Sources of concentric gravity waves generated by a moving mesoscale convective system in southern Brazil
-
Published:2022-11-29
Issue:23
Volume:22
Page:15153-15177
-
ISSN:1680-7324
-
Container-title:Atmospheric Chemistry and Physics
-
language:en
-
Short-container-title:Atmos. Chem. Phys.
Author:
Nyassor Prosper K.ORCID, Wrasse Cristiano M., Paulino IgoORCID, São Sabbas Eliah F. M. T., Bageston José V., Naccarato Kleber P.ORCID, Gobbi Delano, Figueiredo Cosme A. O. B.ORCID, Ayorinde Toyese T., Takahashi Hisao, Barros Diego
Abstract
Abstract. The studies on the sources of three concentric gravity waves (CGWs) excited by a moving mesoscale convective system (MCS) on the night of 1–2 October 2019 are investigated. These CGWs were observed using a hydroxyl (OH) all-sky imager, whereas the MCS was observed by the Geostationary Operational Environmental Satellite (GOES). Using 2D spectral analysis, we observed that the three CGWs have horizontal wavelength λH between ∼30–55 km, phase speed cH∼70–90 m s−1, and period τ∼7–12 min. Using backward ray tracing, we found that two of the CGWs were excited from convective cores within the MCS. We also found that the epicenters of the two waves were close to the tropopause positions of the ray-traced paths and nearby convective cores. Regarding the source, we verified that on this night the tropopause was ∼-80 ∘C, which was ∼10 ∘C colder
than the days preceding and after the MCS and also colder than usually observed. Since the tropopause height and temperature are fundamental parameters underlying the analysis of the overshooting extent, we developed our own methodology to establish a reference tropopause that would enable a quantitative estimate of this parameter. Since the MCS (CGWs source) was moving, the overshooting convective cores were tracked in space and time. Using the tracking of the overshooting tops (OTs) in space and time with the aid of reverse ray tracing, we found that two out of the three CGWs were excited by the MCS, whereas the source of the remaining one was not directly associated with the MCS.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference64 articles.
1. Adler, R. F. and Fenn, D. D.: Thunderstorm intensity as determined from
satellite data, J. Appl. Meteorol. Clim., 18, 502–517,
https://doi.org/10.1175/1520-0450(1979)018<0502:TIADFS>2.0.CO;2, 1979. a 2. Azeem, I., Yue, J., Hoffmann, L., Miller, S. D., Straka, W. C., and Crowley,
G.: Multisensor profiling of a concentric gravity wave event propagating from
the troposphere to the ionosphere, Geophys. Res. Lett., 42, 7874–7880, https://doi.org/10.1002/2015GL065903, 2015. a 3. Bedka, K., Brunner, J., Dworak, R., Feltz, W., Otkin, J., and Greenwald, T.:
Objective satellite-based detection of overshooting tops using infrared
window channel brightness temperature gradients, J. Appl. Meteorol. Clim., 49, 181–202, https://doi.org/10.1175/2009JAMC2286.1, 2010. a, b, c 4. Bevington, P. R. and Robinson, D. K.: Data reduction and error analysis for
the physical sciences, in: 3rd Edn., McGraw-Hill, New York, NY,
https://cds.cern.ch/record/1305448 (last access: 16 November 2022), 2003. a 5. Choi, H.-J., Chun, H.-Y., and Song, I.-S.: Gravity wave temperature variance
calculated using the ray-based spectral parameterization of convective
gravity waves and its comparison with Microwave Limb Sounder observations,
J. Geophys. Res.-Atmos., 114, D08111, https://doi.org/10.1029/2008JD011330, 2009. a, b
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|