The following paper is now online available (JGR atmosphere):
http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50868/abstract
Enjoy! Simone
Tilmes, S., et al. (2013), The hydrological impact of geoengineering in
the Geoengineering Model Intercomparison Project (GeoMIP), J. Geophys.
Res. Atmos., 118, 11,036–11,058, doi:10.1002/jgrd.50868.
Abstract:
The hydrological impact of enhancing Earth’s albedo by solar radiation
management is investigated using simulations from 12 Earth System models
contributing to the Geoengineering Model Intercomparison Project
(GeoMIP). We contrast an idealized experiment, G1, where the global mean
radiative forcing is kept at preindustrial conditions by reducing
insolation while the CO2 concentration is quadrupled to a 4xCO2
experiment. The reduction of evapotranspiration over land with
instantaneously increasing CO2 concentrations in both experiments
largely contributes to an initial reduction in evaporation. A warming
surface associated with the transient adjustment in 4xCO2 generates an
increase of global precipitation by around 6.9% with large zonal and
regional changes in both directions, including a precipitation increase
of 10% over Asia and a reduction of 7% for the North American summer
monsoon. Reduced global evaporation persists in G1 with temperatures
close to preindustrial conditions. Global precipitation is reduced by
around 4.5%, and significant reductions occur over monsoonal land
regions: East Asia (6%), South Africa (5%), North America (7%), and
South America (6%). The general precipitation performance in models is
discussed in comparison to observations. In contrast to the 4xCO2
experiment, where the frequency of months with heavy precipitation
intensity is increased by over 50% in comparison to the control, a
reduction of up to 20% is simulated in G1. These changes in
precipitation in both total amount and frequency of extremes point to a
considerable weakening of the hydrological cycle in a geoengineered world.
--
You received this message because you are subscribed to the Google Groups
"geoengineering" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/geoengineering.
For more options, visit https://groups.google.com/groups/opt_out.
