Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0245.1 |
Dispersion Characteristics and Circulation Associated with Boreal Summer Westward-Traveling Mixed Rossby-Gravity Wave-Like Disturbances | |
Au-Yeung, Andie Y. M.1,2; Tam, Chi-Yung1 | |
2018-02-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:2页码:513-533 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | An algorithm has been developed to track synoptic-scale, westward-traveling mixed Rossby-gravity (MRG) wave-like disturbances with a cross-equatorial component. Applied to space-time-filtered meridional wind data, this algorithm finds locations with Gaussian-shaped wind structures stated in the solutions of shallow-water equations (SWEs). Based on 850-hPa meridional wind from the global National Centers for Environmental Prediction (NCEP) Climate Forecast System Reanalysis (CFSR) dataset, local and instantaneous wave properties including the occurrence time, wavenumber, intrinsic frequency, and magnitude were examined. It was found that these low-level MRG wave-like disturbances can be classified into a longer-wavelength group and a shorter-wavelength group. While most waves identified in the eastern Pacific give longer wavelengths, disturbances in the western Pacific tend to have a wider range of wavenumbers. Composite analysis revealed that east of similar to 140 degrees E, low-level disturbances are characterized by cross-equatorial wind anomalies with alternating signs, thus consistent with the MRG wave solution. West of similar to 140 degrees E, they appear as northeast-southwest-tilted eddies that propagate northwestward. Examination of their energetics suggests that such a tilting structure is favorable to the maintenance of these transients because of the meridional shear of background zonal wind west of similar to 140 degrees E in the off-equatorial Pacific. Farther east, the confluent nature of the low-level background flow plays a dominant role in maintaining the MRG wave-like disturbances because of barotropic conversion. Finally, there is evidence of downward energy dispersion in the mid-to upper levels, suggesting that the upper-level wave activity might be important in triggering these low-level waves in the Pacific basin. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425753300008 |
WOS关键词 | SYNOPTIC-SCALE DISTURBANCES ; COUPLED EQUATORIAL WAVES ; WESTERN NORTH PACIFIC ; SHEARED ZONAL FLOW ; TROPICAL CYCLOGENESIS ; PROPAGATION CHARACTERISTICS ; CLOUD DISTURBANCES ; PART II ; CONVECTION ; OSCILLATIONS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29224 |
专题 | 地球科学 |
作者单位 | 1.Chinese Univ Hong Kong, Earth Syst Sci Programme, Hong Kong, Hong Kong, Peoples R China; 2.City Univ Hong Kong, Sch Energy & Environm, Hong Kong, Hong Kong, Peoples R China |
推荐引用方式 GB/T 7714 | Au-Yeung, Andie Y. M.,Tam, Chi-Yung. Dispersion Characteristics and Circulation Associated with Boreal Summer Westward-Traveling Mixed Rossby-Gravity Wave-Like Disturbances[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(2):513-533. |
APA | Au-Yeung, Andie Y. M.,&Tam, Chi-Yung.(2018).Dispersion Characteristics and Circulation Associated with Boreal Summer Westward-Traveling Mixed Rossby-Gravity Wave-Like Disturbances.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(2),513-533. |
MLA | Au-Yeung, Andie Y. M.,et al."Dispersion Characteristics and Circulation Associated with Boreal Summer Westward-Traveling Mixed Rossby-Gravity Wave-Like Disturbances".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.2(2018):513-533. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论