scholarly journals Horizontal variations of gravity wave activities in the lower stratosphere over Japan: A case study in the Baiu season 1991

1999 ◽  
Vol 51 (2) ◽  
pp. 107-113 ◽  
Author(s):  
Shin-Ya Ogino ◽  
Manabu D. Yamanaka ◽  
Yoshiaki Shibagaki ◽  
Toyoshi Shimomai ◽  
Shoichiro Fukao
Keyword(s):  
Gravity Wave ◽  
Lower Stratosphere ◽  
Horizontal Variations

scholarly journals Mixing Layer Formation near the Tropopause Due to Gravity Wave–Critical Level Interactions in a Cloud-Resolving Model

2004 ◽  
Vol 61 (24) ◽  
pp. 3112-3124 ◽  
Author(s):  
Mohamed Moustaoui ◽  
Binson Joseph ◽  
Hector Teitelbaum
Keyword(s):  
Gravity Wave ◽  
Lower Stratosphere ◽  
Critical Level ◽  
Mixing Layer ◽  
Mixing Layers ◽  
Upper Troposphere ◽  
Cloud Resolving Model ◽  
Tropopause Region ◽  
Plausible Mechanism

Abstract A plausible mechanism for the formation of mixing layers in the lower stratosphere above regions of tropical convection is demonstrated numerically using high-resolution, two-dimensional (2D), anelastic, nonlinear, cloud-resolving simulations. One noteworthy point is that the mixing layer simulated in this study is free of anvil clouds and well above the cloud anvil top located in the upper troposphere. Hence, the present mechanism is complementary to the well-known process by which overshooting cloud turrets causes mixing within stratospheric anvil clouds. The paper is organized as a case study verifying the proposed mechanism using atmospheric soundings obtained during the Central Equatorial Pacific Experiment (CEPEX), when several such mixing layers, devoid of anvil clouds, had been observed. The basic dynamical ingredient of the present mechanism is (quasi stationary) gravity wave–critical level interactions, occurring in association with a reversal of stratospheric westerlies to easterlies below the tropopause region. The robustness of the results is shown through simulations at different resolutions. The insensitivity of the qualitative results to the details of the subgrid scheme is also evinced through further simulations with and without subgrid mixing terms. From Lagrangian reconstruction of (passive) ozone fields, it is shown that the mixing layer is formed kinematically through advection by the resolved-scale (nonlinear) velocity field.

scholarly journals A Case Study of Mass Transport during the East-West Oscillation of the Asian Summer Monsoon Anticyclone

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Jiali Luo ◽  
Jiayao Song ◽  
Hongying Tian ◽  
Lei Liu ◽  
Xinlei Liang
Keyword(s):  
Lower Stratosphere ◽  
Asian Summer Monsoon ◽  
Chemical Transport ◽  
Upward Motion ◽  
High Concentration ◽  
Upper Troposphere ◽  
Asian Summer ◽  
Mode Tm ◽  
East West

We use ERA-Interim reanalysis, MLS observations, and a trajectory model to examine the chemical transport and tracers distribution in the Upper Troposphere and Lower Stratosphere (UTLS) associated with an east-west oscillation case of the anticyclone in 2016. The results show that the spatial distribution of water vapor (H2O) was more consistent with the location of the anticyclone than carbon monoxide (CO) at 100 hPa, and an independent relative high concentration center was only found in H2O field. At 215 hPa, although the anticyclone center also migrated from the Tibetan Mode (TM) to the Iranian Mode (IM), the relative high concentration centers of both tracers were always colocated with regions where upward motion was strong in the UTLS. When the anticyclone migrated from the TM, air within the anticyclone over Tibetan Plateau may transport both westward and eastward but was always within the UTLS. The relative high concentration of tropospheric tracers within the anticyclone in the IM was from the east and transported by the westward propagation of the anticyclone rather than being lifted from surface directly. Air within the relative high geopotential height centers over Western Pacific was partly from the main anticyclone and partly from lower levels.

scholarly journals Gravity-wave effects on tracer gases and stratospheric aerosol concentrations during the 2013 ChArMEx campaign

2016 ◽  
Author(s):  
Fabrice Chane Ming ◽  
Damien Vignelles ◽  
Fabrice Jegou ◽  
Gwenael Berthet ◽  
Jean-Batiste Renard ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Lower Stratosphere ◽  
Weather Forecasting ◽  
Stratospheric Aerosol ◽  
Thin Layers ◽  
Vertical Wind ◽  
Specific Humidity ◽  
Small Scale ◽  
Strong Activity ◽  
Dynamical Parameters

Abstract. Coupled balloon-borne observations of Light Optical Aerosol Counter (LOAC), M10 meteorological global positioning system (GPS) sondes, ozonesondes and GPS radio occultation data, are examined to identify gravity-wave (GW) induced fluctuations on tracer gases and on the vertical distribution of stratospheric aerosol concentrations during the 2013 ChArMEx (Chemistry-Aerosol Mediterranean Experiment) campaign. Observations reveal signatures of GWs with short vertical wavelengths less than 4 km in dynamical parameters and tracer constituents which are also correlated with the presence of thin layers of strong local enhancements of aerosol concentrations in the upper troposphere and the lower stratosphere. In particular, this is evident from a case study above Ile du Levant (43.02 °N, 6.46 °E) on 26–29 July 2013. Observations show a strong activity of dominant mesoscale inertia GWs with horizontal and vertical wavelengths of 370–510 km and 2–3 km respectively, and periods of 10–13 h propagating southward at altitudes of 13–20 km and eastward above 20 km during 27–28 July which is also captured by the European Center for Medium range Weather Forecasting (ECMWF) analyses. Ray-tracing experiments indicate the jet-front system to be the source of observed GWs. Simulated vertical profiles of dynamical parameters with large stratospheric vertical wind maximum oscillations ± 40 mms−1 are produced for the dominant mesoscale GW using the simplified linear GW theory. Parcel advection method reveals signatures of GWs in the ozone mixing ratio and the specific humidity. Simulated vertical wind perturbations of the dominant GW and small-scale perturbations of aerosol concentration (aerosol size of 0.2–0.7 μm) are in phase in the lower stratosphere. Present results support the importance of vertical wind perturbations in the GW-aerosol relation. The observed mesoscale GW induces a strong modulation of the amplitude of tracer gases and the stratospheric aerosol background.

scholarly journals Gravity Wave Behavior in Lower Stratosphere During Tropical Cyclones Over the Bay of Bengal

Radio Science ◽  
2018 ◽  
Vol 53 (11) ◽  
pp. 1356-1367 ◽  
Author(s):  
Gargi Rakshit ◽  
Soumyajyoti Jana ◽  
Animesh Maitra
Keyword(s):  
Gravity Wave ◽  
Tropical Cyclones ◽  
Bay Of Bengal ◽  
Lower Stratosphere

scholarly journals Impact of Global Warming on Gravity Wave Momentum Flux in the Lower Stratosphere

SOLA ◽  
2005 ◽  
Vol 1 ◽  
pp. 189-192 ◽  
Author(s):  
Shingo Watanabe ◽  
Tatsuya Nagashima ◽  
Seita Emori
Keyword(s):  
Global Warming ◽  
Gravity Wave ◽  
Momentum Flux ◽  
Lower Stratosphere ◽  
Wave Momentum

scholarly journals Gravity wave spectra in the lower stratosphere diagnosed from project loon balloon trajectories

2017 ◽  
Vol 122 (16) ◽  
pp. 8517-8524 ◽  
Author(s):  
M. R. Schoeberl ◽  
E. Jensen ◽  
A. Podglajen ◽  
L. Coy ◽  
C. Lodha ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Lower Stratosphere ◽  
Wave Spectra

A case study of A mesoscale gravity wave in the MLT region using simultaneous multi-instruments in Beijing

2016 ◽  
Vol 140 ◽  
pp. 1-9 ◽  
Author(s):  
Mingjiao Jia ◽  
Xianghui Xue ◽  
Xiankang Dou ◽  
Yihuan Tang ◽  
Chao Yu ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Mlt Region
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