GEOG 1F90 Lecture Notes - Lecture 3: Inverse-Square Law, Tropopause, Universal Transverse Mercator Coordinate System
Document Summary
Grid: small zone = minimize distortion, easting = distance from central meridian, northing = distance north of the equator. Isoline map: line connecting equal value of a given phenomena ex. Legend- key to the symbols: communicate spatial data, record and store info, analyze distributions and spatial patterns, millions of maps produced annually, know how to critically read and understand the language. Earth"s primordial atmosphere: 1st atoms = +4 bya (he + h, outgassing = (h2o, co2, n2, so2, acid rain = rapid weathering, photo-dissociation, h2o + uv radiation = increased oxygen, water accumulates. Increase o2 = photosynthesis: oxygen continues to increase to current levels, o3 develops to uv shield, present atmosphere comp. Vertical structure of atmosphere: gaseous composition, homosphere (0-80km) blend of gases, heterosphere (80km) not uniform gases from, distinct layers, function ionosphere. Ionosphere (60km) >1% mass: absorbs sun rays cosmic/gamma, nb* communications, sun = ionizes atmosphere. Absorbs low frequency am radio: night = no ionization.
