2020 Temps Tied Record

January 14, 2021


Housebound by a pandemic, humanity slowed its emissions of greenhouse gases in 2020. But Earth paid little heed: Temperatures last year tied the modern record, climate scientists reported today. Overall, the planet was about 1.25°C warmer than in preindustrial times, according to jointly reported assessments from NASA, the U.K. Met Office, and other institutions.

The annual update of global surface temperatures—an average of readings from thousands of weather stations and ocean probes—shows 2020 essentially tied records set in 2016. But the years were nothing alike. Temperatures in 2016 were boosted by a strong El Niño, a weather pattern that warms the globe by blocking the rise of cold deep waters in the eastern Pacific Ocean. Last year, however, the Pacific entered La Niña, which has a cooling effect. That La Niña didn’t provide more relief is an unwelcome surprise, says Nerilie Abram, a climate scientist at Australian National University. “It makes me worried about how quickly the global warming trend is growing.”

The past 6 years are the six warmest on record, but the warming of the atmosphere is unsteady because of its chaotic nature. The ocean, which absorbs more than 90% of the heat from global warming, displays a steadier trend, and here, too, 2020 was a record year. The upper levels of the ocean contained 20 zettajoules (1021joules) more heat than in 2019, and the rise was double the typical annual increase, scientists reported yesterday in Advances in Atmospheric Sciences. The subtropical Atlantic Ocean was particularly hot, fueling a record outbreak of hurricanes, says Lijing Cheng, a climate scientist at the Chinese Academy of Sciences’s Institute of Atmospheric Physics who led the work.

This heat, monitored down to 2000 meters by a fleet of 4000 robotic probes, is spreading deeper into the ocean while also migrating toward the poles. An extreme heat wave struck the northern Pacific, killing marine life. For the first time, warm Atlantic waters were seen penetrating into the Arctic Ocean, melting sea ice from below and driving its extent nearly to a record low. The warming ocean and melting ice sheets are raising sea levels by 4.8 millimeters per year, and the rate is accelerating.

4 Responses to “2020 Temps Tied Record”

  1. If we take the invention of the steam engine as the start of the industrial revolution then we don’t know if last year’s temperature anomalies are records. This invention happened ca. 1700. So the term pre-industrial does not mean much. There are simple not enough temperature or any other records to say something over these times. It is better no longer use thes term pre-industrial time but use say the baseperiod 1850-1900 or something. something that does make more sense.

    • grindupbaker Says:

      Globally-scoped proxies for surface temperature are used prior to 1850 AD and there are ~12 covering the 1700-1900 period but the variation between them is very large ~+/-0.18 degrees, and the increase in CO2 from 1750 to 1870 gives +0.097 degrees increase in surface-air temperature over that time for that one cause, from the physics and including the +ve feedbacks, so if it warmed more than that then the rest was natural and nothing to do with this topic so I agree that 1850-1900 makes much sense as a starting value for modern warming caused by the “greenhouse gases (GHGs)” though your “we don’t know if last year’s temperature anomalies are records” is childish.
      Figure 1 at https://skepticalscience.com/pages2k-confirms-hockey-stick.html (from the PAGES2K project) shows global mean surface-air temperature change of 0.032 degrees from 1750 to 1900, but the huge uncertainty is +/-0.13 degrees. I’ve seen a plot in a scientist video showing 8 proxies with a simple average of 0.16 degrees +/- 0.18 degrees from 1750 to 1900, and I’ve seen yet another plot in a scientist video showing several more than 8 proxies and that one SHOWS COOLING as the simple average of them all from 1750 to 1900 (some have cooling, some have warming).

  2. […] Global Warming Policy Forum, in response to yesterday’s announcement that 2020 tied for hottest year in the record, produced the graph […]

  3. grindupbaker Says:

    “the warming of the atmosphere is unsteady because of its chaotic nature” in this post is almost entirely incorrect on an annually-averaged basis. Wonderfully ironically, the warming of the atmosphere is unsteady mostly because of the somewhat-chaotic nature of major ocean currents (affecting its average surface temperature) rather than the chaotic nature of the atmosphere. Then the ocean, which mostly made air average temperature change chaotic, itself displays a much steadier trend (which is actually the direct measure of the heater that’s heating the ecosphere). The ocean of course has 99.84% of Earth’s ecosphere heat content excluding ice sheets’ 2.5% (the other 0.16% is air+land heat content) so the End Game with all ice gone and millenia of warming is that 99.84% of the heat goes into the ocean. Pretty simple stuff.

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