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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
36
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 3, all of the following are true of autumn storms EXCEPT ________.
选项
A、they involve rain combined with tropical windstorms.
B、cyclonic storms have a predictable pattern of travel.
C、their movement creates a weather cycle that repeats itself.
D、they begin as northern Siberian air masses with consistent rains following the summer heat.
答案
D
解析
本题属于否定事实信息题,要求根据第3段选出与秋天的暴风雨说法不符的一项。原文第3段第1句提到,夏季高温过后就是难以预测的秋雨,也就是说秋天的暴风雨不是在西伯利亚北部的空气团带来持续降雨之时开始的,而是在夏季高温过后就开始了,故D项错误。A项“它们伴随着热带风暴和降水”对应第3段第1句。B项“气旋风暴具有可预测的行进模式”是对第3段的整合。C项“它的行进活动创造了一个周而复始的天气周期”对应第3段最后1句。
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