Obviously it's not possible to manipulate the concentration of CO2 in the air in order to carry out real world experiments, but
natural changes in cloud cover provide an opportunity to test the principle.
Not exact matches
A study published
in Nature Climate
Change in March demonstrated that contrails have a net warming effect and can also affect
natural cloud patterns.
Your statement that «Thus it is
natural to look at the real world and see whether there is evidence that it behaves
in the same way (and it appears to, since model hindcasts of past
changes match observations very well)» seems to indicate that you think there will be no
changes in ocean circulation or land use trends, nor any subsequent
changes in cloud responses thereto or other atmospheric circulation.
However, Shelley has always been intrigued with
natural rhythms and slight variations that create shifts
in pattern and perception, such as drum beats
in music, moving and migrating
cloud formations and systematic
changes in color and size of similar shapes that cause an enhanced awareness of an otherwise unnoticeable feature.
Conceived for Turner Contemporary's North Gallery, the exhibition includes a large - scale suspended «
cloud» sculpture, made from simple translucent filters that subtly alter its transparency and opacity as the
natural light
in the space
changes throughout the day, recreating the effect of a passing
cloud.
It is double speak for a climate scientist to assert (correctly I might add) that
natural variability like ENSO will alter the TOA radiative imbalance through
changes in clouds, humidity, evaporation, rainfall, ect., but then out of the other side of the mouth imply that
natural variability doesn't really matter to the multi-decadal projections.
Your statement that «Thus it is
natural to look at the real world and see whether there is evidence that it behaves
in the same way (and it appears to, since model hindcasts of past
changes match observations very well)» seems to indicate that you think there will be no
changes in ocean circulation or land use trends, nor any subsequent
changes in cloud responses thereto or other atmospheric circulation.
I understand the effect can be complicated by
changes in cloud formation and such, but that is just further reasons we should be studying the
natural phenomenon and not generating computer models to spit out arbitrary results with no basis
in observational data.
Based on evidence from Earth's history, we suggest here that the relevant form of climate sensitivity
in the Anthropocene (e.g. from which to base future greenhouse gas (GHG) stabilization targets) is the Earth system sensitivity including fast feedbacks from
changes in water vapour,
natural aerosols,
clouds and sea ice, slower surface albedo feedbacks from
changes in continental ice sheets and vegetation, and climate — GHG feedbacks from
changes in natural (land and ocean) carbon sinks.
For example, let's say that evidence convinced me (
in a way that I wasn't convinced previously) that all recent
changes in land surface temperatures and sea surface temperatures and atmospheric temperatures and deep sea temperatures and sea ice extent and sea ice volume and sea ice density and moisture content
in the air and
cloud coverage and rainfall and measures of extreme weather were all directly tied to internal
natural variability, and that I can now see that as the result of a statistical modeling of the trends as associated with
natural phenomena.
You have not cited a third possibility (out of the infinite range of possibilities), no climate
change associated with CO2 (due to, for example,
cloud cover providing negative feedback), with current increase due to
natural variability; or how about possibility four, that increase
in CO2 concentrations are caused by the temperature rise, which is
in turn caused by (for example) increased solar activity resulting
in increased biomass activity etc. etc..
Unforced
natural cloud variability with significant interannual and decadal
changes in the radiative flux.
I believe it (including water vapor
clouds) is the the 800 pound gorilla
in the room that AGW climate science can't understand because AGW climate science focuses on unvalidated model results and not enough on the actual physics of
natural processes involved
in the complex climate
change process.
The
natural variability affects also the albedo through
changes in clouds.
I was surprised there was no mention of
changes in global albedo or
cloud cover
in the paper, but I assume that AR5 includes them under «
natural variability» rather than forcings.
I say my conclusion was «not unreasonable» because Dr. Scafetta,
in a posting at WattsUpWithThat today, has also concluded that, once the
natural 60 - year cycles of the great ocean oscillations are accounted for (and it may be these cycles that express themselves
in changes in cloud cover such as that which Dr. Pinker had identified), the anthropogenic component
in global warming is considerably less than the IPCC imagines.
Because weather patterns vary, causing temperatures to be higher or lower than average from time to time due to factors like ocean processes,
cloud variability, volcanic activity, and other
natural cycles, scientists take a longer - term view
in order to consider all of the year - to - year
changes.
Instead, Spencer believes most climate
change is caused by chaotic,
natural variations
in cloud cover.
Ionisation of the air
in cloud chambers does demonstrate increase formation of
cloud condensation nuclei but it is not clear that
in the actual atmosphere
in the presence of
natural CCN this effect will manifest itself
in any significant
changes.
Again I want to emphasize that my use of the temperature
change rate, rather than temperature, as the predicted variable is based upon the expectation that these
natural modes of climate variability represent forcing mechanisms — I believe through
changes in cloud cover — which then cause a lagged temperature response.This is what Anthony and I are showing here:
Assuming a CR -
cloud connection exists, there are various factors which could potentially account for a lack of detection of this relationship over both long and short timescales studies, including: uncertainties, artefacts and measurement limitations of the datasets; high noise levels
in the data relative to the (likely low) amplitude of any solar - induced
changes; the inability of studies to effectively isolate solar parameters; or the inability to isolate solar - induced
changes from
natural climate oscillations and periodicities.
The model included a more comprehensive set of
natural and human - made climate forcings than previous studies, including
changes in solar radiation, volcanic particles, human - made greenhouse gases, fine particles such as soot, the effect of the particles on
clouds and land use.
Spencer has postulated elsewhere that
natural factors, such as PDO swings, might be the underlying cause for
changes in cloud cover, which result
in changes in global temperature, IOW that
clouds act as part of a
natural forcing, rather than simply a feedback to anthropogenic (or other) forcing.
If
cloud changes are associated with
natural internal variability which the: models generally consider «unforced variations» then I guess we can pretend that variability averages to zero over a reasonable time frame and ignore it as noise, even though we are not particularly sure what is a reasonable period of time
in climate.
Natural factors such as the Sun (84 papers), multi-decadal oceanic - atmospheric oscillations such as the NAO, AMO / PDO, ENSO (31 papers), decadal - scale
cloud cover variations, and internal variability
in general have exerted a significant influence on weather and climate
changes during both the past and present.
The warming since 1850 has always been due to known external forcing (the sun) modified by known internal forcing (some big volcanoes, a Siberian meteorite and a minor CO2 rise) and to unknown internal forcing (mainly
cloud formation and albedo
changes, perhaps some particulates
in the air) otherwise known as
natural variation.
Regional climatic
changes played a role as well, which was particularly relevant
in Amazon rainforests, which accounted for 42 % of the global NPP increase, owing mainly to decreased
cloud cover and the resulting increase
in solar radiation (note that it is basically impossible to determine how much of this increase
in NPP is a result of recent global climate
change vs.
natural climate variability, although both are likely to have played a role).
According to Jones, a substance produced by thriving coral reefs seed
clouds leading to precipitation
in a long - standing
natural process that is coming under threat due to climate
change.
Topics that I work on or plan to work
in the future include studies of: + missing aerosol species and sources, such as the primary oceanic aerosols and their importance on the remote marine atmosphere, the in - cloud and aerosol water aqueous formation of organic aerosols that can lead to brown carbon formation, the primary terrestrial biological particles, and the organic nitrogen + missing aerosol parameterizations, such as the effect of aerosol mixing on cloud condensation nuclei and aerosol absorption, the semi-volatility of primary organic aerosols, the importance of in - canopy processes on natural terrestrial aerosol and aerosol precursor sources, and the mineral dust iron solubility and bioavailability + the change of aerosol burden and its spatiotemporal distribution, especially with regard to its role and importance on gas - phase chemistry via photolysis rates changes and heterogeneous reactions in the atmosphere, as well as their effect on key gas - phase species like ozone + the physical and optical properties of aerosols, which affect aerosol transport, lifetime, and light scattering and absorption, with the latter being very sensitive to the vertical distribution of absorbing aerosols + aerosol - cloud interactions, which include cloud activation, the aerosol indirect effect and the impact of clouds on aerosol removal + changes on climate and feedbacks related with all these topics In order to understand the climate system as a whole, improve the aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climat
in the future include studies of: + missing aerosol species and sources, such as the primary oceanic aerosols and their importance on the remote marine atmosphere, the
in - cloud and aerosol water aqueous formation of organic aerosols that can lead to brown carbon formation, the primary terrestrial biological particles, and the organic nitrogen + missing aerosol parameterizations, such as the effect of aerosol mixing on cloud condensation nuclei and aerosol absorption, the semi-volatility of primary organic aerosols, the importance of in - canopy processes on natural terrestrial aerosol and aerosol precursor sources, and the mineral dust iron solubility and bioavailability + the change of aerosol burden and its spatiotemporal distribution, especially with regard to its role and importance on gas - phase chemistry via photolysis rates changes and heterogeneous reactions in the atmosphere, as well as their effect on key gas - phase species like ozone + the physical and optical properties of aerosols, which affect aerosol transport, lifetime, and light scattering and absorption, with the latter being very sensitive to the vertical distribution of absorbing aerosols + aerosol - cloud interactions, which include cloud activation, the aerosol indirect effect and the impact of clouds on aerosol removal + changes on climate and feedbacks related with all these topics In order to understand the climate system as a whole, improve the aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climat
in -
cloud and aerosol water aqueous formation of organic aerosols that can lead to brown carbon formation, the primary terrestrial biological particles, and the organic nitrogen + missing aerosol parameterizations, such as the effect of aerosol mixing on
cloud condensation nuclei and aerosol absorption, the semi-volatility of primary organic aerosols, the importance of
in - canopy processes on natural terrestrial aerosol and aerosol precursor sources, and the mineral dust iron solubility and bioavailability + the change of aerosol burden and its spatiotemporal distribution, especially with regard to its role and importance on gas - phase chemistry via photolysis rates changes and heterogeneous reactions in the atmosphere, as well as their effect on key gas - phase species like ozone + the physical and optical properties of aerosols, which affect aerosol transport, lifetime, and light scattering and absorption, with the latter being very sensitive to the vertical distribution of absorbing aerosols + aerosol - cloud interactions, which include cloud activation, the aerosol indirect effect and the impact of clouds on aerosol removal + changes on climate and feedbacks related with all these topics In order to understand the climate system as a whole, improve the aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climat
in - canopy processes on
natural terrestrial aerosol and aerosol precursor sources, and the mineral dust iron solubility and bioavailability + the
change of aerosol burden and its spatiotemporal distribution, especially with regard to its role and importance on gas - phase chemistry via photolysis rates
changes and heterogeneous reactions
in the atmosphere, as well as their effect on key gas - phase species like ozone + the physical and optical properties of aerosols, which affect aerosol transport, lifetime, and light scattering and absorption, with the latter being very sensitive to the vertical distribution of absorbing aerosols + aerosol - cloud interactions, which include cloud activation, the aerosol indirect effect and the impact of clouds on aerosol removal + changes on climate and feedbacks related with all these topics In order to understand the climate system as a whole, improve the aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climat
in the atmosphere, as well as their effect on key gas - phase species like ozone + the physical and optical properties of aerosols, which affect aerosol transport, lifetime, and light scattering and absorption, with the latter being very sensitive to the vertical distribution of absorbing aerosols + aerosol -
cloud interactions, which include
cloud activation, the aerosol indirect effect and the impact of
clouds on aerosol removal +
changes on climate and feedbacks related with all these topics
In order to understand the climate system as a whole, improve the aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climat
In order to understand the climate system as a whole, improve the aerosol representation
in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climat
in the GISS ModelE2 and contribute to future IPCC climate
change assessments and CMIP activities, I am also interested
in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climat
in understanding the importance of
natural and anthropogenic aerosol
changes in the atmosphere on the terrestrial biosphere, the ocean and climat
in the atmosphere on the terrestrial biosphere, the ocean and climate.