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  1. Published on: 04/12/2019 10:27 AMReported by: roving-eye
    When viewed alongside 2016 – the warmest year on record and dominated by a significant El Niño – this year is likely to be the second or third warmest year for annual global temperatures since 1850.

    Scientists at the Met Office Hadley Centre and at the University of East Anglia's Climatic Research Unit produce the HadCRUT4 dataset, which is used to estimate global temperature.

    The HadCRUT4 global temperature series shows that the average of January to October 2019 was 1.04±0.1 °C above pre-industrial levels, taken as the average over the period 1850-1900, and 0.43±0.1 °C above the 1981-2010 average. 2019 is nominally the third warmest year in the HadCRUT4 series. Figures from other global centres place 2019 as second warmest.

    Colin Morice of the Met Office Hadley Centre said: “Our global temperature figures are in agreement with other centres around the world that 2019 is set to join each of the years from 2015 as the five warmest years on record.

    “Each decade from the 1980s has been warmer than the previous decade. 2019 will conclude the warmest decade in records that stretch back to the mid-19th century.”

    The main contributor to warming over the last 170 years is human influence on climate from increasing greenhouse gases in the atmosphere. 2019 remains around 1 °C above pre-industrial temperatures (1850-1900).



    The Met Office annual average global temperature forecast for 2019 said the global mean temperature for 2019 was expected to be between 0.98 °C and 1.22 °C above the pre-industrial average period from 1850–1900. The provisional figure for 2019, based on an average of three global temperature datasets, of 1.11±0.1 °C above the long-term (1850–1900) average is well within the predicted range.

    The HadCRUT4 global temperature dataset is compiled from many thousands of air and sea-surface 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.


    Prof Tim Osborn is the Director of Research at the University of East Anglia’s Climatic Research Unit. He said: “The five warmest years for average global surface temperature since records began in 1850 have all occurred in the last five years; by contrast the five coldest years all occurred before 1912. This is climate change and not a coincidence.”




     

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