Iceland has
seen average temperatures increase by about 1.2 degrees Celsius since 1975, a rate four times that of the rest of the Northern Hemisphere.
Australia has already
seen its average temperatures increase more than 1.5 degrees Fahrenheit over that of the last century, according to data from CSIRO, Australia's national scientific agency, and the Bureau of Meteorology.
Alaska has
seen an average temperature increase of 4 °F since...
Not exact matches
The global
temperature average has
increased by 1.4 degrees F, which may not seem like a lot, but the effects of the
increase are being
seen and felt globally.
Temperature increases close to or above the
average.61 degrees F rise were
seen in some of the world's most popular waters, including Lake Tahoe (+.97 F by hand, +1.28 by satellite), the Dead Sea (+1.13 F), two reservoirs serving New York City, Seattle's Lake Washington (+.49 F), and the Great Lakes Huron (+1.53 F by hand, +.79 by satellite), Michigan (+.76 F by hand, +.36 by satellite), Ontario (+.59 F) and Superior (+2.09 F by hand measurement, +1.44 F by satellite).
Because the models predict little
average precipitation
increase nationwide over this period, the product of CAPE and precipitation gives about a 12 percent rise in cloud - to - ground lightning strikes per degree in the contiguous U.S., or a roughly 50 percent
increase by 2100 if Earth
sees the expected 4 - degree Celsius
increase (7 degrees Fahrenheit) in
temperature.
With higher levels of carbon dioxide and higher
average temperatures, the oceans» surface waters warm and sea ice disappears, and the marine world will
see increased stratification, intense nutrient trapping in the deep Southern Ocean (also known as the Antarctic Ocean) and nutrition starvation in the other oceans.
All the models I've
seen rely on the assumption that an
increase in atmospheric greenhouse gases will necessarily
increase the long - term
average temperature of the globe and that all the other mechanisms that cause or counteract warming are understood and modeled fairly accurately.
Expressed as a global
average, surface
temperatures have
increased by about 0.74 °C over the past hundred years (between 1906 and 2005;
see Figure 1).
seems to be incompatible with the statement from his Annual review paper from 2000 (
see abstract below) that: «The
average surface
temperature of the continents has
increased by about 1.0 K over the past 5 centuries; half of this
increase has occurred in the twentieth century alone.»
The planet experienced a positive IPO, or El Tio, in the periods 1925 - 1946 and 1977 - 1998, both of which were periods that
saw «rapid»
increases in global
average temperatures, according to the study.
Strong agreement exists among climate models that
average temperatures will continue to
increase through the mid century (2040 - 2069) and end - of - century (2070 - 2099) across Montana (
see Climate chapter).
However, at the
increased levels
seen since the Industrial Revolution (roughly 275 ppm then, 400 ppm now; Figure 2 - 1), greenhouse gases are contributing to the rapid rise of our global
average temperatures by trapping more heat, often referred to as human - caused climate change.
The past century has
seen a 0.8 °C
increase in
average global
temperature, and according to the IPCC, the overwhelming source of this
increase has been emissions of greenhouse gases and other pollutants from human activities.
It's easy to
see that there was a sharp
increase in global
average surface
temperatures from the 1970s through the end of the 1990s.
All the models I've
seen rely on the assumption that an
increase in atmospheric greenhouse gases will necessarily
increase the long - term
average temperature of the globe and that all the other mechanisms that cause or counteract warming are understood and modeled fairly accurately.
«During November 2011 - January 2012, there is an
increased chance of above -
average temperatures across the south - central U.S. with the odds favoring below -
average temperatures over the north - central U.S.. Also, above -
average precipitation is favored across the northern tier of states, excluding New England, and drier - than -
average conditions are more probable across the southern tier of the U.S. (
see 3 - month seasonal outlook released on 20 October 2011).»
The
average temperature increase is real and the effects are happening much more rapidly than anything
seen in the past 2000 years at a minimum and probably since the last ice age around 12000 years ago.
seems to be incompatible with the statement from his Annual review paper from 2000 (
see abstract below) that: «The
average surface
temperature of the continents has
increased by about 1.0 K over the past 5 centuries; half of this
increase has occurred in the twentieth century alone.»
Further, let's agree that this will on
average cause more precipitation due to
increased evaporation at these higher
temperatures (the best data I have
seen say that the precipitation trend over the continental US — where we have the best long term records — is up 5 - 10 % over the last century).
I think that you will find that even a 5deg C
increase in annual
average temperature will still
see average temperature way below zero at the South Pole, and probably the same in Greenland.
In the entirely subjective opinion of a particular group of IPCC authors, it's «extremely likely» (95 % certain) that «more than half of the observed
increase in global
average surface
temperature from 1951 to 2010» was caused by human - generated greenhouse gas emissions (
see the bottom of p. 13 here).
For corn, small long - term
average temperature increases will shorten the duration of reproductive development, leading to yield declines, 4 even when offset by carbon dioxide (CO2) stimulation.5, 6 For soybeans, yields have a two in three chance of
increasing early in this century due to CO2 fertilization, but these
increases are projected to be offset later in the century by higher
temperature stress7 (
see Figure 18.2 for projections of
increases in the frost - free season length and the number of summer days with
temperatures over 95 °F).
Assuming we still don't reform our ways, the 40 years after 2040 could then
see another sharp 2 degree
increase in
temperatures — to 4 degrees Celsius — and another dramatic surge in sea level, culminating in a rise of 2 feet
averaged across the globe, or more if we're unlucky.
«It seems clear that climate change is happening, we continually have record
temperatures for the time of year, there is no return of
temperatures to «below
average» which we would expect if this was just statistical variation, there is
increasing turmoil in the weather, the barrier reef is bleaching to an extent not
seen before and so on.»
There are plenty, but for a conservative example
see IPCC Synthesis Report 2007 Table 5.1 which says to stay within 2 - 2.4 degrees global
average temperature increase above pre-industrial (Copenhagen upper «low risk» target) and 425 - 490ppm CO2 - equivalent concentration at stabilisation, the required change in global CO2 emissions in 2050 (percent of 2000 emissions) is decline between 85 to 50 percent.
«We're
seeing increasing temperatures and relatively little change in
average precipitation, but an
increase in the variability and the occurrence of both wet and dry extremes,» said Daniel Swain, an atmospheric scientist at Stanford's School of Earth, Energy & Environmental Sciences and the lead author of a new paper published in Science Advances.
Finally, the fact that both the oceans and the atmosphere are at their all time highest
temperatures over the past 10 year
average from instrument record and through extrapolation to near - term paleodata, we can
see a remarkable consistent effect of what
increasing greenhouse gases do to overall alterations in Earth's non-tectonic energy storage.
Anyway, it tries to prove something that flies in the face of the evidence that CO2 keeps us warm, and more CO2 heats up the planet (as can be
seen in the nice curves that are not believed by a majority of bloggers in attendance, let alone the obvious
increase in
average temperatures over the last decades).
I'm very convinced that the physical process of global warming is continuing, which appears as a statistically significant
increase of the global surface and tropospheric
temperature anomaly over a time scale of about 20 years and longer and also as trends in other climate variables (e.g., global ocean heat content
increase, Arctic and Antarctic ice decrease, mountain glacier decrease on
average and others), and I don't
see any scientific evidence according to which this trend has been broken, recently.
Parker's null effect was in searching for a trend in UHI: an
increase over time, globally, to
see if that could be used as an alternative explanation for the
increase in global
average temperature.
While I don't doubt the way the amount of IR absorption by CO2
increases due to spectral detuning (I'll accept the quantum mechanics expert's opinions on that), for the life of me I can't
see why that should carry over to the
average surface
Temperature of the whole planet.
It will always come back to the fact that, nominally, it's all about the Sun — e.g., Farmers Almanac is predicting another cold wet winter despite the
increase over the years in the amount of atmospheric CO2: No region will
see prolonged spells of above - normal
temperatures; only near the West and East Coasts will
temperatures average close to normal.
[61]
see the paper of 1906 (facsimile in Gerhard Gerlich, Ralf D. Tscheuschner Falsification Of The Atmospheric CO2 Greenhouse Effects Within The Frame Of Physics International Journal of Modern Physics B 2009 115 pages, 205 references) where it is said that the disappearance of the carbonic acid would cause a 18.7 %
increase of the surface radiation to the cosmos and a decrease of the
average surface
temperature to 288 K (1 - 0,187) 1/4 = 273,5 K.
It is because the air has a vertical
temperature lapse rate and a thickness much above the
average infrared photon path length that the greenhouse effect exists and
increases with the concentration of the greenhouse gases:
see «The atmospheric greenhouse effect is more subtle than you believe» in La Météorologie (n ° 72 February 2011)
Because the models predict little
average precipitation
increase nationwide over this period, the product of CAPE and precipitation gives about a 12 percent rise in cloud - to - ground lightning strikes per degree in the contiguous U.S., or a roughly 50 percent
increase by 2100 if Earth
sees the expected 4 - degree Celsius
increase (7 degrees Fahrenheit) in
temperature.
But when climate scientists looked at a graph of the rise of
temperatures in the last 60 years, they
saw — or thought they
saw — a distinct drop in the rate of
increase in global
average temperatures in the last 15 years.
If we all the oil locked in the tar sands (1.63 trillion barrels), the
average global
temperature would
increase 0.4 degrees Celcius — half of what we've already
seen.
With global
average temperature increasing by approximately 0.75 degrees Celsius in the last century, its most visible and direct effect can be
seen on mountains, says Pradeep Mool, remote sensory expert at the Kathmandu - based International Centre for Integrated Mountain Development (ICIMOD).
This all adds up to an accelerating snowball effect that by the end of the century could
see average global
temperatures increase by six degrees Celsius.
And yet in moderate humidity (60 % or so), you can
see a 10 + degree F drop in
temperature / hour after dark, while the
average temp drop /
increase per day globally is ~ 18F.
However, changes to climate that come with AGW or would tend to come with GW in general are more than a global
average surface
temperature increase, and ACC could be
seen as a more all - encompassing term.
Record droughts in many areas of the world, the loss of arctic sea ice — what you
see is an
increasing trend that is superimposed on annual variablity (no bets on what happens next year, but the five - to - ten year
average in global
temperatures, sea surface
temperatures, ocean heat content — those will
increase — and ice sheet volumes, tropical glacier volumes, sea ice extent will decrease.
As Judith says, one of the key conclusions is the paragraph in large red letters «Most of the observed
increase in global
average temperatures since the mid-20th century is very likely due to the observed
increase in anthropogenic greenhouse gas concentrations... Discernible human influences now extend to other aspects of climate, including ocean warming, continental -
average temperatures,
temperature extremes and wind patterns (
see Figure SPM.4 and Table SPM.2).»
But you also
see typical ups and downs: During the first two decades,
temperatures were fairly flat, and
increases were below the three - decade
average.