The influence of volcanic, solar and CO2 forcing on the temperatures in the Dalton Minimum (1790–1830): a model study |
| |
| Authors: | Sebastian Wagner Eduardo Zorita |
| |
| Institution: | (1) Institute for Coastal Research, GKSS Research Center, Max-Planck-Str 1, 21502 Geesthacht, Germany |
| |
| Abstract: | The Dalton Minimum (1790–1830) was a period with reduced solar irradiance and strong volcanic eruptions. Additionally, the
atmospheric CO2 concentrations started to rise from the background level of previous centuries. In this period most empirical climate reconstructions
indicate a minimum in global or hemispheric temperatures. Here, we analyse several simulations starting in 1755 with the coupled
atmosphere-ocean model ECHO-G driven by different forcing combinations to investigate which external forcing could have contributed
most strongly to the reduced temperatures during the Dalton Minimum. Results indicate that on global and hemispheric scales,
the volcanic forcing is largely responsible for the temperature drop in this period, especially during its second half, whereas
changes in solar forcing and the increasing atmospheric CO2 concentrations were of minor importance. At regional scales, especially the extratropical, the impact of volcanic forcing
is much less discernible due to the large regional variability, a finding that agrees with empirical temperature reconstructions. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
