April 9th warmest April on record

Originally posted by bellcurve: ↑

A unit within US meteorological agency NOAA issued in recent days a global climate report for April 2021. key excerpts of the report are reproduced below.

the report helps set in context a long term trend rise in temperature on Earth. And so moderates the impact of the noise and the confusion evident among climate change deniers arising from day to day variations in temperatures..

NOAA:

Monthly Temperature: April 2021

”The April 2021 global surface temperature was 0.79°C (1.42°F) above the 20th century average of 13.7°C (56.7°F). This was the smallest value for April since 2013 and was the ninth warmest April in the 142-year record. April 2021 marked the 45th consecutive April and the 436th consecutive month with temperatures, at least nominally, above the 20th-century average. December 1984 was the last time a monthly temperature was below average.”

”The global land surface temperature departure of +1.25°C (+2.25°F) was the smallest temperature departure for April since 2015 and was the 12th highest on record. Similarly, the global ocean surface temperature departure (+0.62°C / +1.12°F) was the smallest for April since 2014 and the eighth highest on record for April.

“The January–April global surface temperature was 0.77°C (1.39°F) above the 20th century average—the smallest January–April temperature departure since 2014 and the eighth highest in the 142-year record. According to a statistical analysis done by NCEI scientists, the year 2021 is very likely to rank among the ten warmest years on record and has less than 4% chance to rank among the five warmest years on record.”

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in his regular analysis in Yaleclimateconnectionsof global climate reports meteorologist Jeff Masters made further comments about temperatures in April, La Nina and Arctic Sea ice. Australia’s hot spot Marble Bar even got a guernsey.

Masters, Ph.D.Jeff worked as a hurricane scientist with the NOAA Hurricane Hunters from 1986-1990. After a near-fatal flight into category 5 Hurricane Hugo, he left the Hurricane Hunters to pursue a safer passion - earning a 1997 Ph.D. in air pollution meteorology from the University of Michigan.

MASTERS:

“The relative coolness of April was partially the result of a dissipating La Niña event in the Eastern Pacific: Its cool waters helped depress global surface temperatures. April 2021 was Europe’s coolest April since 2003, according to the European Copernicus Climate Change Service.

“Global satellite-measured temperatures in April 2021 for the lowest eight kilometers of the atmosphere were the 20th-warmest in the 43-year record, according to the University of Alabama in Huntsville.

La Niña ends

”The moderate La Niña event that began in the summer of 2020 ended in April 2021, said NOAA in its May 13 monthly discussion of the state of the El Niño/Southern Oscillation, or ENSO. The Australian Bureau of Meteorology, which uses a more stringent threshold than NOAA for defining La Niña, reported that the 2020-2021 La Niña event ended in March.

“Historically, about half of all La Niña events have continued into or re-emerged during a second year.

Arctic “sea ice extent during April 2021 was the sixth-lowest in the 43-year satellite record, remaining below the tenth percentile range throughout April, according to the National Snow and Ice Data Center.

“There was little change in the age distribution of the ice compared to last year; at the end of the ice growth season in mid-March, 73.3% of the Arctic Ocean domain was covered by first-year ice, while 3.5% was covered by ice 4+ years old. In March 1985, near the beginning of the ice age record, there was nearly equal amounts of first-year ice (39%) and 4+ year-old ice (30.6%).

“Highest 2021 average temperature to date (Jan-Apr) worldwide: 31.0°C (87.8°F) at Marble Bar, Australia.”