Interannual to Decadal Climate Variability of Sea Salt Aerosols in the Coupled Climate Model CESM1.0

TitleInterannual to Decadal Climate Variability of Sea Salt Aerosols in the Coupled Climate Model CESM1.0
Publication TypeJournal Article
Year of Publication2015
JournalJournal of Geophysical Research: Atmospheres
Volume120
Date Published02/2015
Abstract / Summary

This study examines multiyear climate variability associated with sea salt aerosols and their contribution to the variability of shortwave cloud forcing (SWCF) using a 150 year simulation for preindustrial conditions of the Community Earth System Model version 1.0. The results suggest that changes in sea salt and related cloud and radiative properties on interannual timescales are dominated by the El Niño–Southern Oscillation cycle. Sea salt variability on longer (interdecadal) timescales is associated with low-frequency variability in the Pacific Ocean similar to the Interdecadal Pacific Oscillation but does not show a statistically significant spectral peak. A multivariate regression suggests that sea salt aerosol variability may contribute to SWCF variability in the tropical Pacific, explaining up to 20–30% of the variance in that region. Elsewhere, there is only a small sea salt aerosol influence on SWCF through modifying cloud droplet number and liquid water path that contributes to the change of cloud effective radius and cloud optical depth (and hence cloud albedo), producing a multiyear aerosol-cloud-wind interaction.

URLhttp://onlinelibrary.wiley.com/doi/10.1002/2014JD022888/full
DOI10.1002/2014JD022888
Journal: Journal of Geophysical Research: Atmospheres
Year of Publication: 2015
Volume: 120
Date Published: 02/2015

This study examines multiyear climate variability associated with sea salt aerosols and their contribution to the variability of shortwave cloud forcing (SWCF) using a 150 year simulation for preindustrial conditions of the Community Earth System Model version 1.0. The results suggest that changes in sea salt and related cloud and radiative properties on interannual timescales are dominated by the El Niño–Southern Oscillation cycle. Sea salt variability on longer (interdecadal) timescales is associated with low-frequency variability in the Pacific Ocean similar to the Interdecadal Pacific Oscillation but does not show a statistically significant spectral peak. A multivariate regression suggests that sea salt aerosol variability may contribute to SWCF variability in the tropical Pacific, explaining up to 20–30% of the variance in that region. Elsewhere, there is only a small sea salt aerosol influence on SWCF through modifying cloud droplet number and liquid water path that contributes to the change of cloud effective radius and cloud optical depth (and hence cloud albedo), producing a multiyear aerosol-cloud-wind interaction.

DOI: 10.1002/2014JD022888
Citation:
2015.  "Interannual to Decadal Climate Variability of Sea Salt Aerosols in the Coupled Climate Model CESM1.0."  Journal of Geophysical Research: Atmospheres 120.  https://doi.org/10.1002/2014JD022888.