Earth:Land surface effects on climate

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Land surface effects on climate are wide-ranging and vary by region. Deforestation and exploitation of natural landscapes play a significant role. Some of these environmental changes are similar to those caused by the effects of global warming.[1][2][3]

Deforestation effects

Major land surface changes affecting climate include deforestation (especially in tropical areas),[4][5][6][7][8] and destruction of grasslands and xeric woodlands by overgrazing, or lack of grazing. These changes in the natural landscape reduce evapotranspiration, and thus water vapor, in the atmosphere, limiting clouds and precipitation. It has been proposed, in the journal Atmospheric Chemistry and Physics, that evaporation rates from forested areas may exceed that of the oceans, creating zones of low pressure, which enhance the development of storms and rainfall through atmospheric moisture recycling.[9] The American Institute of Biological Sciences published a similar paper in support of this concept in 2009.[10] In addition, with deforestation and/or destruction of grasslands, the amount of dew harvested (or condensed) by plants is greatly diminished.[11][12][13] All of this contributes to desertification in these regions.

25-50% of the rainfall in the Amazon basin comes from the forest, and if deforestation reaches 30-40% most of the Amazon basin will enter a permanent dry climate.[14] In another article published by Nature, it points out that tropical deforestation can lead to large reductions in observed precipitation.[15]

This concept of land-atmosphere feedback is common among permaculturists, such as Masanobu Fukuoka, who, in his book, The One Straw Revolution, said "rain comes from the ground, not the sky."[16][17]

Deforestation, and conversion of grasslands to desert, may also lead to cooling of the regional climate. This is because of the albedo effect (sunlight reflected by bare ground) during the day, and rapid radiation of heat into space at night, due to the lack of vegetation and atmospheric moisture.[18]

Reforestation, conservation grazing, holistic land management, and, in drylands, water harvesting and keyline design, are examples of methods that might help prevent or lessen these drying effects.[19]

Mountain meteorological effects

Orographic lift

Main page: Earth:Orographic lift

Orographic lift occurs when an air mass is forced from a low elevation to a higher elevation as it moves over rising terrain. As the air mass gains altitude it quickly cools down adiabatically, which can raise the relative humidity to 100% and create clouds and, under the right conditions, precipitation.[citation needed]

Rain shadow

Main page: Earth:Rain shadow

A rain shadow is a dry area on the leeward side of a mountainous area (away from the wind). The mountains block the passage of rain-producing weather systems and cast a "shadow" of dryness behind them. Wind and moist air is drawn by the prevailing winds towards the top of the mountains, where it condenses and precipitates before it crosses the top. In an effect opposite that of orographic lift, the air, without much moisture left, advances behind the mountains creating a drier side called the "rain shadow".[citation needed]

Foehn wind

Main page: Earth:Foehn wind

A föhn or foehn is a type of dry, warm, down-slope wind that occurs in the lee (downwind side) of a mountain range.[citation needed]

Föhn can be initiated when deep low pressures move into Europe drawing moist Mediterranean air over the Alps.

It is a rain shadow wind that results from the subsequent adiabatic warming of air that has dropped most of its moisture on windward slopes (see orographic lift). As a consequence of the different adiabatic lapse rates of moist and dry air, the air on the leeward slopes becomes warmer than equivalent elevations on the windward slopes. Föhn winds can raise temperatures by as much as 14 °C (25 °F)[20] in just a matter of minutes. Central Europe enjoys a warmer climate due to the Föhn, as moist winds off the Mediterranean Sea blow over the Alps.[citation needed]

See also


References

  1. ↑ "The Effect of Land Masses on Climate". http://www.pbslearningmedia.org/resource/ttv10.sci.ess.land/the-effect-of-land-masses-on-climate/. 
  2. ↑ "How does land-use change affect climate change?". https://www2.usgs.gov/faq/node/5601. 
  3. ↑ Carleton, Thomas Loveland, Rezaul Mahmood, Toral Patel-Weynand, Krista Karstensen, Kari Beckendorf, Norman Bliss, and Andrew. "USGS Open-File Report 2012–1155: National Climate Assessment Technical Report on the Impacts of Climate and Land Use and Land Cover Change". http://pubs.usgs.gov/of/2012/1155/. 
  4. ↑ Zemp, Delphine; Schleussner, Carl-Friedrich; Barbosa, Henrique; Sampaio, Gilvan; Hirota, Marina; Rammig, Anja (12 April 2015). "Cascading effects of deforestation and drying trends on reduced forest resilience in the Amazon region". https://www.researchgate.net/publication/273969744. 
  5. ↑ Zemp, Delphine; Schleussner, Carl-Friedrich; Barbosa, Henrique; Sampaio, Gilvan; Hirota, Marina; Rammig, Anja (2015). "Cascading effects of deforestation and drying trends on reduced forest resilience in the Amazon region". EGU General Assembly Conference Abstracts 17: 15338. Bibcode: 2015EGUGA..1715338Z. 
  6. ↑ Robbins, Jim (9 October 2015). "Opinion - Deforestation and Drought". https://www.nytimes.com/2015/10/11/opinion/sunday/deforestation-and-drought.html?_r=0. 
  7. ↑ "Tropical drying trends in global warming models and observations". UCLA Atmospheric and Oceanic Sciences. http://research.atmos.ucla.edu/csi/RESEARCH/ar4prec.html. 
  8. ↑ Niiler, Eric (April 11, 2016). "Climate Change Is Drying Up Islands". Discovery News. http://news.discovery.com/earth/global-warming/climate-change-is-drying-up-islands-160411.htm. 
  9. ↑ A. M. Makarieva; V. G. Gorshkov; D. Sheil; A. D. Nobre; B.-L. Li (2013). "Where do winds come from? A new theory on how water vapor condensation influences atmospheric pressure and dynamics". Atmos. Chem. Phys. 13 (2): 1039–1056. doi:10.5194/acp-13-1039-2013. Bibcode: 2013ACP....13.1039M. http://www.atmos-chem-phys.net/13/1039/2013/acp-13-1039-2013.pdf. Retrieved 2016-05-14. 
  10. ↑ Sheil, Douglas; Daniel Murdiyarso (2009). "How forests attract rain: an examination of a new hypothesis". BioScience 59 (4): 341+. doi:10.1525/bio.2009.59.4.12. http://lomaprieta.sierraclub.org/forest_protection/FeatureArticles/HowForestsAttractRain.pdf. 
  11. ↑ Staniford, Stuart (December 29, 2011). "A Hypothesis about Global Drying". Early Warning. http://earlywarn.blogspot.ca/2011/12/hypothesis-about-global-drying.html. 
  12. ↑ "Huge parts of world are drying up: Land 'evapotranspiration' taking unexpected turn". ScienceDaily. October 11, 2010. https://www.sciencedaily.com/releases/2010/10/101010133630.htm. 
  13. ↑ Peter Greve; Boris Orlowsky; Brigitte Mueller; Justin Sheffield; Markus Reichstein; Sonia I. Seneviratne (2014). "Global assessment of trends in wetting and drying over land". Nature Geoscience 7 (10): 716–721. doi:10.1038/ngeo2247. Bibcode: 2014NatGe...7..716G. 
  14. ↑ Malhi, Yadvinder; Roberts, J. Timmons; Betts, Richard A.; Killeen, Timothy J.; Li, Wenhong; Nobre, Carlos A. (11 January 2008). "Climate Change, Deforestation, and the Fate of the Amazon". Science 319 (5860): 169–172. doi:10.1126/science.1146961. PMID 18048654. Bibcode: 2008Sci...319..169M. 
  15. ↑ Smith, C.; Baker, J. C. A.; Spracklen, D. V. (March 2023). "Tropical deforestation causes large reductions in observed precipitation". Nature 615 (7951): 270–275. doi:10.1038/s41586-022-05690-1. PMID 36859548. Bibcode: 2023Natur.615..270S. 
  16. ↑ "Rain comes from the ground not the sky, Fukuoka (masanobu fukuoka forum at permies)". http://www.permies.com/t/6471/fukuoka/Rain-ground-sky-Fukuoka. 
  17. ↑ 1978 [1975 Sep.] – The One-Straw Revolution: An Introduction to Natural Farming, translators Chris Pearce, Tsune Kurosawa and Larry Korn, Rodale Press.
  18. ↑ "Deforestation causes cooling, study shows". PhysOrg. November 16, 2011. http://phys.org/news/2011-11-deforestation-cooling.html. 
  19. ↑ Peter Westerveld (December 8, 2010). VIDEO: Reversing climate change is all very simple, says Peter Westerveld (YouTube). TEDxAmsterdam.
  20. ↑ "South Dakota Weather History and Trivia for January". National Weather Service Weather Forecast Office. February 8, 2006. See January 22 entry. http://www.crh.noaa.gov/fsd/?n=fsdtrivia01. 

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