Air pressure is measured with an instrument called a mercury barometer or the aneroid barometer. On maps, places of equal atmospheric pressure are joined together by lines called ISOBARS. Meaning of Atmospheric Pressure Atmospheric pressure is the weight of the volume of air which extends from the ground surface to the outermost …
Atmospheric circulation definition Atmospheric circulation is referred to as the large scale movement of air at levels of the atmosphere by which heat is circulated on the surface of the Earth; this is also referred to as the different amount of insolation absorbed by the earth which causes differential heating of the …
Tornadoes Facts Tornadoes are the most violent of all the storms, capable of picking up trees, cars, roofs and walls of buildings. Tornadoes generally occur in middle latitudes. They are very small in size and of short duration which makes weather prediction difficult. Tornados funnel can have the size of 90-460m in …
Definition of tropical cyclones Tropical cyclones are violent storms that originate over oceans in tropical areas and move over to the coastal areas bringing about the large scale of destruction caused by violent winds, very heavy rainfall and storm surges. This is known as one of the most devastating natural disasters in …
Definition of anticyclones Anticyclone which is commonly known as high is a wind system which has highest air pressure at the centre and lowest at the outer margin and winds blow from the centre outward in clockwise direction in the northern hemisphere and anticlockwise in the southern hemisphere; anticyclones are high-pressure systems …
Climate change at the global scale Most modeling of the effect of climate change has focused on malaria (Marten and Lefebvre, 1995; Rogers and Randolph, 2002). A recent paper has estimated the potential impact on the global distribution of dengue (Hales et al.,2002). But the potential impact of climate change on other …
Temperatures over the past 10years clearly were the warmest since measured records have been available (Stefan et al., 2003). The year 1998 sticks out well above the long-term trend due to the occurrence of major El Nino events that year (the last El Nino so far and one of the strongest on …
What Is Atmosphere? The atmosphere is the gaseous layer that surrounds the earth and marks the transition between its surface and space, It is made up of numerous gases such as nitrogen , oxygen and carbon dioxide etc. Some scientists stated that the atmosphere i s about 35 years old; its thickness …