Not exact matches
Those data, to be collected this year and next, could improve climate models, which account poorly
for these
atmospheric interactions and contain «horrific» uncertainties about the levels and behaviour of
water vapour at stratospheric altitudes, Austin says.
«The far north has indeed been behaving bizarrely in Nov / Dec 2016, setting many new records
for temperature, sea ice extent,
atmospheric water vapour content, and Arctic amplification (the difference in temperature between the Arctic and northern mid-latitudes)»
If the enhanced
atmospheric warming from a CO2 - induced temperature rise of 1 oC results in enhanced
water vapour that gives an additional warming of say x oC, the overall warming (doubled CO2 +
water vapour feedback; leaving out other feedbacks
for now) will be something like 1.1 * (1 + x + x2 + x3...) or 1.1 / (1 - x)-RSB-.
However, calculation of the radiative forcing is again a job
for the line - by - line codes that take into account
atmospheric profiles of temperature,
water vapour and aerosols.
The additional
atmospheric water vapour implies increased moisture availability
for precipitation.
The so - called
water vapour feedback, caused by an increase in
atmospheric water vapour due to a temperature increase, is the most important feedback responsible
for the amplification of the temperature increase.
«Trends in observed
atmospheric water vapour are hampered by inhomogeneities in data records, which occur when measurement programmes are discontinued because of,
for example, the limited lifespans of satellite missions or insufficiently documented or understood changes in instrumentation.
One idea was that increased IR radiated from
water vapour in these air masses could off - set expansion due to release of latent heat, and ad drive horizontal circulation This had to be attacked as it showed a role
for radiative gases in
atmospheric circulation.
So, that's 1.2 degrees C
for the basic physics of added greenhouse effect of a doubling of carbon dioxide in the atmosphere; coupled with a further increase of a similar magnitude from changes in
atmospheric water vapour that come about as a direct consequence.
Any additional
atmospheric water vapour will only remain in the atmosphere
for a few days before precipitating and restoring the previous balance.
Humans have no direct control over
atmospheric concentrations of
water vapour, although it can act as an enhancer
for any global warming.
Based on the understanding of both the physical processes that control key climate feedbacks (see Section 8.6.3), and also the origin of inter-model differences in the simulation of feedbacks (see Section 8.6.2), the following climate characteristics appear to be particularly important: (i)
for the
water vapour and lapse rate feedbacks, the response of upper - tropospheric RH and lapse rate to interannual or decadal changes in climate; (ii)
for cloud feedbacks, the response of boundary - layer clouds and anvil clouds to a change in surface or
atmospheric conditions and the change in cloud radiative properties associated with a change in extratropical synoptic weather systems; (iii)
for snow albedo feedbacks, the relationship between surface air temperature and snow melt over northern land areas during spring and (iv)
for sea ice feedbacks, the simulation of sea ice thickness.
CO2 is irrelevant to
atmospheric warming — after the first 120m of traverse of LWIR through the atmosphere
water vapour absorbs the IR to extinction and there is nothing left
for the CO2 bands to absorb.
The link between heat and Hurricane intensity is unquestionable, as
atmospheric water vapour density increases with higher temperatures, the energy source is likewise augmented, same goes
for cyclones.
As I read
for example Bony et al. 2006, Soden and Held 2006, there are in the IPCC dogma four «feedbacks»: increased
atmospheric optical thickness due to increased
water vapour column amount due to sustained relative humidity; cloud radiative effects; albedo effects; lapse rate effects.
I was assisted by David MacKay who reviewed a short study
for my group on the economics of synthesising liquid fuel using nuclear power,
atmospheric carbon dioxide and
water vapour versus charging electric cars using the same nuclear generated electricity.