Impact of deforestation in the Amazon basin on cloud climatology

被引：133

作者：

Wang, Jingfeng ^{[1
]}

Chagnon, Frederic J. F. ^{[1
]}

Williams, Earle R. ^{[1
]}

Betts, Alan K. ^{[2
]}

Renno, Nilton O. ^{[3
]}

Machado, Luiz A. T. ^{[4
]}

Bisht, Gautam ^{[1
]}

Knox, Ryan ^{[1
]}

Brase, Rafael L. ^{[5
]}

机构：

[1] MIT, Dept Civil & Environm Engn, Cambridge, MA 02139 USA

[2] Atmospher Res, Pittsford, VT 05763 USA

[3] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA

[4] Inst Nacl Presquisa Espaciais, Satellites & Environm Div, BR-12630000 Sao Paulo, Brazil

[5] Univ Calif Irvine, Henry Samueli Sch Engn, Irvine, CA 92967 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2009年 / 106卷 / 10期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

climate; land-cover heterogeneity; mesoscale circulations; LINEAR-THEORY; LAND-SURFACE; RAINFALL; FOREST; ELECTRIFICATION; SENSITIVITY; SMOKE;

D O I：

10.1073/pnas.0810156106

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Shallow clouds are prone to appear over deforested surfaces whereas deep clouds, much less frequent than shallow clouds, favor forested surfaces. Simultaneous atmospheric soundings at forest and pasture sites during the Rondonian Boundary Layer Experiment (RBLE-3) elucidate the physical mechanisms responsible for the observed correlation between clouds and land cover. We demonstrate that the atmospheric boundary layer over the forested areas is more unstable and characterized by larger values of the convective available potential energy ( CAPE) due to greater humidity than that which is found over the deforested area. The shallow convection over the deforested areas is relatively more active than the deep convection over the forested areas. This greater activity results from a stronger lifting mechanism caused by mesoscale circulations driven by deforestation-induced heterogeneities in land cover.

引用

页码：3670 / 3674

页数：5

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