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An aridity index (AI) is a numerical indicator of the degree of dryness of the climate at a given location. The American Meteorological Society defined it in meteorology and climatology, as "the degree to which a climate lacks effective, life-promoting moisture".
De Martonne was also secretary of the Comité D'études, which worked on fixing boundary issues following the war, especially in Romania and the Balkans. [8] [10] He was familiar with Central Europe and Romania, as he had conducted studies in the Southern Carpathians earlier in his life. [8] After that, he taught at the University of Cluj in ...
A phase of intense aridity around 2200 BC is recorded across North Africa, [16] the Middle East, [17] the Red Sea, [18] the Arabian Peninsula, [19] the Indian subcontinent, [6] and midcontinental North America. [20] Glaciers throughout the mountain ranges of western Canada advanced around that time. [21] Iceland also experienced glacial advance ...
Desertification is a gradual process of increased soil aridity.Desertification has been defined in the text of the United Nations Convention to Combat Desertification (UNCCD) as "land degradation in arid, semi-arid and dry sub-humid regions resulting from various factors, including climatic variations and human activities."
Thornthwaite developed four indices: the Moisture Index (Im), the aridity and humidity indexes (Ia/Ih), the Thermal Efficiency Index (TE) and the Summer Concentration of Thermal Efficiency (SCTE). Each of the four climatic types can be described by an English alphabet letter and are arranged exactly by the order shown previously. [ 5 ]
The northern portion of the Arid Diagonal is a result of the blocking of the trade winds by the barrier formed by the Central Andes and the South Pacific High. [5] To the south in the westerlies, the rain shadow that the Southern Andes cast over eastern Patagonia similarly blocks moisture. [1]
Aridification is the process of a region becoming increasingly arid, or dry.It refers to long term change, [1] rather than seasonal variation. It is often measured as the reduction of average soil moisture content.
Rules are provided for combining the stress (table 3) and humidity groups (table 2) to check a box classifying the humidity and aridity for each month. For each of six possible indicators, the number of months where that indicator was checked are added up, giving a yearly total. Schematic Design Recommendations. The yearly totals in table 4 ...