THE ROLE OF WEST PACIFIC MARGINAL SEAS IN GLACIAL ARIDIFICATION OF CHINA:A PRELIMINARY STUDY
-
摘要: 亚洲东部在冰期最为壮观的地理变化是边缘海大片浅海陆架的出露成陆。仅从我国到澳大利亚以北的三大浅海区，盛冰期成陆的面积便可达3.9×106km2.边缘海中的半封闭海，在冰期时发生海流改组，可以导致表层水温下降的异常。海区面积的减小和海水温度的下降，均导致蒸发量的降低。仅南海的估计，盛冰期水汽供应量便可减少800-1400×109m3/a,约相当现代我国年降水总量的1/8-1/4,是我国陆地冰期气候干旱化的重大因素。Abstract: The most conspicuous geographic change in East Asia at the glaciation was the.emergence of vast shelf areas of the West Pacific marginal seas, giving rise to remarkable alteration in sea configurations and to reduction in sea area. Only the three major shelves between north China and north Australia (East China Sea Shelf, Sum da Shelf, and Sahul Shelf) amount to 3 900 000km2, comparable in size to the indian Subcontinent. As the evaporation from sea is much higher than from land (the world average difference being 33.8cm/a or 50cm/a according to various estimations). the increase of the land area at the expense of the sea must have caused a reduction. of total annual evaporation from the 3 shelves by 1 318 or 1 950 milliard m3 of water.
-
-
计量
- 文章访问数:
- PDF下载数:
- 施引文献: 0
下载: