1257888920.txt

From: Phil Jones <p.jones@uea.ac.uk>
To: c.harpham@uea.ac.uk
Subject: FW: Helpdesk query 1489: Hourly data have discontinuities at day joins
Date: Tue Nov 10 16:35:20 2009

Colin,
I thought that this didn't happen.
Cheers
Phil

From: C G Kilsby <c.g.kilsby@newcastle.ac.uk>
To: "p.jones@uea.ac.uk" <p.jones@uea.ac.uk>
Date: Tue, 10 Nov 2009 15:35:37 +0000
Subject: FW: Helpdesk query 1489: Hourly data have discontinuities at day
joins
Thread-Topic: Helpdesk query 1489: Hourly data have discontinuities at day
joins
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Interesting one for you....

From: Lyndsey Middleton [[4]mailto:lyndsey.middleton@ukcip.org.uk]
Sent: 10 November 2009 2:43 PM
To: C G Kilsby
Subject: Helpdesk query 1489: Hourly data have discontinuities at day joins

Hi Chris,

Another Weather Generator query for you. It was raised by Richard Watkins of Manchester
University (and COPSE project) following a visit from Roger yesterday.

Can you let me know your response please?

Cheers,
Lyndsey

Long Description=The hourly data from the Weather

Generator have discontinuities at each

midnight join. The e.g. temperature

jumps, may be as high as 9�C. The

hourly data seem to have been generated

independently for each day, rather than

fitting a curve from the maximum of one

day to the minimum of the next. The

minimum to maximum curve, i.e. within

each day, is fine.

Could the Weather Generator be altered

to produce more realistic hourly data

by fitting from Tmax to Tmin the

following day, please? This would be

helpful particularly for any use of the

data for building simulation with plant

controls.

Thanks,

Richard Watkins

Lyndsey Middleton
Enquiries Officer

UK Climate Impacts Programme
School of Geography and Environment
OUCE
South Parks Road
Oxford OX1 3QY

[5]www.ukcip.org.uk

Tel: 01865 285 718 (direct) or 01865 285717 (switchboard)

My working days are: Tuesday and Wednesday 9am to 5pm and Friday 9 am to 12.30pm

Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) 1603 592090
School of Environmental Sciences Fax +44 (0) 1603 507784
University of East Anglia
Norwich Email p.jones@uea.ac.uk
NR4 7TJ
UK
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References

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4. mailto:lyndsey.middleton@ukcip.org.uk
5. http://www.ukcip.org.uk/