Could they be the reason for the nearly flat global
mean surface temperature for the last ten years.
Standard deviation of local June — July — August (Upper) and December — January — February (Lower)
mean surface temperature for 30 - y periods 1951 — 1980 (Left) and 1981 — 2010.
Units are °C global
mean surface temperature for °C change in SST within the partition element.
We obtain an absolute temperature scale using the Jones et al. [69] estimate of 14 °C as the global
mean surface temperature for 1961 — 1990, which corresponds to approximately 13.9 °C for the 1951 — 1980 base period that we normally use [70] and approximately 14.4 °C for the first decade of the twenty - first century.
According to Ward's full commentary, accepted for publication in the same journal as Lomborg's paper, «Projections of global
mean surface temperature for the period up to 2100 are based on cumulative annual global emissions of greenhouse gases up to the end of the century.
Also, were you to speak without your scientific cap on, how much trust do you have in this type of model to predict
mean surface temperature for the next five or ten decades (given an emission scenario following Hoffman).
how much trust do you have in this type of model to predict
mean surface temperature for the next five or ten decades (given an emission scenario following Hoffman).
Image to right — Looking at Average Monthly Global Temperatures: This is a global map of unusual (anomaly) monthly -
mean surface temperatures for the year 2004 relative to the 1951 - 1980 baseline.
Not exact matches
Calculations indicate that in several ways it is quite an Earth - like planet: its radius is 1.2 to 2.5 times that of Earth; its mass is 3.1 to 4.3 times greater; and, crucially, its orbit lies within its star's «Goldilocks zone», which
means its
surface temperature is neither too hot nor too cold
for liquid water - and therefore potentially life - to exist on its
surface.
Maps of median TAE averaged across 23 model simulations
for (a) and (b)
mean surface air
temperature, (c) and (d) highest daily maximum
temperature, (e) and (f) lowest daily minimum
temperature, (g) and (h) total precipitation, and (i), (j) maximum 1 - d precipitation
for (a), (c), (e), (g) and (i) June - August and (b), (d), (f), (h) and (j) December - February.
The IPCC, in its most recent assessment report, lowered its near - term forecast
for the global
mean surface temperature over the period 2016 to 2035 to just 0.3 to 0.7 degree C above the 1986 — 2005 level.
For the change in annual
mean surface air
temperature in the various cases, the model experiments show the familiar pattern documented in the SAR with a maximum warming in the high latitudes of the Northern Hemisphere and a minimum in the Southern Ocean (due to ocean heat uptake)(2)
Given that we're mainly looking at the global
mean surface temperature anomaly, the most appropriate comparison is
for the net forcings
for each scenario.
Global
mean temperatures averaged over land and ocean
surfaces, from three different estimates, each of which has been independently adjusted
for various homogeneity issues, are consistent within uncertainty estimates over the period 1901 to 2005 and show similar rates of increase in recent decades.
It is also tidally locked to its sun,
meaning that its day side is constantly exposed to stellar radiation and its
surface temperature is too hot
for water and CO2 molecules to form.
«Solar cycle variability may therefore play a significant role in regional
surface temperatures, even though its influence on the global
mean surface temperature is small (0.07 K
for December — February).»
However, comparison of the global, annual
mean time series of near -
surface temperature (approximately 0 to 5 m depth) from this analysis and the corresponding SST series based on a subset of the International Comprehensive Ocean - Atmosphere Data Set (ICOADS) database (approximately 134 million SST observations; Smith and Reynolds, 2003 and additional data) shows a high correlation (r = 0.96)
for the period 1955 to 2005.
For example, the global -
mean near -
surface air
temperature was more than 1 K lower than in the experiment assuming spherical snow grains.
He then uses what information is available to quantify (in Watts per square meter) what radiative terms drive that
temperature change (
for the LGM this is primarily increased
surface albedo from more ice / snow cover, and also changes in greenhouse gases... the former is treated as a forcing, not a feedback; also, the orbital variations which technically drive the process are rather small in the global
mean).
We quantify the interannual - to - decadal variability of the heat content (
mean temperature) of the world ocean from the
surface through 3000 - meter depth
for the period 1948 to 1998.
[9]
Temperature changes Global mean surface temperature difference from the average for 1880 &m
Temperature changes Global
mean surface temperature difference from the average for 1880 &m
temperature difference from the average
for 1880 — 2009.
Because the
surface area of a paw pad is so small, releasing heat exclusively from the pads is an inadequate
means for cats to cool themselves and maintain normal body
temperature.
When differences in scaling between previous studies are accounted
for, the various current and previous estimates of NH
mean surface temperature are largely consistent within uncertainties, despite the differences in methodology and mix of proxy data back to approximately A.D. 1000... Conclusions are less definitive
for the SH and globe, which we attribute to larger uncertainties arising from the sparser available proxy data in the SH.
The
surface temperature increase that partially gave rise to concerns about global warming coincided with a move to tethered electronic measuring devices (um, I think that
means thermometers) that forced the movement of many stations closer to buildings and developed areas, causing warming that may not have been corrected
for.
Overall, ecosystem - driven changes in chemistry induced climate feedbacks that increased global
mean annual land
surface temperatures by 1.4 and 2.7 K
for the 2 × and 4 × CO2 Eocene simulations, respectively, and 2.2 K
for the Cretaceous (Fig. 3 E and F).
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.
Actually,
for attribution studies you need to go beyond the global
mean surface temperature and see how the resultant forcings leave their fingerprint in both time and space.
Figure 1.4 http://cybele.bu.edu/courses/gg312fall02/chap01/figures/figure1.4.gif shows the natural variability of the annual
mean surface temperature on several different spatial scales from a climate model simulation
for 200 years.
While this is reasonable
for looking at changes over time, it is certainly not an estimate of the true
mean of the
surface temperature of the globe.
Why is this approach not much used
for estimating global
mean surface temperature change?
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.
I also quarrel with the idea that a historical «record» of the earths
mean surface temperature exists either now or can be reconstructed
for 1850 etc..
However, the CRU global
mean combined land air / sea
surface temperature estimates
for Jan - Aug 2005 lag behind the 1998 annual
mean estimate by 0.08 C (0.50 C vs. 58C
for 1998) while GISS indicates a lag of 0.02 C.
Thus, given the height and value of the emission
temperature, we can get a simple estimate
for the
surface temperature: 255K + 5.5 km * 6K / km = 288K (= 15oC; close to the global
mean estimated from observations given by NCDC of ~ 14oC).
In this case the CO2 concentration is instantaneously quadrupled and kept constant
for 150 years of simulation, and both equilibrium climate sensitivity and RF are diagnosed from a linear fit of perturbations in global
mean surface temperature to the instantaneous radiative imbalance at the TOA.
Given that we're mainly looking at the global
mean surface temperature anomaly, the most appropriate comparison is
for the net forcings
for each scenario.
There is already a natural GHE that, together with other atmospheric effects, can account
for about 32oC higher global
mean surface temperature.
You stated: «Thus, given the height and value of the emission
temperature, we can get a simple estimate
for the
surface temperature: 255K + 5.5 km * 6K / km = 288K (= 15oC; close to the global
mean estimated from observations given by NCDC of ~ 14oC).»
For the «business - as - usual» scenario RCP8.5, the model - mean changes in 2090s (compared to 1990s) for sea surface temperature, sea surface pH, global O2 content and integrated primary productivity amount to +2.73 °C, − 0.33 pH unit, − 3.45 % and − 8.6 %, respective
For the «business - as - usual» scenario RCP8.5, the model -
mean changes in 2090s (compared to 1990s)
for sea surface temperature, sea surface pH, global O2 content and integrated primary productivity amount to +2.73 °C, − 0.33 pH unit, − 3.45 % and − 8.6 %, respective
for sea
surface temperature, sea
surface pH, global O2 content and integrated primary productivity amount to +2.73 °C, − 0.33 pH unit, − 3.45 % and − 8.6 %, respectively.
I
for one would like to see a follow up of the current work by Dr. Benestad that more clearly defines the
means of «cause and effect» and how this is resulting in high
surface temperatures.
-- What's the
mean avg growth in global CO2 and CO2e last year and over the prior ~ 5 years — What's the current global
surface temperature anomaly in the last year and in prior ~ 5 years — project that
mean avg growth in CO2 / CO2e ppm increasing at the same rate
for another decade, and then to 2050 and to 2075 (or some other set of years)-- then using the best available latest GCM / s (pick and stick)
for each year or quarter update and calculate the «likely» global
surface temperature anomaly into the out years — all things being equal and not assuming any «fictional» scenarios in any RCPs or Paris accord of some massive shift in projected FF / Cement use until such times as they are a reality and actually operating and actually seen slowing CO2 ppm growth.
I wonder what the increase in global
mean surface temperature is
for the decade 1994 to end of year 2004 (thus, not counting Pinatubo) as compared to the longer term trend since 1880 or so.
«The average global
temperature anomaly
for combined land and ocean
surfaces for July (based on preliminary data) was 1.1 degrees F (0.6 degrees C) above the 1880 - 2004 long - term
mean.
In the standards
for middle school,
for example, one of the core ideas is that «human activities, such as the release of greenhouse gases from burning fossil fuels, are major factors in the current rise in Earth's
mean surface temperature («global warming»).»
(The global
mean surface air
temperature for that period was estimated to be 14 °C (57 °F), with an uncertainty of several tenths of a degree.)
The climate sensitivity is defined as the equilibrated change in global
mean surface air
temperature (SAT)
for a given change in radiative forcing and has been a major focus of climate research over the last three decades.
3) Under the assumption of radiative equilibrium, it can be shown that the
surface temperature of a planet would slightly and non linearily increase with the concentration of IR active gases (primarily H2O) if and only if radiation was the only
mean for energy transfer.
The code currently starts from the annual -
mean data
for the
surface, upper - air, and deep - ocean
temperatures that were extracted from the MIT IGSM model output files.
Closing Note: The additional problems with measuring and calculating global
mean sea
surface temperature are discussed at length in numerous posts at ClimateAudit and in the papers that are the subjects of or the references used
for those posts.
There will be deep philosophical and ethical differences on whether we have the right to coerce billions of people
for an unclear likelihood of preventing a 2 - 4 C increase in global
mean surface temperatures by 2100.