A Global Distribution of the Stratospheric Gravity Wave Activity from GPS Occultation Profiles with SAC-C and CHAMP (2.Space-Borne GPS Meteorology and Related Techniques)
スポンサーリンク
概要
- 論文の詳細を見る
We have analysed the gravity wave activity using temperature profiles retrieved from the GPS occultation experiments on board the SAC-C and CHAMP satellites. By dividing the latitude and longitude ranges, here considered in individual cells, the variability of wave energy as a function of altitude observed in both hemispheres during October, November and December 2001 is presented. Some features were repeatedly observed during the three months. Nevertheless, as most available occultations were occurred during November, we begin showing results from this month. Significant differences detected during October are only pointed out at midlatitudes, provided that sufficient number of occultations are available. A significantly larger wave activity at 40-60°N with respect to 40-60°S is detected during this month. Differences between both the hemispheres are discussed and compared with previous results. Wave activity enhancements at equatorial regions above Brazil, Indonesia and India are found to be correlated with outgoing longwave radiation data. Vertical fluctuations with lengths above and below 3.5 km are considered separately, in order to identify the contribution of Kelvin and Rossby-gravity waves. In both cases, for long and short fluctuations and at the upper troposphere as well as at the lower stratosphere, there is a height interval of several kilometers where a systematic enhanced wave activity is observed. Its average height is progressively decreasing with increasing latitude, same as the height variation in the tropopause location. Longitudinal enhancements are also detected mainly around the equator and at midlatitudes. A clear signature is observed locally in the Southern Hemisphere (SH) at midlatitudes and 70-65°W, for vertical wavelengths longer than 3.5 km. It corresponds to mountain waves forced by the Andes Range, observed whenever occultations are available in this cell.
- 社団法人日本気象学会の論文
- 2004-03-25
著者
-
Torre A.
Radio Science Center For Space And Atmosphere Kyoto University:departamento De Fisica Universidad De
-
TSUDA T.
Radio Atmospheric Science Center, Kyoto University
-
HAJJ G.A.
Jet Propulsion Laboratory, California Institute of Technology
-
WICKERT J.
GeoForschungsZentrum, Section Geodesy and Remote Sensing
-
Hajj G.a.
Jet Propulsion Laboratory California Institute Of Technology
-
Wickert J.
Geoforschungszentrum Section Geodesy And Remote Sensing
-
de la
Radio Science Center for Space and Atmosphere, Kyoto University
-
Hajj G.
Jet Propulsion Laboratory, California Institute of Technology
関連論文
- Longitudinal variations in planetary wave activity in the equatorial mesosphere
- Cooperative wind observation in the upper mesosphere and lower thermosphere wth foil chaff technique, the MU radar, and Yamagawa MF radar
- Rocketsonde Observations of the Middle Atmosphere Dynamics at Uchinoura (31゜N, 131゜E) during the DYANA Campaign Part II: Characteristics of Gravity Waves
- Rocketsonde Observations of the Middle Atmosphere Dynamics at Uchinoura(31゜N, 131゜E)during the DYANA Campaign Part I: Outline of Experiments and Background Condisions
- Inversion Algorithms for GPS Downward Looking Occultation Data : Simulation Analysis (2.Space-Borne GPS Meteorology and Related Techniques)
- Atmospheric density and pressure inferred from the meteor diffusion coefficient and airglow O_2b temperature in the MLT region
- Development of Optical Mesosphere Thermosphere Imagers (OMTI)
- Response of the airglow OH emission, temperature and mesopause wind to the atmospheric wave propagation over Shigaraki, Japan
- A study of spatial water vapor distributions by using one-way residuals of GPS phase measurements
- High time resolution measurements of precipitable water vapor from propagation delay of GPS satellite signals
- Seasonal variations of gravity wave structures in OH airglow with a CCD imager at Shigaraki
- Simultaneous measurements of dynamical structure in the mesopause region with lidars and MU radar
- Tropical Sea-breeze Circulation under Varying Background Wind : 920 MHz Wind Profiler Observations at Darwin
- MU radar observations of tropopause variations by using clear air echo characteristics
- A Global Distribution of the Stratospheric Gravity Wave Activity from GPS Occultation Profiles with SAC-C and CHAMP (2.Space-Borne GPS Meteorology and Related Techniques)
- Longitudinal variations in planetary wave activity in the equatorial mesosphere