Zonal‐mean global teleconnection from 15 to 110 km derived from SABER and WACCM

Tan, Bi-Hua; Chu, Xinzhao; Liu, Hanli; Yamashita, Chihoko; Russell, James M.

doi:10.1029/2011jd016750

Cited by 32 publications

(56 citation statements)

References 28 publications

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“…It increases by ∼ 30 and ∼ 50 m s −1 in the mesopause region in the weak and strong SSW events, respectively. Generally, the SSW features in our simulations (e.g., the increasing temperature and decreasing westerly in the winter stratospheric high-latitude region) agree with previous reports (Funke et al, 2010;Yamashita et al, 2010;Tan et al, 2012). Figure 5a shows the wave-number-period spectrum of the meridional wind during days 25-30 of case 1.…”

Section: Zonal Mean Background Conditionsupporting

confidence: 79%

“…Rapid growth of QSPWs and their forcing is believed to be the main driver of the sudden stratospheric warming (SSW) at high latitudes in the winter hemisphere (Matsuno, 1971), which causes inter-hemispheric connections at different altitudes (e.g., Karlsson et al, 2007Karlsson et al, , 2009Tan et al, 2012). The wave-mean flow interactions could decelerate or even reverse the eastward winter stratospheric jet, which, in return, prevents the further growth of the QSPW.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the sudden stratospheric warming on quasi-2-day waves

Liu

Dou

et al. 2016

Atmos. Chem. Phys.

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Abstract. The influence of the sudden stratospheric warming (SSW) on a quasi-2-day wave (QTDW) with westward zonal wave number 3 (W3) is investigated using the Thermosphere-Ionosphere-Mesosphere Electrodynamics General Circulation Model (TIME-GCM). The summer easterly jet below 90 km is strengthened during an SSW, which results in a larger refractive index and thus more favorable conditions for the propagation of W3. In the winter hemisphere, the Eliassen-Palm (EP) flux diagnostics indicate that the strong instabilities at middle and high latitudes in the mesopause region are important for the amplification of W3, which is weakened during SSW periods due to the deceleration or even reversal of the winter westerly winds. Nonlinear interactions between the W3 and the wave number 1 stationary planetary wave produce QTDW with westward zonal wave number 2 (W2). The meridional wind perturbations of the W2 peak in the equatorial region, while the zonal wind and temperature components maximize at middle latitudes. The EP flux diagnostics indicate that the W2 is capable of propagating upward in both winter and summer hemispheres, whereas the propagation of W3 is mostly confined to the summer hemisphere. This characteristic is likely due to the fact that the phase speed of W2 is larger, and therefore its waveguide has a broader latitudinal extension. The larger phase speed also makes W2 less vulnerable to dissipation and critical layer filtering by the background wind when propagating upward.

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Section: Zonal Mean Background Conditionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Influence of the sudden stratospheric warming on quasi-2-day waves

Liu

Dou

et al. 2016

Atmos. Chem. Phys.

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“…Liu and Roble 2002;Tan et al 2012;Yiğit and Medvedev 2012;Yuan et al 2012;Miyoshi et al 2015). The SSW impact can also extend into the summer mesosphere and mesopause region, as evidenced in observations and numerical simulations, through inter-hemispheric coupling (Becker and Fritts 2006;Karlsson et al 2007Karlsson et al , 2009aKörnich and Becker 2010;Tan et al 2012;Miyoshi et al 2015). Numerical simulations by Liu et al (2013Liu et al ( , 2014a and Miyoshi et al (2015) suggest that the SSW impact may extend into the upper thermosphere, though observations of thermospheric responses to SSW are less conclusive (Liu et al 2011;Fuller-Rowell et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The slowdown and reversal of winter stratospheric wind changes the gravity wave (GW) propagation condition, which in turn changes the circulation in the upper atmosphere (e.g. Liu and Roble 2002;Tan et al 2012;Yiğit and Medvedev 2012;Yuan et al 2012;Miyoshi et al 2015). The SSW impact can also extend into the summer mesosphere and mesopause region, as evidenced in observations and numerical simulations, through inter-hemispheric coupling (Becker and Fritts 2006;Karlsson et al 2007Karlsson et al , 2009aKörnich and Becker 2010;Tan et al 2012;Miyoshi et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Gravity Wave Variation from the Troposphere to the Lower Thermosphere during a Stratospheric Sudden Warming Event: A Case Study

Liu

2017

SOLA

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High resolution Whole Atmosphere Community Climate Model (WACCM) simulations are used to study how gravity waves vary during a stratospheric sudden warming (SSW) event from the source region to the lower thermosphere. The variation of zonal mean momentum flux of resolved gravity waves (with zonal wavelengths less than 1600 km) during SSW are qualitatively consistent with those obtained from parameterized studies, mainly caused by the change of filtering by the mean zonal wind. At high latitude in the winter hemisphere, stratospheric and mesospheric momentum fluxes vary rapidly during SSW, and their magnitudes decrease significantly following SSW, agreeing with satellite observations. Gravity waves are also found to vary as wave sources change. At tropical regions (especially in the summer hemisphere), convectively generated gravity waves increase due to enhanced deep convection following SSW. At higher latitudes, orographic waves vary during SSW as the wind changes extend from the stratosphere down into the troposphere. Gravity waves generated from adjustment of the polar jet also undergo significant changes during SSW. These changes lead to strong longitudinal variation of gravity waves.(Citation: Liu, H.-L, 2017: Gravity wave variation from the troposphere to the lower thermosphere during a stratospheric sudden warming event: A case study. SOLA, 13A, 24−30,

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“…The pattern was then found in observational data (e.g. Karlsson et al, 2007;Gumbel and Karlsson, 2011;Espy et al, 2011;De Wit et al, 2016), in the Whole Atmosphere Community Climate Model (WACCM; Sassi et al, 2004;Tan et al, 2012), in the Canadian Middle Atmosphere Model (CMAM; Karlsson et al 2009), and in the highaltitude analysis from the Navy Operational Global Atmospheric Prediction System -Advanced Level Physics High Altitude (NOGAPS-ALPHA) forecast/assimilating system (Siskind et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

The role of the winter residual circulation in the summer mesopause regions in WACCM

Kuilman

Karlsson

2018

Atmos. Chem. Phys.

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Abstract. High winter planetary wave activity warms the summer polar mesopause via a link between the two hemispheres. Complex wave-mean-flow interactions take place on a global scale, involving sharpening and weakening of the summer zonal flow. Changes in the wind shear occasionally generate flow instabilities. Additionally, an altering zonal wind modifies the breaking of vertically propagating gravity waves. A crucial component for changes in the summer zonal flow is the equatorial temperature, as it modifies latitudinal gradients. Since several mechanisms drive variability in the summer zonal flow, it can be hard to distinguish which one is dominant. In the mechanism coined interhemispheric coupling, the mesospheric zonal flow is suggested to be a key player for how the summer polar mesosphere responds to planetary wave activity in the winter hemisphere. We here use the Whole Atmosphere Community Climate Model (WACCM) to investigate the role of the summer stratosphere in shaping the conditions of the summer polar mesosphere. Using composite analyses, we show that in the absence of an anomalous summer mesospheric temperature gradient between the equator and the polar region, weak planetary wave forcing in the winter would lead to a warming of the summer mesosphere region instead of a cooling, and vice versa. This is opposing the temperature signal of the interhemispheric coupling that takes place in the mesosphere, in which a cold and calm winter stratosphere goes together with a cold summer mesopause. We hereby strengthen the evidence that the variability in the summer mesopause region is mainly driven by changes in the summer mesosphere rather than in the summer stratosphere.

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Zonal‐mean global teleconnection from 15 to 110 km derived from SABER and WACCM

Cited by 32 publications

References 28 publications

Influence of the sudden stratospheric warming on quasi-2-day waves

Influence of the sudden stratospheric warming on quasi-2-day waves

Gravity Wave Variation from the Troposphere to the Lower Thermosphere during a Stratospheric Sudden Warming Event: A Case Study

The role of the winter residual circulation in the summer mesopause regions in WACCM

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