The Impact of Direct Aerosol Radiative Forcing on Surface Insolation and Spring Snowmelt in the Southern Sierra Nevada
The Impact of Direct Aerosol Radiative Forcing on Surface Insolation and Spring Snowmelt in the Southern Sierra Nevada
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DOI：
10.1175/jhm541.1
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发表时间：
2006-10
影响因子：
3.8
通讯作者：
Jinwon Kim;Y. Gu;K. Liou
中科院分区：
文献类型：
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作者：
Jinwon Kim;Y. Gu;K. Liou
为了了解大气气溶胶对以地形高度极端变化为特征的内华达山脉南部地表能量和水循环的区域影响，作者在一个区域气候模式试验中研究了1998年春季大气气溶胶对地表辐射强迫和积雪融化。在规定的气溶胶光学厚度为0.2的情况下，发现直接气溶胶辐射强迫主要通过减少地面日照来影响春季融雪，并且这些强迫对地面日照和融雪的影响随地形高度变化很大。气溶胶对地面辐射的直接强迫在各海拔高度均为负值。在2000米以下地区，气溶胶辐射强迫强度与海拔高度的关系基本一致，在2000米以上地区随海拔升高而减小。这种高度依赖性与云水含量和云形成频率基本一致有关。
Abstract To understand the regional impact of the atmospheric aerosols on the surface energy and water cycle in the southern Sierra Nevada characterized by extreme variations in terrain elevation, the authors examine the aerosol radiative forcing on surface insolation and snowmelt for the spring of 1998 in a regional climate model experiment. With a prescribed aerosol optical thickness of 0.2, it is found that direct aerosol radiative forcing influences spring snowmelt primarily by reducing surface insolation and that these forcings on surface insolation and snowmelt vary strongly following terrain elevation. The direct aerosol radiative forcing on surface insolation is negative in all elevations. It is nearly uniform in the regions below 2000 m and decreases with increasing elevation in the region above 2000 m. This elevation dependency in the direct aerosol radiative forcing on surface insolation is related to the fact that the amount of cloud water and the frequency of cloud formation are nearly unifor...