{"id":7821,"date":"2018-01-18T10:20:18","date_gmt":"2018-01-18T10:20:18","guid":{"rendered":"http:\/\/sustainableagriculturewaitrose.org\/?p=7821"},"modified":"2018-01-18T10:20:18","modified_gmt":"2018-01-18T10:20:18","slug":"last-year-the-warmest-year-on-record-without-an-el-nino","status":"publish","type":"post","link":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/2018\/01\/18\/last-year-the-warmest-year-on-record-without-an-el-nino\/","title":{"rendered":"Last year the warmest year on record without an El Ni\u00f1o"},"content":{"rendered":"

\"\"Provisional figures for global average near-surface temperatures confirm that last year, 2017, was the warmest year on record without the influence of warming from El Ni\u00f1o.<\/strong><\/p>\n

When viewed alongside 2015 and 2016 \u2013 both of which were dominated by a significant\u00a0El Ni\u00f1o<\/a>\u00a0\u2013 last year was the second- or third-warmest year for annual global temperatures since 1850.<\/p>\n

Scientists at the Met Office Hadley Centre<\/a> and the University of East Anglia<\/a>‘s (UEA) Climatic Research Unit<\/a> produce the HadCRUT4<\/a> dataset, which is used to estimate global temperature.<\/p>\n

The HadCRUT4 global temperature series shows that 2017 was 0.99\u00b10.1 \u00b0C above pre-industrial levels, taken as the average over the period 1850\u20131900, and 0.38\u00b10.1 \u00b0C above the 1981\u20132010 average. 2017 is nominally the third warmest year in the HadCRUT4 series. Figures from other global centres place 2017 as second- or third-warmest.<\/p>\n

Prof Tim Osborn<\/a>\u00a0is the director of research at UEA\u2019s Climatic Research Unit.<\/p>\n

Prof Osborn said: \u201cIt isn’t only the average global temperature that matters: we can also explain the geographical pattern of the warming.\u00a0Greater warming over land and in the Arctic regions, and less warming in the sub-polar oceans, are what we expect from our understanding of climate physics, and this is what we observe.\u201d<\/p>\n

Dr Colin Morice<\/a>\u00a0of the Met Office Hadley Centre said: \u201cThe global temperature figures for 2017 are in agreement with other centres around the world that 2017 is one of the three warmest years and the warmest year since 1850 without the influence of El Ni\u00f1o.<\/p>\n

\u201c2015, 2016 and 2017 were the three warmest years in the series. In addition to the continuing sizeable contribution from the release of greenhouse gases, 2015 and 2016 were boosted by the effect of a strong El Ni\u00f1o, which straddled both years. However, 2017 is notable because the high temperatures continued despite the absence of El Ni\u00f1o and the onset of its cool counterpart, La Ni\u00f1a.\u201d<\/p>\n

The El Ni\u00f1o event spanning 2015-2016 contributed around 0.2\u00b0C to the annual average for 2016, which was about 1.1\u00b0C above the long-term average from 1850 to 1900. However, the main contributor to warming over the last 150 years is human influence on climate from increasing greenhouse gases in the atmosphere. 2017 remains close to 1 \u00b0C above pre-industrial temperatures (1850-1900).<\/p>\n

The Met Office annual average global temperature\u00a0forecast<\/a>\u00a0for 2017 said the global mean temperature for 2017 was expected to be between 0.32 \u00b0C and 0.56 \u00b0C above the long-term (1981\u20132010) average. The provisional figure for 2017, based on an average of three global temperature datasets, of 0.42\u00b10.1 \u00b0C above the long-term (1981\u20132010) average is well within the predicted range. The forecast, made at the end of 2016, also correctly predicted that 2017 would be one of the warmest years in the record.<\/p>\n

The\u00a0HadCRUT4<\/a>\u00a0global temperature dataset is compiled from many thousands of temperature measurements taken across the globe, from all continents and all oceans. The regional variations in temperature are themselves informative in understanding the mechanisms that cause warming in response to the continuing build-up of greenhouse gases in the atmosphere.<\/p>\n

Uncertainties arising from incomplete global coverage, particularly a lack of observations from polar regions, and limitations of the measurements used to produce the data sets, have been included in the calculations. Prof Peter Stott<\/a>, acting director of the Met Office Hadley Centre, said: \u201cRemaining uncertainties are much smaller than the overall warming since pre-industrial times.\u201d<\/p>\n

NASA<\/a>\u00a0and\u00a0NOAA<\/a>\u00a0are also publishing their global mean temperature estimates for 2017 on Jan18, 2018. Differences between the various estimates arise largely from the way that the data-sparse polar regions are handled.<\/p>\n

More detail on the climate of 2017 can be found in global climate monitoring bulletins from the Met Office<\/a>.<\/p>\n

Article source\/image credit: UEA<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Provisional figures for global average near-surface temperatures confirm that last year, 2017, was the warmest year on record without the influence of warming from El Ni\u00f1o. When viewed alongside 2015 and 2016 \u2013 both of which were dominated by a significant\u00a0El Ni\u00f1o\u00a0\u2013 last year was the second- or third-warmest year for annual global temperatures since […]<\/p>\n","protected":false},"author":381,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[242,254,400,510,534,535,736,765,810,868,1131,1145,1170,1190],"class_list":["post-7821","post","type-post","status-publish","format-standard","hentry","category-press-release","tag-climate-change","tag-colin-morice","tag-environment","tag-global-warming","tag-hadcrut4","tag-hadley-centre","tag-met-office","tag-nasa","tag-noaa","tag-peter-stott","tag-temperature","tag-tim-osborn","tag-uea","tag-university-of-east-anglia"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/posts\/7821","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/users\/381"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/comments?post=7821"}],"version-history":[{"count":0,"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/posts\/7821\/revisions"}],"wp:attachment":[{"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/media?parent=7821"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/categories?post=7821"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.lancs.ac.uk\/sustainable-agriculture\/wp-json\/wp\/v2\/tags?post=7821"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}