Tuesday, January 26, 2021

2020 on track to be one of three warmest years on record

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New Delhi, Dec 2 (IANS) Climate change continued its relentless march in 2020, which is on track to be one of the three warmest years on record.

2011-2020 will be the warmest decade on record, with the warmest six years all being since 2015, according to the World Meteorological Organisation.

The global mean temperature for January to October 2020 was around 1.2 degrees Celsius above the 1850-1900 baseline, used as an approximation of pre-industrial levels. 2020 is very likely to be one of the three warmest years on record globally, since modern temperature records began in 1850.

The WMO assessment is based on five global temperature datasets. All those datasets currently place 2020 as the 2nd warmest for the year to date, following 2016 and ahead of 2019. The difference between the warmest three years is small, however, and exact rankings for each data set could change once data for the entire year are available.

The most notable warmth was observed across northern Asia, particularly the Siberian Arctic, where temperatures were more than 5 degrees Celsius above average. Siberian heat culminated in late June, when it reached 38 degrees Celsius at Verkhoyansk on the 20th, provisionally the highest known temperature anywhere north of the Arctic Circle.

Ocean heat is at record levels and more than 80 per cent of the global ocean experienced a marine heatwave at some time in 2020, with widespread repercussions for marine ecosystems already suffering from more acidic waters due to carbon dioxide absorption, according to the provisional WMO report on the State of the Global Climate in 2020.

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The report, which is based on contributions of dozens of international organisations and experts, shows how high-impact events including extreme heat, wildfires and floods, as well as the record-breaking Atlantic hurricane season, affected millions of people, compounding threats to human health and security and economic stability posed by the Covid-19 pandemic.

Despite the Covid-19 lockdown, atmospheric concentrations of greenhouse gases continued to rise, committing the planet to further warming for many generations to come because of the long lifetime of CO2 in the atmosphere, according to the report.

“The average global temperature in 2020 is set to be about 1.2 degrees Celsius above the pre-industrial (1850-1900) level. There is at least a one in five chance of it temporarily exceeding 1.5 degrees Celsius by 2024,” said WMO Secretary General Prof. Petteri Taalas.

“Record warm years have usually coincided with a strong El Nino event, as was the case in 2016. We are now experiencing a La Nina, which has a cooling effect on global temperatures, but has not been sufficient to put a brake on this year’s heat. Despite the current La Nina conditions, this year has already shown near record heat comparable to the previous record of 2016.”

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The WMO Secretary-General said that 2020 has, unfortunately, been yet another extraordinary year for our climate. The world saw new extreme temperatures on land, sea and especially in the Arctic. Wildfires consumed vast areas in Australia, Siberia, the US West Coast and South America, sending plumes of smoke circumnavigating the globe.

“We saw a record number of hurricanes in the Atlantic, including unprecedented back-to-back category 4 hurricanes in Central America in November. Flooding in parts of Africa and South East Asia led to massive population displacement and undermined food security for millions,” Taalas said.

The 2020 provisional State of the Global Climate report is based on temperature data from January to October. The final 2020 report will be published in March 2021.

It incorporates information from National Meteorological and Hydrological Services, regional and global climate centres and United Nations partners including the Food and Agriculture Organisation, the International Monetary Fund (IMF), the Intergovernmental Oceanographic Commission of UNESCO, the International Organisation for Migration (IOM), the United Nations Environment Programme (UNEP), the UN High Commissioner for Refugees (UNHCR), and the World Food Programme (WFP).


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