Variations in global cloud cover and the fair-weather vertical electric field

被引：34

作者：

Kniveton, D. R. ^{[1
]}

Tinsley, B. A. ^{[2
]}

Burns, G. B. ^{[3
]}

Bering, E. A. ^{[4
]}

Troshichev, O. A. ^{[5
]}

机构：

[1] Univ Sussex, Dept Geog, Brighton BN1 9QJ, E Sussex, England

[2] Univ Texas Dallas, Ctr Space Sci, Richardson, TX 75080 USA

[3] Australian Antarctic Div, Kingston, Tas 7050, Australia

[4] Univ Houston, Dept Phys, Houston, TX 77204 USA

[5] Arctic & Antarctic Res Inst, St Petersburg 199226, Russia

来源：

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | 2008年 / 70卷 / 13期

关键词：

Cloud cover; Global atmospheric electric circuit; Global climate;

D O I：

10.1016/j.jastp.2008.07.001

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Statistically significant (at the 95% significance level) changes in daily cloud cover are found to occur globally over land coincident with extreme increases in 'fair-weather' measurements of vertical electric field (E-z) measured at Vostok, Antarctica. Using global cloud products from the International Satellite Cloud Climatology Project (ISCCP) D1 data series, superposed epoch analyses were made of both increases and decreases in E-z. Field significance testing revealed that, both before and after extreme increases in E-z, significant absolute cloud cover changes (of 13-15%) occur in the tropics and high latitudes. While the linkages in the tropics may reflect changes in the main convective cloud generators of current flow in the global circuit, the linkages at high latitudes appear to represent responses of clouds to the current flow. This linkage offers a possible explanation of a possible solar-terrestrial climate amplification mechanism. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1633 / 1642

页数：10

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