Text definition: polar

[GoogleCodeExporter]

Suggested enhancement (e.g. improved definition, new synonyms, etc.):
Text definition for 'polar' subclass of environmental condition:
"A polar condition is an environmental condition characterized by extremely 
cold temperatures (quantified by average temperatures of 10 °C or above for 0 
to 3 months per year following the Köppen climate classification system), 
heavy glaciation wherever there is sufficient precipitation to form permanent 
ice, and extreme seasonal variations in daylight hours."

Definition annotations: database cross-references:
Wikipedia:Polar_climate
Wikipedia:Köppen_climate_classification

Rationale:
Currently there is no definition for polar other than being a subclass of 
environmental condition. Some definition should be provided; this or something 
similar would be appropriate to explain how polar is different from other 
environmental conditions. (Though a logical definition would be best, a text 
definition would be a first step).

Relevant sources (e.g. provenance of synonyms):
Wikipedia - Köppen climate classification and polar climate. 

Original issue reported on code.google.com by ealarsen...@gmail.com on 5 Aug 2013 at 2:18

[GoogleCodeExporter]

Thanks for the suggestion!
For conditions like polar, temperate, and tropical, I feel that the light input 
is probably going to be the key differntia. Other factors, like temperature, 
may vary due to more local factors.

Please stick to the "A =def. a B which Cs" format if possible, where A is a 
subclass of B and C is the differntia. Also, try to avoid phrases like 
"characterized by" as these can lead to ambiguity.

Further, can a condition be characterised by heavy glaciation? I suppose that 
refers more to polar environments themselves rather than a polar condition. 

Original comment by p.buttig...@gmail.com on 5 Aug 2013 at 3:11

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