Elemental Geosystems, 5E (Christopherson) Chapter 1 Foundations of Geography
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AIM: Latitude and Longitude
AIM: Latitude and Longitude Latitude lines run east/west but they measure north or south of the equator (0°) splitting the earth into the Northern Hemisphere and Southern Hemisphere. Latitude North Pole 90 80 Lines of 70 60 latitude are 50 numbered 40 30 from 0° at 20 Lines of [ 10 the equator latitude are 10 to 90° N.L. 20 numbered 30 at the North from 0° at 40 Pole. 50 the equator ] 60 to 90° S.L. 70 80 at the 90 South Pole. South Pole Latitude The North Pole is at 90° N 40° N is the 40° The equator is at 0° line of latitude north of the latitude. It is neither equator. north nor south. It is at the center 40° S is the 40° between line of latitude north and The South Pole is at 90° S south of the south. equator. Longitude Lines of longitude begin at the Prime Meridian. 60° W is the 60° E is the 60° line of 60° line of longitude west longitude of the Prime east of the W E Prime Meridian. Meridian. The Prime Meridian is located at 0°. It is neither east or west 180° N Longitude West Longitude West East Longitude North Pole W E PRIME MERIDIAN S Lines of longitude are numbered east from the Prime Meridian to the 180° line and west from the Prime Meridian to the 180° line. Prime Meridian The Prime Meridian (0°) and the 180° line split the earth into the Western Hemisphere and Eastern Hemisphere. Prime Meridian Western Eastern Hemisphere Hemisphere Places located east of the Prime Meridian have an east longitude (E) address. -
Using Temperature As the Basis, the Atmosphere Is Divided Into Four Layers
Using temperature as the basis, the atmosphere is divided into four layers. The temperature decrease in the troposphere, the bottom layer in which we live, is called the "environmental lapse rate." Its average value is 6.5°C per kilometer, a figure known as the "normal lapse rate." A temperature "inversion," in which temperatures increase with height, is sometimes observed in shallow layers in the troposphere. The thickness of the troposphere is generally greater in the tropics than in polar regions. Essentially all important weather phenomena occur in the troposphere. Beyond the troposphere lies the stratosphere; the boundary between the troposphere and stratosphere is known as the tropopause. In the stratosphere, the temperature at first remains constant to a height of about 20 kilometers (12 miles) before it begins a sharp increase due to the absorption of ultraviolet radiation from the Sun by ozone. The temperatures continue to increase until the stratopause is encountered at a height of about 50 kilometers (30 miles).In the mesosphere, the third layer, temperatures again decrease with height until the mesopause, some 80 kilometers (50 miles) above the surface.The fourth layer, the thermosphere, with no well-defined upper limit, consists of extremely rarefied air. Temperatures here increase with an increase in altitude.Besides layers defined by vertical variations in temperature, the atmosphere is often divided into two layers based on composition. The homosphere (zone of homogeneous composition), from Earth’s surface to an altitude of about 80 kilometers (50 miles), consists of air that is uniform in terms of the proportions of its component gases. -
Date Day Peculiarity Position of the Sun Northern Hemisphere Southern
Date Day Peculiarity Position of the Northern Southern sun hemisphere hemisphere March 21 Equinox Length of day Above the From March and night will Equator 21 to be equal ( 0° ) June 21 Spring Autumn June 21 Summer Northern Above the From June 21 Solstice Hemisphere Tropic of to September experiences its Cancer 23 longest day (231⁄2°N) and shortest night Summer Winter September 23 Equinox Length of day Above the From and night will Equator September 23 be equal ( 0° ) to December 22 Autumn Spring December 22 Winter Solstice Northern Above Tropic From Hemisphere of Capricorn December 22 experiences (231⁄2°S) to March 21 its shortest day and longest night. Winter Summer Utharayanam Dakshinayanam The Sun sets its northward apparent The Sun sets its movement southward apparent movement from Tropic of Capricorn (231⁄2°S) and from Tropic of Cancer (231⁄2°N) and it it culminates on Tropic of Cancer (231⁄2°N) culminates on Tropic of Capricorn (231⁄2°S) Following the winter solstice to June 21. Following the summer solstice to December 22 Causes Earth's revolution It is in an elliptical orbit that the Earth revolves around the Sun Tilt of the axis The axis of the Earth is tilted at an angle of ( the inclination of axis ) 661⁄2° from the orbital plane. If measured from the vertical plane this would be 231⁄2° Parallelism of the Earth's axis. The Earth maintains this tilt throughout its revolution. The apparent movement of the Sun. Since the parallelism is maintained same throughout the revolution, the position of the Sun in relation to the Earth varies apparently between Tropic of Cancer (231⁄2° North) and Tropic of Capricorn (231⁄2° South). -
The International Date Line!
The International Date Line! The International Date Line (IDL) is a generally north-south imaginary line on the surface of the Earth, passing through the middle of the Pacific Ocean, that designates the place where each calendar day begins. It is roughly along 180° longitude, opposite the Prime Meridian, but it is drawn with diversions to pass around some territories and island groups. Crossing the IDL travelling east results in a day or 24 hours being subtracted, so that the traveller repeats the date to the west of the line. Crossing west results in a day being added, that is, the date is the eastern side date plus one calendar day. The line is necessary in order to have a fixed, albeit arbitrary, boundary on the globe where the calendar date advances. Geography For part of its length, the International Date Line follows the meridian of 180° longitude, roughly down the middle of the Pacific Ocean. To avoid crossing nations internally, however, the line deviates to pass around the far east of Russia and various island groups in the Pacific. In the north, the date line swings to the east of Wrangel island and the Chukchi Peninsula and through the Bering Strait passing between the Diomede Islands at a distance of 1.5 km (1 mi) from each island. It then goes southwest, passing west of St. Lawrence Island and St. Matthew Island, until it passes midway between the United States' Aleutian Islands and Russia's Commander Islands before returning southeast to 180°. This keeps Russia which is north and west of the Bering Sea and the United States' Alaska which is east and south of the Bering Sea, on opposite sides of the line in agreement with the date in the rest of those countries. -
Apihelion Vs
Earth’s 4 “spheres” (“spheres” do overlap) 1) solid Earth (6400 km radius) (Know the “Chemical” and “Physical” layers of the solid Earth) 2) hydrosphere (surface of Earth) (Water portion of the Earth’s surface) 97.2% 2.8% Oceans – Saltwater Freshwater liquid ice .65% is liquid Lakes/streams/air Groundwater 3) Atmosphere (100 km above surface) 4) Biosphere (Where life exists) (thin surface of Earth/atmosphere) Weather vs Climate constantly “average weather” changing 6 basic elements of weather/climate temperature of air humidity of air type & amount of cloudiness type & amount of precipitation pressure exerted by air speed & direction of wind Atmosphere Composition / Ozone Layer (pgs. 6-9) Evolution of Earth’s Atmosphere (pgs. 9-11) Exploring the Atmosphere time line for inventions/discoveries 1593 Galileo “thermometer” 1643 Torricelli barometer 1661 Boyle (P)(V)=constant 1752 Franklin kite -> lightning=electricity 1880(90) manned ballons 1900-today unmanned ballons using radiosondes = radio transmitters that send info on temperature/pressure/relative humidity today rockets & airplanes weather radar & satellites Height/Structure of Atmosphere Exosphere (above 800 km) 100 km 100 km (Ionosphere) 90 km Thermosphere 90 km 80 km 80 km 70 km 70 km 60 km Mesosphere 60 km 50 km 50 km 40 km (Ozone Layer) 40 km 30 km Stratosphere 30 km 20 km 20 km 10 km 10 km Troposphere 0 km 0 km extremely 0o hot really hot 0 100 500 1000 cold Temperature Pressure (mb) Homosphere vs Heterosphere 0-80 km above 80 km uniform distribution varies by mass of molecule N2 O He H Ionosphere located in the Thermosphere/Heterosphere N2 O ionize due to absorbing high-energy solar energy lose electrons and become +charged ions electrons are free to move Solar flares let go of lots of solar energy (charged particles) The charged particles mix with Earth’s magnetic field Charged particles are guided toward N-S magnetic poles Charged particles mix with ionosphere and cause Auroras Electromagnetic Spectrum Seasons are due to angle of sun’s rays. -
Prime Meridian ×
This website would like to remind you: Your browser (Apple Safari 4) is out of date. Update your browser for more × security, comfort and the best experience on this site. Encyclopedic Entry prime meridian For the complete encyclopedic entry with media resources, visit: http://education.nationalgeographic.com/encyclopedia/prime-meridian/ The prime meridian is the line of 0 longitude, the starting point for measuring distance both east and west around the Earth. The prime meridian is arbitrary, meaning it could be chosen to be anywhere. Any line of longitude (a meridian) can serve as the 0 longitude line. However, there is an international agreement that the meridian that runs through Greenwich, England, is considered the official prime meridian. Governments did not always agree that the Greenwich meridian was the prime meridian, making navigation over long distances very difficult. Different countries published maps and charts with longitude based on the meridian passing through their capital city. France would publish maps with 0 longitude running through Paris. Cartographers in China would publish maps with 0 longitude running through Beijing. Even different parts of the same country published materials based on local meridians. Finally, at an international convention called by U.S. President Chester Arthur in 1884, representatives from 25 countries agreed to pick a single, standard meridian. They chose the meridian passing through the Royal Observatory in Greenwich, England. The Greenwich Meridian became the international standard for the prime meridian. UTC The prime meridian also sets Coordinated Universal Time (UTC). UTC never changes for daylight savings or anything else. Just as the prime meridian is the standard for longitude, UTC is the standard for time. -
Atmospheric Gases and Air Quality
12.3SECTION Atmospheric Gases and Air Quality Key Terms + Exosphere H H criteria air contaminants 500 He- He Ionosphere O Thermosphere 1 1 1 O 1NO 1OZ 1 2 1 1 Heterosphere NZ 1O 90 Photoionization N2 O2 10-5 70 Mesosphere CO 2 Pressure (mmHg) Pressure -3 of O Photodissociation Figure 12.10 Variations in 10 50 (km)Altitude 78% N2 pressure, temperature, and 21% O CO2 O2 Stratosphere 2 the components that make 1% Ar. etc. Ozone layer up Earth’s atmosphere are 30 Homosphere summarized here. 10-1 Infer How can you explain the changes in temperature Troposphere 10 of O Photodissociation H2O with altitude? 1 150 273 300 2000 major major major components components components Temperature (˚C) Figure 12.10 summarizes information about the structure and composition of Earth’s atmosphere. Much of this information is familiar to you from earlier in this unit or from your study of science or geography in earlier grades. As you know from Boyle’s law, gases are compressible. Th us, pressure in the atmosphere decreases with altitude, and this decrease is more rapid at lower altitudes than at higher altitudes. In fact, the vast majority of the mass of the atmosphere—about 99 percent—lies within 30 km of Earth’s surface. About 90 percent of the mass of the atmosphere lies within 15 km of the surface, and about 75 percent lies within 11 km. Th e atmosphere is divided into fi ve distinct regions, based on temperature changes. You may recognize the names of some or perhaps all of these regions: the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. -
Latitude and Longitude
Latitude and Longitude D.Knauss RRHS 2009 Coordinates • The location of any object can be located by the intersection of two lines. • The Earth is divided into two sets of lines. Latitude Lines and Longitude Lines Longitude Lines • Longitude Lines run from the North to the South pole and are equal in length. They tell you where you are East and West of the Prime Meridian (runs through Greenwich, England). 0o longitude 30o East longitude 30o West longitude Longitude Lines • Looking at the Earth from above the North Pole, you can see the Prime Meridian and the International Date Line. 0o Prime Meridian 90o East 90o West 180o International Date Line International Date Line • The International Date Line sits on the 180º line of longitude in the middle of the Pacific Ocean. It is the imaginary line that separates two consecutive calendar days. - It is not a perfectly straight line and has been moved slightly over the years to accommodate needs of varied countries in the Pacific Ocean. International Date Line • Immediately to the left of the International Date Line (the date) is always one day ahead of the date (or day) immediately to the right of the International Date Line in the Western Hemisphere. So, travelling east across the International Date Line results in a day, or 24 hours being subtracted. Travelling west across the International Date Line results in a day being added. International Date Line and the Prime Meridian Not a Straight Line! Latitude Lines • Latitude lines run from East to West and tell you where you are North and South of the Equator. -
Introduction
Travel geography Time Zones 6.1 Introduction: . Before clocks were invented and time read, people watched the sun to determine day and night. Primitive man planned his activities according to the different position of the sun. Because everyone wants to measure their day with the sun being at its highest point at midday, scientists came up with the idea of dividing the earth into different time zones. The time is the same everywhere within one time zone, but is different to all the other time zones. Travel geography Time Zones 6.1 Introduction: . There are 24 hours in a day, so there are 24 time zones. There are 360 degrees of longitude on the earth. Scientists have divided these by 24, that means that there are 15 degrees of latitude in every time zone. When you move from one time zone to the next one, you change your watch by one hour. If you are travelling in an easterly direction you move your watch one hour forwards, and if you are moving in westerly direction you move it one hour backward. Travel geography Time Zones 6.2 Greenwich Mean Line: . The planet is divided into 360⁰ of imaginary lines which run vertically from pole to pole. These lines are called Meridians, at 0⁰, passes through Greenwich, England. The Greenwich Meridian Line, Longitude 0⁰ is the center of world time. Time zones are determined by how many degrees east or west of the Prime Meridian one is , up to 180⁰ , which is on the opposite side of the planet, and the location of the International Date Line. -
Latitude/Longitude of the Exact Opposite Place LONGITUDE on Earth to Sydney, Australia, 33° 55‘ S, 151° 17‘ E 90° N 180° Sydney LATITUDE 151° 17’ E
GEO 101, January 16, 2014, Latitude and Longitude Finding your way … How geographers locate where things are… Most common locational system Best reference points are ends of rotational axis Latitude and Longitude Measures angular distance in degrees, not distance in miles or km Basic geometry: circle has 360 degrees Babylonians (≈600 BC) chose the number 360. The reason is that their number system was based on 60. To compare, we base our number system on 10. For us, 10 is a nice, round number and we find it very convenient to count in multiples of 10. But the Babylonians liked 60. LATITUDE Midway between N & S pole is Equator = 0° 90° N 0° 90° S 1 Latitude of Mobile ≈ 30° 42’ N. Parallels of latitude measure the angular distance (degrees) north or south of the Equator. Expressed in degrees, minutes, & seconds 60 minutes in 1 degree 60 seconds in 1 minute The lines themselves run east - west like the rungs on a ladder Find distance in miles between Latitude can be used to approximate Mobile and the Galapagos Islands, distances based on following: which is almost due south of Mobile 360° in a circle Galapagos 0° 10’ S Mobile 30° 42’ N ≈ 25,000 miles around earth 25,000 miles / 360° ≈ 69 miles in 1° Difference 30° 52’ or 30 + 52/60 degrees = 30.87° One degree of latitude always ≈ 69 miles This is true because parallels of latitude 30.87° x 69 mi/degree = 2130 miles stay same distance apart LONGITUDE Arbitrary starting place at Greenwich (London), England 180° = International Date Line East West N P 0° = Prime Meridian 2 One degree of longitude ONLY EQUALS 69 Meridians of longitude measure the miles, at the Equator. -
Elemental Geosystems, 5E (Christopherson) Chapter 2 Solar Energy, Seasons, and the Atmosphere
Elemental Geosystems, 5e (Christopherson) Chapter 2 Solar Energy, Seasons, and the Atmosphere 1) Our planet and our lives are powered by A) energy derived from inside Earth. B) radiant energy from the Sun. C) utilities and oil companies. D) shorter wavelengths of gamma rays, X-rays, and ultraviolet. Answer: B 2) Which of the following is true? A) The Sun is the largest star in the Milky Way Galaxy. B) The Milky Way is part of our Solar System. C) The Sun produces energy through fusion processes. D) The Sun is also a planet. Answer: C 3) Which of the following is true about the Milky Way galaxy in which we live? A) It is a spiral-shaped galaxy. B) It is one of millions of galaxies in the universe. C) It contains approximately 400 billion stars. D) All of the above are true. E) Only A and B are true. Answer: D 4) The planetesimal hypothesis pertains to the formation of the A) universe. B) galaxy. C) planets. D) ocean basins. Answer: C 5) The flattened structure of the Milky Way is revealed by A) the constellations of the Zodiac. B) a narrow band of hazy light that stretches across the night sky. C) the alignment of the planets in the solar system. D) the plane of the ecliptic. Answer: B 6) Earth and the Sun formed specifically from A) the galaxy. B) unknown origins. C) a nebula of dust and gases. D) other planets. Answer: C 7) Which of the following is not true of stars? A) They form in great clouds of gas and dust known as nebula. -
Lecture.1.Introduction.Pdf
Lecture 1: Introduction to the Climate System Earth’s Climate System Solar forcing T mass (& radiation) The ultimate driving T & mass relation in vertical mass (& energy, weather..) Atmosphere force to Earth’s climate system is the heating from Energy T vertical stability vertical motion thunderstorm the Sun. Ocean Land The solar energy drives What are included in Earth’s climate system? Solid Earth three major cycles (energy, water, and biogeochemisty) What are the general properties of the Atmosphere? Energy, Water, and in the climate system. How about the ocean, cryosphere, and land surface? Biogeochemistry Cycles ESS200 ESS200 Prof. Jin-Yi Yu Prof. Jin-Yi Yu Thickness of the Atmosphere (from Meteorology Today) The thickness of the atmosphere 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. tmosphere Because of the shallowness of the atmosphere, its motions over large A areas are primarily horizontal. Typically, horizontal wind speeds are a thousands time greater than vertical wind speeds. (But the small vertical displacements of air have an important impact on ESS200 the state of the atmosphere.) ESS200 Prof. Jin-Yi Yu Prof. Jin-Yi Yu 1 Vertical Structure of the Atmosphere Composition of the Atmosphere (inside the DRY homosphere) composition temperature electricity Water vapor (0-0.25%) 80km (from Meteorology Today) ESS200 (from The Blue Planet) ESS200 Prof. Jin-Yi Yu Prof. Jin-Yi Yu Origins of the Atmosphere What Happened to H2O? When the Earth was formed 4.6 billion years ago, Earth’s atmosphere was probably mostly hydrogen (H) and helium (He) plus hydrogen The atmosphere can only hold small fraction of the mass of compounds, such as methane (CH4) and ammonia (NH3).