期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 126, 期 4, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JD034073
关键词
gravity waves; remote sensing; sudden stratospheric warming
资金
- National Research Foundation of Korea (NRF) - South Korea government (MSIT) [2017R1A2B2008025]
- National Research Foundation of Korea [2017R1A2B2008025] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigated the role of stratospheric gravity waves (GWs) in the Northern Hemisphere during the sudden stratospheric warming (SSW) event of 2009. Analysis of NASA satellite instrument data showed prominent GW activity in Labrador Peninsula and southern Greenland prior to the onset of the warming event. Planetary waves peaked in amplitude between mid-January and January 24.
A major sudden stratospheric warming event occurred on January 24, 2009 and showed a unique and pronounced planetary wave 2 amplitude with a subsequent split in the polar vortex. While research about the role of planetary waves during sudden stratospheric warming events exists, the contribution of gravity waves (GWs) is still uncertain. We therefore investigated the role of stratospheric GWs in the Northern Hemisphere during the 2009 winter season. We use observational data from NASA's Atmospheric Infrared Sounder (AIRS) satellite instrument for our analysis. Variances in the 4.3 mu m brightness temperature perturbations are analyzed together with Level 3 temperature retrievals to investigate the connection between GWs and the warming event. Our planetary wave analysis shows zonal wavenumber 1 amplitudes during December 2008 and early January 2009. However, zonal wavenumber 2 is more dominant between mid-January and January 24, 2009. We also found a decrease in Northern hemisphere GW activity a few days before the maximum warming and the wind reversal occur at 30 hPa altitude. Furthermore, prominent GW activity was found at Labrador Peninsula and southern Greenland, both are locations of elevated GW activity (hotspots), until mid-January 2009. We discuss the potential of these orographic GWs to amplify planetary waves during the onset of the sudden stratospheric warming (SSW) event.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据