Nivar

Nivar

Analysis of the role of the Hadley Cell in the variability of the moist static energy flux in the statistical period of 1980–2025

Document Type : Original Article

Authors
Mohammad Moradi 1
Gholamreza Barati 2
1 Professor, Department of Synoptic and Dynamic meteorology, Research Institute of Meteorology and Atmospheric Science (RIMAS), Tehran, Iran
2 Department of Physical Geography, Faculty of Earth Sciences, University of shahid beheshti,Tehran, Iran
10.30467/nivar.2026.582354.1380
Abstract
The Hadley cell is a large-scale thermally driven enclosed atmospheric circulation over the tropics, with warmer air rising around the equator and cooler air sinking over the subtropics of both hemispheres. This deep convection circulation is characterized by ascending motions of warm and moist air converging near the equator, followed by poleward flows in the upper troposphere in both hemispheres, which descend over the dry subtropics and return equatorward near the surface in the form of trade winds.
In this study, we used the historical data of NCEP/NCAR from the National Centers for Environmental Prediction and the National Center for Atmospheric Research, covering 1980 to 2025. We used the daily means of temperature, height, specific humidity, and the meridional wind component on eight pressure levels from 1000 to 300 hPa. First, the average moist static energy and the meridional circulation of this quantity were estimated, and then the role of the Hadley cell in the transfer of moist static energy was analyzed.
The results showed that part of the moist static energy that is transferred to different regions by the meridional mean circulation is limited to levels below 700 hPa in the cold and warm seasons of both hemispheres, and the values of the moist static energy flux by the Hadley cell in the cold months of the Northern and Southern Hemispheres in the northern and southern tropical regions are positive and negative, respectively, indicating poleward transfer in this part of both hemispheres.
During these months, when the solar declination angle is negative in the winter hemisphere and the Intertropical Convergence Zone (ITCZ) belt is located in the summer hemisphere, the transfer of moist static energy by the Hadley cell is from the equator of the summer hemisphere to the equator of the winter hemisphere.
In this process, in the Northern Hemisphere winter, the presence of southerly currents causes moist static energy to be transferred from the southern tropical regions to the northern tropical regions.
Keywords
Moist static energy
Hadley cell
Poleward energy flux
Mean meridional circulation
Subjects
 
1.    Adam, O., Bischoff, T., and Schneider, T. (2016). Seasonal and interannual variations of the energy flux equator and ITCZ. Part I: Zonally averaged ITCZ position. J. Climate, 29, 3219–3230, doi: 10.1175/JCLI-D-15-0512.1.
2.    Adames, A.F., and Mayta, V.C. (2023). On the Accuracy of the Moist Static Energy Budget When Applied to Large-Scale Tropical Motions. Journal of the atmospheric science, 80, 2365-2376. doi: 10.1175/JCLI-D-15-0512.1.
3.    Barpanda, P., and Shaw, T. (2017). Using the moist static energy budget to understand storm-track shifts across a range of time scales. J. Atmos. Sci.,74, 2427–2446. doi:10.1175/JAS-D-17-0022.1.
4.    Galanti, E., Raiter, D., Kaspi, Y., and Tziperman, E. (2022). Spatial patterns of the tropical meridional circulation: Drivers and teleconnections. Journal of Geophysical Research: Atmospheres, 127,1-15. Doi: 10.1029/2021JD035531.
5.    Hill, S.A., Ming, Y., and Held, I.M. (2015). Mechanisms of forced tropical meridional energy flux change. J. Climate, 28, 1725–1742, doi:10.1175/JCLI-D-14-00165.1.
6.    Hosseini Seddigh, S.M., & Jalali, M. (2021). Analysis dynamic structure of Hadley Cell circulation in tropical belt. Journal of The Nivar, 45(112-113), 1-15. [in Persian]. doi: 10.30467/NIVAR.2021.237927.1164
7.    Hoskins, B.J., and Yang, G.Y. (2023). A global perspective on the upper branch of the Hadley Cell. Journal of Climate, 36 (19), 6749-6762. doi: 10.1175/JCLI-D-22-0537.1.
8.    Huang, R., Chen, S., Chen, W., and Hu, P. (2018). Inter annual variability of regional Hadley circulation intensity over western Pacific during boreal winter and its climatic impact over Asia Australia region. Journal of Geophysical Research: Atmospheres, 123, 344–366. doi: 10.1002/2017JD027919.
9.    Hwang, Y.T., Teseng, H.Y., Li, K.C., Jang, S.M., Chen, Y.J., and Chiang, J.C.H. (2021). Relative Roles of Energy and Momentum Fluxes in the Tropical Response to Extratropical Thermal Forcing. Journal of climate, 34, 3771-3786. doi: 10.1175/JCLI-D-20-0151.1.
10. 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. (1996). The NCEP/NCAR 40-year reanalysis project. Bull. Am. Meteorol. Soc. 77, 437–472. doi: 10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2.
11. Laing, A., and Evans, J.L. (2016). An introduction to tropical meteorology. 2end edition.
12. Lionello, P., D'Agostino, R., Ferreira, D., Nguyen, H., and Singh, M.S. (2024). The Hadley circulation in a changing climate. Annals of New York Academy of Science, 1534 (1), 69-93. doi: 10.1111/nyas.15114.
13. Liao, X., Li, T., and Ma, C. (2022). Moist Static Energy and Secondary Circulation Evolution Characteristics during the Rapid Intensification of Super Typhoon Yutu (2007). Atmosphere 2022, 13, 1105. doi: 10.3390/atmos13071105.
14. Lorenz, E.N. (1955). Available potential energy and the maintenance of the general circulation. Tellus, 7, 157–167. doi: 10.3402/tellusa. v7i2.8796.
15. Moradi, M. (2003). Energy calculation in a case study. 03rd Conference of Numerical Weather Prediction, Iran, Tehran, 15 December 2003, [in Persian]. https://civilica.com/doc/10386/.   
16. Moradi, M. (2023). A Statistical Analysis of the Tropopause Characteristic over Tehran and Shiraz in January and July (2000-2022). Physical Geography Research Quarterly, 55(1), 39-55. [in Persian]. doi: 10.22059/jphgr.2023.354992.1007747.
17. Moradi, M. (2024). Investigation the Role of Global Warming on the Tropospheric Circulation in the Middle East from 1961 to 2020. Physical Geography Research Quarterly, 56 (3), 1-17. [in Persian]. doi: 10.22059/jphgr.2024.366330.1007791.
18. Moradi, M., and Barati, G. (2026). Analysis of annual and seasonal variability of the Hadley cell in 1980-2025. Physical Geography Research, 58(1),101-118, [in Persian]. doi:0.22059/jphgr.2026.411156.1007919.
19. Peixoto, J. P., and Oort, A. H. (1992). Physics of Climate. American Institute of Physics: New York.
20. Rencurrel, M. C., and Rose, B.E.J. (2018). The Efficiency of the Hadley Cell Response to Wide Variations in Ocean Heat Transport Journal of Climate, 33, 1643–1658. doi: 10.1175/JCLI-D-17-0856.1.
21. Sellers, W.D. 1965: Physical climatology. Chicago: University of Chicago Press, 272 pp.
22. Wallace, J.M., and Hobbs, P.V. (2006). Atmospheric Science, An Introductory Survey, Second Edition, University of Washington, Academic Press is an imprint of Elsevier, pp 505.
23. Zheng, Y., Sun, B., Li, W., Zhou, S., Cay, J., Li, H., and He, S. (2025). Attribution of regional Hadley circulation intensity changes in the Northern Hemisphere. Atmospheric and Oceanic Science Letters, 18(6), 1-6. doi: 10.1016/j.aosl.2025.100613.
 
 
 

  • Receive Date 19 May 2026
  • Revise Date 20 June 2026
  • Accept Date 22 June 2026
  • Publish Date 21 March 2026