Study of mixing layer height in Mehrabad airport,Case Study: Period 2017-1998

Document Type : Original Article

Authors

1 gilan meteorology organization

2 Assistant Prof. of Atmospheric Science and Meteorological Research (ASMERC)

10.30467/nivar.2018.130815.1087

Abstract

In this study we obtained the maximum height of the mixed layer for each day in the time period 1998 to 2017 by using the radiosonde zero Greenwich data of Mehrabad airport station in Tehran and also using the maximum temperature measured at 12 GMT at the same station. The mean value of the depth of the mixed layer whit monthly time separation during the studied time period as well as the maximum, minimum and average height of the mixed layer for January, December, July and August were calculated as the representative of the two cold and two warm months. In the following the selected samples were analyzed by the SKEW-T chart. The results showed that the average maximum height of the mixed layer in warm seasons was between 3 to 4 km and in cold seasons between 1 and 2.5 km. The purpose of this research is to provide a method that predicts the depth of the mixed layer by using the upper air data of the zero GTM and also using the predicted maximum temperature. The predicted results can be used in suitable time range for practical, scientific and prognosis purposes.

Keywords

Main Subjects

References

منابع
1. احمدی گیوی، ف.، ثابت قدم، س. و علی اکبری بیدختی، ع. ع.، 1388: بررسی نوسان عمق لایه آمیخته جو شهری تهران با استفاده از مدل و عوامل موثر در آن. مجله فیزیک زمین و فضا، (2)35، 105-117.
2. مرادی، م.، پرهیزکار، د. و رضازاده، پ، 1380: اسکیوتی و محاسبه چند کمیت ترمودینامیکی. اولین کارگاه پیش بینی عددی وضع هوا، تهران، 1380.
3. مرادی، 1390: مقدمه ای بر هواشناسی دینامیکی 1. انتشارات سید باقر حسینی.
4. نصیری، ب.، زارعی، ز.، حلبی، م. و رستمی، م. 1395: بررسی تغییرات ارتفاع لایه آمیخته و ضخامت لایه مرزی در شرایط گرد و غباری شهر اهواز. تحلیل فضائی مخاطرات محیطی، سال سوم، شماره 2. صص 64-51.
5. یار احمدی،د.، حلبی، م. و زارعی، ز.، 1395: بررسی تغییرات ماهانه ارتفاع لایه مرزی در شرایط وارونگی بحرانی، مطالعه موردی ایستگاه مهرآباد تهران. آمایش جغرافیائی فضا، سال ششم، شماره 212 صص 124-115.
6. Garratt, A. J., 1992: The atmospheric boundary layer. Cambridge University Press, 335 pp.
7. Holton, J. R., 2004: An Introduction to Dynamic Meteorology, Fourth Edition.
8. Panofsky, H. A., and Dutton, J. A., 1984: Atmospheric turbulence. New York, Wiley & Sons, 397 pp.
9. Seidel, D. J., Ao, C. O., and Li, K., 2010: Estimating climatological planetary boundary layer heights from radiosonde observations: Comparison of methods and uncertainty analysis, J. Geophys. Res., 115, D16113, doi:10.1029/2009JD013680.
10. Stull, R. B., 1988: An Introduction to boundary layer meteorology. Dordrecht, Kluwer Academic Publishers, 670 pp.
11. Stull, R. B., 2000: Meteorology for scientists and engineers. Brooks/Cole, 502 pp.
12. Wang, X. Y. and Wang, K. C., 2014: Estimation of atmospheric mixing layer height from radiosonde data, Atmos. Meas. Tech., 7, 1701–1709
Nivar
Volume 42, 102-103
September 2018
Pages 31-40

Files

History

  • Receive Date: 14 May 2018
  • Revise Date: 23 October 2018
  • Accept Date: 18 September 2018
  • First Publish Date: 23 September 2018

Share

How to cite

Statistics