Comparing today’s temps to the temperature I blogged about in 2009 – a quarter century ago.
Ocean heat content has increased from 1971 to 2018 by 0.396 [0.329 to 0.463, likely range] yottajoules and will likely increase until 2100 by two to four times that amount under SSP1-2.6 and four to eight times that amount under SSP5-8.5. The long time scale also implies that the amount of deep-ocean warming will only become scenario-dependent after about 2040 (medium confidence), and that the warming is irreversible over centuries to millennia (very high confidence).
IPCC
A yottajoule is 1024 joules. A joule is “the heat required to raise the temperature of water from 0 degrees Celsius to 1 degree, or from 32 degrees Fahrenheit to 33.8.”
From the Environmental News Service
ASHEVILLE, North Carolina, July 21, 2009 (ENS) – The world’s ocean surface temperature in June rose to its warmest since 1880, breaking the previous high mark set in 2005, according to a preliminary analysis by NOAA’s National Climatic Data Center in Asheville.
The combined average global land and ocean surface temperature for June was second-warmest since global recordkeeping began.
The combined global land and ocean surface temperature for June 2009 was the second warmest on record, behind 2005, 1.12 degrees Fahrenheit (0.62 degree C) above the 20th century average of 59.9 degrees F (15.5 degrees C).
Susan Feathers 