HR: 1330h
AN: PP52A-0950    [PDF]
TI: Spatiotemporal patterns of atmospheric circulation changes apparently due to the solar cycle
AU: * Thejll, P A
EM: thejll@dmi.dk
AF: Danish Meteorological Institute, Lyngbyvej, Copenhagen, 2100 Denmark
AU: Gleisner, H
EM: hgl@dmi.dk
AF: Danish Meteorological Institute, Lyngbyvej, Copenhagen, 2100 Denmark
AB: The availability of 3D gridded meteorological reanalysis data now allows us to undertake statistically rigorous, multi-variate investigations of Sun-Climate links on a scale which has hitherto not been practical. However, the tropospheric response to solar variability must be evaluated against a background of intrinsic atmospheric variability and other forcing factors acting concurrently on similar time scales. We have found that consistent patterns of statistically significant solar signals emerge in all major observables throughout the low- and mid-latitude troposphere, when El Ni\~no and volcanic signals are removed from meteorological reanalysis data. The solar signals are strongest in the tropics and at mid-latitudes, and the heating and moistening of the troposphere during solar maximum is accompanied by a modulation of the global-scale tropospheric circulation systems. These findings may have implications for the question of where and how the Sun exerts its influences in the climate system, of use in defining spatiotemporal characteristics from individual and combinations of natural forcing factors.
DE: 0325 Evolution of the atmosphere
DE: 0342 Middle atmosphere--energy deposition
DE: 0350 Pressure, density, and temperature
DE: 1650 Solar variability
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2003 Fall Meeting