Sentences with phrase «global albedo of the earth»

Not exact matches

They tend to believe that as the planet warms, low - level cloud cover will increase, thus increasing planetary albedo (overall reflectiveness of the Earth), offsetting the increased greenhouse effect and preventing a dangerous level of global warming from occurring.

Please note shortwave albedo of Earth has large spatio - temporal variations, but its annual global average is restricted to a narrow range, even if it is not determined by simple material constraints, but by an intricate interplay between many internal degrees of freedom.

Global average temperature is lower during glacial periods for two primary reasons: 1) there was only about 190 ppm CO2 in the atmosphere, and other major greenhouse gases (CH4 and N2O) were also lower 2) the earth surface was more reflective, due to the presence of lots of ice and snow on land, and lots more sea ice than today (that is, the albedo was higher).

For instance the earth's global ocean already has an albedo close to zero so greenhouse gases are limited there and because GHGs modus operandi is restricting radiative cooling and the ocean is still free to cool evaporatively there is no first order significant effect of greenhouse gases over a liquid ocean.

i) Global albedo is closely linked to the latitudinal position of the Earth's clouds and they are mostly found near and along the jets and the ITCZ.

As a result the Earth's global albedo decreased by the equivalent of around — 5 W / m ^ 2, i.e. decrease of reflected SW radiation (= heating of our planet).

Ken: The 33 C figure is derived from looking at the global energy balance, i.e., comparing the actual average surface temperature to the average surface temperature that one would of necessity have to have if the Earth were otherwise the same (in particular, same albedo) but there was no greenhouse effect.

A slight change of ocean temperature (after a delay caused by the high specific heat of water, the annual mixing of thermocline waters with deeper waters in storms) ensures that rising CO2 reduces infrared absorbing H2O vapour while slightly increasing cloud cover (thus Earth's albedo), as evidenced by the fact that the NOAA data from 1948 - 2008 shows a fall in global humidity (not the positive feedback rise presumed by NASA's models!)

Project Earthshine (Earthshine is the ghostly glow of the dark side of the Moon) has been measuring changes of the terrestrial albedo in relation to cloud coverage data; according to cloud coverage data available since 1983, the albedo of the Earth has decreased from 1984 to 1998, then increased up to 2004 in sync with the Mean Global Temperature.

Hence, one gets a positive feedback whereby the warming of the arctic leads to ice melting which lowers the albedo of the earth and thereby leads to further warming of the arctic (and global climate system as a whole).

David Springer wrote: The greenhouse effect, by trapping infrared radiation, can lower the albedo of the earth and cause global warming.

In the past few years several attempts have been made to assess changes in the Earth's planetary albedo, and claims of global dimming and more recently brightening have been debated in journal articles and blogs alike.

They base this claim on Earthshine data (a measurement of the glow of the dark side of the moon that they use to deduce the earth's reflectance) and on an albedo proxy derived from ISCCP parameters after they are regressed with two years of overlapping, but not global, earthshine observations.

The climate history of Earth during the glacial - interglacial cycles of the last 1 million years provides an essential context for an understanding of current climate changes, including the relations between solar irradiance, greenhouse gas (GHG) forcing, albedo changes and global temperatures.

The Canadian boreal forests, which occupy about 30 % of the boreal forests worldwide and 77 % of Canada's total forested land, play a critical role in the albedo of Earth's surface5 and in its global carbon budget6.

In the almost sure knowledge that the earth never experienced a runaway greenhouse even with ancient CO2 levels 10 to 20 times greater than today, these anti-science scoundrels insist with a «high level of confidence» that this amplification is real and it's based on nothing more than faster than expected surface temperature rise in the past few decades which can be TOTALLY explained by multi-decadal cyclic behavior in ocean currents, trade winds, and / or solar magnetic activity causing small global average albedo changes.

You then asked «Or perhaps you can point me to the dataset that shows, for several individual locations for the same period as the temperature set the: * CO2 concentrations (OK, we could use Mauna Loa for that) * Aerosols (sorry, can't use global records for that, there can be huge differences on a local scale) * Absolute humidity * TSI with correction for local albedo, including cloud albedo, and the place on earth» Well actually, I can and have for the USA in terms of CO2, humidity (RH but AH also if you insist), and albedo, not to mention actual solar surface radiation, and various other variables (eg windspeed), as I have previously reported here for quite a few locations, eg Pt Barrow.