CRU : Research and Projects : BETWIXT
Daily time-series output and figures from the CRU weather generator
Daily time-series output and output from the CRU weather generator for 11 UK sites can be downloaded from the tables below.
This weather generator is described in
BETWIXT technical briefing note 1.
Evaluation of performance for the present-day (i.e., evaluation of the control period results) is described in
BETWIXT technical briefing note 4.
Construction of the scenario runs (which are consistent with the
UKCIP02 scenarios)
and evaluation of the simulated changes will be described in two further technical briefing notes.
The CRU weather generator is stochastic in nature, i.e., a different time series is produced each time it is run.
Thus it is important to use output from multiple runs when evaluating performance
(see BETWIXT technical briefing note 4)
or scenario changes.
For BETWIXT, the CRU weather generator has been run 100 times for each simulation set.
A single time series has then been selected from the middle of the distribution of each simulation set for inclusion in the table below.
Output is available for
- the '1970s' control period (i.e. 1961-1990),
- the '2020s' (i.e. 2011-2040),
- the '2050s' (i.e. 2041-2070) and
- the '2080s' (i.e. 2071-2100)
for the Low, Medium-Low, Medium-High and High emissions scenarios.
The weather generator time-series output and figures are available for public use, provided that the BETWIXT project is duly acknowledged.
The BETWIXT co-ordinator (Clare Goodess)
would like to be informed about any use of the data or figures outside the
Building Knowledge for a Changing Climate programme.
Time series data
Each file contains 30 years of simulated daily data for eight variables:
- RN: precipitation in mm
- TN: minimum temperature in degrees Celsius
- TX: maximum temperature in degrees Celsius
- VP: vapour pressure in hecta-Pascals
- RH: relative humidity in %
- WN: wind speed in ms-1
- SS: sunshine in hours
- PET: reference potential evapotranspiration.
The first four columns give: the station ID number; the year; the month; and the day.
The weather generator is stochastic in nature, i.e., simulated years do not correspond to a 'real' year, thus the years are numbered 0001 to 0030 in all simulations.
All years have 365 days, i.e., leap years are not included.
The first line of each file gives the site latitude and longitude.
* The observed data require further processing and re-formatting before weather generator output can be produced for Herstmonceaux. The nearest available site is Gatwick.
Figures
Three sets of figures are provided, as described below.
Each figure is available as a GIF for immediate viewing,
a PDF and EPS for high-quality, and a CSV with self-explanatory
column headings for loading into a spreadsheet.
In all figures, observed values (blue crosses) are the mean
for the period shown in Table 2 of
BETWIXT technical briefing note 1
(i.e., usually 1961-1990).
The simulated values (red for the 1961-1990 control period
and black for the scenario periods) are the mean of 100 30-year
weather generator runs (red/black dots).
The red/black lines and bars show the variability of
the 100 series (plotted as plus/minus two standard deviations
around the mean).
The control period figures are reproduced and discussed in
BETWIXT technical briefing note 1.
A technical briefing note describing the scenario figures
is in preparation.
Set 1: Precipitation and temperature statistics
- Proportion of dry days
- Mean wet day precipitation (mm day-1)
- Interannual variability of half monthly precipitation totals (mm day-1)
- Minimum temperature (°C)
- Maximum temperature (°C)
Set 2: Other variables
- Sunshine (hours)
- Wind speed (ms-1)
- Vapour pressure (hPa)
- Reference potential evapotranspiration (mm day-1)
Set 3: Extremes
Winter (DJF), spring (MAM), summer (JJA), autumn (SON) and the year as a whole (ANN)
values for the following variables (which are defined in Table 3 of
BETWIXT technical briefing note 4):
- Fraction of total precipitation from intense events
- Maximum number of consecutive dry days
- Number of "Hot days"
- Heatwave duration
- Number of "Warm nights"
- Number of "Cold nights"
| Emissions scenario | | Control | | Low | | Medium Low | | Medium High | | High |
|---|
| Time period | 1970s | 2020s | 2050s | 2080s | 2020s | 2050s | 2080s | 2020s | 2050s | 2080s | 2020s | 2050s | 2080s |
|---|
| Lat | Long |
|---|
Bradford
 ALL FIGURES
 ALL FILES | 53.82
| -1.77
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Coltishall
ALL FIGURES
ALL FILES | 52.77
| 1.35
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Elmdon
ALL FIGURES
ALL FILES | 52.45
| -1.73
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Eskdalemuir
ALL FIGURES
ALL FILES | 55.32
| -3.20
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Gatwick
ALL FIGURES
ALL FILES | 51.15
| -0.18
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Heathrow
ALL FIGURES
ALL FILES | 51.48
| -0.45
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Hemsby
ALL FIGURES
ALL FILES | 52.68
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| Herstmonceux | 50.94 | 0.19 | * | * | * | * | * | * | * | * | * | * | * | * | * |
Paisley
ALL FIGURES
ALL FILES | 55.86
| -4.43
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Ringway
ALL FIGURES
ALL FILES | 53.35
| -2.28
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Yeovilton
ALL FIGURES
ALL FILES | 51.00
| -2.63
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* The observed data require further processing and re-formatting before weather generator output can be produced for Herstmonceaux. The nearest available site is Gatwick.
The percentile threshold values calculated from observed data which were used to calculate these extremes are available
here (Excel spreadsheet).
Any questions about these data should be addressed to Clare Goodess.
Last updated: March 2005, Mike Salmon
