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  • The objective is to provide students with a broad knowledge and understanding of the world's major climates as shown below.
 
 
  • However, detailed reference needs to be made to only one climatic type from either a tropical or a temperate region. (We are studying the Tropical Continental (Savanna) climate in detail.)
 
 
  • Describe and compare the distribution of global climates using an atlas e.g. WJEC Atlas

 
  Student Voice: Click on Pic  
 

 
     
  Koppen Climate Classification:  
 

 
  Source: Wikipedia  
  Koppen classified climate with respect to two main criteria, temperature and seasonality of rainfall, Indeed, five of his six climatic types are based on mean monthly temperatures.

A - Tropical rainy climate - coldest month above 18*C
B - Dry (desert)
C
- Warm temperate rainy climate - coolest month -3*C to 18*C; warmest month above 10*C
D
- Cold boreal forest climate - coldest month -3*C or less; warmest month 10*C or more.
E
- Tundra - warmest month 0 - 10*C
F
- Perpetual frozen climate - warmest month less than 0*C.

The choice of specific figures is as follows: 18*C is the critical winter temperature for tropical forests. 10*C is the poleward limit of forest growth. -3*C is generally associated with two or three weeks of snow annually. The climate classification is very much based on vegetation distributions - a world map of vegetation biomes and a world map of climatic regions would show very similar distribution patterns.

There are sub-divisions which are based on rainfall:

f - no dry season
m - monsoonal (i.e. short dry season and heavy rains in rest of year)
s - summer dry season
w - winter dry season

For category B (deserts):

h - mean annual temperature greater than 18*C
k - mean annual temperature less than 18*C but warmest month above 18*C
k' - mean annual temperature less than 18*C and warmest month below 18*C

 
     
  Hypothetical continent showing distribution of Koppen's climatic regions.  
 

 
  Source: Guinness & Nagle  
  Why is the continent assumed to be of low and uniform elevation?
What does region Af mean?
Where is region Af located on the continent? Why is it there?
What does region Bw mean?
Where is region Bw located on the continent? Why is it there?
What does region Aw mean?
Where is region Aw located on the continent? Why is it there?
 
     
  Fortunately, the examiner has simplified matters for us and specified a narrower range of climatic types for us to have a broad understanding of...  
  and also specified that we need detailed knowledge of only one climatic  type.  
     
  Simplified World Climate Distribution  
 

 
  Source: http://www.geography.learnontheinternet.co.uk/topics/climatezones.html#factor  
     
 
The classification is based on maximum and minimum temperatures and the temperature range as well as the total and seasonal distribution of precipitation.

Simple summary of climatic zones:

Polar - very cold and dry all year
Temperate - cold winters and mild summers
Arid - dry, hot all year
Tropical - hot and wet all year
Mediterranean - mild winters, dry hot summers
Mountains (tundra) very cold all year

 
     
  The examiner drew this model of the distribution of topical and temperate climates across an imaginary (flat) continent to help you:  
     
  Tropics and Temperate Latitudinal Belts - Distribution of Main Climate Types  
 

 
     
  Suggest a Climatic Region for each set of data below:  
  Draw a table like that below: (You'll need 9 rows - one for each set of climate figures.
Climatic Region
(Code Letter and name)
Description of Key Climatic Features Explanation of Key Climatic Features
 

 

   
 
     
  GeogOnline decided to colour some figures to try and highlight patterns in the data-
Temperature monthly mean over 25*C 
Temperature monthly mean below 0*C
Total annual rainfall over 2000mm
Monthly rainfall total over 200mm
Total annual rainfall below 500mm
Monthly rainfall total below 40mm

 
 
     
 

W - Elevation: 8 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  25  26  27  29  32  37  37  37  34  29  26  26  30
Precip. mm  8  2  5  12  8  1  1  2  1  2  5  5  52

 

 
  Why are all the monthly temperature figures red?
What is the annual range of temperature?
Why are all the monthly rainfall totals and therefore also the annual total orange? (Rainfall distribution/seasonality)
How many seasons are there?
 
     
 

X -  Elevation: 65 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  27  27  28  28  27  27  27  27  27  27  27  27  27
Precip. mm  554  519  557  620  655  655  572  574  561  563  563  512  6905
 
 
  Why are all the temperature figures in red?
What is the annual range of temperature?
What do you notice about all the monthly totals of rainfall and therefore also the annual total? (Rainfall distribution/seasonality)
How many seasons are there?
 
     
 

Y - Elevation: 22 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  27  27  28  29  29  27  26  26  26  27  27  27  27
Precip. mm  5  2  9  40  233  982  1059  577  267  206  71  18  3467

 

 
  Why are all the temperature figures in red?
What is the annual range of temperature?
What do you notice about the annual rainfall total?
Is there a connection between rainfall and temperature? Why?
What do you notice about rainfall distribution and seasonality.
 
     
 

Z - Elevation: 27 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  28  28  28  28  27  25  25  26  28  29  29  29  28
Precip. mm  341  338  274  121  9  1  2  5  17  66  156  233  1563

 

 
  Why are all the temperature figures in red?
What is the annual range of temperature?
When do the temperatures fall? (Is this a northern hemisphere location?)
What season does rainfall occur in? How many seasons are there?
 
     
 

V - Elevation: 5 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  4  4  7  9  12  16  18  17  15  11  7  5  10
Precip. mm  54  40  37  38  46  46  56  59  50  57  64  48  595

 

 
  Why are all the temperature figures in black?
What is the annual range of temperature and what is the annual mean temperature? Is this an equable climate?
Describe the annual rainfall distribution.
Is this a northern hemisphere station?
 
     
 

U - Elevation: 240 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  -18  -16  -8  3  11  17  20  19  13  6  -5  -13  3
Precip. mm  26  21  27  30  50  81  69  70  55  37  29  22  517

 

 
  Why are 5 of the monthly temperature figures in blue?
What is the annual range of temperature and what is the annual mean temperature? Is this an extreme climate?
Describe the seasonality of the rainfall.
Suggest what might cause this rainfall distribution?
 
     
 

T - Elevation: 512 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  19  19  17  13  11  8  8  9  11  13  16  19  14
Precip. mm  3  3  5  13  64  84  76  56  30  13  8  5  360

 

 
  Why are all the temperature figures in black? When is its cooler season and what does this mean?
What is the annual range of temperature and what is the annual mean temperature? Is this an equable climate?
Describe the seasonality of the rainfall. When do the 8 months of relatively low rainfall occur and when do the 4 wetter months occur?
 
     
 

S - Elevation: 1 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  12  13  16  20  24  27  28  28  26  21  16  13  20
Precip. mm  98  101  136  116  111  113  171  136  128  72  85  104  1371

 

 
  Source: all above graphs Pidwirny http://www.physicalgeography.net/fundamentals/7v.html  
  Why are 4 of the temperature figures in red and when do they occur? What does this suggest about its latitude?
Is this an equable or an extreme climate? (Calculate the annual range to help your decision)
What do you notice about the rainfall distribution?
Suggest what sort of rainfall may occur in its warmest season?
 
     
 

R - Elevation: 27 m

 

   Jan.  Feb.  Mar.  Apr.  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Year
Temp. ° C  -6 -6   -1.7  3.6  9.4  15  18  18  14  9  3  -3  6
Precip. mm  147  119  127 124  110  98  96  109  94  129  154  167 1474

 

 
  Source: http://www.canadainfolink.ca/climate.htm  
  Why are 4 of the monthly temperature figures in blue?
Calculate annual range of temperature? What sort of climate dos this suggest - equable or extreme?
Compare the temperature pattern to Place V and to Place U.
Describe the rainfall distribution and comment on the rainfall total?
 
     
Key Datasheet