QUESTION: If this hypothetical +0.03 C per
decade trend line for the seven hottest peak years on record between 1998 and 2028 stayed within the CMIP5 min - max boundary line, as shown on the above graphic, could climate scientists justifiably claim in the year 2028 that «global warming» a.k.a. «climate change» had occurred on schedule according to AR5's climate model predictions?
Not exact matches
If retirement income is to fall, then, it will take an epic reversal of economic
trend lines that have been in place for
decades (not to mention a reversal of the growing political clout of the senior vote).
Particularly striking is the mortality
trend line for tuberculosis, which falls precipitously from 1838 onward —
decades before the bacterium responsible for the disease was identified (1882), and long before the advent of the first effective antibiotic therapy, streptomycin.
While the decline in IPO transactions for venture - backed companies in the 2000s is dramatic, the rise in M&A transactions has more than offset the losses such that there is a healthy
trend line of positive exits over the three
decades.
New England is consistently lower (when you create a
trend line it is more clear) than the rest of the country, but something happend in the middle of the last
decade.
Although it has been profitable to take the over in high - scoring games this season, this does not
line up with historical
trends that we have identified over the past
decade.
When they corrected the error, Wentz and Schabel derived a warming
trend of about 0.07 °C per
decade, more in
line with surface thermometers and climate models.
After reanalyzing data collected between 1979 and 2001, the team found that the tropospheres temperature has risen by about two tenths of a degree Celsius (almost one third of a degree Fahrenheit) each
decade, bringing it in
line with the surface
trend.
...» Could go into hiding for
decades» study finds — Discovery.com — March 2, 2009 — And See: «Global temps have flat
lined since 2001... This is nothing like anything we've seen since 1950... Cooling
trend could last for up to 30 years» — June 22, 2009)
Many education reformers look at results for the National Assessment of Educational Progress (NAEP) and other macro measures and see some positive
trend lines in recent
decades.
The area between the two
trend lines shows the «reform dividend,» which totals to $ 2.5 trillion in the two
decades after the release of Risk.
The academic achievement of elementary and secondary students from the 1970s through to the current
decade is shown through the unique Long - term
Trend Assessments, but the usefulness of that
trend line measurement is imperiled by a proposed delay of 12 years until its next administration.
Subaru of America, Inc. for 2007 is expanding the market reach of its
trend - setting Outback
line, the vehicle that launched the crossover category more than a
decade ago.
In
line with other recent reappraisals of the culture of the British underground scene (most recently an exhibition of drawings by doomed club kid Trojan at the ICA), Bowie Nights at Billy's Club, London, 1978 forms a revealing portrait a half - forgotten milieu that presaged the cultural
trends of the following
decades.
The aa - index is represented by the blue
line, and the corresponding
trend of 1.5 + / - 0.4 /
decade is associated with a p - value of 0.0002 (highly statistically significant).
In April 2002, for example, their satellite temperature
trend was only 0.04 Â °C /
decade, compared with 0.17 + / - 0.06 Â °C /
decade from surface measurements; however, in the years since the UAH
trend has roughly doubled to come more in
line with other
trends.
The two straight
lines in the graph in your original post are not, if I've understood correctly, both significant, only the one using non-detrended data (continent - wide mean
trend 0.12 + / - 0.07 deg C per
decade).
Given the decadal averages and the issue of what is meant by «the next»
decade, Romm does have a point that the result of the paper could more clearly be described as representing «a period of flat global mean temperatures extending somewhat into the coming
decade, following by a very rapid rise in temperature leaving the planet on its long - term
trend line by 2030.»
Since 1996 we can do that and we find a series of higher lows that align perfectly on a
trend line of 0.14 C /
decade and since 1998 we have a perfectly aligned series of higher highs on a 0.4 C /
decade trend.
(c) The global mean (80 ° N to 80 ° S) radiative signature of upper - tropospheric moistening is given by monthly time series of combinations of satellite brightness temperature anomalies (°C), relative to the period 1982 to 2004, with the dashed
line showing the linear
trend of the key brightness temperature in °C per
decade.
The
trend lines quantify the impact of the biases on the HadCRUT3
trend, and have slopes of between 0.09 and 0.11 °C /
decade.
An objective post on this would have started by showing the annual temperature
trend, such as this with 2014 short - term averages added in http://www.woodfortrees.org/plot/hadcrut4gl/mean:12/from:1950/plot/hadcrut4gl/from:1970/
trend/plot/hadcrut4gl/from:2014/mean:3 We would note that the
trend is 0.16 C per
decade since 1970, that the temperature mostly does not follow the
trend but oscillates equally to about 0.1 C on each side, and that 2014 has returned to the long - term
trend line in much the same way as several other cooler periods have.
And you are still hung up on saying that you can claim there is slight cooling for the past 15 years when that is not statistically significant, try 30 year
trends which are statistically significant and in
line with the IPCC's about 0.2 C per
decade trend.
For purposes of the scenario, the hypothetical calculated
trend line for those seven consecutive peak years is chosen to run at +0.03 per
decade starting from 1998, thus producing the «seven consecutive hottest peak years on record» between 1998 and 2028.»
Some — instead of calculating the
trend — simply draw a
line between these two years *, and for unapparent ** reasons that is not just opportunistic climate skeptics, but also real climate scientists with a funny definition of
decades.
In this figure, Nielsen - Gammon has added linear
trend lines to each ENSO category, and he notes that they all correspond to warming
trends of about 0.16 °C per
decade.
As described in the paper, climate warming specifically refers to the slow time evolution of the local July temperature as described by a smooth non-linear
trend line, which reveals a significant climatic warming over the last three
decades.
The Marcott study is one that raised a stink because it was an attempt to create yet another «hockey stick» graph in which all of human history — this time, going back 11,000 years — shows a flat
line of global temperatures, with only recent
decades showing an alarming upward
trend like the blade of a hockey stick.
Although not as exceptional as the values for February 2016 and February 2017, it was in
line with the upward
trend of 0.18 °C per
decade seen in global temperature data from 1979 onwards.
Eight (8) respondents suggest a return toward the long - term
trend line of summer sea ice loss (pre-2007 long - term
trend of approximately 10 % loss per
decade),
Although not as exceptional as the values for March 2016 and March 2017, it was in
line with the upward
trend of 0.18 °C per
decade seen in global temperature data from 1979 onwards.
Although not as exceptional as the values for April 2016 and April 2017, it was in
line with the upward
trend of 0.18 °C per
decade seen in global temperature data from 1979 onwards.
The warming
trend is about a tenth of a degree per
decade, very much in
line with what all those crazy mainstream climate scientists say.»]-RSB-
Note also how none of the 8 - year
trend lines point downwards in the last
decade or so.
Some excerpts copied for your info: Because of a dearth (
line 42) of quality precipitation data, it is very difficult to assess whether precipitation
trends over the past few
decades in the Arctic drainage areas also show an increase (ACIA, 2005).
The
trend lines for min temperatures on windy and calm time periods for 290 stations over the time period from 1950 - 2000, while intersecting the y axis at significantly different points (the windy
trend lines always showing higher temperatures but the amount can depend on season), both
trend at a 0.20 degree C per
decade rate.
If the emergence of the divergence continues to grow for a couple more
decades and the
trend lines of temperatures and CO2 separate, I wonder who will be telling whom they think they know more than they do.
The fit of a
trend line to the time series of global - mean surface temperature (e.g., Figure 2.5) indicates a warming between 0.25 to 0.4 °C for this 20 - year period, or approximately 0.1 to 0.2 °C per
decade, 6 depending upon which of the existing data sets is used to represent the surface temperatures, and exactly how the fitting is done.
This result indicates, since the GMT record begun, the GMT behaved like a stable pendulum with the two GMT boundary
lines that are 0.5 deg C apart as the end points of the pendulum's swings, and the long - term global warming
trend line of 0.06 deg C per
decade as the pendulum's neutral position.
But can you point to a half century at any time in the past millennium where fitting a
trend line gives a slope (up or down) of anywhere near a degree per century (0.01 degrees per year or 0.1 degrees per
decade)?
Also, the
line that bisects the vertical space between the two GMT boundary
lines is nearly identical to the long - term global warming
trend line of 0.06 deg C per
decade for the data from 1880 to 2010.
Within the space afforded by using two times the standard error you will be able to draw
trend lines that are indistinguishable from previous recent
decades, and they will be as «valid» as the «statistically flat»
trend Dr. Whitehouse assures us is in this data.
Black
line shows smoothed
trend accounting for variation within a
decade.
Detrending by 0.06 C shows a flat
trend line for 18 consecutive years so decadel
trend is way below significant (significant begins at 0.1 C /
decade).
Basil, the
trend line in the HadCRUT4 plot indicates a warming of roughly 0.1 C per
decade between 1999 and 2014.
The
trend line has value of 0.117 °C /
decade which amounts to a total temperature increase of 0.702 C over the 60 years from 1950.
While the
trend lines may be quite persuasive, and a useful shorthand for the characteristic direction of the temperature, we see that over and over (up to almost 1 / 3rd of all running
decades) in the clearly rising
trended climate post 1930 a negative or non -(unambiguously *)- rising
trend (* within error bars).
Use the same decadal
trend line logic to analyze temperature data back a century, and we find more than one
decade with an actual negative slope where the 30 - year
trend is positive and it is generally agreed the overall temperature
trend is rising.
The global surface temperature
trend from January 1970 through November 2012 (the red
line) is 0.16 °C per
decade.
... Move on people nothing to see here... A few
lines away from his
trend comments, Monckton acknowledges that the last
decade was the warmest on record but indicates that it is part of a
trend of 300 years of global warming.