{"id":380,"date":"2008-02-05T16:44:10","date_gmt":"2008-02-05T21:44:10","guid":{"rendered":"http:\/\/blogs.edf.org\/climate411\/2008\/02\/05\/2007_temperature_rank\/"},"modified":"2008-02-05T16:44:10","modified_gmt":"2008-02-05T21:44:10","slug":"2007_temperature_rank","status":"publish","type":"post","link":"https:\/\/blogs.edf.org\/climate411\/2008\/02\/05\/2007_temperature_rank\/","title":{"rendered":"2007: One of the Warmest Years on Record"},"content":{"rendered":"<p><img decoding=\"async\" height=\"80\" alt=\"Lisa Moore\" src=\"\/climate411\/wp-content\/files\/2007\/12\/lisa_moore.png\" align=\"left\" class=\"blogAuthorPic\" \/><i>This post is by <a href=\"http:\/\/www.environmentaldefense.org\/page.cfm?tagID=404\">Lisa Moore, Ph.D.<\/a>, a scientist in the Climate and Air program at Environmental Defense.<\/i><\/p>\n<p>The results are in for 2007, and it was a warm one. How warm? It depends who you ask. According to <a href=\"http:\/\/data.giss.nasa.gov\/gistemp\/2007\/\">NASA<\/a>, 2007 was the second warmest year on record. <a href=\"http:\/\/www.noaanews.noaa.gov\/stories2008\/20080115_warmest.html\">NOAA&#8217;s<\/a> analysis put it in fifth place. The University of East Anglia&#8217;s <a href=\"http:\/\/www.cru.uea.ac.uk\/cru\/info\/warming\/\">Climatic Research Unit<\/a> (CRU) ranked it eighth.<\/p>\n<p>The results differ because it&#8217;s not as straightforward as you might think to <a href=\"http:\/\/www.realclimate.org\/index.php\/archives\/2007\/07\/no-man-is-an-urban-heat-island\/langswitch_lang\/in\">take the temperature of the globe<\/a>. There are many subtleties to consider.<\/p>\n<p><!--more--><\/p>\n<p>For one thing, how do you deal with that fact that temperature sensors aren&#8217;t evenly spaced? Which temperature trend are you measuring &#8211; just land, just ocean, or a combination of the two? And how do you handle &quot;urban heat islands&quot; &#8211; the tendency of cities to become warmer than nearby rural areas?<\/p>\n<p>Different research groups take different approaches. For example, NOAA&#8217;s map of temperature has <a href=\"http:\/\/www.cdc.noaa.gov\/cdc\/data.gistemp.html\">grids of 1 degree latitude x 1 degree longitude<\/a>. CRU, in addition to 1 x 1 degree grids, produces <a href=\"http:\/\/www.cru.uea.ac.uk\/cru\/data\/temperature\/#faq\">grids of 5 degrees latitude x 5 degrees longitude<\/a> and <a href=\"http:\/\/www.cru.uea.ac.uk\/cru\/data\/hrg.htm\">0.5 degrees latitude x 0.5 degrees longitude<\/a>. And it&#8217;s not just about the grid. <a href=\"http:\/\/www.realclimate.org\/index.php\/archives\/2007\/08\/1934-and-all-that\/langswitch_lang\/zh\">CRU doesn&#8217;t extrapolate to include the Arctic<\/a>, which is experiencing rapid warming; NASA does.<\/p>\n<p>NASA scientists made two other observations to put 2007 in context. First, last year&#8217;s warmth was &quot;noteworthy because it occurs at a time when solar irradiance is at a minimum.&quot; And second, the Pacific Ocean has shifted into a <a href=\"http:\/\/www.pmel.noaa.gov\/tao\/elnino\/nino-home.html\">La Ni\u00f1a<\/a> phase, when global temperatures are normally cooler than average. So 2007 should have been cooler than average, yet it&#8217;s one of the hottest.<\/p>\n<p>Despite the complexities in measurement, scientists agree on two things. No matter which trend you&#8217;re looking at or how the data are processed, global warming is unequivocal. And this warming is caused by increasing levels of greenhouse gases due to human activities. It&#8217;s past time to cap our emissions!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post is by Lisa Moore, Ph.D., a scientist in the Climate and Air program at Environmental Defense. The results are in for 2007, and it was a warm one. How warm? It depends who you ask. According to NASA, 2007 was the second warmest year on record. NOAA&#8217;s analysis put it in fifth place. &#8230;<\/p>\n","protected":false},"author":45,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[20],"tags":[],"coauthors":[],"class_list":["post-380","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2007: One of the Warmest Years on Record - Climate 411<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.edf.org\/climate411\/2008\/02\/05\/2007_temperature_rank\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2007: One of the Warmest Years on Record - Climate 411\" \/>\n<meta property=\"og:description\" content=\"This post is by Lisa Moore, Ph.D., a scientist in the Climate and Air program at Environmental Defense. 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