Although persistent drought in West Africa is well documented from the instrumental record and has been primarily attributed to changing Atlantic sea surface temperatures, little is known about the length, severity, and origin of drought before the 20th century.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/atlantic-forcing-persistent-drought-west-africa
[2] http://admin.indiaenvironmentportal.org.in/category/author/t-m-shanahan
[3] http://admin.indiaenvironmentportal.org.in/category/author/j-t-overpeck
[4] http://admin.indiaenvironmentportal.org.in/category/author/k-j-anchukaitis-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/science
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sedimentation
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/monsoons
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drought
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hydrology
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ghana
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall
