[口头报告]人为热释放对全球气候的影响及机理探索

人为热释放对全球气候的影响及机理探索
编号:2332 稿件编号:2646 访问权限:私有 更新:2023-05-04 21:22:28 浏览:199次 口头报告

报告开始:2023年05月07日 10:45 (Asia/Shanghai)

报告时间:10min

所在会议:[13B] 13B、大气物理与气象气候 » [13B-1] 13B-1 大气物理和大气探测

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摘要
Anthropogenic Heat Release (AHR) is the heat generated in global energy consumption, which has not been considered in global climate models generally. The global high-resolution AHR from 1992 to 2013, which is estimated by using the Defense Meteorological Satellite Program (DMSP)/Operational Linescan System (OLS) satellite data, is implementedinto the Community Atmosphere Model version 5 (CAM5). The seasonal climatic effects and possible feedbacks of AHR are examined in this study. The modeling results show that AHR increases the global annual mean surface temperature and land surface temperature by 0.02±0.01 K (1σ uncertainty) and 0.05±0.02 K (1σ uncertainty), respectively. The global climatic effect of AHR varies with season: with a stronger climatic effect in the boreal winter leading to global mean land surface temperature increases by 0.10±0.01 K (1σ uncertainty). In the selected regions (40°N – 60°N, 0°E – 45°E) of Central and Western Europe the average surface temperature increases by 0.46 K in the boreal summer, and in the selected regions (45°N – 75°N, 30°E – 140°E) of northern Eurasia the average surface temperature increases by 0.83 K in the boreal winter. AHR changes the height and thermodynamic structure of the global planetary boundary layer, as well as the stability of the lower troposphere, which affects the global atmospheric circulation and low cloud fraction. Our results show that the precipitation in high latitudes of the Northern Hemisphere tends to increase due to the inhomogeneous heating effect of AHR. In addition, at the surface both the shortwave radiation flux in the boreal summer and the down-welling longwave flux in the boreal winter change significantly, as a result of the change in low clouds caused by the effect of AHR. This study suggests a possible new mechanism of AHR effect on global climate through changing the global low-cloud fraction, which is crucial for global energy balance, by modifying the thermodynamic structure and stability of the lower troposphere. Thus this study improves our understanding of the global climate change caused by human activities.

 
关键字
anthropogenic heat release, climatic effect, climate feedback, global warming
报告人
陈兵
副教授 云南大学

稿件作者
陈兵 云南大学
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