MET OFFICE News
Release issued by COI News Distribution Service on 4 June 2009
Geoengineering
solutions to curb global warming may offer advantages in combating
temperature rise, but could also significantly damage the
earth's eco-systems, climate scientists say in a new study
published recently in the Journal of Geophysical Research.
One such proposal is the deliberate brightening of clouds by
adding sea-salt particles to increase their reflectivity.
Extensive sheets of low-level cloud exist off the coasts of South
Africa, South America and the western USA, and by
'seeding' these clouds to reflect more sunlight away
from the Earth, global warming could be slowed.
Met Office scientists, led by Dr Andy Jones, have investigated
the effects of this particular way of modifying climate using the
Met Office Hadley Centre coupled climate model, and find that
global warming could be slowed by up to 25 years. While there is
clearly significant benefit in delaying increased temperatures,
the results also reveal the downside to such geoengineering. The
most serious is a sharp decrease in rainfall over South America,
which would likely accelerate the die-back of the Amazon
rainforest and the subsequent loss of one of the world's
major carbon stores.
Commenting on the study, Andy Jones said: "While some areas
do benefit from geoengineering of this sort there are other, very
significant regions, where the response could be very detrimental,
raising questions about the practicality of such a scheme."
ENDS
Notes:
* The Met Office Hadley Centre is the UK's foremost centre
for climate change research. Mainly funded by DECC (the Department
of Energy and Climate Change), Defra (the Department for
Environment, Food and Rural Affairs) and the Ministry of Defence,
it provides information and advice to the UK Government on climate
change issues.