by K. Richard, May 22, 2022 in NoTricksZone
A new study indicates nearly all the Northern Hemisphere and Tropical warming in the last 40 years occurred by the late 1990s.
CO2 has risen by about 50 ppm since 1998 (367 to 418 ppm).
Interestingly, upper-air measurements of temperature from balloon-borne sensor radiosonde data, shown below in the image from a new study (Madonna et al., 2022), suggest there was more warming from the early 1980s to late 1990s – when CO2 only rose about 25 ppm (341 to 367 ppm) – than there has been this century.
Radiosonde measurements appear to depict mostly flat temperatures trends since 1998 in both the Northern Hemisphere (25°N to 70°N) and tropics (25°S to 25°N).
Image Source: Madonna et al., 2022
by C. Mass, May 16, 2022 in WUWT
It is now clear that La Nina is not going away, and may hang around into next winter.
Cold water is entrenched over the central and eastern tropical Pacific (the definition of La Nina) and the latest forecast model runs suggest a continuation into fall.
Several of you have asked: what does this imply for our summer weather?
Let me tell you.
But first, the bottom line: the summer effects of La Nina are modest, but will push the western side of our region towards cooler than normal conditions.
During La Nina years, sea surface temperatures off the West coast are usually cooler than normal, and those cooling effects spread inland.
To illustrate, here is the sea surface temperate difference from normal for the summer months (May through September) for La Nina years. Blue colors are cooler than normal.