期刊
ENVIRONMENTAL RESEARCH LETTERS
卷 14, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1748-9326/ab4872
关键词
black carbon; absorption enhancement; heating rate; cloud reflection
资金
- National Key Research and Development Program of China [2016YFA0602001]
- National Natural Science Foundation of China [41605108, 41875167, 41875044, 41505128, 41505129, 41775138, 41807313]
- National Center of Meteorology, Abu Dhabi, UAE under the UAE Research Program for Rain Enhancement Science
The fast development of a secondary aerosol layer was observed over megacities in eastern Asia during summertime. Within three hours, from midday to early afternoon, the contribution of secondary aerosols above the planetary boundary layer (PBL) increased by a factor of three to five, and the coatings on black carbon (BC) also increased and enhanced its absorption efficiency by 50%. This tended to result from the intensive actinic flux received above the PBL which promoted photochemical reactions. The absorption of BC could be further amplified by the strong reflection of solar radiation over the cloud top across the PBL. This enhanced heating effect of BC introduced by combined processes (intensive solar radiation, secondary formation and cloud reflection) may considerably increase the temperature inversion above the PBL. This mechanism should be considered when evaluating the radiative impact of BC, especially for polluted regions receiving strong solar radiation.
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