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- 저자 : Riggin, Dennis (검색결과 2 건)
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Eswaraiah, S.,Kim, Yong Ha,Hong, Junseok,Kim, Jeong-Han,Ratnam, M. Venkat,Chandran, A.,Rao, S.V.B.,Riggin, Dennis Elsevier 2016 Journal of Atmospheric and Solar-Terrestrial Physi Vol.140 No.-
<P><B>Abstract</B></P> <P>A minor stratospheric sudden warming (SSW) event was noticed in the southern hemisphere (SH) during September (day 259) 2010 along with two episodic warmings in early August (day 212) and late October (day 300) 2010. Among the three warming events, the signature of mesosphere response was detected only for the September event in the mesospheric wind dataset from both meteor radar and MF radar located at King Sejong Station (62°S, 59°W) and Rothera (68°S, 68°W), Antarctica, respectively. The zonal winds in the mesosphere reversed approximately a week before the September SSW event, as has been observed in the 2002 major SSW. Signatures of mesospheric cooling (MC) in association with stratospheric warmings are found in temperatures measured by the Microwave Limb Sounder (MLS). Simulations of specified dynamics version of Whole Atmosphere Community Climate Model (SD-WACCM) are able to reproduce these observed features. The mesospheric wind field was found to differ significantly from that of normal years probably due to enhanced planetary wave (PW) activity before the SSW. From the wavelet analysis of wind data of both stations, we find that strong 14–16 day PWs prevailed prior to the SSW and disappeared suddenly after the SSW in the mesosphere. Our study provides evidence that minor SSWs in SH can result in significant effects on the mesospheric dynamics as in the northern hemisphere.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The mesosphere response to 2010 minor SSW over the Antarctica was observed. </LI> <LI> The mesospheric wind field is found to significantly differ from normal years. </LI> <LI> Mesospheric cooling (MC) in association with SSWs are found. </LI> <LI> 14–16 day planetary waves are noticed in mesosphere before the onset of SSW. </LI> <LI> SD-WACCM simulations are able to reproduce observed MC and wind reversal. </LI> </UL> </P>
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