平流层爆发性增温事件中大气准16日行星波的研究

Subjects: Geosciences >> Space Physics submitted time 2017-01-22

朱露 姜国英 徐寄遥陈金松 胡连欢 宁百齐

Abstract： A minor sudden stratospheric warming(SSW) event occurred in the early and middle January of 2014. The amplitude of increasing temperature was about 25K , the zonal eastward wind became weaker and shifted its direction until the early February. The planetary waves (PWs) are believed to have significant role in SSW events. So using the wind data detected by 5 meteor radars at low and middle latitude of northern hemisphere near 120 , we studied the PWs during this minor SSW event. Results show that the enhanced quasi 16-day PWs can be found at mesosphere and lower thermosphere (MLT) region. The enhancement of quasi 16-day waves were prior to the warming, and the quasi 16-day PWs had mostly the strongest amplitude when the polar temperature reach its peak. This demonstrates the coupling between low and middle latitude MLT region and SSW. Furthermore, we used the reanalysis data from the European Centre for Medium-range Weather Forecasts (ECMWF) to investigate the wave coupling between stratosphere and mesosphere. The band pass filter of the stratospheric temperature shows that quasi 16-day PWs propagated period lower latitude to the pole, meanwhile the zero-wind line moved from low latitude to high latitude, indicating a dynamical connection between the 16-day PWs and SSW.

Peer Review Status:Awaiting Review

 Hits 2679  Downloads 1595  Comment 0