ATMO 336 1st Edition Lecture 23Outline of Last Lecture II. Ozonea. Good ozone vs. bad ozoneIII. Summary for stratospheric ozone depletiona. CFC’sb. Measured loss of stratospheric ozonec. The ozone “hole”IV. Dangers of UV radiationa. Classes of radiationV. Effects of UV exposure on skina. Melenaoma and skin cancerI. UV protectionOutline of Current Lecture VI. Weather vs. climatea. Defining bothb. Examples of important climate statisticsc. Tucson vs. san diegoVII. Intro to climate changeVIII. Climate changeCurrent Lecture- Weather vs climateo Weather= moment by moment and place by place description of the state of the atmosphere, with events taking place on a small scale o Climate= encompasses the totality of all weather conditions (in a given region) accumulated over a long period of time (over 30 year period) Average weather for a given area (highs and lows of precipitation used by national weather service) Sum of all statistical weather info that helps describe a place or region with averages and standard deviations about the averageo Examples of important climate statistics Average number of days per year below freezing temps Average date of last forst Variations in type and amount of cloudiness Frequency of flooding rains Frequency of droughtsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. Average number of days per years with temps above 100 Timing of precipitation during year (rainy summers, dry winters or dry summers ,rainy winters)o Tucson vs san diego= have similar climates , but Tucson has much more variation in temperature throughout year (hotter in summer, colder in winter) and san diego gets most of its rain in winter and very little in summer (Tucson gets more rain in summer)- Intro to climate changeo Climate change is NORMAL and part of earths historyo In order for it to occur, changes would have to take place over many years and there must be a measurable change in frequency of extreme events over a prolonged periodo Global warming= increase in global average surface temp of eartho We can measure changes in average temp with some accuracy, but we cannot determinevery well how much the temperature change is due to human activities and how much ispart of a natural fluctuation not related to human activityo Many human activities may contribute to global warming or other climate changes, such as emissions of greenhouse gases or land use (deforestation)o Global warming and the ozone hole are not the same thing (separate environmental issues)- Climate changeo Any significant shift in the atmospheric component of the climate system, which occurs at the spatial scale of a regionally- defined climate zoneo To understand climate change, we need to focus on smaller regions (koppen map of world climates)o We define climate changes as occurring on small regional scales, like a moderately sized ecosystem, as opposed to the entire planet eartho Largest percentage change in temp. are for those temps that happen on both extremes of the distribution (large percentage increase in extremely warm days and large percentage decrease in extremely cold
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