Page 181 - Handbook of Gold Exploration and Evaluation

Table 3.5 Classification of world climate (after Barlow and Newton, 1974)
Group Strahler's name Koppen's Descriptive name Causal factors
symbol

Group I 1. Equatorial rain forest Af Equatorial hot-wet Convergence of moist air
Low latitude 10ë N to 10ë S masses along zone of I.T.C.
climates controlled 2. Trade wind littoral Af Tropical eastern Seasonal occurrence of
by equatorial and 10ë to 25ë N and S (seasonal) maritime moist Tm air masses
tropical air masses 3. Tropical desert and steepe B Tropical deserts Subtropical highs and all-year
15ë to 35ë N and S climates presence of dry Tc air masses
4. West coast desert B Tropical deserts Stable subdising Tm air masses.
15ë to 30ë N and S climates Cold currents
5. Tropical savanna and Aw Tropical wet-dry and Moist Tm in summer. Dry Tc in winter.
tropical monsoon Am tropical monsoon Moist Tm in summer

Group II 6. Humid sub-tropical Cfa Warm temperate Moist Tm, frequent invasions of
Mid-latitude climates 25ë to 35ë N and S eastern maritime Pc air in winter
controlled both by 7. Marine west coast Cfb Cool temperate Moist Pm all year, frequent
tropical and polar 40ë to 60ë N and S western maritime cyclonic storms
air masses 8. Mediterranean Csa Warm temperate Pm in winter ± wet
30ë to 40ë N and S western maritime Tc in summer ± dry
9. Humid continental B and D These climates grade from moist Df coastal types
35ë to 60ë N climates (Strahler's `Humid continental') to arid desert and
10. Mid-latitude desert and steppe B steppe climates of continental interiors (Strahler's
35ë to 50ë N and S claimates `Mid-latitude desert and steppe').
Group III 11. Subarctic climates D climates Cold continental Controlled by Pc air.
High latitude 55ë to 70ë N Dfc Precipitation from frequent invasions
climates controlled Dfd of more moist Pm air
by polar and arctic 12. Tundra north of 55ë N and E Cold coastal Moderating influence of oceans.
air masses south of 50ë S climates Frequent storms along fronts between
Pm and Pc and arctic air masses
13. Icecap climates of E Perpetually frozen Cold and dry arctic and antarctic
Greenland and Antarctica climates continental icesheets air masses