Aerosols can also have
big effects on clouds, for instance making them brighter so that they reflect more sunlight back into space.
Not exact matches
The emergence of chemistry had a transformative
effect on the universe because of a peculiar property of atomic hydrogen: If you take a
big cloud of hydrogen atoms and let it collapse, it gets hotter and hotter until all the bound - up energy keeps it from shrinking any further.
«Even with the
effect the
cloud has
on free - to - play, for
big companies like us, who have many thousands of developer's salaries to pay, committing completely to free - to - play still feels like too much of a risk,» admitted Comte.
The paper he wrote together with Friis - Christensen in which he found a correlation between solar activity and
clouds had a «slight» flaw: it ignored that the period of the study coincided with a
big El Nino, and that large scale changes in ocean surface temperature are going to have an
effect on cloud formation.
I have read more than one paper
on the topic, and my assessment is that
cloud cover and other water vapor
effects are widely recognized as among the
biggest unknowns going forward.
(Water vapor and low - level
clouds can have a
big effect on the radiative balance of the surface.)
(Note that radiative forcing is not necessarily proportional to reduction in atmospheric transparency, because relatively opaque layers in the lower warmer troposphere (water vapor, and for the fractional area they occupy, low level
clouds) can reduce atmospheric transparency a lot
on their own while only reducing the net upward LW flux above them by a small amount; colder, higher - level
clouds will have a
bigger effect on the net upward LW flux above them (per fraction of areal coverage), though they will have a smaller
effect on the net upward LW flux below them.
On the uncertainty of CO2 forcing, my experience has been that the
biggest uncertainy is not in the radiation models themselves, but in the
effect of
clouds.
(Note: the
biggest issue is climate sensitivity, with a secondary issue being the magnitude of modes of natural internal variability
on multi-decadal time scales, and tertiary issues associated model inadequacies in dealing with aerosol -
cloud processes and solar indirect
effects.)
In our study, the
biggest aerosol
effect on climate came from the
effect of aerosol -
cloud indirect
effect.
It indicated that contrails — white lines of Vapor left by jet engines — also have
big knock -
on effects by adding to the formation of high - altitude, heat - trapping cirrus
clouds as the lines break up.