【摘要】 云通过辐射过程对地气系统的能量平衡起着特别显著的调节作用 ,是影响天气、气候以及全球变化的重要因子。近年来 ,有云大气对太阳短波辐射的“异常吸收”又成为云—辐射研究中的一个争论热点。有云大气的短波吸收受到多种因素的影响 ,关于这方面的研究还不够充分。本文通过计算 ,从理论上探讨了若干因素的组合对大气吸收的综合影响。在计算中 ,同时考虑了不同太阳辐射波段、不同太阳入射天顶角、不同云顶高度以及不同下垫面的影响 ,并考虑了包含大气分子、气溶胶和云滴的吸收与散射 ,以及在近红外波段大气自身的热辐射等过程 ,阐明了云与气溶胶在不同波段对大气吸收太阳辐射的影响。更多还原

【Abstract】 Clouds is the major contributor to modulating the energy balance of the earth atmosphere system, thereby it plays a key role in the weather, climate and globe changes. Studies on the interaction of clouds with radiation are important. In the investigations, a recent debate about the anomalous absorption of solar radiation in the cloudy atmosphere aroused widely interest. The problem relating to this is the basic knowledge of absorption in cloud and cloudy atmosphere is still inadequate. In this paper, a radiative transfer code-- DISORT is employed to calculate the absorptivity of cloudy atmosphere. After taking account of the affection of the molecular scattering, absorption and emission, the aerosol absorption and scattering and the cloud partical absorption and scattering, the impact of the cloud on radiation at different solar spectrum bands, solar zenith angles, cloud heights and underlying surfaces are considered. Some radiative properties of cloudy atmosphere in the solar radiation wave bands are shown.更多还原