Thanks, Andrew. For those in this group the findings in this study are
great news. The more we talk about geoengineering the more seriously people
take global warming, and the less serious the moral hazard. Many of us
have experienced first-hand the prejudice people have for engineering
over
Well done, David. Your article has interesting perspectives on the main
possibilities for model-measurement disagreement.
Just eyeballing the video where (Rahmdorf's?)
volcanic/solar/ENSO-attributed temperature swings
are removed, it seems that ENSO is associated with the plurality of the
Andrew,
The published bounds on Greenland mass loss (by Pfeffer) referred to in
this thread assume
(with good reason, so far) that mass loss is dominated by ice
dynamics/kinematics,
essentially the outflow through select outlet glaciers/gates into the
warmer ocean.
Simultaneously Greenland's
Hi Andrew,
I assume your goal in cloud seeding would be to brighten not darken the
surface to cool climate. In any case, inducing precipitation via cloud
seeding has never worked reliably but if such a method is developed and
demonstrated to work in the Arctic (rather than the semi-arid
Do not give up on BC if you are a die-hard evil genius who wishes to warm
the planet
as quickly as possible.
Another recent study, by some of the same authors, shows
significantly greater BC enhancements,
www.pnas.org/cgi/doi/10.1073/pnas.1206575109
As with most empirical BC studies, sampling
Am I right to be concerned, or am I just ignorant of the literature?
Regarding ocean albedo: I think this is true.
The state-of-the-art ocean (CMIP5) climate models of which I am aware
prescribe ocean albedo based on wavelength, zenith angle, and the
direct/diffuse distinction, and neglect
David,
Any thoughts on the proportion (7.5%) of attendees (presumably cloud
physicists) who do NOT believe that climate change is most likely
real and human caused? The AMS may be skeptical of your survey data
showing so many deniers in its own camp. Just sayin'. Of course if
spouses were present,
Thursday the US State Dept. announced a new climate initiative aimed
at short-lived pollutants like soot, methane, and HFCs. I missed it if
this was mentioned on this group. In any case, this mitigation
strategy is, like most geoengineering proposals, aimed to reduce
warming on faster timescales
This DACS conference will be a watershed event if it succeeds in
significantly narrowing the consensus range of DAC cost from $10--1000
tCO2 to something, well, narrower. Should that occur, I hope the
organizers will publish a conference report in a mainstream academic
journal like Eos so 1. the
Our research has shown that assessments of Greenland reflectivity
change based on MODIS data are problematic.
We have looked for darkening trends with MODIS and statistically
speaking, we find a hint but nothing definitive.
The image shown mentions darkening in 2011 relative to a six-year
On Jan 10, 2:44 pm, Charlie Zender zen...@uci.edu wrote:
http://news.sciencemag.org/sciencenow/2012/01/new-co2-sucker-could-he...
Here's the full article for the benefit of those without net access:
New CO2 Sucker Could Help Clear the Air
by Robert F. Service on 9 January 2012
Air scrubber
http://news.sciencemag.org/sciencenow/2012/01/new-co2-sucker-could-help-clear-.html?ref=hp
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David Archer's new piece on Methanageddon is worthwhile reading
http://www.realclimate.org/index.php/archives/2012/01/much-ado-about-methane/#more-10412
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mike,
those below all have all addressed parts of your query.
in addition, i think there is a newer reference by dorothy koch that i
am missing.
hope this helps,
charlie
@Article{KoH05,
author = {Dorothy Koch and James Hansen},
title ={Distant origins of {Arctic} black carbon:
--
Charlie Zender, Department of Earth System Science
University of California, Irvine (949) 891-2429 :)
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It is helpful to frame the Jacobson results on white roofs in terms of
direct and indirect effects. The unambiguous effect of white roofs is
to increase the direct radiative forcing of any aerosols above. To be
precise, brighter surfaces increase absorption by overlying aerosols
and thus increase
George,
My name is Charlie :)
It's hard to isolate the effects of BC in nature because of all the
other processes that simultaneously affect regional climate. Snow is
disapppearing more quickly in springtime in Asia than North America.
Flanner et al. ACP 2009 show this is consistent with
On 31 juil, 03:55, Andrew Lockley andrew.lock...@gmail.com wrote:
I was very interested in Mike's suggestions about soot deposition and albedo
amplification. There is also a direct albedo change on the charred ground.
I am unable to quantify this effect and wonder if anyone on the list can do
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