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监测研究表明:青藏高原大气环境洁净

2017-08-10 11:24:23   新华网

新华社拉萨8月10日电(记者黄兴)科学家长期监测研究发现,青藏高原大气近地面气溶胶的质量浓度水平较低。这一新的监测研究结果再次表明,青藏高原大气环境洁净。

气溶胶是人为排放的大气颗粒物,工业污染、火山喷发等形成的,能显著改变大气的化学组成,成为评估气候变化的最不确定因素之一。学术界对青藏高原大气气溶胶知之甚少,缺乏覆盖典型区域的系统监测。

中国科学院青藏高原研究所自2011年秋季起,和中科院大气物理研究所、西北生态环境资源研究院合作,依托野外观测台站,对青藏高原阿里、珠峰、纳木错和藏东南地区背景大气气溶胶开展长期连续监测。

结果发现,青藏高原大气近地面气溶胶的质量浓度水平较低,细颗粒物(PM2.5)浓度具有显著的日变化特征。

中科院青藏高原研究所研究员丛志远表示,遥感结果进一步表明,青藏高原气溶胶总浓度在空间上呈现明显差异,与对应的陆地生态系统相关,即高山荒漠区域高于草甸和森林区域,而细颗粒物所占比率则为草甸和森林区域高于高山荒漠。

据丛志远介绍,这项研究提升了对青藏高原大气气溶胶载荷时空变化的认识,为评价这一地区大气环境质量提供了第一手资料,也为区域气候模型提供了重要基础数据。这一研究成果近日发表在大气科学领域著名期刊《大气化学与物理学》。

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