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 Station
to
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 FiltersFromToWith 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 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
    The date range used with the options is set on the Map Trends tab
    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 set the map selection mode to Station The first 3 digits indicate the country
    Name click on a staion to populate this  
    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
    Temperature
    (°C)
    min avg max  
    0 0 0
    ghcn plots These show raw and adjusted data
    Search Berkeley Earth There is no simple translation to their ID's - so search

       

Plot Controls

    Set plot limits
    Control Charty max
    y min
    x minx max




    Toggle the chart selections to apply new values
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

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

    Select an alternate map
    This is the default map
    Deserts, Forests, Ice, and more ref
    The Earth at night ref

UCAR and Keeling CO2 Data

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.




Sensitivity - ΔT when CO2 is doubled

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
    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
    The date range used with the options is set on the Raw vs Adj tab

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


This application plots a graph that requires the HTML5 canvas component.
As a result, you need a more modern web browser, sorry!

The data range for computing the Trend is set on the Map Trends tab
The data range for computing the Baseline Average Temperature is set on the Basic Filters tab

Gradient Definitions

Color gradients are normally used on heatmaps - these controls allow you to define them.

  • Slopes are normally between +/-0.3°C/decade
  • Anomalies are normally between +/-2°C
  • Temperatures are from -20°C to 50°C

For the Slopes and Anomalies, 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.

   

Currently, the following options only work with the Raw vs Adj tab

   
   
   


Slopes Anomalies Temperatures Color
+inf +inf +inf
-inf -inf -inf

Map Controls

    Define the Map stations markers
      Marker Line Color Fill Color Size
    Unselected
    Selected
    Filtered
    Heat Map
    Unselected
    Ocean
    Selected
    Ocean
    Unselected
    Failed Baseline

Temperature Heat Map

    Select a station coloring scheme for the map
    This shows the average temperatures using the date range below
    This shows the average temperatures using the date range below
    This shows the average temperatures using the date range below
    This shows the baseline temperatures using the date range on the Basic Filters tab
    Compute temperature averages on period from to   Delta °C/bin