Use these controls to limit the stations used with other functions.
To reset the filter, set a new baseline period - this clears the filter and computes a new baseline
Use the additional range fields to require a few years near one date
and a few near another
The checkboxes are used to define the default filter used when
is clicked.
Default Filters
From
To
With at Least this many measurements within the range
Click button to apply
Set baseline
If any of the 3 checkboxes - Align stations on common baseline, Filter stations,
Hide filtered sites - is selected,
then Hi/Lo uses only the non-filtered stations.
For instance, of the 5,255 available GHCN adjusted land sites,
Of those, only 4567 have 15 years of data between 1961 and 1990
Of those, only 1000 have 8 years of data between 1900 and 1910
Of those, only 520 have 8 years of data between 2000 and 2010
To display individual sites in the lower plot, select *station* and click on the site.
To display purple (restricted) sites in the lower plot, turn off *Align stations on common baseline*.
Filters
stations where
between
and
Compute options on period from
to
BELGRANO
This base was moved, but the 8C temperature increase was not corrected
TULCAN/EL ROS
There is a major 10°C discontinuity in the data
Ship data
There are 7 ships included with the land data.
Only ship M has enough data to be of any value.
Station data
ID
Click on a station to populate this
The first 3 digits indicate the country
Name
Lat
Long
Pop Type
Rural/Semi/Urban - Station type by size of nearest town
Light Type
Rural/Semi/Urban - Station type by light seen from space
There is no simple translation to their ID's - so search
# found
Adding the baseline to the difference is controlled via the Plot Controls tab
Plot Controls
Set plot limits
Control Chart
y max y min
x min
x max
Stations plot
(Adj minus Raw)
(Adj minus Raw plus Adj_baseline)
This is good for looking at small regions and/or countries
Hi/Lo plot
Averages plot
Trend Lines
Trend line formulas - currently, only on Hi/Low graph
Just fit a line to the end points
y = (y0 + 273.15)exp( (t-t0)/k ) - 273.15
y = (y0 - ymin + 0.1)exp( (t-t0)/k ) + ymin - 0.1
to
- Minimum number of years required to produce a linear regression
Normally, the trend line is fitted to the displayed, averaged data.
A full regression fits the trend line to all the data (perhaps 200,000 points), not just the plotted data (about 100 points).
As a result, the slope and the R2 values will be different.
using all the data points from all stations
The Null Hypothesis is that the temperature change is indistinguishable from zero.
For this to be true, ....
Load Local Data
Load data files from local storage.
While the button shows all the files in a directory,
only xml files with the predefined names will be read. Therefore, you can simply select them all.
Once a file is loaded, it will not try and load it again.
Because of how javascript security is implemented, there is no way to load data from a local storage device unless
the user manually selects the files via
an input files control .. which is what this page provides.
Standard deviation (σ)
This applies only to the plot with the number of stations (sites) chart displayed at the bottom
The values are not meaningful if the average is "Corrected for station distribution"
To produce an approximately unbiased estimator of the standard deviation of an average of averages,
the divisor should be (N - 1.5)
N is the number of stations selected
Creates a biased estimate
Creates an unbiased estimate when applied to a variance or a mean
Approximates an unbiased estimate when applied to a standard deviation of averages
Map Trends
Select a station coloring scheme for the map
This is the default showing which stations are selected
Not selected - red (land) blue (ocean) / Selected - green (included) purple (excluded)
Just use the end points to see if the most recent date is warmer (red) or colder (blue) than the earlier date
Is the most recent date warmer (red) or colder (blue) than any previous maximum?
Is the most recent date warmer (red) or colder (blue) than any previous minimum?
Is the trend warmer (red), colder (blue), or within +/- delta of zero (green)?
Compute trends on period from to
Delta °C/decade per bin
The delta value is used to apply a window to the "null" condition.
In the case of the trends - a slope within +/- delta of zero is considered to be zero (colored green)
In the other cases, if the 2 values are within +/- delta of of each other, they will be
considered equal (colored green)
A white circle indicates
For Endpoint delta, Previous High, and Previous Low -
a lack of data at one, or both, of the specified dates
For the Trend - not enough samples in the range - required number set on Trend Lines tab
The
UCAR Simple Climate Model
predicts how much the temperature will increase for an increase in CO2 -
however, their data actually demonstrates that the model is wrong.
By default, only the data after 1900 is shown in the Hi/Lo graph and,
with a sensitivity of 3 or 4 and using 1975 as the base year,
the agreement between the theory and the actual data is pretty good.
However, the complete UCAR "historical data" is a poor match to the theory -
when data from the previous century is included
(use the checkbox),
the correlation is terrible.
The Keeling data
(1958 to present - only the August averages are plotted)
is almost identical to the UCAR data for that period.
By default, the Plot Controls tab limits this to 1900
Temperature offset
°C
- only anomalies are provided, add this to compare with actual temperatures
11 °C compares well with 100 year data (set via Basic Filters tab)
14 °C compares well with UCAR data (CO2 tab)
Functions to compare Raw and Adjusted data
Both the Raw (Unadjusted) and Adjusted data must be loaded for these functions to work.
Select a station coloring scheme for the map
The adjusted trend is warmer (red) or colder (blue) than the unadjusted trend
Green means they are close
- Light grey means they are identical
Delta °C/decade per bin
Red - The adjustment converted a negative slope into a positive slope
Blue - The adjustment converted a positive slope into a negative slope
Green means the slopes are close
- Light grey means the slope signs are identical
Delta °C/decade per bin
The adjusted mean is warmer (red) or colder (blue) than the unadjusted mean
Green means they are close
- Light grey means they are identical
Delta °C baseline average per bin
This compares the baselines defined via the dates on Basic Filters tab
The adjusted baseline is warmer (red) or colder (blue) than the unadjusted value
Green means they are close
- Light grey means they are identical
Delta °C baseline average per bin
The adjusted data frequently has fewer years than the raw
Delta years per bin
Identical raw and adjusted station values are light grey, the rest are red.
Perform the analysis on the period from to
Filters to help compare Raw and Adjusted data
The features on this page will not functional unless both an adjusted and an unadjusted (raw) pair
of datasets is loaded.
Note that all the adjusted stations match a raw station,
but that there are 294 more raw stations than adjusted stations.
stations that are
(raw has 294 more than adj)
(761 land based stations)
stations where the change in
between
and
Compute options on period from
to
Islands
Select or filter for islands
with relatively small land areas
and use them as proxies for ocean temperatures.
Each island is associated with a nearby ocean "station".
The ocean values are fairly bogus - the same values are in the raw and adjusted databases.
Years of data
Between
99
1900 to 2010
50
1950 to 2010
Limit stations to 50 years of data from 1950 to 2010
These are just for development
Histograms
Option
Bin Size
Show data for the period
to
Number of sites included
excluded
The data range for computing the Baseline Average Temperature is set on the
Basic Filters tab
Bin Color Definitions
Bin Colors are normally used on dot-maps
- these controls allow you to define them.
Slopes are normally between +/-0.3°C/decade
Deltas are normally between +/-2°C
Anomalies are normally +/-2°C
Adj-Raw are normally +/-2°C
Temperatures are from -20°C to 50°C
Counts are from zero to 5,000
The following options only work with the
Map Data, Raw vs Adj, and Ani tabs
For the Slopes, Anomalies, and Adj-Raw ranges, I prefer the extremes to be red and blue,
the values near zero to be green,
and the values that are exactly zero to be grey.
Slopes
Adj - Raw
Temperatures
Color
+inf
+inf
+inf
-inf
-inf
-inf
Map Markers
Define the Map stations markers
Marker
Line Color
Fill Color
Size
Unselected
Selected
Filtered
Data Map Unselected
Ocean Selected
Ocean Unselected
Failed Baseline
Color Code Station Data
Select a station coloring scheme for the map
Data
Bin size
Date range
°C/decade
Show data for the period
to
years
°C
This shows the baseline temperatures Use the date range on the Basic Filters tab
Set the colors and number of steps via the Bin Colors tab
This is the default showing which stations are selected
Not selected - red (land) blue (ocean) / Selected - green (included) purple (excluded)
xy Scatter Plots
Number of selected sites included
excluded
Option
Axis
Bin Size
Y
X
x-axis selection
Show data for the period
to
These control the Number of Counts per Bin color code
Marker size
The data range for computing the Baseline Average Temperature is set on the
Basic Filters tab
Animations
Select a station coloring scheme for the map
Data
Bin size
Controls
°C
Show data for the period
to
°C
°C
°C
Set the colors and number of steps via the Bin Colors tab
This is the default map coloring showing which stations are selected
Not selected - red (land) blue (ocean) / Selected - green (included) purple (excluded)
Current year
Speed
x 0.01 sec/update (100 = 1 second)