The frequency of major hurricanes over the Atlantic Ocean has increased significantly since 1995, but it is still not clear whether this is due to global warming or natural variability. One way to address this question is to consider changes in hurricane frequency in the past, but reliable observations of Atlantic hurricane activity only cover a few decades. Nyberg et al. use proxy records from corals and a marine sediment core that appear to reflect changes in the two main parameters that influence hurricane activity — vertical wind shear and sea surface temperature — to reconstruct the frequency of major hurricanes over the Atlantic since 1730. The results indicate that the frequency was anomalously low during the 1970s and 1980s compared with the past 270 years, and that the phase of increased hurricane frequency since 1995 represents a recovery to 'normal' hurricane activity. These trends appear to be related to wind shear, but what caused this parameter to change remains uncertain. 这个和考试时候的不太一样~但是说的完全是同一个飓风。是很好的背景材料~~~绿色部分是考试时候见过的一些信息~~~这里的two main parameters that influence hurricanes的和考试中说的因素差不多wind shear和ocean temperature,不过这里好像没有啥考点^ ^
-- by 会员 BBBinko (2012/10/13 23:46:49)
哈哈~~好的,谢谢喽,我是这个月帮木寻云童鞋一起考古的,考古没考到结果去Nature上搜到这个,其实一共有3篇,但是原文很长,估计GMAC是在里面节选改编了,祝LZ接下来一切顺利哈!! |