Observations show that the standard precipitation index (SPI ) over the southern Amazon region decreased in the period of 1970
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/observed-change-standardized-precipitation-index-its-potential-cause-and
[2] http://admin.indiaenvironmentportal.org.in/category/author/wenhong-li
[3] http://admin.indiaenvironmentportal.org.in/category/author/rong-fu
[4] http://admin.indiaenvironmentportal.org.in/category/author/robinson-i-negron-juarez
[5] http://admin.indiaenvironmentportal.org.in/category/journal/philosophical-transactions-royal-society-b
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/amazon
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-impacts
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/droughts
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall-pattern