Station: Yangon, Myanmar'Am Elevation: 23 m(76 ft) Lat/ong:16°47N96°10E Population: 2, 458, 700 Avg.Ann.Temp:273°c(81.1°F)Ann.Temp.Rang Ann. Preci 55C°(99F 2527cm(99.5i.) Formerly Ran INDIAN OCEAN 。 oo KILOMETERS (30)g F MA N D Month
Station: Merida, Mexico Aw Elevation: 22 m(72.2 ft) Lat/long:20°59N89°39W Population: 400, 000 Avg. Ann. Temp. 26C(78.8.F)Ann. Temp. Range: 5C(9 F) Total Ann Precip. Ann. Hr of sunshine: 2379 8 5" 0 600 KILOMETERS 20 F MAMJJ A SON D Month
B.千早和半千早气候带 (1)气候指标 年蒸发量>年降水量 气温无限制 (2)分型 气候指标:千早程度 BS草原气候型:降水量>蒸发量的一半 BW沙漠气候型:降水量<〈蒸发量的一半
B．干旱和半干旱气候带 ．干旱和半干旱气候带 （1）气候指标 • 年蒸发量>年降水量 • 气温无限制 （2）分型 • 气候指标：干旱程度 气候指标：干旱程度 • BS草原气候型：降水量 草原气候型：降水量>蒸发量的一半。 蒸发量的一半。 • BW沙漠气候型：降水量 沙漠气候型：降水量<蒸发量的一半。 蒸发量的一半
不同雨型区界限的确定 冬雨区年雨区 夏雨区 BS r<2Tr<2(7+7)r<2(7+14) 气候型 BW r<T r<T+7 r<T+14 气候型
冬雨区 年雨区 夏雨区 BS 气候型 r < 2T r < 2（T+7） r < 2（T+14） BW 气候型 r < T r < T+7 r < T+14 z 不同雨型区界限的确定 不同雨型区界限的确定
(3)副型气候指标 ●h:年平均气温〉18℃,低纬、干热; ●k:年平均气温<18℃,中纬、干凉。 Dry Arid and Semiarid Climates(B) The dry arid and semiarid B climates are the only ones that Koppen classifed by precipitation rather than temperature. Dry climates are the worlds arid deserts and semiarid regions, mey, Kazak with their unique plants, animals, and physical features. They occupy more than 35% of Earth's land area and clearly the Albuquerque, NM most extensive climate over land. The mountains, rock strata long vistas, and the resilient struggle for life are all magnified by the dryness. Sparse vegetation leaves the landscape bare POTET demand exceeds PRECIP supply throughout dry arid and semiarid B climates, creating permanent water deficits, the Australia extent of which distinguishes desert and steppe climatic regions. (Specific annual and daily desert temperature regimes, including the highest record temperatures, are Hot, dry arid desert Hot, semiarid steppe discussed in Chapter 5; surface energy budgets are covered in Cold, dry arid deserts Cold, semiarid steppe Chapter 4; desert landscapes in Chapter 15; and desert environments in Chapter 20
（ 3）副型气候指标 ）副型气候指标 z h:年平均气温>18 ℃ ,低纬、干热； z k:年平均气温<18 ℃ ,中纬、干凉