Climate models disagree in pattern and magnitude of
projected changes in atmospheric circulation and climate variability, particularly for precipitation (e.g., with respect to the Indian and West African monsoons).
Not exact matches
«The authors write that North Pacific Decadal Variability (NPDV) «is a key component
in predictability studies of both regional and global climate
change,»... they emphasize that given the links between both the PDO and the NPGO with global climate, the accurate characterization and the degree of predictability of these two modes
in coupled climate models is an important «open question
in climate dynamics» that needs to be addressed... report that model - derived «temporal and spatial statistics of the North Pacific Ocean modes exhibit significant discrepancies from observations
in their twentieth - century climate... conclude that «for implications on future climate
change, the coupled climate models show no consensus on
projected future
changes in frequency of either the first or second leading pattern of North Pacific SST anomalies,» and they say that «the lack of a consensus
in changes in either mode also affects confidence
in projected changes in the overlying
atmospheric circulation.»»
Abrupt climate
change due to variations
in the
atmospheric circulation and its attendant patterns of climate variability can arise through two principal mechanisms: (1) through abrupt
changes in the time - dependent behavior of the
circulation; or (2) through slowly evolving
changes in the
circulation that
project onto large horizontal gradients
in surface weather.
Three - dimensional (3D) planetary general
circulation models (GCMs) derived from the models that we use to
project 21st Century
changes in Earth's climate can now be used to address outstanding questions about how Earth became and remained habitable despite wide swings
in solar radiation,
atmospheric chemistry, and other climate forcings; whether these different eras of habitability manifest themselves
in signals that might be detected from a great distance; whether and how planets such as Mars and Venus were habitable
in the past; how common habitable exoplanets might be; and how we might best answer this question with future observations.