四川省天然源VOCs排放量的估算和时空分布

利用遥感影像解译的土地利用现状和植被资料,对四川省天然源VOCs的排放情况和时空分布进行研究,建立了四川省天然源VOCs的排放清单.2012年四川省天然源VOCs的排放量为1413.74kt.其中异戊二烯占29.4%,为415.53kt,单萜烯占30.2%,为427kt,其他VOCs占40.4%,为571.215kt.排放量具有夏季高冬季低的典型特征,夏季占全年排放量的44%,冬季占9%.天然源VOCs的排放主要集中在林地密集和日照时间长的达州、巴中、广元、绵阳、乐山、眉山、攀枝花等地.研究表明,四川省天然源臭氧潜势为6134kt, 二次气溶胶的生成潜势为136kt.这说明其对环境空气质量的影响不容忽视.

Studies on estimates of biogenic VOC emission and its temporal and spatial distribution in Sichuan

The objectives of this paper were: (1) to estimate the biogenic VOC (BVOCs) emissions and its temporal-spatial distributions; and (2) to develop biogenic VOCs emissions inventory of Sichuan based on the remote-sensing data regarding land use and vegetation. In 2012, the total annual biogenic VOCs emissions of Sichuan was estimated to be approximately 1470.82kt, of which isoprene, monoterpenes, and the other VOCs accounted for 429.54kt (29.2%), 445.22kt (30.3%), and 596.06kt (40.5%), respectively. The biogenic VOCs emissions exhibited strong seasonal patterns with emissions in summer being the maximum (accounting for 42.56% of the total) and in winter being the minimum (accounting for 10.43% of the total). The BVOCs emissions were mainly concentrated in the dense woodland areas where the duration of sunlight was relatively long such as Dazhou, Bazhong, Guangyuan, Mianyang , Leshan, Meishan and Panzhihua. The ozone formation potential (OFP) and the secondary organic aerosol formation potentials from the BVOCs were estimated to be 6134kt and 136kt, respectively, implying a significant impact on air quality.