GEOG 1111, Week 1 Notes
GEOG 1111, Week 1 Notes GEOG 1111
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This 21 page Class Notes was uploaded by Marisa Evans on Wednesday February 3, 2016. The Class Notes belongs to GEOG 1111 at University of Georgia taught by Hopkins in Spring 2016. Since its upload, it has received 43 views. For similar materials see Introduction to Physical Geography in Geography at University of Georgia.
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Date Created: 02/03/16
Introduction to Geography/Physical Geography; Latitude and Longitude - 01/12/16 Test questions come from BOLD or UNDERLINED or ITALICIZED notes. No required textbook; only from lecture notes. GEOGRAPHY isthe study and analysis of the spatial and temporal distribution of phenomena on the Earth’s surfac, and the underlying processes which cause the observed pattern. Where are these phenomena, what is their pattern, but more importantly, why is the pattern the way it is, what causes it. * The spatial science of areas, natural systems, & human-made systems. Five Fundamental Themes of Geography : Location can be both absolute and relativ. It is thspatial component of geography , the being concerned with where things are. absolute : latitude & longitude, or GPS coordinates relativ: comparing one location to another by the distance between them as measured in either time or miles (kms) Place refers to those characteristics that make a location uniqu. EX: What makes Athens, GA diﬀerent from Athens, OH. Movement is the what, how, where and why of the diﬀusion of organisms and physical events across the Earth’s surfac. EX: The migration of people, a hurricane, etc. Regions refers tothe study of areaswith uniform or similar cultural and/or physical characteristics. EX: North America vs. South America, etc. Human-Earth Relationships looks at the impacts of the environment on people & their impact on the environment. It is the relationship between human societies & their environment. EX: The impacts of deforestation, human pollution, agriculture, etc.; the relationship between the environment & human technological development; Levee break in New Orleans. 3 Main Sub-disciplines or areas in Geography Physical Geography : non-human-made patterns ) Biogeography, Geomorphology, Climatology, Hydrogeography, Soils geography Human/Cultural Geography : human-made patterns ) Economic, Political, Historical, Cultural, Urban, Population, etc. Techniques : the tools of geography) Cartography, Remote Sensing, Aerial Photography, Geographic Information Systems/Science (GIS) In this course we are concerned primarily with Physical Geography . * As an area of study, Geography is quite old. * Eratosthenes , a Greek who lived from 275 to 195 B.C., is considered one of the ﬁrst “geographers”. * He measured the polar circumference of the Eart. * He became an accomplished cartographer or map-maker. * He developed the idea of environmental zones based on temperature (Tº). ** Some other early geographers: * Greek scholars: Aristotle, Hipparchus * Roman scholars: Strabo, Ptolemy * Muslim scholars: Edrisi, ibn-Batuta * Chinese scholars: Phei Hsiu, (Chinese geographical study has been dated as far back as the 5th cent. B.C.) ** More recent geographers: * Alexander von Humboldt , (1769-1859), considered by some the “father” of modern physical geography. * credited with bringing “scientiﬁc study” to physical geography * Vladimir Köppen(Koeppen ) (1846-1940), developed the Köppen Classiﬁcation System for climates based on vegetation, temperature & precipitation patterns. * Alfred Wegner (1880-1930), developed the Theory of Continental Drift which later became part of the theory of Plate Tectonics. * Charles Thornthwaite (1899-1963), developed another climate classiﬁcation system based on the principle of water balance, precipitation & potential evapotranspiration. * Tetsuya Theodore Fujita(1920-1998), developed the Fujita Scale for measuring the intensity of tornadoes. * Robert Simpson (1915- ), developed, along with Herbert Saﬃr, the Saﬃr-Simpson Scale for measuring hurricane intensity. * Marshall Shepherd, an American meteorologist, professor in the UGA Department of Geography * Some other prominent Physical Geographers or related scholars: Climate: Tim Oke, Lonnie Thompson, Russ Mather, Roger Barry, James Hansen, Syukuro Manabe, Joanne Simpson Geomorphology : James C. Knox, Stanley Trimble, Luna Leopold, Stanley Schumm, Gordon Wolman, Karl Butzer, Carol Harden Biogeography : Tom Veblen, Jarrod Diamond, Glen MacDonald, Eugene & Howard Odum EARTH’S SPHERES Atmosphere is the thin gaseous veil which surrounds the Ear.h * From sea level to about 60,000 km (37,000 mi) above surface. * This is where weather occurs, our air supply is, etc. Hydrosphere is all the water above, on, and in the Earin all three (3) states (solid, liquid, gas), freshwater, saline (saltwater), and in-between. * It comprises some 71% of the Earth’s surface, primarily as oceans. * Vital for most living organisms, many weather and many geomorphic processes. Lithosphere is the Earth’s crusand a portion of the upper mantle. * It is the rocky, outer shell of the planet, both land (continents) and the sea bottom. Biosphere allthe living organisms of the planet and the interconnections between them and their physical environment. SYSTEMS : It’s common to study “systems” or all the factors inﬂuencing an area or particular phenomena. EX: a ﬂuvial (river) system, a thunderstorm or hurricane system, an ecosystem, etc. Two Basic Types : Open System is where the boundaries or interfaces between parts of the system AND other systems allows for the free transfer of energy and matter across them. EX: a weather system, river drainage system, an ecosystem Closed System is self-contained exhibiting no exchange of energy or matter across boundaries. Systems change, they are dynamic, but tend to be in, or in the process of being in some form of an equilibrium stat. Equilibrium Stateis the changing, or relatively non-changing conditions of a system. All systems will change over time, but at diﬀerent rates, thus some are seemingly in equilibrium while may be moving toward a state of equilibrium. Steady-state Equilibriumis when a system is in balance over time, is neither growing nor contracting but is in full operation. May exhibit small oscillations around an average level or condition however. Dynamic Equilibrium is when a system exhibits wide ﬂuctuates around an average value, and in which the average demonstrates a trend over time. Feedback Mechanism is a process by which when the normal operations of a system cause a portion of the system’s output to be returned as information input. This may cause changes which guide further system operations. What happens in one part of a system has an eﬀect on other par.s Two types of Feedback Mechanisms: Negative Feedback tends to slow or reduce responses in a system and promotes self-regulation of the syste. This tends to keep the system in its original condition,inhibiting chang. EX: a large mass of ice keeps the air above it cold, which keeps the ice cold, which keeps the air cold, keeping the ice cold, ….. Positive Feedback tends to amplify or encourage responses in a system. It induces progressively greater changes in other parts of the system. What might be termed the “snowball eﬀect”. EX: growth of a hurricane; the system draws into it warm, moist air oﬀ an ocean which causes it to grow, drawing in more warm, moist air, causing it to grow, drawing in even more air, ... LATITUDE & LONGITUDE Earth is a sphere or has a spheroidal shape. But it actually bulges at the Equator or more accurately has a geoidal bulge at the Equator. Equatorial diameter: 12,756 km = 7926 mi (24,902 mi circum.) Polar diameter: 12,714 km = 7900 mi (24,860 mi circum.) To locate places on the surface we use a grid system. Several types have been developed and are in use. Most common or well known is the latitude and longitude grid system. Latitude are the lines that run East-West, are parallel and are measured North-South, starting at 0º (the Equator), and ending at 90º (the N & S Pole). You cannot have a latitude over 90 degrees. Longitude are the lines that run North-South, are non-parallel and are measured East-West, starting at 0º (the Prime Meridian), and ending at 180º (the International Date Line). * A degree is part of a circle, with 360 parts or degrees in a complete circle. * A degree can be further sub-divided into 60 equal parts or minutes and a minute is further sub-divided into 60 equal parts or seconds. EX: 30º 35' 15" N 87º 55' 30" W Latitude must have a N or S after it for north (N) or south (S). Longitude must have an E or W for east (E) or west (W). Know the major lines of latitude and longitude: Latitude: Equator, Tropic of Cancer, Tropic of Capricorn, (0°) (23.5° N) (23.5° S) Arctic Circle, Antarctic Circle, North Pole, South Pole (66.5° N) (66.5° S) (90° N) (90° S) Longitude: Prime Meridian, International Date Line (0°) (180°) We write latitude ﬁrst and then longitude: 12º 35' 15" N 104º 55' 30" E NOT 104º 55' 30" E 12º 35' 15" N * The Earth’s rotation and the Meridians of Longitude determine the Time Zones. * 1 time zone is 15º of longitude360º/24hr (1 day) = 15º/h │9am │ 10am │ 11am │ 12pm │1pm │2pm │3pm │ -----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|----- 45ºW 30ºW 15ºW 0º 15ºE 30ºE 45ºE Rio de Iceland London Berlin Istanbul Moscow Janeiro Dakar Paris Rome Cairo MAP PROJECTIONS * There are problems with transferring a round object, the globe (Earth), onto a ﬂat surface, a piece of paper, or a computer screen. Distortion of the physical size and shape will often be present. * This can be done by an orderly arrangement of crisscrossing lines, parallels of latitude and meridians of longitude. * Several methods of showing or projecting the Earth's surface have been devised and thus several diﬀerent map types and projections are in use. * Mercator (one of the most common types used, esp. for large wall maps). * conic * cylindrical * planar * equal-area * polar * gnomonic * The Scale of a map, the ratio of distance on the map to the actual distance on the ground, is also important. The amount of detail a map can display will vary with the scale. EX: 1:24,000 is a representative fraction which means that 1 inch on the map equals 24,000 inches on the ground (2000 feet). A Large Scale map shows a relatively small area of the Earth’s surface and thus more detail. 1:1000000 means 1 inch on the map equals 1 million inches on the ground (or 83,333.33 feet or 15.78 miles). A Small Scale map shows a relatively large area of the Earth’s surface and thus less detail. Earth/Sun Relationships; Structure of the Atmosphere; Radiation Balance - 01/14/16 EARTH/SUN RELATIONSHIPS ** Greater than (>) 99% of Earth’s energy is from the Sun. * The amount (intensity) of sunlight striking the Earth varies spatially (over space or area) with latitude. AND varies temporally (over time) with the seasons (day length) and between day & night. * These variations cause an unequal heating of the Earth’s surface which drives the ocean currents, forms wind, which in turn transports energy across the globe. Earth Movements Rotation is the spinning of the Earth on its axis. It makes one (1) turn about every 24 hours deﬁning day & night. Thus the same side of the planet is not always facing the Sun and solar intensity varies. * The Earth turns counterclockwise, when viewed above the North Pole and the atmosphere rotates with the Earth, held by force of gravity. * A circle of illumination forms between the area of light (daytime) & dark (nighttime). Revolution is the movement of the Earth in its orbit around the Sun. It makes one orbit every 365.2422 days (365 days, 5.8 hrs.), commonly called 1 calendar year. * It is a counterclockwise orbit, when viewed above the North Pole. * The orbit is elliptical, so at one time of the year it is closer to the Sun than the opposite end of the orbit and solar intensity varies. These 2 points are known as: Perihelion when the Earth & Sun are closest to each other, (about 1.47 X 108 km or 91,500,000 miles apart), which occurs on January 4. Thus a little higher solar intensity. Aphelion when the Earth & Sun are the furthest apart, (about 1.52 X 108 km or 94,500,000 miles apart), which occurs on July 4. Thus a little lower solar intensity. Earth’s Seasons Why they occur: * Revolution * Rotation * Tilt of the Earth on its Axis (23.5 degrees) * Axial parallelism * Sphericity * Earth’s seasons are due to the Earth’s orientation to the Sun & thus the varying angle the Sun’s rays strike the Earth’s surface. * Earth’s orientation to the Sun is a result of the tilt on its axis or the inclination of the axis, currently 23.5º from a perpendicular to the plane of the ecliptic. Its Revolution around the Sun and its daily Rotation on its axis are also major factors. * The Earth’s axial parallelism or the orientation of the North Pole of the Earth toward a speciﬁc star and the fact that the Earth is a sphere (its sphericity) are also factors controlling solar intensity at the surface. (Three of these factors, inclination of the axis, axial parallelism, and the shape of the Earth’s orbit (revolution), change over long periods of time.) Winter Solstice - December 21-22 Vernal Equinox - March 20-21 Summer Solstice - June 21-22 Autumnal Equinox - September 22-23 ** This can be seen by the varying solar intensity with day length & with varying seasons. * Summer has longer days, with a higher solar altitude, & thus more intense sunlight and more energy. * Winter is essentially the opposite of summer, shorter days with a lower solar altitude & thus less intense sunlight and less energy. * Solar Altitude (SA) is the angle of the Sun above the horizon at any given latitude. EX: At a SA of 90º, the sun is “directly overhead”, and thus yields the potentially maximum solar intensity. Will only be 90 degrees in the tropics (Tropic of Cancer, Tropic of Capricorn) Solstices & Equinoxes * The ﬁve factors above cause the seasons, with 4 days of particular interest: the 2 Solstices & the 2 Equinoxes. Astronomical Seasons ** March Equinox Mar 21 – 22 (start of Spring in Northern Hemisphere & start of Fall in Southern Hemisphere) ** June Solstice Jun 21 – 22 (start of Summer in NH & start of Winter in SH) ** September Equinox Sep 22 – 23 (start of Fall in NH & start of Spring in SH) ** December Solstice Dec 21 – 22 (start of Winter in NH & start of Summer in SH) (Know the months for each of these events and for each hemisphere.) * The Sun is never directly overhead (SA = 90º) outside 23.5º N or S latitude (the Tropic of Cancer & Capricorn). * The northern hemisphere winter = southern hemisphere summer, etc. Climatological Seasons: (Also know these for the NH only.) Winter: Dec, Jan, Feb Spring: Mar, Apr, May Summer: Jun, Jul, Aug Fall: Sep, Oct, Nov WEATHER vs CLIMATE ** The day-to-day ** The statistical properties of the conditions of the atmosphere, including measures of the Atmosphere. average conditions, variability, etc. over long periods of time. ** constantly changing ** slow, long-term changes ** The state or condition of the ** A description of aggregate atmosphere at a particular weather conditions. time and place. ** Comprised of various factors: ** A sum of the daily and seasonal air pressure, air temperature, weather events over decades, humidity, clouds, precipitation, hundreds or thousands of years wind, visibility, etc. (averages of these factors). Meteorology: The science that studies the atmosphere and its processes on a short-term basis. Climatology: The study of long-term atmospheric conditions. ORIGIN OF THE ATMOSPHERE A B C D --|------------------------------------|------------------------------|------------- ------- 4.5 billion 3 - 1.5 bya .5 bya years ago (bya) A: Earth formed and hot gases escape (the process of outgassing). B: Earth cooled and gases accumulate. Atmosphere comprised mainly of CO (carbon dioxide), N (nitrogen), & methane. 2 2 Little to no2O (oxygen) or3O (ozone). C: Oxygen generated aquatic organisms evolve and oxygen supply slowing rises. D: Green land plants widespread and the atmosphere has taken on its basic present conditions. Ozone levels increase and spread. ** Main process for increased oxygen levels is photosynthesis. ** Ozone layer helps to protect from unwanted solar radiation. Decreases the intensity. COMPOSITION OF THE ATMOSPHERE * The atmosphere is a mixture of discrete gases, with solid & liquid particles suspended within it. Some components are fairly stable while others vary spatially and/or temporally. Constant Gases are those found in the same proportions (%) within the lower atmosphere (up to 50 miles altitude). Variable Gases are those present in diﬀering amounts spatially and/or temporally within the lower atmosphere. Constant Gases: 3 gases make-up just under 100% of the atmosphere Nitrogen (N): ~ 78% Oxygen (O ): ~ 21% 2 Argon (Ar): ~ .9% Variable Gases: 4 which inﬂuence weather and life systems Carbon dioxide (CO )2 Water vapor (H 2) Ozone (O ) Methane (CH ) 3 4 Carbon dioxide & Methane are 2 of the “Greenhouse Gases” which help absorb & reﬂect long wave or terrestrial radiation (heat energy) emitted by the Earth, and thus help regulate surface temperatures. Water vapor, also a “Greenhouse Gas”, is quite variable throughout the atmosphere, ranging from about 4% by volume in tropical areas to < 1% in some deserts. * It is the source material for cloud formation and precipitation. * It also absorbs radiant energy and helps regulate surface temperatures and is important in energy transfer within the atmosphere. * Water is only substance found in all 3 states (solid, liquid, gas). Carbon dioxide, methane, water vapor and nitric oxides are all known as the “Greenhouse Gases”. Ozone is NOT a greenhouse gas, but does aﬀect the atmosphere. If you have less ozone, it can have an aﬀect on temperatures. Ozone is concentrated in the stratosphere (10 - 50 km above the surface) in amounts of < .00005% by volume of the atmosphere. * It is not a greenhouse gas, but does absorb damaging ultraviolet (UV) radiation coming from the sun. * It is important not only because it helps block-out some of the UV radiation which is harmful to living organisms, but this also helps regulate surface T°s. ** OZONE “HOLE” * The commonly called phenomena of an “Ozone Hole” around the Earth’s Polar Regions is really a seasonal depletion of ozone in the stratosphere. This is thought to be caused by increased amounts of chloroﬂuorocarbons (CFC’s) in the stratosphere because the chlorine atom of the CFC molecule has been shown to break apart ozone molecules. * Some research suggests that a 1% loss of O l3ads to a 2% increase in UV radiation reaching the Earth's surface. ** Some consequences of less ozone: * Increased amounts of UV radiation reach the Earth’s surface which can lead to: * Increased cases of human skin cancer & cataracts, and increased damage to other animals and to plants. * Increased energy reaching the Earth’s surface and thus increased surface temperatures. VERTICAL STRUCTURE OF THE ATMOSPHERE Important aspects of the atmosphere: Air Pressure & Temperature. Air Pressure is the force exerted by the weight of a column of air above a given point. * At sea level the average pressure is 1013 mb or 1 kg above every cm2, or 29.92 inches of mercury. * There is an inverse relationship between air pressure and height, such that air pressure decreases with increasing height. * Regarding volume, 50% of the atmosphere is below 5.6 km (~ 3.36 mi) and 90% of the atmosphere is below 16 km (~ 9.6 mi). Temperature (Tº) is the average molecular motion of an object. It is a measure of the degree of hotness or coldness of a substance. A function of pressure and volume. * Tº may decrease or increase with changing altitude in the atmosphere. * In the Troposphere it normally decreases with an increase in altitude at an average rate of 6.5 degrees C/km, BUT if the temperature increases with altitude it’s called a Temperature Inversion. * Any change in Tº with a change in altitude is termed a Temperature Lapse Rate. Temperature: average molecular motion Heat: total molecular motion Layers of the Atmosphere: Two general regions based on their chemical composition: Homosphere which is the area of uniform chemical composition in the lower atmosphere (surface to 80 - 100 km (50 - 63 mi) altitude). Heterosphere which is the area of non-uniform chemical composition in the upper atmosphere (above the Homosphere). There are also 4 layers delineated by temperature changes: Troposphere is where temperature usually decreases with the increasing altitude from the surface to an average altitude of 8-10 miles. * The troposphere is heated from the ground up. * This is where almost all weather takes place. Stratosphere is where Tº stays constant or increases with altitude. Ozone is in the stratosphere, which warms the temperature up. * It lies above the troposphere to an altitude of about 50km (31 mi) and contains the ozone layer which is the heating element for this layer. Mesosphere shows a Tº decrease with increasing altitude between ~ 50 & 80 km (31 & 50 mi). Thermosphere is the top layer and where Tº increases dramatically with altitude. It is also the area of the atmosphere where the aurora borealis and aurora australis occur (Northern & Southern Lights). RADIATION/ENERGY BALANCE ENERGY is the ability or capacity to do work on some form of matter. Potential energy is the energy of an object prior to it being released as free energy, commonly called the energy at rest. Kinetic energy is the free energy of motion or action. Molecular vibration or rotation. Heat energy is the kinetic energy generated by the motion of molecules. It is measure as the sum total of all molecular motion of an object. Radiant energy is the energy transferred as electromagnetic waves by all objects with a temperature greater than 0 K (-273 degrees C or absolute zero). * Energy follows the Laws of Thermodynamics: First Law of Thermodynamics: In all physical & chemical changes energy is neither created nor destroyed, but it may be converted from one form to another. (Law of Conservation of Energy) Second Law of Thermodynamics: When energy is changed from one form to another, some of the useful energy is always degraded to lower-quality, more dispersed, less useful energy.
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