Evaluations of the Characteristics of the Tropo-Strato-Mesopause Height and Temperature Variability over Bahir Dar, Ethiopia (11.60 N, 37.30 E) Using SABER

Chalachew Lingerew (Washera Geospace and Radar Science Research Laboratory (WaGRL) Bahir Dar University, Department of physics,Bahir Dar, Ethiopia;Departments of physics, college of science, Kebri Dehar university, Kebri Dehar, Ethiopia)
U. Jaya Prakash Raju (Washera Geospace and Radar Science Research Laboratory (WaGRL) Bahir Dar University, Department of physics,Bahir Dar, Ethiopia)

Abstract


The height profile of atmospheric temperature data between 12 km and 100 km was obtained from SABER/TIMED satellite instruments during the year 2016 and used to characterize the three atmospheric pauses temporal variability of height and temperature over Bahir Dar, Ethiopia (11.60 N, 37.30 E). The daily, monthly, and frequency distributions of tropopause-stratopause-mesopause height and temperature are investigated. From the frequency distribution, we had found that of the tropopause-stratopause-mesopause height 17 km, 48 km, and 98 km with the corresponding temperature 192 K, 268 K, and 148 K. The decrement (cooling) trend lines of tropopause height 0.7 K/year and its corresponding tropopause increment temperature has been ~1.5 K/year. The stratopause and mesopause trend lines of height are insignificant and the corresponding decrement (cooling) temperatures are ~3 K/year and ~13 K/year respectively. The mean monthly maximum heights of tropopause 19 km in May with a corresponding maximum temperature of 201 K in September. The maximum stratopause height 49.5 km in February and July and its temperature 268 K and 267 K in February and April respectively. The maximum mesopause height 98 km, 95 km, 97 km in March, Jun, and November respectively, and its maximum temperature 196 K and 198 K in January and July respectively.


Keywords


SABER;Tropopause-Stratopause-Mesopause height and temperature

Full Text:

PDF

References


[1]Gettelman, A., Forster, P., M. Climatology of the tropical tropopause layer. Journal of the Meteorological Society of Japan, 2002, 80 (4B), 911-924.

[2]Sharma, S., Sridharan, S., Chandra, H., S., Acharya, Y., B. Middle atmospheric thermal structure over subtropical and tropical Indian locations using Rayleigh lidar. Planetary and Space Science, 2012, 63, 36-48.

[3]Krishnaiah. M, U Jaya Parkash Raju. Lidar observation of middle atmospheric temperature variability over low altitude. Indian Journal of Radio and Space Physics, 2003, 33, 50-57

[4]Holton, J. R., Haynes, P. H., McIntyre, M. E., Douglass, A. R., Rood, R. B., Pfister, L. Stratosphere-troposphere exchange. Reviews of geophysics, 1995, 33(4), 403-439.

[5]Alan Z.L., Gary R.S. Characteristics of instabilities in the Mesopause region over Maui, Hawaii, Journal of Geophysical Research: Atmospheres (1984-2012), 2005, 110(D9).

[6]Rouble, R. G., Dickinson, R. E. How will changes in carbon dioxide and methane modify the main structure of the mesosphere and thermosphere? Geophysics. Res. Lett., 1989, 16(12):1441-1444. DOI: 10.1029/GL016i012p01441. Experiment 1. Geophysics. Res., 98, 10667-10677, 1993.

[7]Russell III, J., M., G., Godley, L. L., Tan sock, J., R. Overview of the SABER experiment and preliminary calibration results, Proc. SPIE int Soc. Opt. Eng., 1999, 3756, 277-288.

[8]Mertens et al. Retrieval of mesospheric and lower thermospheric kinetic temperature from measurements of, Geophysical Research Letters, 2002, 28(7):1391-1394.

[9]Chandra, H., Som Sharma, Y. B., Acharya, Jayaraman, A. A Rayleigh lidar study of the atmospheric temperature structure over Mt. Abu, India. Journal of Indian Geophysical Union, 2005, 9(4):279-298.

[10]Siva Kumar. Lidar studies of the middle atmospheric temperature structure and tropospheric cirrus clouds over a low latitude, Ph.D. Thesis, S. V. University, India, 2002.

[11]Nee et al. Middle atmospheric temperature structure over two tropical locations. Chung Li (25_N, 121_E) and Gadanki (13.4_N, 79.2_E), J. Atmos. Sol. Terr. Phys., 2002, 64, 1311-1319. DOI: 10.1016/S1364-6826 (02)00114-1.

[12]Sivakumar, et al. Rayleigh LIDAR and satellite (HALOE, SABER, CHAMP, and COSMIC) measurements of stratosphere mesosphere temperature over a southern sub-tropical: climatology and comparison study, Annales Geophysicae, 2011, 29(4).

[13]Venkat Ratnam, et al. Tropical Mesopause: is it always close to 100 km, Journal of Geophysical Research: Atmospheres (1984-2012), 2010, 115 (D6).

[14]Ramaswamy, V., Chanin, M.-L., Angell, J., Barnett, J., Geffen, D., Gellman, et al. Stratospheric temperature trends: Observations and model simulations Reviews of Geophysics, 2001, 39(1):71-122.



DOI: https://doi.org/10.30564/jasr.v4i1.2539

Refbacks

  • There are currently no refbacks.
Copyright © 2021 Chalachew Lingerew, Jaya Prakash Raju Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.