Temperature reconstructions for the surface of the Northern Hemisphere are based largely on terrestrial records from extra-tropical or high-elevation sites, despite the fact that global average surface temperature changes closely follow those of the global tropics, which are 75 per cent ocean.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/2000-year-long-temperature-and-hydrology-reconstructions-indo-pacific-warm-pool
[2] http://admin.indiaenvironmentportal.org.in/category/author/delia-w-oppo
[3] http://admin.indiaenvironmentportal.org.in/category/author/yair-rosenthal
[4] http://admin.indiaenvironmentportal.org.in/category/author/braddock-k-linsley
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oceans-and-seas
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/el-nino
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/monsoons
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hydrology
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indonesia
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall