Abstract

A global warming potential of albedo (GWP_A) is proposed, that represents the carbon dioxide emissions equivalent to a 0.01 increase in albedo over 1 m² of horizontal surface. A survey of prior literature suggests GWP_A ≈ −4.2 kgCO₂/m². Taking Los Angeles, CA as a test site for urban global warming mitigation actions, a residential “cool roof” project offers approximately seven times as much radiative forcing benefit from albedo change as from GHG reduction of energy efficiency; and a citywide increase to commercial building roof albedo offers radiative forcing benefit equivalent to the first 6½ years of all commercial sector GHG emission reductions proposed in the City of Los Angeles climate action plan. Discussion explores pathways and challenges to making albedo increases fungible with GHG reductions in GHG markets.

摘要

提出了一个全球变暖潜势的反照率 (GWP _A )，它表示相当于水平表面1 m ²的反照率增加 0.01 的二氧化碳排放量。对先前文献的调查表明 GWP _A ≈ -4.2 kgCO ₂ /m ². 以加利福尼亚州洛杉矶作为城市减缓全球变暖行动的试验场，一个住宅“凉爽屋顶”项目提供的辐射强迫收益大约是温室气体减少能源效率的七倍；全市范围内商业建筑屋顶反照率的增加提供的辐射强迫效益相当于洛杉矶市气候行动计划中提议的所有商业部门温室气体减排量的前 6.5 年。讨论探讨了使反照率增加与温室气体市场中的温室气体减少可替代的途径和挑战。