Zerefos, C.S., K. Eleftheratos, D.S. Balis, P. Zanis, G. Tselioudis, and C. Meleti, 2003: Evidence of impact of aviation
on cirrus cloud formation.
In addition, researchers calculated the changes in the shortwave and longwave and net radiation between the pre-industrial simulation and the present - day simulations to estimate the radiative forcing resulting from the aerosol effects
on cirrus clouds.
The direct RF of sulphate and of soot aerosols was likewise quantified along with that of contrails, but the impact
on cirrus clouds that are sometimes generated downwind of contrails was not.
Not exact matches
Besides SSCE, scientists have also been investigating stratospheric sulfur injections — firing sun - reflecting aerosols into the air, similar to the cooling effect after a volcanic eruption — and
cirrus cloud thinning, where you thin the top level of
clouds, which have a warming effect
on the planet.
According to Beat in his nomination letter, «She is an excellent scientist whose research has greatly increased our knowledge of the radiative impact of
cirrus clouds on the tropics.
Four other instruments
on board the aircraft measure the physical properties of droplets and ice crystals in high monsoon and
cirrus clouds.
For example, they will use data from the ARM field campaign SPARTICUS (Small Particles in
Cirrus) between November 2009 and March 2010, which will focus specifically
on measuring properties of
cirrus clouds.
At the recent European Geophysical Union conference, there were posters
on banner
clouds on the Zugspitze, the role of cubic ice crystals in high
cirrus formation, and the role of global cooling in the fall of the Neanderthals.
«While low
clouds have a predominantly cooling effect due to their shading of sunlight, most
cirrus clouds have a net warming effect
on the Earth,» Spencer said.
goodsprk: It relies
on not simply CO2, but
on feedback from increased CO2 raising the temperature which increases the water vapor in the atmosphere which the alarmist assume will actually breaking up the low level
clouds and forming high level
cirrus clouds that will trap more heat.
It relies
on not simply CO2, but
on feedback from increased CO2 raising the temperature which increases the water vapor in the atmosphere which the alarmist assume will actually breaking up the low level
clouds and forming high level
cirrus clouds that will trap more heat.
If the Sun is close to the horizon and feathery
cirrus clouds sit high in the sky, «ghost» images of the Sun will sometimes materialize
on either side of it, giving the appearance of three Suns shining in the sky.
Jackson, R.C., G.M. McFarquhar, A. Fridlind, and R. Atlas, 2015: The dependence of
cirrus gamma size distributions expressed as volumes in N0 - λ - μ phase space and bulk
cloud properties
on environmental conditions: Results from Small Ice Particles in
Cirrus Experiment (SPARTICUS).
NASA's recent
Cirrus Regional Study of Tropical Anvils and
Cirrus Layers - Florida Area
Cirrus Experiment focused
on anvil
cirrus clouds, an important but poorly understood element of our climate system.
The meeting will mainly cover the following themes, but can include other topics related to understanding and modelling the atmosphere: ● Surface drag and momentum transport: orographic drag, convective momentum transport ● Processes relevant for polar prediction: stable boundary layers, mixed - phase
clouds ● Shallow and deep convection: stochasticity, scale - awareness, organization, grey zone issues ●
Clouds and circulation feedbacks: boundary - layer
clouds, CFMIP,
cirrus ● Microphysics and aerosol -
cloud interactions: microphysical observations, parameterization, process studies
on aerosol -
cloud interactions ● Radiation: circulation coupling; interaction between radiation and
clouds ● Land - atmosphere interactions: Role of land processes (snow, soil moisture, soil temperature, and vegetation) in sub-seasonal to seasonal (S2S) prediction ● Physics - dynamics coupling: numerical methods, scale - separation and grey - zone, thermodynamic consistency ● Next generation model development: the challenge of exascale, dynamical core developments, regional refinement, super-parametrization ● High Impact and Extreme Weather: role of convective scale models; ensembles; relevant challenges for model development
Every model assumes that tropical - region
cirrus cloud cover, which has a net warming effect
on surface temperatures, increases with increasing surface temperature — a positive feedback.
What I like about this approach is that it can be matched to observational data
on humidity, ice extent,
cloud extent and type (low, cooling
clouds and high
cirrus clouds that can exert a warming effect).
A simple conceptual model of
cirrus horizontal inhomogeneity and
cloud amount in
cirrus clouds has been formulated
on the basis that internal horizontal inhomogeneity in the ice mixing ratio is due to variations in the
cloud depth, which are assumed to be Gaussian.
Their relatively good spectral resolution makes infrared sounders very useful for the determination of
cloud properties (day and night), and their coarse spatial resolution has less effect
on clouds with large spatial extents like
cirrus clouds.
On top of this, large questions remain over how
cirrus cloud thinning could affect other aspects of the climate system, such as atmospheric circulation, the paper concludes:
The overall heat - trapping effect of
cirrus clouds is so large that it exceeds that of human - released CO2, says Prof Ulrike Lohmann, an atmospheric scientist from ETH Zurich who recently published a review
on cloud thinning in Science.
Depending
on how much moisture is in the air, contrails can be long - lived, spreading out to look more like the wispy
cirrus clouds made by Nature.
A ground - truth dataset based
on two aircraft mission periods flying particle probes through
cirrus over a ground - based
cloud radar is developed.
Chemically, there will be an increase in ozone depletion (due to increases in heterogenous surface chemistry in the stratosphere), increases in acid rain, possibly an increase in high
cirrus cloud cover due to indirect effects of the sulphates
on cloud lifetime.
Hi folks, I guess this should really wait until a posting
on clouds, but I started a new blog called «Head in A
Cloud», focused on current research in cloud physics and in particular cirrus (my research) and upper troposphere / lower stratosphere to
Cloud», focused
on current research in
cloud physics and in particular cirrus (my research) and upper troposphere / lower stratosphere to
cloud physics and in particular
cirrus (my research) and upper troposphere / lower stratosphere topics.
Eleftheratos, K., C.S. Zerefos, P. Zanis, D.S. Balis, G. Tselioudis, K. Gierens, and R. Sausen, 2007: A study
on natural and manmade global interannual fluctuations of
cirrus cloud cover for the period 1984 - 2004.
Chemically, there will be an increase in ozone depletion (due to increases in heterogeneous surface chemistry in the stratosphere), increases in acid rain, possibly an increase in high
cirrus cloud cover due to indirect effects of the sulphates
on cloud lifetime.
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.
I did recently read Lindzen's paper
on the Faint Young Sun paradox, and a possible resolution involving
cirrus clouds.
Richard Lindzen,
on page 19 of his new new paper titled «Can thin
cirrus clouds in the tropics provide a solution to the Faint Young Sun paradox?»