Not exact matches
There are strong competing effects such as
changes in the
large - scale atmospheric circulation,
sea surface temperature changes like El Niño and La Niña and the dynamics of westerly storm tracks that all interact at the mid-latitudes,» said Stanford co-author Matthew Winnick who contributed to the study with fellow doctoral student Daniel Ibarra.
As discussed
in the Climate chapter,
large - scale atmospheric circulation patterns connected to
changes in sea -
surface temperatures strongly influence natural variations
in precipitation and
temperature (e.g., Cayan et al. 1999; Mantua and Hare 2002).
Scientists use a
large drill to remove parts of the coral to analyse for information about
changes in rainfall and
sea surface temperature.
For significant periods of time, the reconstructed
large - scale
changes in the North Pacific SLP field described here and by construction the long - term decline
in Hawaiian winter rainfall are broadly consistent with long - term
changes in tropical Pacific
sea surface temperature (SST) based on ENSO reconstructions documented
in several other studies, particularly over the last two centuries.
During El Nino events the ocean circulation
changes in such a way as to cause a
large and temporary positive
sea surface temperature anomaly
in the tropical Pacific.
The second aspect of climate
change that is likely affecting Alaska more and more is the apparent tendency of warming
in the Arctic and warmer
sea surface temperatures in the Pacific to contribute to
larger waves
in the jet stream.
But it does say; «Natural climate variations, which tend to involve localized
changes in sea surface temperature, may have a
larger effect on hurricane activity than the more uniform patterns of global warming...»
Importantly, the
changes in cereal yield projected for the 2020s and 2080s are driven by GHG - induced climate
change and likely do not fully capture interannual precipitation variability which can result
in large yield reductions during dry periods, as the IPCC (Christensen et al., 2007) states: ``... there is less confidence
in the ability of the AOGCMs (atmosphere - ocean general circulation models) to generate interannual variability
in the SSTs (
sea surface temperatures) of the type known to affect African rainfall, as evidenced by the fact that very few AOGCMs produce droughts comparable
in magnitude to the Sahel droughts of the 1970s and 1980s.»
The
large interannual to decadal hydroclimatic variability
in winter precipitation is highly influenced by
sea surface temperature (SST) anomalies
in the tropical Pacific Ocean and associated
changes in large - scale atmospheric circulation patterns [16].
Scientific confidence of the occurrence of climate
change include, for example, that over at least the last 50 years there have been increases
in the atmospheric concentration of CO2; increased nitrogen and soot (black carbon) deposition;
changes in the
surface heat and moisture fluxes over land; increases
in lower tropospheric and upper ocean
temperatures and ocean heat content; the elevation of
sea level; and a
large decrease
in summer Arctic
sea ice coverage and a modest increase
in Antarctic
sea ice coverage.
Alexander M. A., J. D. Scott, K. D. Friedland, K. E. Mills, J. A. Nye, A. J. Pershing and A. C. Thomas (January 2018): Projected
sea surface temperatures over the 21st century:
Changes in the mean, variability and extremes for
large marine ecosystem regions of Northern Oceans.
Feb 8: Projected
sea surface temperatures over the 21st century:
Changes in the mean, variability and extremes for
Large Marine Ecosystem regions of Northern Oceans