of Tokyo
-
Kita Kazuyuki
Department Of Earth And Planetary Physics Graduate School Of Science University Of Tokyo
-
Ogawa Toshihiro
Department Of Earth And Planetary Physics Faculty Of Science University Of Tokyo
関連論文
- Observations of the lower thermospheric neutral temperature and density in the DELTA campaign
- Ballon-borne resonance fluorescence instrument for in-situ measurement of atomic oxygen: Simultaneous measurement with ozone at 38-44km
- Observational experiment of the Antarctic ozone hole of 1991 under the Polar Patrol Baloon (PPB) Project: (2) A preliminary result of ozone and aerosol observation (abstract)
- Benchmark Experiment on Vanadium with D-T Neutrons and Validation of Evaluated Nuclear Data Libraries by Analysis of the Experiment
- Preliminary results of rocket attitude and auroral green line emission rate in the DELTA campaign
- UPPER ATMOSPHERE PHYSICS (UAP) DATA OBTAINED AT SYOWA AND ASUKA STATIONS IN 1991
- Assessment of Tritium Behavior in Man Using a Modified Three-Compartment Model
- STRATOSPHERIC HCL, HF, AND N_2O IN ANTARCTICA OBSERVED WITH SOLAR INFRARED ABSORPTION METHOD
- INFRARED ABSORPTION MEASUREMENT OF HCl, HF, AND N_2O AT SYOWA STATION
- Polar thermosphere-stratosphere photochemical coupling experiment : Two rocket measurements in polar winter at 69°N
- Infrared and UV-visible absorption measurement at Syowa Station (abstract)
- INFRARED SPECTROSCOPIC MEASUREMENT AT SYOWA STATION
- Atmospheric Temperature and Wind Profiles Measured by MT-135 Rocket Datasonde during the DYANA Campaign
- New Sampling Method in Continuous Energy Monte Carlo Calculation for Pebble Bed Reactors
- Contrast sources for the infrared images taken by the Venus mission AKATSUKI
- Series of observations of atmospheric methane aboard the icebreaker SHIRASE (abstract)
- Evaluation of ozone column amount from the solar backscattering spectra measured with a spectrograph onboard an aircraft
- LIR : Longwave Infrared Camera onboard the Venus orbiter Akatsuki
- Science requirements and description of the 1μm camera onboard the Akatsuki Venus Orbiter
- Evaluation of Hot Spot Factors for Thermal and Hydraulic Design of HTTR.