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PFCs和SF6的辐射强迫与全球增温潜能

, PP. 225-233

Keywords: PFCsSF6辐射强迫,全球增温潜能(GWPs),全球温变潜能(GTPs),相关k-分布

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Abstract:

?PFCs和SF6作为臭氧消耗物质(ODSs)的部分替代物质,近年来排放量大大增加,作为控制排放的人造长寿命温室气体已经被列入《京都议定书》.本文采用最新的分子吸收数据库HITRAN2004中PFCs最主要的两种化合物C2F6和CF4的吸收截面和SF6的吸收截面数据,利用吸收系数重排法,建立了它们的不同谱带精度(998-带和17-带)的相关k-分布计算方案,比较了不同方案对计算结果的影响.在此基础上,采用高精度的998-带辐射计算方案研究了它们晴空大气和有云大气下的瞬时辐射效率和平流层调整的辐射效率,以及它们的全球增温潜能(GWP)和全球温变潜能(GTP).本文的研究表明:C2F6,CF4和SF6在有云大气下的平流层调整的辐射效率分别为0.346,0.098和0.680Wm-2ppbv-1(ppbv表示体积比为十亿分之一);自工业革命到2005年的辐射强迫分别为0.001,0.007和0.004Wm-2;根据IPCC(2007)给出的排放情景,到2100年的辐射强迫分别为0.008,0.036和0.037Wm-2.C2F6,CF4和SF6相对于CO2的100a的全球增温潜能GWP分别为17035,7597和31298;100a的脉冲排放的全球温变潜能GTPP分别为22468,10052和40935;持续排放的全球温变潜能GTPS分别为16498,355和30341.与其他长寿命人造温室气体一道,它们对全球变暖的长期影响不容忽视.

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