NOAA's latest report on the state of the global climate confirms that 2020 was among the three hottest years on recordHe is about to end up run over, his mother saves him
American Meteorological Society's latest report on the state of global climate confirms 2020 was among the three warmest years on record
Not just a pandemic, 2020 was also the annus horribilis for the climate, ranking as the hottest year ever recorded in Europe. In fact, 2020 in the old continent was 1,9 ° C above the 1981-2010 average. But the problem affects every corner of the globe, even if not all regions are experiencing change at the same pace.
This is what emerges from the 31st “State of the Climate 2020” report, a special supplement of the Bulletin of the American Meteorological Society (BAMS) of the National Centers for Environmental Information, NOAA, produced by 530 scientists from over 60 nations.
There are many countries that recorded the highest annual average temperatures, including: Belgium (+ 1,9 ° C), the Netherlands (+ 1,6 ° C), Luxembourg (+ 2,1 ° C), France (+ 1,5 ° C), Spain (+ 1,2 ° C), Switzerland (+ 1,5 ° C), Norway (+ 1,9 ° C), Poland (+ 1,9 ° C), Estonia (+ 2,4 ° C), Lithuania (+ 2,3 ° C), Finland (+ 2,4 ° C), Sweden (+2,0 ° C), Belarus (+2,3 ° C), Ukraine (+ 2,8 ° C), European Russia (+2,9 ° C) and Kazakhstan (+ 2,2 ° C).
Globally, the report determined that 2020, along with 2016 and 2019, was one of the three hottest years since 1850. Last year's average global temperature was about 0,6 ° C above the 30-year average of 1981-2010; this despite the transition in the tropical Pacific to the state of La Niña in August.
At the same time, the latest IPCC report published on August 9, 2021 states that in the period 2011-2020 the global surface temperature was 1,09 ° C (0,95 - 1,2) higher than the pre-industrial period 1850-1900.
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Furthermore, even if global rainfall was not exceptionally high in 2020, surface humidity showed high values of water vapor in the oceans, close to a record on land, while the total atmospheric water vapor which is well above the average. This extra moisture exacerbates the effects of higher temperatures on the human body.
According to the study, greenhouse gases were the highest ever recorded. The global mean atmospheric CO2 concentration was 412,5 parts per million (ppm), while the 2020 increase in atmospheric methane concentration (14,8 parts per billion) was the highest such increase since when systematic measurements began in the 80s. And not only that: the year-over-year increase in methane (14,8 parts per billion) was the highest of its kind since the start of systematic measurements.
In addition, the scientists rattle off an alarming scenario point by point:
- the global surface temperature has reached an almost record high. Annual global surface temperatures were 0,54 ° -0,62 ° C above the 1981-2010 average, depending on the dataset used. This places 2020 among the three warmest years since registrations began in the mid to late 1800s
- le sea surface temperatures they have reached a near record level. The global mean sea surface temperature of 2020 was the third highest ever recorded, surpassed only in 2016 and 2019, both associated with El Niño events.
- the global sea level was the highest ever recorded. For the ninth consecutive year, the global mean sea level rose to a new record high and was about 91,3 mm above the 1993 average, which marks the start of the satellite altimeter record. Global sea level is rising at an average rate of 3cm per decade due to climate change. The melting of glaciers and ice caps and the warming of the oceans obviously explain the rise in the global mean sea level.
- 2019/2020 was the 33rd consecutive year in which mountain glaciers lost mass and also the 12th consecutive year in which they lost more than 500 mm in depth. Compared to the 1981-2010 average, lakes in the Northern Hemisphere experienced a decrease in the ice cover period of approximately 8,5 days. This is the third lowest figure since the winter of 1979/80.
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