Sadegh Karimi Khajehlangi
Volume 21, Issue 83 , November 2012, , Pages 73-76
Abstract
The relation between ENSO and fluctuations in monthly precipitation patterns of Iran
ENSO phenomenon is a combination of El Nino-Southern Oscillation and an important telecommunication patterns in southern hemisphere which affect weather condition all over the globe through changing temperature and ...
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The relation between ENSO and fluctuations in monthly precipitation patterns of Iran
ENSO phenomenon is a combination of El Nino-Southern Oscillation and an important telecommunication patterns in southern hemisphere which affect weather condition all over the globe through changing temperature and precipitation patterns.
Different researchers have studies the influence of this phenomenon on temperature and precipitation patterns of different areas of the world, including Iran in different cold and hot phases and found significant differences. Different areas react differently to ENSO with different time lags. Thus, the present article studies the relation between ENSO and seasonal/monthly precipitation in Shahr-e Kord.
The present article analyzes the relation between these patterns through a 44 year period (1957-2000) of precipitation in Shahr-e Kord synoptic station and temperature anomaly in Nino 3.4 region. Results indicate that Shahr-e Kord precipitation pattern during the mentioned period in May, June, August, October and November is related with ENSO, yet the level of this relation differs. Therefore, the correlation between ENSO and Shahr-e Kord monthly precipitation pattern is more significant in June, May (spring season), October, and November (autumn). According to the findings, we recognized a negative correlation between ENSO and precipitation in Shahr-e Kord. Results indicate that the most significant relation is between temperature anomaly in Nino 3.4 and Shahr-e Kord precipitation with a four month lag.
Hamid Enayati; Shima Toori
Volume 19, Issue 74 , August 2010, , Pages 75-80
Abstract
In recent years the use of aerial laser scanners for determining the topography of water beds has been introduced in the world and has found practical aspect. Depth measurement using laser scanners is a more precise, cost- efficient, and faster method than other depth-measuring methods, which is based ...
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In recent years the use of aerial laser scanners for determining the topography of water beds has been introduced in the world and has found practical aspect. Depth measurement using laser scanners is a more precise, cost- efficient, and faster method than other depth-measuring methods, which is based on accurate measurement of the travel time of two light signals transmitted to the surface and bed of water. Consequently, the use of appropriate hardware and software, in which the source of the major errors is detected and minimized, is very effective on the result of the flight. This paper presents a variety of depth-measuring laser scanners, various techniques used in each of them, and a description of how depth-measuring operations are performed. In addition to expressing the natural causes of error as well as noise causes in operational data, an algorithm for data correction and a method for noise cancellation is presented.
