Effaith tŷ gwydr: Gwahaniaeth rhwng fersiynau
Cynnwys wedi'i ddileu Cynnwys wedi'i ychwanegu
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Mae'r '''effaith tŷ gwydr''' yn cyfeirio at newid yn nhymheredd [[ecwilibriwm thermol]] planed neu leuad gan bresenoldeb [[atmosffer]] sy'n cynnwys nwy sy'n amsugno [[ymbelydredd]] [[is-goch]].<ref>[http://www.ipcc.ch/pdf/assessment-report/ar4/syr/ar4_syr_appendix.pdf] IPCC AR4 SYR Appendix Glossary</ref> Mae [[nwy tŷ gwydr|nwyon tŷ gwydr]] yn cynhesu'r atmosffer drwy amsugno'n effeithlon yr ymbelydredd is-goch sy'n cael ei allyrru gan wyneb y ddaear, gan yr atmosffer ei hunan, a gan [[cwmwl|gymylau]]. Fel canlyniad o'r gwred mae'r atmosffer hefyd yn pelydru is-goch thermol i bob cyfeiriad, gan gynnwys i lawr at wyneb y ddaear. Ac felly, mae'n dal gwres rhwng y system troposffer-arwynebol.<ref name=ipcc-AR4WG1">A concise description of the greenhouse effect is given in the ''Intergovernmental Panel on Climate Change Fourth Assessment Report,'' "What is the Greenhouse Effect?" [http://ipcc-wg1.ucar.edu/wg1/Report/AR4WG1_Print_Ch01.pdf IIPCC Fourth Assessment Report, Chapter 1], page 105: "To balance the absorbed incoming [solar] energy, the Earth must, on average, radiate the same amount of energy back to space. Because the Earth is much colder than the Sun, it radiates at much longer wavelengths, primarily in the infrared part of the spectrum (see Figure 1). Much of this thermal radiation emitted by the land and ocean is absorbed by the atmosphere, including clouds, and reradiated back to Earth. This is called the greenhouse effect."</ref><ref>Stephen H. Schneider, in ''Geosphere-biosphere Interactions and Climate,'' Lennart O. Bengtsson and Claus U. Hammer, eds., Cambridge University Press, 2001, ISBN 0521782384, pp. 90-91.</ref><ref>E. Claussen, V. A. Cochran, and D. P. Davis, ''Climate Change: Science, Strategies, & Solutions,'' University of Michigan, 2001. p. 373.</ref><ref>A. Allaby and M. Allaby, ''A Dictionary of Earth Sciences,'' Oxford University Press, 1999, ISBN 0192800795, p. 244.</ref> Mae'r mecanwaith yn elfennol, yn wahanol i
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