Aerosol particle vertical distributions and optical properties over Singapore
Aerosol particle vertical distributions and optical properties over Singapore
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DOI：
10.1016/j.atmosenv.2013.06.026
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发表时间：
2013-11-01
影响因子：
5
通讯作者：
Liew, Soo Chin
中科院分区：
文献类型：
--
作者：
Chew, Boon Ning;Campbell, James R.;Liew, Soo Chin
作为东南亚七项研究方案的一部分，在新加坡部署了一个气溶胶机器人网络太阳光度计和一个微脉冲激光雷达网络仪器，以研究海洋大陆的区域气溶胶环境。利用2009年9月24日至2011年3月31日AERONET Level 2.0和MPLNET Level 2.0a同步观测资料，研究了气溶胶粒子垂直分布和光学特性的季节变化。平均而言，气溶胶消光的大部分（类似于65%）被发现低于1.5公里，大量的气溶胶负载（类似于35%）以上。可能是由于过渡到厄尔尼诺拉妮菲亚条件和随后减少火灾事件，MPLNET平均综合气溶胶消光观察到2010年7月至9月是最低的，这与典型的MC生物质燃烧季节相吻合。另一方面，2010年1月至3月和2011年的平均综合排放量最高，这可以归因于淡季MC生物质燃烧烟雾和人为污染。季节性激光雷达的比率也显示较高的发生率>60 SR，这是生物质燃烧烟雾的指示，2009年10月至2010年6月，但这种情况减少，从2010年7月至2011年3月时，拉妮菲亚条件占上风。此外，主成分分析（PCA）确定了新加坡上空五种主要的气溶胶垂直廓线类型，即强覆盖/深近地层（SCD; 0-1.35公里），增强中层（EML; 1.35-2.4 km）、增强上层（EUL; 2.4-3.525 km）、深毗连层（DCL; 3.525-4.95 km）和深多层（DML; >4.95 km）。PCA还确定了2010年2月22日至3月8日的淡季MC生物质燃烧烟雾事件，随后对其进行了详细审查。(C)2013爱思唯尔有限公司保留所有权利。
As part of the Seven Southeast Asian Studies (7SEAS) program, an Aerosol Robotic Network (AERONET) sun photometer and a Micro-Pulse Lidar Network (MPLNET) instrument have been deployed at Singapore to study the regional aerosol environment of the Maritime Continent (MC). Using coincident AERONET Level 2.0 and MPLNET Level 2.0a data from 24 September 2009 to 31 March 2011, the seasonal variability of aerosol particle vertical distributions and optical properties is examined. On average, the bulk (similar to 65%) of aerosol extinction is found below 1.5 km with substantial aerosol loading (similar to 35%) above. Possibly due to the transition from El Nifio to La Nifia conditions and subsequent reduction in fire events, the MPLNET mean integrated aerosol extinction is observed to be the lowest for July September 2010, which coincides with the typical MC biomass burning season. On the other hand, the highest mean integrated extinctions are derived for January March 2010 and 2011, which can be attributed to off-season MC biomass burning smoke and anthropogenic pollution. The seasonal lidar ratios also show higher occurrences >60 sr, which are indicative of biomass burning smoke, for October 2009 June 2010, but such occurrences decrease from July 2010 to March 2011 when La Nifia conditions prevail. In addition, principal component analysis (PCA) identifies five primary aerosol vertical profile types over Singapore, i.e. strongly-capped/deep near-surface layer (SCD; 0-1.35 km), enhanced mid-level layer (EML; 1.35-2.4 km), enhanced upper-level layer (EUL; 2.4-3.525 km), deep contiguous layer (DCL; 3.525-4.95 km) and deep multi-layer (DML; >4.95 km). PCA also identifies an off-season MC biomass burning smoke event from 22 February to 8 March 2010, which is subsequently examined in detail. (C) 2013 Elsevier Ltd. All rights reserved.