By contrast, although a sudden change in the Gaa tendency is observed overland, the breakpoint is approximately 5 years later than that of
the oceanic Gaa.
The oceanic Gaa [atmospheric greenhouse effect] exhibits a notable increasing trend with a rate of 0.21 W m − 2 yr − 1 in 1979 — 1991, whereas its rate of change (− 0.04 W m − 2 yr − 1) during 1992 — 2014 is not statistically significant.