Talk:Lake Chad

message: * It is important to note that the facts and figures may vary with this lake due to the lake's characteristics and locale. Em3rald 18:22, 17 June 2006 (UTC)
thread_title:  Changes in facts and figures 

message: According to a swedish newspaper the size of the lake is not more than 304km2, instead of the 1540km2 suggested in the article.  ~ Dodde 05:03, 5 November 2006 (UTC)
thread_title: Size of the lake

message: The correct depth is 1.5m, not 4.1 like the info box says, I'm removing an old reference that is way too out of date for a lake that changes this quick.  Going to figure out how to fix the infobox Drunken Pirate 07:10, 18 September 2007 (UTC)
thread_title: Depth of the lake

message: Science writer Michael Chrichton said:
*It turns out Lake Chad has actually been dry multiple times in the past: in 8500 BC, 5500 BC, 2000 BC and 100 BC. Though Wikipedia and a paper in Journal of Geophysical Research on the topic agree that global climate change may have played a role, they also report that the major factors were significant local changes - a rapidly expanding population drawing water from the lake, the introduction of irrigation technologies and local overgrazing. Yes, these are anthropogenic causes, but they are neither global nor warming, and are utterly independent of CO2 . In addition, Africa as a continent experienced a dramatic shift towards dryer weather in the end of the 19th century that is not generally attributed to CO2. (Coe, M.T. and J.A. Foley, Human and natural impacts on the water resources of the Lake Chad basin. Journal of Geophysical Research (Atmospheres) 106, D4, 3349-3356. 2001) 
Is this significant? Should we write about the history of this lake drying up in the past? Are journal articles about the cause relevant? 
I think readers would like to know whether human activity other than CO2 emissions have been a factor in turning this lake into a swamp. --Uncle Ed (talk) 20:10, 28 November 2007 (UTC)
thread_title:  Al Gore's example 

message: Removed from article:
"In 1970, Lake Chad covered 18,130km² (7000mi²) with a reported maximum depth of 4 feet with only 2 feet total variance in depth.
In 1970, Lake Chad covered 18,130km² (7000mi²) with a reported maximum depth of 4 feet with only 2 feet total variance in depth.
In 1973, varying seasonally, Lake Chad covered 12,950km²-26,000km² (5,000mi²-10,000mi²) "Funk & Wagnalls New Encyclopedia" (1973) Funk & Wagnalls, Inc., Library of Congress 72-170933 and had depths ranging from 3 feet in the North-West to less than 20 feet in the south.  Funk & Wagnalls encyclopedia (1973) records that Lake Chad "is steadily decreasing in size because of evaporation and underground seepage."
In 1983, Lake Chad, varying seasonally, covered 10,000km²-25,000km² (3,861mi²-9652mi²)  "Questionnaire filled by Mr. Olusegun C. Irivboje, Water Resources Section, Lake Chad Basin Commission, N'Djamena" (1983) http://www.ilec.or.jp/database/afr/afr-02.html, "Questionnaire filled by Dr. M. Nakashima, International Development Centre of Japan, Tokyo" (1983) http://www.ilec.or.jp/database/afr/afr-02.html had a maximum depth of 36 feet, and a volume of 72km3 (17.27mi3).
In 1988, Lake Chad, varying seasonally, covered 10,000km²-26,000km² (4,000mi²-10,000mi²) "Webster's New World Dictionary, Third College Edition" (1988) Simon & Shuster, Inc., ISBN: 0-13-947169-3.
In 1990, Lake Chad, varying seasonally, covered 8,130km²-51,800km² (7,000mi²-20,000mi²) "The New Lexicon Webster's Encyclopedic Dictionary of the English Language" (1990) Lexicon Publications, ISBN 13: 9780717245765; reported maximum 10 feet depth.
In 1997, Lake Chad, varying seasonally, covered 10,000km²-26,000km² (4,000mi²-10,000mi²) "Webster's New World College Dictionary" (1997) MacMillan USA, ISBN: 0-02-861673-1.
This material presents a bad example of original research by compiling data from different points in time from various sources of uneven crediblity. Dictionaries and encycolpedia do not make good sources of data for this kind of comparision. Surely some published studies discuss the lake's variation over the 20th Century. 75.41.110.200 (talk) 16:32, 13 March 2010 (UTC)
thread_title: Lake size

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*Added archive https://web.archive.org/web/20110526135224/http://dwb.unl.edu/Teacher/NSF/C09/C09Links/www.ccnet.com/~mcumolu/globclim.html to http://dwb.unl.edu/Teacher/NSF/C09/C09Links/www.ccnet.com/~mcumolu/globclim.html
*Added archive https://web.archive.org/web/20120813015647/http://www.waterandnature.org/en/resources/publications/thematic-collection/facts-figures/watersheds-world to http://www.waterandnature.org/en/resources/publications/thematic-collection/facts-figures/watersheds-world
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thread_title:  External links modified 

message: "Lake Chad's receding waters linked to European air pollution – Climate Home – climate change news" . Climate Home – climate change news. 18 June 2013. Retrieved 5 December 2015.
I remain highly skeptical of source #24.  I Googled the broken link and could not verify it was based on any peer-reviewed scientific studies or journals.
It just says at the end: "This article was produced by the Climate News Network"
http://www.climatechangenews.com/2013/06/18/lake-chads-receding-waters-linked-to-european-air-pollution/
Someone with more free time than me should clean up this entire Wikipedia article about Lake Chad and file these speculations under a new subsection about speculations of cause, as opposed to hypothesises and theories about it.  (They are not one and the same.)
If someone can expand the article to include scientific studies and journals, that would be fantastic.
:I concur (source now#32). The given reference links to tabloid science claiming European emissions. This then simply links to the Geophysical Research Letters homepage, not the actual research paper. 
:This is the correct link to 'Yen-Ting Hwang's paper:
https://agupubs.onlinelibrary.wiley.com/doi/10.1002/grl.50502
:This paper says nothing about 'European air pollution'. It merely names emissions from the Northern hemisphere. It also mentions numerous other papers postulating a wide range of other causes for lake Chad shrinking.
:I will amend, removing 'European' and change reference link within 24h.92.12.81.11 (talk) 08:55, 20 July 2021 (UTC)
replies: text: The article section this discussion pertains to appears to have been deleted94.173.223.14 (talk) 16:20, 16 August 2023 (UTC)
thread_title:  Highly Speculative 

message: https://www.newyorker.com/magazine/2017/12/04/lake-chad-the-worlds-most-complex-humanitarian-disaster
--Kintetsubuffalo (talk) 14:03, 27 November 2017 (UTC)
thread_title:  maybe useful 

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*Added archive https://web.archive.org/web/20040629170830/http://www.earthtrends.wri.org/maps_spatial/maps_detail_static.cfm?map_select=294&theme=2 to http://earthtrends.wri.org/maps_spatial/maps_detail_static.cfm?map_select=294&theme=2
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thread_title:  External links modified 

message: Hello fellow Wikipedians,
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*Added archive https://web.archive.org/web/20140911201524/http://www.thisdaylive.com/articles/nigeria-contributes-5m-to-restore-receding-lake-chad/176595/ to http://www.thisdaylive.com/articles/nigeria-contributes-5m-to-restore-receding-lake-chad/176595/
*Added archive https://web.archive.org/web/20100207000528/http://blogs.nationalgeographic.com/blogs/news/chiefeditor/2010/02/lake-chad-ramsar-convention.html to http://blogs.nationalgeographic.com/blogs/news/chiefeditor/2010/02/lake-chad-ramsar-convention.html
*Added archive https://web.archive.org/web/20100206160207/http://www.ilec.or.jp/database/afr/afr-02.html to http://www.ilec.or.jp/database/afr/afr-02.html
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thread_title:  External links modified (January 2018) 

message: I just changed the history section as it implied that the maximum extent of the lake existed in history, whereas the references state that the quoted maximum was derived from data taken by the Shuttle Radar Topographic Mission and occurred in prehistory, before the area was inhabited. Dates for the maximum extent from the source information are quoted as not being accurate or reliable so I did not add them.
I created a separate section titled Pre-History and moved this non historical information into it.
I also changes all dimensions to use the convert template, so that US units are also shown and metric spelling is according to the convert template convention.
Lkingscott (talk) 12:28, 10 January 2024 (UTC)
thread_title: History