Archive for the ‘Surfacestation’ Category

Surfacestations news

Posted: July 29, 2014 by tchannon in Surfacestation

This is a brief post pointing at my own low traffic blog where I am asking for assistance with finding a few Met Office sites. Not a pretty post, will bore ordinary readers but if you are tech, maybe.

On the other hand there is a huge list of Bing and Google links to aerial images. (150+)
Example, where is Sheffield CDL not a full site, temperature and humidity, that is the location given. :-)
[update]  shep has found it, see comments ]

http://daedalearth.wordpress.com/2014/07/29/met-office-station-location-assistance/

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Guest post from Roger Andrews, who says: ” This is a review that extends Euan Mearns’ article on sunshine hours, cloud cover and SAT in the UK over mainland Europe and the North Atlantic. It reveals some interesting features that I make no attempt to explain – basically because I can’t – but someone else may have some ideas.” Apologies to Roger A for the delay in getting this article posted.

SUNSHINE, CLOUD COVER AND SURFACE AIR TEMPERATURES IN EUROPE
by Roger Andrews

The recent “UK temperatures since 1933” post discussed the relationships between sunshine hours, which were assumed to be an inverse cloud cover proxy, on surface air temperatures (hereafter SAT) at 23 UK stations. Here I summarize the relationships between sunshine hours, cloud cover and SAT over  Europe using observations from ~30 stations selected from the European Climate Assessment (ECA) data set (acknowledgement as requested to Klein Tank, A.M.G. and Coauthors, 2002. Daily dataset of 20th-century surface air temperature and precipitation series for the European Climate Assessment. Int. J. of Climatol., 22, 1441-1453.) Station locations are shown in Figure 1:

image1

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This is a guest post by Jerry Lundry

Two plots are presented for annual average temperature in the United States Historical Climate Network (USHCN). This data set is highly regarded by some in climate science and is sometimes used as a surrogate for world-wide temperatures. Among its attributes are its coverage of a large land mass (the forty-eight contiguous United States), dense coverage of that land mass (1218 stations), and records that are complete to 1912 and missing only about eighty stations back to 1895. Temperatures for all stations are also provided for 1908.

In 2012, the author downloaded and produced annual average temperatures for this data set. The first figure below provides average annual temperatures for 1908 and 1912-2011. The curve faired through the data is a standard Excel sixth-order polynomial. This curve shows minima in years 1914 and 1970, and maxima in years 1940 and 2004, give or take a year or two.

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Figure 1

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ANYONE LOOKING FOR THE EU SEED LAW PETITION CAN FIND IT HERE

I haven’t time to edit this properly, so I hope Roger Andrews will forgive me for just pasting his email into this guest post and lobbing in the images. Somewhere in the archives there’s a post From RA in which he used my cumulative solar technique to get some good fits too. I’ll link it  if anyone finds it. You’ve all seen data before, and know what to do…

Here are the results of the empirical models I ran five or so year ago, plotted on the three sets of figures linked to below and accompanied by a writeup, sort of.  The first set of figures allows for both anthropogenic and natural forcings. Results are presented for the 60-90N, 30-60N, 0-30N, 0-30S and 30-60S latitude bands and for the area-weighted global average of these bands. (There weren’t enough data to put together a comparison for 60-90S.)

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Image courtesy Microsoft and providers, please strictly non-commercial.

Bing image location 50.7795 -1.83622

Highest reported temperature was at Hurn (Bournemouth Airport) a known poor synoptic Met Office site, although it could be worse. There is a bit of a mystery.

24 hours ending 2200 on 14 Jul 2013:
UK Highest max 0900-2100 31.0 °C Hurn
Lowest max 0900-2100 12.9 °C Lerwick
Lowest min 2100-0900 3.6 °C Katesbridge
Highest rainfall 2100-2100 4.8 mm Cassley
Sunniest 2100-2100 14.3 hours Morecambe
Last updated: 0001 on Mon 15 Jul 2013

The Met Office hourly data for Hurn peaks at 29.0C, so there is a brief peak for some reason. Looking at other data 29 or so would be fair enough. How did 2C materialise?

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The dear Met Office have been pushing over the past few days about HOTTEST EVER THIS YEAR. Face it Met Office, enjoying life does not involve screaming or fear unless you are a kid.

Current 2013 UK maximum temperature confirmed

The current 2013 UK maximum temperature was recorded on Saturday 13 July, with 31.4 C at Heathrow. Wales also saw its highest 2013 temperature with 30.2 C at Llysdinam. The previous maximum of 29.9 C from Monday 8 July, at Edenfel, remains the current highest for Northern Ireland. Scotland saw its highest 2013 temperature on Tuesday 9 July, with 28.7 C at Strathallen Airfield. Issued at 2319 on Sat 13 Jul 2013.

Heathrow like most temperature breakers is a defective site. How about fixing it?

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Chilbolton: data update, 107 days

Posted: June 1, 2013 by tchannon in Dataset, Surfacestation

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This post is is primarily for a data release, 107 days, 16th Feb 2013 through 31st May 2012 less one day. (I was indisposed)

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Figure 1

Since mid February 2013 I have been capturing high time resolution data from the Chilbolton Observatory web site, done for the previous day. This is processed from .PNG files into numeric data here. [1]

Data exists for about 23 hours a day at a few minutes between samples, data currently amounts to about 56,000 readings.

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Sometimes the sun shines through, reflects off and other optical effects of cloud. This does lead to insolation well in excess of the maximum for the time of year. An instance is shown above complete with an hourly sky thumbnail which almost caught one at the time, the effect comes and goes very quickly.

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Surfacestation Fyvie Castle

Posted: May 6, 2013 by tchannon in Analysis, Surfacestation

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Fyvie Castle, Aberdeenshire, Scotland. A National Trust property, web site entry

57.442805° -2.389692° Google browser map
Altitude 55 metres

AWS since 1994, manual data record from 1959

Estimated Class 4, fails Class 3 on ground cover within 10 metres. (to WMO 1046, 2010)

UHI, microclimate, in a garden. Distance, none.

I need to add I have a close lat/long but no cross reference images or other information so I might have incorrectly located the Stevenson screen.

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What follows shows nothing new but is food for thought given the matter of pyrgeometers on the Talkshop.

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Figure 1

1st May was a particularly sunny day in southern England but cool, with a continuing wind from Norway via the North Sea.

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Surfacestation Killowen

Posted: April 28, 2013 by tchannon in Analysis, Surfacestation

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Red line and arrow, line of sight for Google Streetview, see below.

Killowen, County Down, Northern Ireland, Killowen Outdoor Centre, Carlingford Lough.

Data from 1997, as AWS from about 2000, older data somewhere near from 1961
24 hours ending 2200 on 27 Apr 2013:
UK Highest max 0900-2100 12.9 °C Killowen

54.076877° -6.184006° Bing maps, Google maps

Altitude 4 metres

Estimated Class 4, fails Class 3 on > 10% “Ground covered with natural and low vegetation (<25 cm) representative of the region;” and “at more than 10 m from artificial heat sources and reflective surfaces (buildings, concrete surfaces, car parks, etc.)” with 10 metres. (hedge / wall)

UHI, local, isolated marina, heated public centre, vehicle parking, signs of outfall close to lough edge. Distance, none.

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Surfacestation Writtle

Posted: April 27, 2013 by tchannon in Analysis, Surfacestation

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Writtle, Essex. (at Writtle college, just west of Chelmsford)
Records marked from 1940 but the location then not known.
Recent conversion to full AWS 2009.

51.733441° 0.429085°

Altitude 32 metres

Estimated Class 4, fails Class 3 on “Ground covered with natural and low vegetation (<25 cm) representative of the region;” within 10 metres. As a secondary station this seems hard but a ploughed field some of the year is inconsistent.

UHI moderate, housing to south and south west, agricultural college with glasshouses to north, edge of large town of Chelmsford 1.2km, centre 2.7km to the east.

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Surfacestation Altnahinch Filters

Posted: April 27, 2013 by tchannon in Analysis, Surfacestation

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Altnahinch Filters, County Antrim, Northern Ireland

55.047836° -6.255353° Google browser map

Altitude 213 metres.

Estimated Class 4, fails Class 3 on road and sewage tank within 10 metres. Suspect shadow from trees and hill to south west as well. (see Google Streetview below)

UHI, perhaps local sewage works, otherwise none.

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Pyrgeometers untangled

Posted: April 26, 2013 by tchannon in Measurement, methodology, Surfacestation

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This drawing shows the basic internals of a simple passive pyrgeometer.

Heat flows from roughly earth ground temperature into the body, finds it’s way through the body to the underside of the thermoelectric generator, then through that and for a clear sky then radiates from the top side to space, unless there are heavy clouds or it is raining.

I repeat, heat flow is from the ground upwards. (under very rare meteorological conditions a minor reverse flow happens, the former is overwhelmingly dominant)

This is far from the whole convoluted story, which I will now try and explain. In reality it is very simple.

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Surfacestation: Myerscough

Posted: April 22, 2013 by tchannon in Analysis, Surfacestation

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Image dated 2002. Various web sites show the site remains similar. New bedding 2005 and various other detail change. Brochures include site drawing showing a rectangle which is the met. enclosure.
Twice hottest place in UK April 2013 (that I noticed, don’t check every day)

Myerscough, Lancashire,
Myerscough College, Garden Centre and Arboretum
http://www.myerscough.ac.uk

53.8538 -2.7668 Bing maps, Google maps
Altitude 14 metres

Estimated Class 4, fails Class 3 on “Away from all projected shade when the Sun is higher than 7°”, trees to south-west and west. Poor exposure.
I suspect it ought to be Class 5 but estimating shadow without more certain detail is impossible.
It is a microclimate.

UHI, local, distance, minor.

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Courtesy Physikalisch-Meteorologisches Observatorium Davos
Radiation instrument with cover removed

Since I have just made available numeric data which will add meat to talk about pyrgeometers and how heat behaves and travels in the atmosphere, a continuation of a long Talkshop thread can take place here. If you want to comment on what the Chilbolton data means, then this is the thread.

Original thread is here.

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Example data. Lidar is useful in identifying cloud layers, clear sky, it cannot though see multiple layers, where radar images if available are more useful. Click to open full size.

[UPDATE 2013/05/05,  archive release with corrections] An unofficial high resolution dataset has been derived from web published graphs running from 16th February 2013 to 20th April 2013 (less 23rd Feb), just over 60 days of data at about 2.3 minutes resolution for about 23 hours a day. The data includes atmospheric water parameters and thermal radiation parameters, all measured from surface level. Archive period includes the exceptionally cold March 2013. The weather hereabouts was cold but unlike most of the rest of the UK there was little snow, nor was the temperature very low. (more…)

Surfacestation: Porthmadog

Posted: April 10, 2013 by tchannon in Analysis, Surfacestation

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Porthmadog, Gwynedd, Wales (actually at Morfa Bychan)

Near Harlech, Portmerion, Criccieth. Of interest is nearby http://www.nda.gov.uk/sites/trawsfynydd/ a lake cooled nuclear power station which is being decommissioned. (14km north east)

52.914519° -4.158090° Bing maps, Google maps
Altitude 7 metres

Estimated Class 3, fails Class 2 on 11% trees within 30 metres, possibly Class 4 due to poor ground cover and additional scrub.

UHI, Coastal, minor local housing, distance, none.

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Surfacestation: Monks Wood

Posted: April 10, 2013 by tchannon in Analysis, Surfacestation

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Monks Wood, Cambridgeshire
At Centre for Ecology & Hydrology
CEH Monks Wood

Met Office substitute site for RAF/USAF Alconbury
Bunkers site has some useful images.

52.401526° -0.236991°
Altitude 41 metres
Bing maps, Google maps.

Class 3, fails Class 2 on 12.9% within 30 metres not covered by low vegetation typical of the region, to wit, hedges. (part explanation for blog newcomers, to WMO-No. 1064, 2010, Met Office were present and are members of WMO but seem to continue using their own far less stringent standard, where scale is inverted, higher number is better, scale drawing and measurement is done using Draftsight over an image)

UHI, none but site has poor exposure. Within a wood.

Site came to my attention as recording the lowest night temperature -2.3C for East of England 8th April 2013. Not a serious matter.

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