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THE CLIMATE OF JAPAN (1) At the most general level, two major climatic forces determine Japan’s weather. Prevailing westerly
THE CLIMATE OF JAPAN (1) At the most general level, two major climatic forces determine Japan’s weather. Prevailing westerly
admin
2022-09-29
40
问题
THE CLIMATE OF JAPAN
(1) At the most general level, two major climatic forces determine Japan’s weather. Prevailing westerly winds move across Eurasia, sweep over the Japanese islands, and continue eastward across the Pacific Ocean. In addition, great, cyclonic airflow (masses of rapidly circulating air) that arises over the western equatorial Pacific moves in a wheel-like fashion northeastward across Japan and nearby regions. During winter months heavy masses of cold air from Siberia dominate the weather around Japan. Persistent cold winds skim across the Sea of Japan from the northwest, picking up moisture that then deposits as several feet of snow on the western side of the mountain ranges on Honshu Island. As the cold air drops its moisture, it flows over high ridges and down eastern slopes to bring cold, relatively dry weather to valleys and coastal plains and cities.
(2) In spring the Siberian air mass warms and loses density,
enabling
atmospheric currents over the Pacific to steer warmer air into northeast Asia. This warm, moisture-laden air covers most of southern Japan during June and July. The resulting late spring rains then give way to a drier summer that is sufficiently hot and muggy, despite the island chain’s northerly latitude, to allow widespread rice cultivation.
(3) Summer heat is followed by the highly unpredictable autumn rains that accompany the violent tropical windstorms known as typhoons. These cyclonic storms originate over the western Pacific and travel in great clockwise arcs, initially heading west toward the Philippines and southern China, curving northward later in the season. Cold weather drives these storms eastward across Japan through early autumn, revitalizing the Siberian air mass and ushering in a new annual weather cycle.
(4) This yearly cycle has played a key role in shaping Japanese civilization. [A] It has assured the islands ample precipitation, ranging irregularly from more than 200 centimeters annually in parts of the southwest to about 100 in the northeast and averaging 180 for the country as a whole. [B] The moisture enables the islands to support uncommonly lush forest cover, but the combination of precipitous slopes and heavy rainfall also give the islands one of the world’s highest rates of natural erosion, intensified by both human activities and the natural shocks of earthquakes and volcanism. [C] These factors have given Japan its wealth of sedimentary basins, but they have also made mountainsides extremely susceptible to erosion and landslides and hence generally unsuitable for agricultural manipulation. [D]
(5) The island chain’s mountains backbone and great length from north to south produce climatic diversity that has contributed to regional differences. Generally sunny winters along the Pacific seaboard have made habitation there relatively pleasant. Along the Sea of Japan, on the other hand, cold, snowy winters have discouraged settlement. Furthermore, although annual precipitation is high in that region, much of it comes as snow and rushes to the sea as spring runoff, leaving little moisture for farming.
(6) Summer weather patterns in northern Honshu, and especially along the Sea of Japan, have also discouraged agriculture. The area is subject to the Yamase effect, when cool air from the north sometimes lowers temperatures sharply and damages farm production. The impact of this effect has been especially great on rice cultivation because, if it is to grow well, the rice grown in Japan requires a mean summer temperature of 20 degree centigrade or higher. A drop of 2 to 3 degree centigrade can lead to a 30—50 percent drop in rice yield, and the Yamase effect is capable of exceeding that level. This Yamase effect does not, however, extend very far south, where most precipitation comes in the form of rain and the bulk of it in spring, summer, and fall, when most useful for cultivation. Even the autumn typhoons, which deposit most of their moisture along the southern seaboard, are beneficial because they promote the start of the winter crops that for centuries have been grown in southern Japan.
(7) In short, for the past two millennia, the climate in general and patterns of precipitation in particular have encouraged the Japanese to cluster their settlements along the southern coast, most densely along the sheltered Inland Sea, moving into the northeast.
The limits that topography imposed on production have been tightened by climate, with the result that agricultural output has been more modest and less reliable, making the risk of crop failure and hardship commensurately greater.
According to paragraph 5, which of the following is a major factor in the limited habitation in the area along the Sea of Japan?
选项
A、It has too many mountains.
B、It is vulnerable to floods during spring runoff.
C、Its climate is highly irregular and unpredictable.
D、It is cold and snowy during winter.
答案
D
解析
本题属于事实信息题,问根据第5段,哪项是日本海沿岸居住地有限的主要原因。第5段第3句提到,日本海沿岸的冬天寒冷、多雪,不适合人们定居。D项“冬季寒冷、多雪”与原文内容相符。A项“多山”、B项“春季径流期间易受洪水侵袭”和C项“其气候极其不规律且不可预测”均未在原文第5段被提及,故排除。
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