Climatological Westward‐Propagating Semidiurnal Tides and Their Composite Response to Sudden Stratospheric Warmings in SuperDARN and SD‐WACCM‐X

Climatological Westward‐Propagating Semidiurnal Tides and Their Composite Response to Sudden Stratospheric Warmings in SuperDARN and SD‐WACCM‐X
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气候西移 — SuperDARN 和 SD 中半日潮汐的传播及其对平流层突然变暖的综合响应 — WACCM — X

DOI:
10.1029/2020jd032895
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发表时间:
2021
期刊:
Journal of Geophysical Research: Atmospheres
影响因子:
--
通讯作者:
Hibbins, R. E.
Hibbins, R. E.
中科院分区:
--
文献类型:
--
作者:
Zhang, J.;Limpasuvan, V.;Orsolini, Y. J.;Espy, P. J.;Hibbins, R. E.

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使用超级双极光雷达网观测(聚集在60°N附近)和NCAR CESM2.0扩展的全大气社区气候模式,我们研究了与波数1(SW1)和3(SW3)的迁移分量(SW2)和非迁移分量相关的纬向风半日潮的气候学。然后,我们说明了他们的复合响应重大突发平流层变暖(SSW)。除晚秋和春季外,SW2的气候振幅在夏末和冬季达到峰值,超过SW1和SW3。冬季气候峰值在模式中是缺席的,可能是由于纬向风偏置在观测高度。所观察到的SW2振幅在SSW发作后下降,然后沿着SW1和SW3在10天后增强。在观察到的区域内,模拟的SW2仅在SSW发作后放大,SW1和SW3响应最小。该模型揭示了一个更强的SW2响应以上所观察到的位置,与幅度减小之前和增强后SSW全球。这种增强似乎与赤道臭氧加热和背景风对称性增加有关。最强的SW1和SW3生长发生在南半球之前SSW。在SSW期间,SW2和准定常行星波活动在时间上并置,这表明它们的相互作用激发了SW1和SW3。在SSW之后,该模型还揭示了(1)可能由SW 2和向西行扰动之间的相互作用产生的半日潮汐扰动,以及(2)北方半球迁移半日月球潮汐的增强超过了非迁移潮汐和半日潮汐响应。模拟东向传播的半日潮简要检查。
Using the Super Dual Auroral Radar Network observations (clustered around 60°N) and NCAR CESM2.0 extended Whole Atmosphere Community Climate Model nudged with reanalyzes, we examine the climatology of semidiurnal tides in meridional wind associated with the migrating component (SW2) and non‐migrating components of wavenumbers 1 (SW1) and 3 (SW3). We then illustrate their composite response to major sudden stratospheric warmings (SSWs). Peaking in late summer and winter, the climatological SW2 amplitude exceeds SW1 and SW3 except around late Fall and Spring. The winter climatological peak is absent in the model perhaps due to the zonal wind bias at the observed altitudes. The observed SW2 amplitude declines after SSW onset before enhancing ∼10 days later, along with SW1 and SW3. Within the observed region, the simulated SW2 only amplifies after SSW onset, with minimal SW1 and SW3 responses. The model reveals a stronger SW2 response above the observed location, with diminished amplitude before and enhancement after SSW globally. This enhancement appears related to increased equatorial ozone heating and background wind symmetry. The strongest SW1 and SW3 growth occurs in the Southern Hemisphere before SSW. SW2 and quasi‐stationary planetary wave activities are temporally collocated during SSW suggesting that their interactions excite SW1 and SW3. After SSW, the model also reveals (1) semidiurnal‐tide‐like perturbations generated possibly by the interactions between SW2 and westward‐traveling disturbances and (2) the enhancement of migrating semidiurnal lunar tide in the Northern Hemisphere that exceeds non‐migrating tidal and semidiurnal‐tide‐like responses. The simulated eastward‐propagating semidiurnal tides are briefly examined.
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期刊: Journal of Geophysical Research: Atmospheres
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