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A study on polar atmospheric tide by EISCAT and other radars and numerical modellings

EISCAT 和其他雷达及数值模拟对极地大气潮的研究

基本信息

批准号：
14340146
负责人：
ASO Takehiko
金额：
$ 6.02万
依托单位：
NATIONAL INSTITUTE OF POLAR RESEARCH
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Through studies on polar atmospheric tide at MLT regions by EISCAT and other arctic and also Antarctic radars and modelings, it is found that altitude profiles of EISCAT, SSR and meteor radar tide are by and large contiguous or consistent in various respects, that climatology of tides are clarified in which, e.g., latitudinal comparison of diurnal component between Tromso and Svalbard is compatible with high-latitude (1,-2) mode and observed spectra around semidiurnal component are consistent with GCM, that zonal study between Tromso and Poker Flat suggests summertime non-migrating semidiurnal mode is not quite obvious as compared with Antarctic, consistent with modeled process and observed north-south asymmetry in stratospheric planetary wave activity, that short period 6 and 8 hr tide and gravity wave are extracted to open a scope for comparative study with numerical models, that GCM model tells us both diurnal and semidiurnal non-migrating tides are relevant with stationary planetary wave at lower heights and also gravity wave happens to enhance or weaken diurnal tide, that linearized, steady model passably delineates terdiurnal and non-migrating signatures, while even most advanced WACCM model remains to fully interpret details of observed seasonal tidal climatology.

通过对EISCAT和其他北极、南极雷达及模式在MLT地区的极地大气潮汐研究，发现EISCAT、SSR和流星雷达潮汐的高度剖面在各方面基本上是连续或一致的，从而阐明了潮汐的气候学，如：特罗姆瑟和斯瓦尔巴特群岛周日分量纬向比较与高纬（1，-2）模态一致，半日分量附近观测谱与GCM一致，特罗姆瑟和扑克平原的纬向研究表明，夏季非迁移的半日模态与南极相比不太明显，这与模拟过程和观测到的平流层行星波活动的南北不对称性相一致，提取了短周期6小时和8小时潮汐和重力波，为数值模式对比研究开辟了空间，GCM模式告诉我们，周日和半日非迁移潮汐与低层定常行星波有关，重力波也会增强或减弱周日潮汐，线性定常模式较好地刻画了周日和非迁移特征，然而，即使是最先进的WACCM模式仍然无法完全解释观测到的季节性潮汐气候的细节。