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
edit
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
editDiurnal 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
editA 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
editReferences
edit- ^ a b c Betts, A (2015). "BOUNDARY LAYER (ATMOSPHERIC) AND AIR POLLUTION | Diurnal Cycle". Diurnal Cycle (2nd ed.). pp. 319–23. doi:10.1016/B978-0-12-382225-3.00135-3. ISBN 9780123822253.319-23&rft.edition=2nd&rft.date=2015&rft_id=info:doi/10.1016/B978-0-12-382225-3.00135-3&rft.isbn=9780123822253&rft.aulast=Betts&rft.aufirst=A&rft_id=https://www.sciencedirect.com/science/article/pii/B9780123822253001353&rfr_id=info:sid/en.wikipedia.org:Diurnal cycle" class="Z3988">
{{cite encyclopedia}}:|journal=ignored (help) - ^ Hartmann, Dennis L. (1994). "The Energy Balance of the Surface". International Geophysics. 56: 81–114. doi:10.1016/S0074-6142(08)60561-6. ISSN 0074-6142.81-114&rft.date=1994&rft_id=info:doi/10.1016/S0074-6142(08)60561-6&rft.issn=0074-6142&rft.aulast=Hartmann&rft.aufirst=Dennis L.&rft_id=https://www.sciencedirect.com/science/article/pii/S0074614208605616&rfr_id=info:sid/en.wikipedia.org:Diurnal cycle" class="Z3988">
- ^ a b 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 28416704.614-623&rft.date=2017&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5462061#id-name=PMC&rft.issn=0032-0889&rft_id=info:pmid/28416704&rft_id=info:doi/10.1104/pp.17.00152&rft.aulast=Matthews&rft.aufirst=Jack S.A.&rft.au=Vialet-Chabrand, Silvere R.M.&rft.au=Lawson, Tracy&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5462061&rfr_id=info:sid/en.wikipedia.org:Diurnal cycle" class="Z3988">
- ^ 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 18979947.337-343&rft.date=2008&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3181887#id-name=PMC&rft.issn=1294-8322&rft_id=info:pmid/18979947&rft_id=info:doi/10.31887/DCNS.2008.10.3/awjustice&rft.aulast=Wirz-Justice&rft.aufirst=Anna&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3181887&rfr_id=info:sid/en.wikipedia.org:Diurnal cycle" class="Z3988">
- ^ 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 0038-0717.15-18&rft.date=1984&rft_id=info:doi/10.1016/0038-0717(84)90118-4&rft.issn=0038-0717&rft.aulast=G.K.&rft.aufirst=Sims&rft.au=Dunigan, E.P.&rft_id=https://www.sciencedirect.com/science/article/abs/pii/0038071784901184&rfr_id=info:sid/en.wikipedia.org:Diurnal cycle" class="Z3988">
 | This article about atmospheric science is a stub. You can help Wikipedia by expanding it. |