A brief of recent research progress on ionospheric disturbances

Xiao, Zuo; Yu, Shanhe; Shi, Honglan; Hao, Yongqiang

doi:10.1007/s11432-013-5042-z

Cited by 5 publications

(1 citation statement)

References 82 publications

(77 reference statements)

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“…When the westward propagating PWs enter the stratosphere of the polar region, they would interact with the westerly mean flow through dissipation or transmission, thus exerting eastward acceleration, which would weaken or even reverse the westerly mean flow. As confirmed by theoretical studies [7,8] that the Gravity Waves (GWs) could also interact with the mean flow, and the stratosphere (above 30 km) is a main dissipation region of GWs in the high latitudes [9], the GWs could also contribute to the change of the mean flow. Meanwhile, SSWs would affect the propagation and the energy distribution of GWs because of the remarkable change of the background atmosphere within a short period of time [10].…”

Section: Introductionmentioning

confidence: 90%

Observations of gravity wave activity during stratospheric sudden warmings in the Northern Hemisphere

Yue

Zhang

et al. 2015

Sci. China Technol. Sci.

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Arctic stratospheric sudden warming (SSW) with polar vortex displacement and splitting occurred in 2008 and 2009, respectively. The temperature profiles derived from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) along with NCEP/NCAR reanalysis are used to investigate the gravity wave (GW) variations during these SSW events. Some phenomena are characterized and possible mechanisms are discussed. The GW variations during both types of SSW events shared some similarities. During the warming events, enhanced zonal mean GW amplitudes are detected. The enhancements of GW amplitudes first appeared at higher altitudes and then progressed downward during the major warming events. The downward progressions correspond well with the height variations of the zonal wind reversal, and the enhancements seem to occur at the same time with the wind reversal. The spatial variations of GWs showed evident correlation to the polar vortex. Generally, GWs were enhanced at the edge of the polar vortex where the background wind was strong, whereas the areas with the largest GW amplitudes did not always correspond with those with the strongest background wind. The differences during the two types of SSW are also noticeable. In the 2008 major event, the magnitudes of the zonal mean GW enhancements during the downward progression were relatively stable, whereas in the 2009 major event, a clear reduction was detected as the GW enhancement was progressing downward. Also, the recovery time of the polar vortex was longer in 2009. These differences indicate that different types of SSWs may have different impacts on the GW. stratospheric sudden warming, gravity wave, COSMIC Citation:Jia Y, Zhang S D, Yi F, et al. Observations of gravity wave activity during stratospheric sudden warmings in the Northern Hemisphere.

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