Applied Research in Geographical Sciences

Applied Research in Geographical Sciences

Thermal advection analysis of cooling waves of Iran

Authors
Younes Khosravi 1
Mehdi Dostkamian 2
Allah Morad Taherian 3
Amin Shiri Karim vand 4
1 Assistant Professor, Department of Environmental Science and Faculty Member of Zanjan University, Iran .
2 Ph.D. student of climate change, University of Zanjan, Iran.
3 Senior Scientist of Synoptic Climate, University of Zanjan, Iran.
4 Senior Scientist of Synoptic Clinical Sciences, Zanjan University, Iran.
10.29252/jgs.18.50.17
Abstract
Survey of advection of cold waves in Iran is the main aim of this study. In this regard, 45 synoptic stations were employed and studied. In order to investigate the thermal advection of cold waves, 1000, 850, 700 and 500 hp levels were reviewed and analyzed. Results indicated that cold waves in Iran most affected thermal advection caused by Tibet- Siberia, Siberias integrated Turkmenistan high-pressure, High pressure belt of Siberia - East Europe High pressure, Siberian high-pressure multi-core pattern and High-pressure belt of East of Caspian Sea integrated Black Sea High pressure. In the meantime, thermal advection of Siberian high pressure has been more impressive than other patterns. This system moved towards lower latitudes by anti-cyclone moving, So the cold weather of northern latitudes loss in lower latitudes North East of Iran, North West and Central parts of Iran. However, when Siberian high pressure combined with other patterns, its role in the advection of cold air have been considerable
Keywords
Thermal Advection
Cold Advection
Combined patterns
Iran
Ding, Y., & Krishnamurti, T. N. (1987), Heat budget of the Siberian high and the winter monsoon. Monthly Weather Review, 115(10), 2428-2449.
Dube R.K. Prakasa Rao G S. ,( 2005), Extreme Weather Events Over India in the Last 100 years, J.Ind.Geophys,:union: , 9(3), 173-178.
Fujibe, F., N. Yamazaki, K. Kobayashi, and H. Nakamigawa. (2007), longterm changes of temperature extremes and day-to-day variability in Japan, papers in Meterology and Geophysics, pp. 63-72.
Gong, D. Y., & Ho, C. H. (2002), The Siberian High and climate change over middle to high latitude Asia. Theoretical and applied climatology, 72(1), 1-9.
Ninomiya , K, Nishimura T, Suzuki T, Matsumura, S (2006), Polar-air outbreak and air-mass transformation over the east coast of Asia as simulated by an AGCM. J Meteor Soc Japan No. 84: 47–68.
Park T.W. Ho C.H. Yang S. 2011, Relationship between the Arctic Oscillation and Cold Surges over East Asia, Journal of Climate, 24, 63-83.