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(ESS220) Earth System Climatology

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(ESS220) Earth System Climatology Earth System Climatology (ESS220) Course Time Lectures: Tu, Th 9:30-10:50 Discussion: 3315 Croul Hall Text Book The Earth System, Kump, Kasting, and Crane, Prentice-Hall Grade Homework (40%), Final (60%) Homework Issued and due every Tuesday ESS220 Prof. Jin-Jin-YiYi Yu Course Description This course offers an overview of Earth's climate system by describing the major climatological features in the atmosphere and oceans and by explaining the physical principals behind them. The course begins with an introduction of the global energy balance that drives motions in the atmosphere and oceans, then describes the basic structures and general circulations of the atmosphere and oceans, and finally look into major climate change and variation phhenomena. ESS220 Prof. Jin-Jin-YiYi Yu Syllabus ESS220 Prof. Jin-Jin-YiYi Yu Earth Climate System Solar forcing thousands of years ((,23K, 41K, 100k) Atmosphere days ~ weeks months ~ 1-2 seasons 1000 years Ocean Land Solid Earth millions of years Energy, Water, and Biochemistry Cycles ESS220 Prof. Jin-Jin-YiYi Yu Circulation of the Solid Earth From The Blue Planet Cold Lithosphere The rising hot rocks and slid-away flows are thought to be the factor that control the positions of ocean basins and continents. Î The convection determines the shape of the Earth. ESS220 Prof. Jin-Jin-YiYi Yu Lecture 1: Atmosphere Composition Composition Origin and Evolution Vertical Structure (from Understanding Weather & Climate) ESS220 Prof. Jin-Jin-YiYi Yu Thickness of the Atmosphere (from Meteorology Today) The thickness of the atmosppyhere is only about 2% 90% of Earth’s thickness (Earth’s 70% radius = ~6400km). Most of the atmospheric mass is confined in the lowest 100 km above the sea level. Because of the shallowness of the atmosphere, its motions over large areas are ppyrimarily horizontal. ÎTypically, horizontal wind speeds are a thousands time greater than vertical wind speeds. (But the small vertical displacements of air have an important impact on the state of the atmosphere.) ESS220 Prof. Jin-Jin-YiYi Yu Vertical Structure of the Atmosphere composiiition temperature electricity 80km (from Meteorology Today) ESS220 Prof. Jin-Jin-YiYi Yu Vertical Structure of Composition up to ~500km Dominated by lighter gases Heterosphere with increasing altitude, such as hydrogen and helium. ~80km This part of the atmosphere continually circulates, so that the principal atmospheric Homosphere gases are well mixed. Î For most purpose, we consider the homosphere virtually the entire athtmosphere. ESS220 Prof. Jin-Jin-YiYi Yu Ionosphere and AM Radio The D- and E-layers absorb AM radio, while the F -lay er reflect radio waves. When night comes, the D-layer disappears an d t he E-layer weakens. Radio waves are able to reach the F-layer and get reflected further. The repeated refection of radio waves between Earth surface and the F-layer allows them to overcome the effect of Earth’s curvature. (from Understanding Weather & Climate) ESS220 Prof. Jin-Jin-YiYi Yu Composition of the Atmosphere (inside the DRY homosphere) Water vapor (0-0.25%) (from The Blue Planet) ESS220 Prof. Jin-Jin-YiYi Yu Origins of the Atmosphere When the Earth was formed 4.6 billion years ago, Earth’s atmosphere was probably mostly hydrogen (H) and helium (He) plus hydrogen compounds, such as methane (CH4) and ammonia (NH3). Î Those gases eventually escaped to the space. The release of gases from rock through volcanic eruption (so -called outgassing) was the principal source of atmospheric gases. Î The primeval atmosphere produced by the outgassing was mostly carbdiid(bon dioxide (CO2)ih) with some Nitrogen (N2)d) and water vapor (H2O), and trace amounts of other gases. ESS220 Prof. Jin-Jin-YiYi Yu What Happened to H2O? The atmosphere can only small fraction of the mass of water vapor that has been injected into it d uri ng vol cani c erupti on, most of the water vapor was condensed into clouds and rains anditd gave rise to oceans. Î The concentration of water vapor ihin the atmosp here was substantially reduced. (from Atmosppyyheric Sciences: An Introductory Survey) ESS220 Prof. Jin-Jin-YiYi Yu Saturation Vapor Pressure Saturation vapor pressure describes how much water vapor is needed to make the aittdtir saturated at any gi ven t emperat ure. Saturation vapor pressure depends ppyrimarily on the air tem perature in the following way: The Clausius-Clapeyron Equation Î Saturation pressure increases exponentially with air temperature. ESS220 L: latent heat of evaporation; α: specific volume of vapor and liquid Prof. Jin-Jin-YiYi Yu What happened to CO 2? Chemical weather is the primary process to remove CO2 from the atmosphere. Î In this process , CO2 dissol v es in rainwater producing weak carbonic acid that reacts chem ica lllly with b ed rock and produces carbonate compounds. This process re duce d CO2 in t he (from Earth’s Climate: Past and Future) atmosphere and locked carbon in rocks and mineral. ESS220 Prof. Jin-Jin-YiYi Yu Carbon Inventory (from Atmospheric Sciences: An Introductory Survey) ESS220 Prof. Jin-Jin-YiYi Yu What Happened to N 2? Nitrogen (N2): (1) is inert chemically, (()2) has molecular sp eeds too slow to esca pe to s pace , (3) is not very soluble in water. ÎThe amount of nit rogen b ei ng cycl ed out of th e at mosph ere was limited. ÎNitrogen became the most abundant gas in the atmosphere. ESS220 Prof. Jin-Jin-YiYi Yu Where Did O2 Come from? Photosynthesis was the primary process tito increase the amoun tft of oxygen in the atmosphere. Î Primitive forms of life in oceans began to produce oxygen through photosynthesis probably 2.5 billion years ago . Î With the concurrent decline of CO2, oxygen became the second most abundant atmospheric as after nitrogen. (from Earth’s Climate: Past and Future) ESS220 Prof. Jin-Jin-YiYi Yu Where Did Argon Come from? Radioactive decay in the planet’s bedrock adde d argon (Ar)t) to th e evol vi ng at mosph ere. Î Argon became the third abundant gas in the atmosphere. ESS220 Prof. Jin-Jin-YiYi Yu Formation of Ozone (O3) With oxygen emerging as a major component of the atmosphere, the concentration of ozone increased in the atmosphere through a photodissociation process. ESS220 Prof. Jin-Jin-YiYi Yu (from WMO Report 2003) Ozone (O3) “good” ozone ~ 15ppm “bad” ozone ~ 0. 15ppm (from WMO Report 2003) ESS220 Prof. Jin-Jin-YiYi Yu Other Atmospheric Constituents Aerosols: small solid particles and liquid droplets in the air. They serve as condensation nuclei for cloud fiformation. Air Pollutant : a gas or aerosol produce by human activity whose concentration threatens living organisms or the environment. ESS220 Prof. Jin-Jin-YiYi Yu Air Pressure Can Be Explained As: weight of the air motion of air molecules The weight of air above a surface The bombardment of air molecules (due to Earth’s gravity) on a surface (due to motion) ESS220 Prof. Jin-Jin-YiYi Yu Air Pressure and Air Density Weight = mass x gravity Density = mass / volume Pressure = force / area = weight / area ESS220 (from Meteorology Today) Prof. Jin-Jin-YiYi Yu How Soon Pressure Drops With Height? Ocean Atmosphere (from Is The Temperature Rising?) In the ocean, w hihhhich has an essenti tillally const ant density, pressure increases linearly with depth. In the atmosphere , both pressure and density decrease exponentially with elevation. ESS220 Prof. Jin-Jin-YiYi Yu One Atmospheric Pressure The averaggpe air pressure at sea level is equivalent to the pressure produced by a column of water about 10 meters (or about 76 cm of mercury column). This standard atmosphere pppressure is often expressed as 1013 mb (millibars), which means a pressure of about 1 kilogram per square centi met er. (from The Blue Planet) ESS220 Prof. Jin-Jin-YiYi Yu Units of Atmospheric Pressure Pascal (Pa): a SI (Systeme Internationale) unit for air pressure. 1P1 Pa = a force of f1 1 newton acti ng on a surf ace of one square meter 1 hectopascal (hPa) = 1 millibar (mb) [hecto = one hundred =100] Bar: a more popular unit for air pressure. 1 bar = a force of 100,000 newtons acting on a surface of one square meter = 100,000 Pa = 1000 hPa = 1000 mb One atmospppheric pressure = standard value of atmospppheric pressure at lea level = 1013.25 mb = 1013.25 hPa. ESS220 Prof. Jin-Jin-YiYi Yu Units of Air Temperature Fahrenheit (ºF) Celsius (ºC) Î ºC = (ºF-32)/1.8 Kelvin (K): a SI unit Î K= ºC+273 1K1 K = 1 ºC>1C > 1 ºF ESS220 Prof. Jin-Jin-YiYi Yu Vertical Thermal Structure Troposphere (“overturning” sphere) contains 80% of the mass Standard Atmosphere surface heated by solar radiation strong vertical motion where most weather events occur Stratosphere ((y“layer” sp here) weak vertical motions dominated by radiative processes heated by ozone absorption of solar ultraviolet (UV) radiation warmest (coldest) temperatures at summer (winter) pole Mesosphere heated by solar radiation at the base heat dispersed upward by vertical motion (from Understanding Weather & Climate) Thermosphere very littl e mass lapse rate = 6.5 C/km ESS220 Prof. Jin-Jin-YiYi Yu Variations in Tropppopause Hei ght (from The Atmosphere) ESS220 Prof. Jin-Jin-YiYi Yu Dry Adiabatic Lapse Rate (from Meteorology: Understanding the Atmosphere) ESS220 Prof. Jin-Jin-YiYi Yu Moist Adiabatic Lapse Rate (from Meteorology: Understanding the Atmosphere) ESS220 Prof. Jin-Jin-YiYi Yu Stratosphere Standard Atmosphere The reasons for the inversion in the stratosphere is due to the ozone absorption of ultraviolet solar energy. Although maximum ozone concentration occurs at 25km, the lower a ir d ensi ty at 50k m a llows solar energy to heat up temperature there at a much greater degree.
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