408 KB16 KB200820262013Šmit, Žigaštevilka:1letnik:60str. 15-23ISSN:0473-7466COBISSID:16649561URN:URN:NBN:SI:doc-STGXYUQ3slDruštvo matematikov, fizikov in astronomov SlovenijeObzornik za matematiko in fizikoclimatic changesklimatske spremembeMilankovićev modelMilankovitch modelSončno obsevanje in klimatske spremembe po Milankovićevem modelu|Climatic models are essentially based on the energy, received by Earth from the Sun. The article shows methodic derivation of equations that lead to the daily insolation, i. e. the quantity of energy that hits a given area of spherically-shaped earth surface at given geographical amplitude on a given day. Analytical approximations are proposed for the time variation of the tilt of the geographical axis with respect to elliptic and of the eccentricity of Earth's orbit. The relative quantity of energy is calculated for the period of Würm glace age (up to 160 thousand years in the past). A comparison with other calculations and measured climatic variations shows that the simple model reproduces well the main features of the climatic curveOsnova klimatskih modelov je toplota, ki jo Zemlja prejme od Sonca. Prispevek prikaže nazorno izpeljavo enačb, ki vodijo do dnevnega obseva, to je količine toplote, ki v poljubnem delu leta pade na enoto zemeljske površine v obliki krogle pri izbrani geografski širini. Z analitičnimi približki v najnižjem redu je upoštevano spreminjanje nagiba zemeljske vrtilne osi in spreminjanje ekscentričnosti Zemljinega tira. Z modelom je izračunana relativna količina toplote za obdobje würmske poledenitve (do 160 tisoč let nazaj). Primerjava z drugimi računi in izmerjenimi klimatskimi spremembami kaže, da preprosti račun uspešno reproducira osnovno obliko klimatske krivuljeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaDruštvo matematikov, fizikov in astronomov