Not exact matches
This
means convection could easily occur, even at the extremely low
temperatures of Pluto, which
average more
than 300 degrees Fahrenheit below zero.
Several cities reached historic highs for heat, and January's
average mean temperature (29.68 °C) surpassed records set more
than 80 years ago, in January 1932.
As New Scientist has previously reported, this
means we are passing an ominous milestone, with global surface
temperatures now more
than 1 °C above the pre-industrial
average.
Based on my understanding, it would be correct to say that the effect of doubling CO2 while there is no sunlight is for the
temperature drop during the night to be slower —
meaning, the minimum and
average temperature will be higher
than it would have been otherwise.
Following its warmest year on record in 2013 and third warmest in 2014, 2015 remained warm in Australia, with the country experiencing its fifth highest nationally -
averaged annual
temperature in the 106 - year period of record, with a
mean temperature 0.83 °C (1.49 °F) higher
than the 1961 — 1990
average, according to the Bureau of Meteorology.
Because climate systems are complex, increases in global
average temperatures do not
mean increased
temperatures everywhere on Earth, nor that
temperatures in a given year will be warmer
than the year before (which represents weather, not climate).
Global
mean temperature for the period January to September 2017 was 0.47 ° ± 0.08 °C warmer
than the 1981 - 2010
average (estimated at 14.31 °C).
A «positive
temperature anomaly»
means temperatures are higher
than the long - term
average, while a «negative
temperature anomaly»
means they are lower.
Ray, I think Lee Grable's point is important: The fact that we use the term «global
temperature» to
mean the
average temperature on a two - dimensional surface rather
than the three - dimensional ocean plus land plus atmosphere system of the earth has the potential to allow confusion.
* However, the same panel then concluded that «the warming trend in global -
mean surface
temperature observations during the past 20 years is undoubtedly real and is substantially greater
than the
average rate of warming during the twentieth century.
The combination of these factors
means it's much easier to interpolate anomalies and estimate the global
mean,
than it would be if you were
averaging absolute
temperatures.
Those extremes will come about more slowly
than the rise of
mean temperature, but I have seen zero models that suggests a continued rise of global
average with no rise of global high.
... Polar amplification explains in part why Greenland Ice Sheet and the West Antarctic Ice Sheet appear to be highly sensitive to relatively small increases in CO2 concentration and global
mean temperature... Polar amplification occurs if the magnitude of zonally
averaged surface
temperature change at high latitudes exceeds the globally
averaged temperature change, in response to climate forcings and on time scales greater
than the annual cycle.
More
than 95 % of the 5 yr running
mean of the surface
temperature change since 1850 can be replicated by an integration of the sunspot data (as a proxy for ocean heat content), departing from the
average value over the period of the sunspot record (~ 40SSN), plus the superimposition of a ~ 60 yr sinusoid representing the observed oceanic oscillations.
Global warming does not
mean no winter, it
means winter start later, summer hotter, as Gary Peters said «The global
average surface
temperature has risen between 0.6 °C and 0.7 °C since the start of the twentieth century, and the rate of increase since 1976 has been approximately three times faster
than the century - scale trend.»
Surface
temperatures in parts of Europe appear to have have
averaged nearly 1 °C below the 20th century
mean during multidecadal intervals of the late 16th and late 17th century (and with even more extreme coolness for individual years), though most reconstructions indicate less
than 0.5 °C cooling relative to 20th century
mean conditions for the Northern Hemisphere as a whole.
eg2 Similarly there are seasonal
temperature changes such that in winter the
average temp is ~ 10 - 20 degrees lower
than the
mean, and likewise the northern winter CO2 air concentration is 5ppm lower, thus changing the energy flow balance in winter vs summer and day vs night & north vs south.
Three of the four global
average temperatures indeed are decreasing in their trends (although the actual global
mean temperatures are still warmer
than the previous decades).
That would likely
mean that also the official UN climate goal of limiting the
average world
temperature rise to no more
than 2 degrees Celsius — a target linked to 450 ppm CO2 equivalent stabilisation scenarios (practically ambitious, theoretically weak)-- will eventually lead to many meters of global sea level rise.
During the drought years of 2012 — 2015,
mean monthly water
temperatures in the freshwater regions of the Delta from April to July were on
average higher
than between 1995 and 2011 (two - factor ANOVA, Bonferroni corrected P < 0.01), demonstrating the effects of drought on surface water
temperatures (Fig. 1B).
But
mean temperatures are expected to rise faster
than the global
average, decreasing crop yields, deepening poverty.
So while it was a generally warmer (and drier)
than usual winter it also wasn't the warmest ever, with the official NIWA statement being «The nation - wide
mean temperature was 1.2 °C above the winter
average, based on NIWA's seven - station
temperature series, making this the warmest winter on record since 1909.»
It's by no
means obvious that any «more natural»
average temperature would be better
than some less natural one.
Continuing the planet's long - term warming trend, globally
averaged temperatures in 2017 were 0.90 degrees Celsius (1.62 degrees Fahrenheit) warmer
than the 1951 to 1980
mean.
A «positive» anomaly
means the
temperature is warmer
than the long - term
average, a «negative» anomaly
means it's cooler.
Even the standard radiative GHG effect of 33 or something K is on very shaky ground, i
mean the explanation for higher
than black - body
temperature of the surface (the
average) using only radiative «forcing».
It is for these reasons that the concept of an «
average global
temperature» can be seen to have no more
than a political
meaning.
When the earth's
temperature rises on
average by more
than two degrees, interactions between different consequences of global warming (reduction in the area of arable land, unexpected crop failures, extinction of diverse plant and animal species) combined with increasing populations
mean that hundreds of millions of people may die from starvation or disease in future famines.
The warm anomalies in June lasted throughout the entire month (increases in monthly
mean temperature of up to 6 to 7 °C), but July was only slightly warmer
than on
average (+1 to +3 °C), and the highest anomalies were reached between 1st and 13th August (+7 °C)(Fink et al., 2004).
I am still waiting for word on what the global
temperature anomaly for the month was, but I suspect it will be fairly close to normal, which
means that on
average the
temperature of the Earth will come in at ~ 12.0 °C which is 4 °C colder
than it will be in 6 months from now, but because of how they talk about
temperature, I will be the only one pointing out the difference between the actual
temperature and the anomaly
temperature.
The steady increase in global
temperatures, including
average temperatures in Australia,
means that even when rainfall is at or near the historical
average, conditions are drier
than before because evaporation rates are higher.
Although the regions largely coincide with the continents rather
than climatological criteria, the annual
mean temperature averaged over these regions explains 90 % of the global
mean annual
temperature variability in the instrumental record»
In the opinion of the panel, the warming trend in global -
mean surface
temperature observations during the past 20 years is undoubtedly real and is substantially greater
than the
average rate of warming during the twentieth century.
The link between a regional climate variable such as
mean temperature and the
average behaviour of a sample of trees is one step more statistical
than the link between local weather and an individual tree.
Actually, a warmer world
means higher levels of humidity, less drought and a shrinking of deserts, as in the Sahara circa 4,000 - 6,000 years ago during the era known as the climatic optimum when
temperatures averaged some 2 degrees higher
than today's.
This
means that if you are younger
than 38 years old, you've never experienced a year in which the global
average surface
temperature was below
average.
They point out that if we assume the data are normally distributed, then the July 2010
average temperature anomaly value was more
than 4 standard deviations above the July
mean (and they have a lovely graph to emphasize it):
So over the full course of a day the
average temperature is lower on cloudy day
than on clear days and why tropical deserts have the highest
mean annual
temperature of any climate type.
But
mean temperatures are expected to rise faster in the continent
than the global
average, decreasing crop yields and deepening poverty.
When someone talks about climate change and warming in particular it would only make sense if they
meant that the
average temperature accross the earths surface is warmer
than it used to be at some point in the past.
In contrast, meteorological data collected from three nearby coastal stations (Brevoort Island, Cape Dyer, and Resolution Island) between 1950 and 1992 indicated that the
mean minimum and maximum air
temperatures for the month of April are normally 10 - 20 °C cooler
than the
averages we recorded at our camp.
but this occurred under significantly different orbital forcing conditions» This is to make us believe that a global
mean temperature could drive the melting or calving of the Greenland; but the Eemian diminution of the Greenland ice cap is by no
means related to an
average global
temperature but to the local summer insolation that during the last interglacial was up to 30 W / m ² to 60 W / m ² stronger
than today's.
When the SAM is in a positive phase —
meaning that the belt of winds is stronger
than average — it has a cooling effect on Antarctic surface
temperatures.
The shade of red in the Arctic hot spot
means that today's
temperature is 35 degrees F «hotter»
than that normal
average.
22 Land areas are projected to warm more
than the oceans with the greatest warming at high latitudes Annual
mean temperature change, 2071 to 2100 relative to 1990: Global
Average in 2085 = 3.1 o C
That would likely
mean that also the official UN climate goal of limiting the
average world
temperature rise to no more
than 2 degrees Celsius — a target linked to 450 ppm CO2 equivalent stabilisation scenarios (practically ambitious, theoretically weak)... Continue reading →
Provisional figures for Yorkshire show it was much wetter
than normal, but with a marked contrast temperature-wise from west to east, with
mean temperatures in the east not actually far from the seasonal
average.
Longyearbyen on the Norwegian island of Spitsbergen, one of the northernmost towns in the world, repeatedly experienced monthly
mean temperatures more
than 6 °C above the 1981 — 2010
average.
And since the Arctic (more so
than the Antarctic) is warming faster
than the global
average, the lack of data there may
mean that the global
average temperature trend may be underestimated.
When it is warmer
than the climatological
average (and therefore a positive
temperature anomaly) in a particular location, it is generally also warmer
than average over hundreds of kilometres — corresponding to the
mean synoptic weather pattern — even though the actual
temperature may be quite different from location to location.