Weather: space & time differences Prof. Grant Bigg, Head, Department of Geography, University of...
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Transcript of Weather: space & time differences Prof. Grant Bigg, Head, Department of Geography, University of...
![Page 1: Weather: space & time differences Prof. Grant Bigg, Head, Department of Geography, University of Sheffield.](https://reader036.fdocuments.net/reader036/viewer/2022062516/56649daa5503460f94a98dd3/html5/thumbnails/1.jpg)
Weather: space & time differences
Prof. Grant Bigg, Head, Department of Geography, University of Sheffield
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The Climate System
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The Climate System
(Naturally varying)
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The Climate System
(directly anthropogenically varying)
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Differences (or variability) over different timescales
• Millennial
• Centennial
• Decadal
• Interannual
• Seasonal
• Daily
• Hourly
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Millennial cycling
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Centennial change
Fig. 6.10 IPCC (2007)
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Decadal change
Global surface air temperature(IPCC Fig. 3.6)
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Interannual change
Central England Temperature
(from www.metoffice.gov.uk/hadobs)
oC
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Seasonal change
Central England Temperature 2009-2011
(from www.metoffice.gov.uk/hadobs)
oC
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Daily change
Central England Temperature 2012
(from www.metoffice.gov.uk/hadobs)
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Hourly change
Google Earth.lnk
Let’s look at Google Earth’s weather overlays for hourly variation
Then go to spatial scales
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• Stop slide show
• Go to Google Earth (pre-set to Weather & Terrain only)
• Expand weather layer
• Comment on cloud patterns observed over eastern Atlantic
• Click cloud animation in Temporary Places
• Turn off weather layer
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• Drag play pointer slowly along describing time evolution and introducing spatial scales
• Go to yesterday evening and zoom to UK or some other region where overnight variation
• Point to reduced scale and zoom in to area
• Move through sequence commenting on what it reveals about space and time scales
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• Go over UK if not there
• Turn on weather layer
• Draw attention to weather data and temperature
• Zoom in to bring more stations
• Click on station – note features (and that probably from analysis, not real data)
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• Click on hourly and details to give hour by hour step
• Note forecast only, from US Weather Channel
• Remove and note spatial limitations of this detailed data to major towns
• Now switch to radar data and move to clear rainfall zone
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• Note 3 hour 30 minute delay between radar and cloud (radar ahead) – hence mismatch in patterns
• Activate radar animation
• Follow through, discussing spatial and temporal scales
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Sources of data or ideas
• Royal Meteorological Society MetLink site (www.metlink.org)
• Meteorological Office Weather Observations Website (wow.metoffice.gov.uk/home)
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Suggestions For Weather Space- Time Differences Questions That Can Be Explored With Student Observations
• Variation over time at home (hourly, daily or longer)
• Variation over school catchment at same time (synoptic view)
• For those with solar panels – how does power generation relate to cloudiness?
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Any Questions?