24小时热门版块排行榜

>论坛更新日志 (3950)
>虫友互识 (703)
>文献求助 (231)
>休闲灌水 (223)
>导师招生 (218)
>考博 (138)
>论文投稿 (135)
>博后之家 (93)
>硕博家园 (90)
>招聘信息布告栏 (72)
>论文道贺祈福 (70)
>基金申请 (61)
>教师之家 (50)
>考研 (49)
>找工作 (46)
>公派出国 (24)

返回列表

当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

mayingjiu

木虫 (正式写手)

ESEPI: 1
应助: 3 (幼儿园)
金币: 5280.7
红花: 1
帖子: 399
在线: 87.8小时
虫号: 930627
注册: 2009-12-19
专业: 光学

[交流] 【Share】Study shines new light on Sun's role in Earth's climate

By Matthew Knight for CNNOctober 7, 2010 -- Updated 1822 GMT (0222 HKT)

New research published by UK and U.S. scientists challenges current ideas about the sun's influence on Earth's temperatures.

London, England (CNN) -- A new study has shed light on the sun's impact on the Earth's climate, confounding current thinking about solar cycles and how they influence temperatures on Earth.

Previously scientists had thought that radiation reaching the Earth rises and falls in line with the Sun's activity, which during the 11-year solar cycle goes though periods of low and high activity.

But research by Imperial College, London and the University of Colorado in the U.S. examining solar radiation levels from 2004 to 2007 -- a period of declining solar activity -- revealed that levels of visible radiation reaching the Earth actually increased during the period.

Using data collected by NASA's SORCE (SOlar Radiation and Climate Experiment) satellite, which launched in 2003, the scientists were able to scrutinize the full solar spectrum -- x-ray, ultraviolet (UV), visible (VR), near-infrared, and total solar radiation -- and compare it to earlier, less comprehensive data.

Joanna Haigh, leader author of the study published in the journal Nature told CNN: "What the data has shown, rather unexpectedly, is that the decline in ultra-violet radiation is much larger than anticipated. But more surprisingly the visible radiation actually increased as solar activity was declining."

回复此楼