Articles | Volume 25, issue 19
https://doi.org/10.5194/acp-25-12357-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-12357-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Oct 2025
Research article |
| 08 Oct 2025
| 08 Oct 2025
Modulation of tropical stratospheric gravity wave activity and the ITCZ position by modes of climate variability using radio occultation and reanalysis data
Toyese Tunde Ayorinde
CORRESPONDING AUTHOR
Space Weather Division, National Institute for Space Research (INPE), São José dos Campos, SP, Brazil
Cristiano Max Wrasse
Space Weather Division, National Institute for Space Research (INPE), São José dos Campos, SP, Brazil
Hisao Takahashi
Space Weather Division, National Institute for Space Research (INPE), São José dos Campos, SP, Brazil
Luiz Fernando Sapucci
Instituto Nacional de Pesquisas Espaciais (INPE), Centro de Previsão de Tempo e Estudos Climáticos, Rodovia Presidente Dutra, km 40, Cachoeira Paulista, SP, Brazil
Mohamadou A. Diallo
Institute of Climate and Energy Systems – Stratosphere (ICE-4), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
Cosme Alexandre Oliveira Barros Figueiredo
Unidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil
Diego Barros
Space Weather Division, National Institute for Space Research (INPE), São José dos Campos, SP, Brazil
Ligia Alves da Silva
Space Weather Division, National Institute for Space Research (INPE), São José dos Campos, SP, Brazil
Patrick Essien
Department of Physics, Meteorology and Atmospheric Research Lab, University of Cape Coast, Cape Coast, Ghana
Anderson Vestena Bilibio
Unidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil
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Laysa C. A. Resende, Yajun Zhu, Clezio M. Denardini, Sony S. Chen, Ronan A. J. Chagas, Lígia A. Da Silva, Carolina S. Carmo, Juliano Moro, Diego Barros, Paulo A. B. Nogueira, José P. Marchezi, Giorgio A. S. Picanço, Paulo Jauer, Régia P. Silva, Douglas Silva, José A. Carrasco, Chi Wang, and Zhengkuan Liu
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Igo Paulino, Ana Roberta Paulino, Amauri F. Medeiros, Cristiano M. Wrasse, Ricardo Arlen Buriti, and Hisao Takahashi
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In the present work, the lunar semidiurnal tide (M2) was investigated in the equatorial plasma bubble (EPB) zonal drifts over Brazil from 2000 to 2007. On average, the M2 contributes 5.6 % to the variability of the EPB zonal drifts. A strong seasonal and solar cycle dependency was also observed, the amplitudes of the M2 being stronger during the summer and high solar activity periods.
Manfred Ern, Mohamadou Diallo, Peter Preusse, Martin G. Mlynczak, Michael J. Schwartz, Qian Wu, and Martin Riese
Atmos. Chem. Phys., 21, 13763–13795, https://doi.org/10.5194/acp-21-13763-2021, https://doi.org/10.5194/acp-21-13763-2021, 2021
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Details of the driving of the semiannual oscillation (SAO) of the tropical winds in the middle atmosphere are still not known. We investigate the SAO and its driving by small-scale gravity waves (GWs) using satellite data and different reanalyses. In a large altitude range, GWs mainly drive the SAO westerlies, but in the upper mesosphere GWs seem to drive both SAO easterlies and westerlies. Reanalyses reproduce some features of the SAO but are limited by model-inherent damping at upper levels.
Felix Ploeger, Mohamadou Diallo, Edward Charlesworth, Paul Konopka, Bernard Legras, Johannes C. Laube, Jens-Uwe Grooß, Gebhard Günther, Andreas Engel, and Martin Riese
Atmos. Chem. Phys., 21, 8393–8412, https://doi.org/10.5194/acp-21-8393-2021, https://doi.org/10.5194/acp-21-8393-2021, 2021
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We investigate the global stratospheric circulation (Brewer–Dobson circulation) in the new ECMWF ERA5 reanalysis based on age of air simulations, and we compare it to results from the preceding ERA-Interim reanalysis. Our results show a slower stratospheric circulation and higher age for ERA5. The age of air trend in ERA5 over the 1989–2018 period is negative throughout the stratosphere, related to multi-annual variability and a potential contribution from changes in the reanalysis system.
Mohamadou Diallo, Manfred Ern, and Felix Ploeger
Atmos. Chem. Phys., 21, 7515–7544, https://doi.org/10.5194/acp-21-7515-2021, https://doi.org/10.5194/acp-21-7515-2021, 2021
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Despite good agreement in the spatial structure, there are substantial differences in the strength of the Brewer–Dobson circulation (BDC) and its modulations in the UTLS and upper stratosphere. The tropical upwelling is generally weaker in ERA5 than in ERAI due to weaker planetary and gravity wave breaking in the UTLS. Analysis of the BDC trend shows an acceleration of the BDC of about 1.5 % decade-1 due to the long-term intensification in wave breaking, consistent with climate predictions.
Ana Roberta Paulino, Fabiano da Silva Araújo, Igo Paulino, Cristiano Max Wrasse, Lourivaldo Mota Lima, Paulo Prado Batista, and Inez Staciarini Batista
Ann. Geophys., 39, 151–164, https://doi.org/10.5194/angeo-39-151-2021, https://doi.org/10.5194/angeo-39-151-2021, 2021
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Long- and short-period oscillations in the lunar semidiurnal tidal amplitudes in the ionosphere derived from the total electron content were investigated over Brazil from 2011 to 2014. The results showed annual, semiannual and triannual oscillations as the dominant components. Additionally, the most pronounced short-period oscillations were observed between 7 and 11 d, which suggest a possible coupling of the lunar tide and planetary waves.
Cited articles
Adam, O., Bischoff, T., and Schneider, T.: Seasonal and interannual variations of the energy flux equator and ITCZ. Part I: Zonally averaged ITCZ position, J. Climate, 29, 3219–3230, https://doi.org/10.1175/JCLI-D-15-0512.1, 2016. a, b
Alexander, M., Grimsdell, A., Stephan, C. C., and Hoffmann, L.: MJO-related intraseasonal variation in the stratosphere: Gravity waves and zonal winds, J. Geophys. Res.-Atmos., 123, 775–788, https://doi.org/10.1002/2017JD027620, 2018. a, b, c, d
Alexander, M. J. and Vincent, R. A.: Gravity waves in the tropical lower stratosphere: a model study of seasonal and interannual variability, J. Geophys. Res.-Atmos., 105, https://doi.org/10.1029/2000JD900197, 2000. a
Alexander, M. J., Beres, J. H., and Pfister, L.: Tropical stratospheric gravity wave activity and relationships to clouds, J. Geophys. Res.-Atmos., 105, 22299–22309, https://doi.org/10.1029/2000JD900326, 2000. a
Alexander, M. J., May, P. T., and Beres, J. H.: Gravity waves generated by convection in the Darwin area during the Darwin Area Wave Experiment, J. Geophys. Res.-Atmos., 109, https://doi.org/10.1029/2004JD004729, 2004. a
Alexander, P., de la Torre, A., and Llamedo, P.: Interpretation of gravity wave signatures in GPS radio occultations, J. Geophys. Res.-Atmos., 113, 22299–22309, https://doi.org/10.1029/2007JD009390, 2008. a, b, c
Anthes, R. A., Bernhardt, P. A., Chen, Y., Cucurull, L., Dymond, K. F., Ector, D., Healy, S. B., Ho, S.-P., Hunt, D. C., Kuo, Y.-H., Liu, H., Manning, K., McCormick, C., Meehan, T. K., Randel, W. J., Rocken, C., Schreiner, W. S., Sokolovskiy, S. V., Syndergaard, S., Thompson, D. C., Trenberth, K. E., Wee, T.-K., Yen, N. L., and Zeng, Z.: The COSMIC/FORMOSAT-3 mission: Early results, B. Am. Meteorol. Soc., 89, 313–334, https://doi.org/10.1175/BAMS-89-3-313, 2008. a
Ayorinde, T. T., Wrasse, C. M., Takahashi, H., da Silva Barros, D., Figueiredo, C. A. O. B., Lomotey, S. O., Essien, P., and Bilibio, A. V.: Stratospheric gravity wave potential energy and tropospheric parameters relationships over South America: a study using COSMIC-2 and METOP radio occultation measurements, Earth Planets Space, 75, https://doi.org/10.1186/s40623-023-01891-8, 2023. a, b
Ayorinde, T. T., Wrasse, C. M., Takahashi, H., Barros, D., Figueiredo, C. A. O. B., da silva, L. A., and Bilibio, A. V.: Investigation of the long-term variation of gravity waves over South America using empirical orthogonal function analysis, Earth Planets Space, 76, 105, https://doi.org/10.1186/s40623-024-02045-0, 2024. a
Bain, C. L., De Paz, J., Kramer, J., Magnusdottir, G., Smyth, P., Stern, H., and Wang, C.-C.: Detecting the ITCZ in instantaneous satellite data using spatiotemporal statistical modeling: ITCZ climatology in the east Pacific, J. Climate, 24, 216–230, https://doi.org/10.1175/2010JCLI3716.1, 2011. a, b
Baldwin, M. P., Gray, L. J., Dunkerton, T. J., Hamilton, K., Haynes, P. H., Randel, W. J., Holton, J. R., Alexander, M. J., Hirota, I., Horinouchi, T., Jones, D. B. A., Kinnersley, J. S., Marquardt, C., Sato, K., and Takahashi, M.: The quasi-biennial oscillation, Rev. Geophys., 39, 179–229, https://doi.org/10.1029/1999RG000073, 2001. a, b
Basha, G., Kishore, P., Ratnam, M. V., Ouarda, T. B., Velicogna, I., and Sutterley, T.: Vertical and latitudinal variation of the intertropical convergence zone derived using GPS radio occultation measurements, Remote Sens. Environ., 163, 262–269, https://doi.org/10.1016/j.rse.2015.03.024, 2015. a, b
Boers, N., Bookhagen, B., Marwan, N., Kurths, J., and Marengo, J.: Complex networks identify spatial patterns of extreme rainfall events of the South American Monsoon System, Geophys. Res. Lett., 40, 4386–4392, https://doi.org/10.1002/grl.50681, 2013. a
Byrne, M. P., Pendergrass, A. G., Rapp, A. D., and Wodzicki, K. R.: Response of the intertropical convergence zone to climate change: Location, width, and strength, Current Climate Change Reports, 4, 355–370, https://doi.org/10.1007/s40641-018-0110-5, 2018. a, b
Calvo, N., Garcia, R., Randel, W., and Marsh, D.: Dynamical mechanism for the increase in tropical upwelling in the lowermost tropical stratosphere during warm ENSO events, J. Atmos. Sci., 67, 3018–3038, https://doi.org/10.1175/2010JAS3433.1, 2010. a
Diallo, M., Konopka, P., Santee, M. L., Müller, R., Tao, M., Walker, K. A., Legras, B., Riese, M., Ern, M., and Ploeger, F.: Structural changes in the shallow and transition branch of the Brewer–Dobson circulation induced by El Niño, Atmos. Chem. Phys., 19, 425–446, https://doi.org/10.5194/acp-19-425-2019, 2019. a, b, c
Diallo, M., Ern, M., and Ploeger, F.: The advective Brewer–Dobson circulation in the ERA5 reanalysis: climatology, variability, and trends, Atmos. Chem. Phys., 21, 7515–7544, https://doi.org/10.5194/acp-21-7515-2021, 2021. a, b, c
Dias, J. and Pauluis, O.: Convectively coupled waves propagating along an equatorial ITCZ, J. Atmos. Sci., 66, 2237–2255, https://doi.org/10.1175/2009JAS3020.1, 2009. a
Ern, M., Ploeger, F., Preusse, P., Gille, J., Gray, L., Kalisch, S., Mlynczak, M., Russell III, J., and Riese, M.: Interaction of gravity waves with the QBO: A satellite perspective, J. Geophys. Res.-Atmos., 119, 2329–2355, https://doi.org/10.1002/2016GL068498, 2014. a, b, c
Fritts, D. C. and Alexander, M. J.: Gravity wave dynamics and effects in the middle atmosphere, Rev. Geophys., 41, https://doi.org/10.1029/2001RG000106, 2003. a
Garcia, S. R. and Kayano, M. T.: Some evidence on the relationship between the South American monsoon and the Atlantic ITCZ, Theoretical and Applied Climatology, 99, 29–38, https://doi.org/10.1007/s00704-009-0107-z, 2010. a
Geller, M. A., Zhou, T., and Yuan, W.: The QBO, gravity waves forced by tropical convection, and ENSO, J. Geophys. Res.-Atmos., 121, 8886–8895, https://doi.org/10.1002/2015JD024125, 2016. a
Godoi, V. A., de Andrade, F. M., Durrant, T. H., and Torres Júnior, A. R.: What happens to the ocean surface gravity waves when ENSO and MJO phases combine during the extended boreal winter?, Clim. Dynam., 54, 1407–1424, https://doi.org/10.1007/s00382-019-05065-9, 2020. a
Gu, G. and Zhang, C.: Cloud components of the intertropical convergence zone, J. Geophys. Res.-Atmos., 107, ACL–4, https://doi.org/10.1029/2002JD002089, 2002. a
Hersbach, H., Bell, B., Berrisford, P., Hirahara, S., Horányi, A., Muñoz-Sabater, J., Nicolas, J., Peubey, C., Radu, R., Schepers, D., Simmons, A., Soci, C., Abdalla, S., Abellan, X., Balsamo, G., Bechtold, P., Biavati, G., Bidlot, J., Bonavita, M., De Chiara, G., Dahlgren, P., Dee, D., Diamantakis, M., Dragani, R., Flemming, J., Forbes, R., Fuentes, M., Geer, A., Haimberger, L., Healy, S., Hogan, R. J., Hólm, E., Janisková, M., Keeley, S., Laloyaux, P., Lopez, P., Lupu, C., Radnoti, G., de Rosnay, P., Rozum, I., Vamborg, F., Villaume, S., and Thépaut, J.-N.: The ERA5 global reanalysis, Q. J. Roy. Meteor. Soc., 146, 1999–2049, https://doi.org/10.1002/qj.3803, 2020. a
Hu, Y., Li, D., and Liu, J.: Abrupt seasonal variation of the ITCZ and the Hadley circulation, Geophys. Res. Lett., 34, https://doi.org/10.1029/2007GL030950, 2007. a
Hwang, Y.-T. and Frierson, D. M.: Link between the double-Intertropical Convergence Zone problem and cloud biases over the Southern Ocean, P. Natl. Acad. Sci. USA, 110, 4935–4940, https://doi.org/10.1073/pnas.1213302110, 2013. a
Jin, D., Kim, D., Son, S.-W., and Oreopoulos, L.: QBO deepens MJO convection, Nature Communications, 14, 4088, https://doi.org/10.1038/s41467-023-39465-7, 2023. a
Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W., Deaven, D., Gandin, L., Iredell, M., Saha, S., White, G., Woollen, J., Zhu, Y., Chelliah, M., Ebisuzaki, W., Higgins, W., Janowiak, J., Mo, K. C., Ropelewski, C., Wang, J., Leetmaa, A., Reynolds, R., Jenne, R., and Joseph, D.: The NCEP/NCAR 40-year reanalysis project, in: Renewable energy, Routledge, 146–194, ISBN 9781315793245, https://doi.org/10.4324/9781315793245, 2018. a
Kang, M.-J., Chun, H.-Y., and Garcia, R. R.: Role of equatorial waves and convective gravity waves in the 2015/16 quasi-biennial oscillation disruption, Atmos. Chem. Phys., 20, 14669–14693, https://doi.org/10.5194/acp-20-14669-2020, 2020. a
Kerns, B. W. and Chen, S. S.: Diurnal cycle of precipitation and cloud clusters in the MJO and ITCZ over the Indian Ocean, J. Geophys. Res.-Atmos., 123, 10–140, https://doi.org/10.1029/2018JD028589, 2018. a, b
Kalisch, S., Kang, M. J. and Chun, H. Y.: Impact of Convective Gravity Waves on the Tropical Middle Atmosphere During the Madden‐Julian Oscillation, Journal of Geophysical Research: Atmospheres, 123, 8975–8992, https://doi.org/10.1029/2017JD028221, 2018.
Klotzbach, P., Abhik, S., Hendon, H., Bell, M., Lucas, C., G. Marshall, A., and Oliver, E.: On the emerging relationship between the stratospheric Quasi-Biennial oscillation and the Madden-Julian oscillation, Sci. Rep., 9, 2981, https://doi.org/10.1038/s41598-019-40034-6, 2019. a
Konopka, P., Ploeger, F., Tao, M., and Riese, M.: Zonally resolved impact of ENSO on the stratospheric circulation and water vapor entry values, J. Geophys. Res.-Atmos., 121, 11–486, https://doi.org/10.1002/2015JD024698, 2016. a
Kursinski, E. R., Hajj, G. A., Schofield, J. T., Linfield, R. P., and Hardy, K. R.: Observing Earth's atmosphere with radio occultation measurements using the Global Positioning System, J. Geophys. Res.-Atmos., 102, 23429–23465, https://doi.org/10.1029/97JD01569, 1997. a, b
Kutner, M. H., Nachtsheim, C. J., Neter, J., and Wasserman, W.: Applied linear regression models, 4th edn., McGraw-Hill/Irwin, New York, https://doi.org/10.1080/00401706.1997.10485142, 2004. a
Läderach, A. and Raible, C. C.: Lower-tropospheric humidity: climatology, trends and the relation to the ITCZ, Tellus A, 65, 20413, https://doi.org/10.3402/tellusa.v65i0.20413, 2013. a, b, c
Li, T., Calvo, N., Yue, J., Dou, X., Russell Iii, J., Mlynczak, M., She, C.-Y., and Xue, X.: Influence of El Niño-Southern Oscillation in the mesosphere, Geophys. Res. Lett., 40, 3292–3296, https://doi.org/10.1002/grl.50598, 2013. a
Liu, X., Yue, J., Xu, J., Garcia, R. R., Russell III, J. M., Mlynczak, M., Wu, D. L., and Nakamura, T.: Variations of global gravity waves derived from 14 years of SABER temperature observations, J. Geophys. Res.-Atmos., 122, 6231–6249, https://doi.org/10.1002/2017JD026604, 2017. a, b
Mamalakis, A., Randerson, J. T., Yu, J.-Y., Pritchard, M. S., Magnusdottir, G., Smyth, P., Levine, P. A., Yu, S., and Foufoula-Georgiou, E.: Zonally contrasting shifts of the tropical rain belt in response to climate change, Nature Climate Change, 11, 143–151, https://doi.org/10.1038/s41558-020-00963-x, 2021. a, b
Mitchell, D. M., Gray, L. J., Fujiwara, M., Hibino, T., Anstey, J. A., Ebisuzaki, W., Harada, Y., Long, C., Misios, S., Stott, P. A., and Tan, D.: Signatures of naturally induced variability in the atmosphere using multiple reanalysis datasets, Q. J. Roy. Meteor. Soc., 141, 2011–2031, https://doi.org/10.1002/qj.2492, 2015. a
Moss, A. C., Wright, C. J., and Mitchell, N. J.: Does the Madden-Julian Oscillation modulate stratospheric gravity waves?, Geophys. Res. Lett., 43, 3973–3981, https://doi.org/10.1002/2016GL068498, 2016. a, b, c, d
Münnich, M. and Neelin, J. D.: Seasonal influence of ENSO on the Atlantic ITCZ and equatorial South America, Geophys. Res. Lett., 32, https://doi.org/10.1029/2005GL023900, 2005. a
Namboothiri, S., Jiang, J., Kishore, P., Igarashi, K., Ao, C., and Romans, L.: CHAMP observations of global gravity wave fields in the troposphere and stratosphere, J. Geophys. Res.-Atmos., 113, https://doi.org/10.1029/2007JD008912, 2008. a
Pfenninger, M., Liu, A. Z., Papen, G. C., and Gardner, C. S.: Gravity wave characteristics in the lower atmosphere at South Pole, J. Geophys. Res.-Atmos., 104, 5963–5984, https://doi.org/10.1029/98JD02705, 1999. a
Pfister, L., Chan, K., Bui, T., Bowen, S., Legg, M., Gary, B., Kelly, K., Proffitt, M., and Starr, W.: Gravity waves generated by a tropical cyclone during the STEP tropical field program: A case study, J. Geophys. Res.-Atmos., 98, 8611–8638, https://doi.org/10.1029/92JD01679, 1993. a
Ratnam, M. V., Tetzlaff, G., and Jacobi, C.: Global and seasonal variations of stratospheric gravity wave activity deduced from the CHAMP/GPS satellite, J. Atmos. Sci., 61, 1610–1620, https://doi.org/10.1175/1520-0469(2004)061<1610:GASVOS>2.0.CO;2, 2004. a, b
Rojas, M., Arias, P. A., Flores-Aqueveque, V., Seth, A., and Vuille, M.: The South American monsoon variability over the last millennium in climate models, Clim. Past, 12, 1681–1691, https://doi.org/10.5194/cp-12-1681-2016, 2016. a
Scherllin-Pirscher, B., Steiner, A. K., Anthes, R. A., Alexander, M. J., Alexander, S. P., Biondi, R., Birner, T., Kim, J., Randel, W. J., Son, S.-W., Tsuda, T., and Zeng, Z.: Tropical temperature variability in the UTLS: New insights from GPS radio occultation observations, J. Climate, 34, 2813–2838, https://doi.org/10.1175/JCLI-D-20-0385.1, 2021. a
Schmidt, T., De La Torre, A., and Wickert, J.: Global gravity wave activity in the tropopause region from CHAMP radio occultation data, Geophys. Res. Lett., 35, https://doi.org/10.1029/2008GL034986, 2008. a, b
Schmidt, T., Alexander, P., and De la Torre, A.: Stratospheric gravity wave momentum flux from radio occultations, J. Geophys. Res.-Atmos., 121, 4443–4467, https://doi.org/10.1017/CBO9780511608285, 2016. a
Schneider, T., Bischoff, T., and Haug, G. H.: Migrations and dynamics of the intertropical convergence zone, Nature, 513, 45–53, https://doi.org/10.1038/nature13636, 2014. a, b
Smith, E. K. and Weintraub, S.: The constants in the equation for atmospheric refractive index at radio frequencies, Proceedings of the IRE, 41, 1035–1037, https://doi.org/10.1109/JRPROC.1953.274297, 1953. a
Smith, S. M., Setvák, M., Beletsky, Y., Baumgardner, J., and Mendillo, M.: Mesospheric Gravity Wave Momentum Flux Associated With a Large Thunderstorm Complex, J. Geophys. Res.-Atmos., 125, e2020JD033381, https://doi.org/10.1029/2020JD033381, 2020. a
Tian, B. and Dong, X.: The double-ITCZ bias in CMIP3, CMIP5, and CMIP6 models based on annual mean precipitation, Geophys. Res. Lett., 47, e2020GL087232, https://doi.org/10.1029/2020GL087232, 2020. a
Torrence, C. and Compo, G. P.: A practical guide to wavelet analysis, B. Am. Meteorol. Soc., 79, 61–78, https://doi.org/10.1175/1520-0477(1998)079<0061:APGTWA>2.0.CO;2, 1998. a
Tsuda, T., Nishida, M., Rocken, C., and Ware, R. H.: A global morphology of gravity wave activity in the stratosphere revealed by the GPS occultation data (GPS/MET), J. Geophys. Res.-Atmos., 105, 7257–7273, https://doi.org/10.1029/2009GL039777, 2000. a, b, c, d
Wang, W., Matthes, K., Omrani, N.-E., and Latif, M.: Decadal variability of tropical tropopause temperature and its relationship to the Pacific Decadal Oscillation, Sci. Rep., 6, 29537, https://doi.org/10.1038/srep29537, 2016. a
Wei, Y., Ren, H.-L., Duan, W., and Sun, G.: MJO-equatorial Rossby wave interferences in the tropical intraseasonal oscillation, Clim. Dynam., 1–20, https://doi.org/10.1007/s00382-024-07380-2, 2024. a
Wheeler, M. and Kiladis, G. N.: Convectively coupled equatorial waves: Analysis of clouds and temperature in the wavenumber–frequency domain, J. Atmos. Sci., 56, 374–399, https://doi.org/10.1175/1520-0469(1999)056<0374:CCEWAO>2.0.CO;2, 1999. a
Wheeler, M. C. and Hendon, H. H.: An All-Season Real-Time Multivariate MJO Index: Development of an Index for Monitoring and Prediction, Mon. Weather Rev., 132, 1917–1932, https://doi.org/10.1175/1520-0493(2004)132<1917:AARMMI>2.0.CO;2, 2004. a
Wolter, K. and Timlin, M. S.: El Niño/Southern Oscillation behaviour since 1871 as diagnosed in an extended multivariate ENSO index (MEI. ext), Int. J. Climatol., 31, 1074–1087, https://doi.org/10.1002/joc.2336, 2011. a, b
Xie, S.-P., Peng, Q., Kamae, Y., Zheng, X.-T., Tokinaga, H., and Wang, D.: Eastern Pacific ITCZ dipole and ENSO diversity, J. Climate, 31, 4449–4462, https://doi.org/10.1175/JCLI-D-17-0905.1, 2018. a
Yang, C., Smith, A. K., Li, T., Kinnison, D. E., Li, J., and Dou, X.: Can the Madden-Julian Oscillation Affect the Antarctic Total Column Ozone?, Geophys. Res. Lett., 47, e2020GL088886, https://doi.org/10.1029/2020GL088886, 2020. a
Zhang, C.: Madden-julian oscillation, Rev. Geophys., 43, https://doi.org/10.1029/2004RG000158, 2005. a
Zhang, G. J., Song, X., and Wang, Y.: The double ITCZ syndrome in GCMs: A coupled feedback problem among convection, clouds, atmospheric and ocean circulations, Atmos. Res., 229, 255–268, https://doi.org/10.1016/j.atmosres.2019.06.023, 2019. a
Zheng, Y., Bourassa, M. A., and Hughes, P.: Influences of sea surface temperature gradients and surface roughness changes on the motion of surface oil: A simple idealized study, Journal of Applied Meteorology and Climatology, 52, 1561–1575, https://doi.org/10.1175/JAMC-D-12-0211.1, 2013. a
Zhou, T., DallaSanta, K. J., Orbe, C., Rind, D. H., Jonas, J. A., Nazarenko, L., Schmidt, G. A., and Russell, G.: Exploring the ENSO modulation of the QBO periods with GISS E2.2 models, Atmos. Chem. Phys., 24, 509–532, https://doi.org/10.5194/acp-24-509-2024, 2024. a
Short summary
We studied how the Intertropical Convergence Zone (ITCZ) interacts with atmospheric gravity waves high in the sky and how global climate patterns like El Niño affect them. Using RO, ERA5, and NCEP reanalysis data, we found that the ITCZ shifts with season but stays strong year-round, influencing weather and energy flow. Our findings show how climate patterns shape weather systems and help predict changes, improving understanding of the atmosphere and its effects on global climate.
We studied how the Intertropical Convergence Zone (ITCZ) interacts with atmospheric gravity...
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