Rapid Transitions in Zonal Wind Around the Tropical Tropopause and their Relation to the Amplified Equatorial Kelvin Waves
スポンサーリンク
概要
- 論文の詳細を見る
Rapid transitions in the zonal wind (U) around the tropical tropopause within several days are investigated by using the global analysis data and their relation to the amplified Kelvin waves are considered. At 100 hPa, cases with a rapid increase in U (TypeU+ events) are concentrated in the eastern hemisphere, where such cases far outnumber cases that show a rapid decrease in U (TypeU- events). The difference in the number of the two types of events is greatest during the period November-March in the region 90°E-180°E. When only considering cases with a large zonal extent and eastward propagation, the dominance of TypeU+ events in the eastern hemisphere is much more distinct. The asymmetry between the two types is only weakly recorded at lower levels. An amplified and nonlinearly distorted Kelvin wave possibly accounts for predominance of these TypeU+ events at 100hPa. The dominance of TypeU+ events is detected in the basic easterly flow within the upper troposphere, which possibly facilitates the distortion by enhancing the upward propagation of energy and enabling the high intrinsic speed of the wave. In the distorted Kelvin wave, the latitudinal extent of the westerly signal is much smaller than that of the easterly signal.
- 公益社団法人 日本気象学会の論文
公益社団法人 日本気象学会 | 論文
- Low Cloud Modulation by Synoptic Waves over the Eastern Tropical Pacific
- Interdecadal Variability of the Seasonal-scale Persistence in the Tropical Mean Tropospheric Temperature
- Predictability of the Mean Location of Typhoon Formation in a Seasonal Prediction Experiment with a Coupled General Circulation Model
- Comparison of Meisei RS2-91 Rawinsondes and Vaisala RS92-SGP Radiosondes at Tateno for the Data Continuity for Climatic Data Analysis
- Isotopic Variations Associated with North-South Displacement of the Baiu Front