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Lecture 12

Lecture 12 - Storms.docx

4 Pages
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Department
Earth Sciences
Course Code
EARTHSC 2GG3
Professor
Sergei Basik

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Description
Lecture 12 StormsThunder Lightning Hail Tornadoes and Dust Weather ClimateEXAM QUESTION What is the difference between weather and climateWeather refers to the daytoday changes in atmospheric conditions temperature precipitation Climate is the longterm statistical average of weather conditions assessed using at least 30years of dataAlso includes longterm precipitation patternYou can get same weather in 2 different climates Adiabatic CoolingAdiabatic cooling occurs when rising air cools as it expands without change in heat content For dry air the cooling rate is 100C for every 1000mAmount of heat stays Adiabatic Lapse RatesThe saturated adiabatic lapse rate is less than the dry adiabatic lapse rate due to the release of latent heat during condensation Different if you have moisture in air and when you dontConvection Heating of the Earths surface leads to rapidly rising parcels of air convection with subsequent condensation and cloud formation Winds and Pressure GradientsHigh pressure systemprevents warm air from risingclear skiesLow pressure systemwarm air risescloudyicelanding low pressure Siberian high pressure Bermuda high pressure Pacific High pressurehigh pressureequatorJulyhigh pressuremoves south JetstreamsGeneralized pattern of global circulation with the typical jet stream locations shown at 60deg and 30degPolar CellNorth Pole Storms occur between two different temperature currents cells
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