著者

Yanjie Li

出版者

Meteorological Society of Japan

雑誌

SOLA (ISSN:13496476)

巻号頁・発行日

vol.16, pp.92-96, 2020 (Released:2020-06-04)

参考文献数

43

被引用文献数

1

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The meridional propagation of Rossby waves links different latitudes. Traditional wave propagation theory is mostly discussed in the non-divergent atmosphere. This work emphasizes the influence of the divergent effect on wave propagation by analyzing wave solutions to the linearized shallow-water quasi-geostrophic potential vorticity equation on the zonal mean flow. Changes in the basic-state quantities and wave solutions generated from consideration of the divergent effect are highlighted. Compared with the non-divergent situation, more waves are allowed to exist and propagate to much higher latitudes in the divergent case. The turning latitudes are generally moved northward when the divergent effect is included. This main conclusion is robust in the idealized super-rotational flow and 300 hPa climatological flows in winter and summer. The divergent effect also tends to slow the speed of wave propagation and favor waves reaching remoter longitudes. These finding implicates Rossby wave propagation with divergent effect may contribute more to the long-distance teleconnection than that in non-divergent case.

著者

Yanjie Li Jin Feng Jianping Li Sen Zhao

出版者

Meteorological Society of Japan

雑誌

SOLA (ISSN:13496476)

巻号頁・発行日

vol.14, pp.121-125, 2018 (Released:2018-09-04)

参考文献数

25

被引用文献数

1

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Rossby wave propagation theory is reviewed under two kinds of non-uniform basic flows: the zonal mean (ZM) and horizontally non-uniform (HN) flows in this study. The diagrams in the wavenumber domain for stationary and non-stationary waves embedded in the ZM flow are given and discussed in comparison with previous studies. Then a circle diagram in the group velocity domain for waves embedded in the HN flow is derived from the formulas in forms of three vectors: the wavenumber, background wind and gradient of basic-state absolute velocity. Given the basic state, we can identify the maximum and minimum magnitude of group velocity and its departure from the background wind. These results provide insights into Rossby wave propagation behaviors in the real atmosphere.

著者

Yanjie Li

出版者

Meteorological Society of Japan

雑誌

SOLA (ISSN:13496476)

巻号頁・発行日

pp.2020-016, (Released:2020-04-08)

被引用文献数

1

---

The meridional propagation of Rossby waves links different latitudes. Traditional wave propagation theory is mostly discussed in the non-divergent atmosphere. This work emphasizes the influence of the divergent effect on wave propagation by analyzing wave solutions to the linearized shallow-water quasi-geostrophic potential vorticity equation on the zonal mean flow. Changes in the basic-state quantities and wave solutions generated from consideration of the divergent effect are highlighted. Compared with the non-divergent situation, more waves are allowed to exist and propagate to much higher latitudes in the divergent case. The turning latitudes are generally moved northward when the divergent effect is included. This main conclusion is robust in the idealized super-rotational flow and 300 hPa climatological flows in winter and summer. The divergent effect also tends to slow the speed of wave propagation and favor waves reaching remoter longitudes. These finding implicates Rossby wave propagation with divergent effect may contribute more to the long-distance teleconnection than that in non-divergent case.