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Investigation of blocking trend in Siberian and Azores high pressuresystems in the meteorology of the Iranian plateau

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Type: Conference paper
Language: English
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ARMANI01_048

Index date: 28 February 2022

Investigation of blocking trend in Siberian and Azores high pressuresystems in the meteorology of the Iranian plateau abstract

Atmosphere is a fluid that any imbalance in any part of it leads to the movement of matter to eliminatethe imbalance and create balance in the atmosphere. Daily observations, a constant and constant flow ofmolecules (matter) in the direction It shows the balance of forces. If the air is disturbed at some point, anew flow of matter and energy takes place immediately. Otherwise, there will be a sharp difference in thedistribution of heat and moisture on the earth's surface. Such a thing is possible in the atmosphere. It is notpossible. The paradoxical role is the ability to rotate around an axis. The relative equilibrium is themagnitude of the rotation of a fluid about an axis perpendicular to the earth's surface. Therefore, the fluidpassing through the curved path has a fineness, provided that the radial arrangement does not eliminate itstangential velocity. This fineness is called the relative curvature velocity. Barotropic atmospheres areatmospheres whose density depends only on pressure, so isobaric surfaces are surfaces that have a constantdensity. For ideal gases, if the atmosphere is barotropic, the isobaric surfaces will be the same as isothermalsurfaces. it works . Thus, barotropy exerts a very strong position on rotating fluid motions. Conversely,when the vertical distributions of pressure and temperature do not match, or on atmospheric maps, curvesof the same height intersect with isothermal lines, the atmosphere is called barometric or baroclinic. In thiscase, the winds intersect the isothermal curves of either height or thickness. In an atmosphere where densitydepends on both temperature and pressure, the atmosphere becomes baroclinic. The arrangement dependson the horizontal temperature gradient (according to the thermal wind formula). Baroque clinkingatmosphere is very important in dynamic meteorology and meteorology. Turkmenistan is witnessing a tenseatmosphere with warm advection. In this study, standard rainfall (SPI) data of 1974-2014 drought and wetseason were extracted. 1999 was selected as the driest year and 1982 as the wetland sample. Synoptic mapsat 4 levels of sea level pressure, hectopascal meter height in January, February, March, April, November,and December, at the levels of 1000, 850, 700 and 500 geopotential meters were identified and analyzed.Examination of the central seal closed during the 12 months of 1999 rainfall, at different levels on a monthlybasis at different levels, showed that it was closed at the level of 500 hPa at 0.99 hPa. Thus, 1999, when thedrought was more severe, and 1982 had the wettest period of this 40-year period (1974-2014), with a higherpercentage of the center and spin closures closed. Other results indicate that the axis of rotation over aridregions in 1999 and 1982 was east-west. This situation is more seen in the combination of the Siberianand Azores and the Tibetan high plateau.

Investigation of blocking trend in Siberian and Azores high pressuresystems in the meteorology of the Iranian plateau Keywords:

TREND .BAROCLING .SIBERIAN PRESSURE SYSTEM. Azores. Meteorology . Plateau of Iran

Investigation of blocking trend in Siberian and Azores high pressuresystems in the meteorology of the Iranian plateau authors

Abbas Kashani

Ph.D. in Climatology at Mohaghegh Ardabili University. Ardabil, Iran. (Corresponding author)

Zahra Arabi

PhD in Natural Geography. Associate Professor at Payame Noor University, Tehran, Iran

Gholam Abbas Fallah Ghalhari

Professor and Ph.D Synoptic Climate, Associate Professor of Hakim Sabzevari, Iran

Bromand Salahi

Professor and Ph.D Synoptic Climate, University of Mohaghegh Ardabili, Ardabil, Iran