Diurnal cycle
Pattern that recurs every 24 hours as a result of one full rotation of the planet Earth
A diurnal cycle (or diel cycle ) is any pattern that recurs every 24 hours as a result of one full rotation of the planet Earth around its axis. [1] Earth's rotation causes surface temperature fluctuations throughout the day and night, as well as weather changes throughout the year. The diurnal cycle depends mainly on incoming solar radiation . [2]
Climate and atmosphere
In climatology , the diurnal cycle is one of the most basic forms of climate patterns , including variations in diurnal temperature and rainfall. [1] Diurnal cycles may be approximately sinusoidal or include components of a truncated sinusoid (due to the Sun's rising and setting) and thermal relaxation ( Newton cooling ) at night. [1] The diurnal cycle also has a great impact on carbon dioxide levels in the atmosphere , due to processes such as photosynthesis and cellular respiration . [3]
Biological effects
Diurnal cycles of light and temperature can result in similar cycles in biological processes, such as photosynthesis in plants [3] and clinical depression in humans. [4] Plant responses to environmental cycles may even induce indirect cycles in rhizosphere microbial activities, including nitrogen fixation . [5]
Semi-diurnal cycle
A semi-diurnal cycle refers to a pattern that occurs about every twelve hours or about twice a day. Often these can be related to lunar tides , in which case the interval is closer to 12 hours and 25 minutes.
See also
References
- 1 2 3 Betts, A (2015). "BOUNDARY LAYER (ATMOSPHERIC) AND AIR POLLUTION | Diurnal Cycle". Diurnal Cycle . Encyclopedia of Atmospheric Sciences (2nd ed.). pp. 319–23. doi : 10.1016/B978-0-12-382225-3.00135-3 . ISBN 9780123822253 .
- ↑ Hartmann, Dennis L. (1994). "The Energy Balance of the Surface" . International Geophysics . 56 : 81–114. doi : 10.1016/S0074-6142(08)60561-6 . ISSN 0074-6142 .
- 1 2 Matthews, Jack S.A.; Vialet-Chabrand, Silvere R.M.; Lawson, Tracy (2017). "Diurnal Variation in Gas Exchange: The Balance between Carbon Fixation and Water Loss" . Plant Physiology . 174 (2): 614–623. doi : 10.1104/pp.17.00152 . ISSN 0032-0889 . PMC 5462061 . PMID 28416704 .
- ↑ Wirz-Justice, Anna (2008). "Diurnal variation of depressive symptoms" . Dialogues in Clinical Neuroscience . 10 (3): 337–343. doi : 10.31887/DCNS.2008.10.3/awjustice . ISSN 1294-8322 . PMC 3181887 . PMID 18979947 .
- ↑ G.K., Sims; Dunigan, E.P. (1984). "Diurnal and seasonal variations in nitrogenase activity (C2H2 reduction) of rice roots" . Soil Biology and Biochemistry . 16 (1): 15–18. doi : 10.1016/0038-0717(84)90118-4 . ISSN 0038-0717 .
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