AERONET Remotely Sensed Measurements and Retrievals of Biomass Burning Aerosol Optical Properties During the 2015 Indonesian Burning Season
AERONET Remotely Sensed Measurements and Retrievals of Biomass Burning Aerosol Optical Properties During the 2015 Indonesian Burning Season
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DOI：
10.1029/2018jd030182
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发表时间：
2019-04-27
影响因子：
4.4
通讯作者：
Aldrian, Edvin
中科院分区：
文献类型：
--
作者：
Eck, T. F.;Holben, B. N.;Aldrian, Edvin
2015 年 9 月至 10 月，由于严重干旱（部分原因是厄尔尼诺现象造成），印度尼西亚发生了一次极端生物质燃烧事件，导致之前已排干的泥炭地大量燃烧。该事件具有全球气溶胶机器人网络（AERONET）监测到的最高持续气溶胶光学深度（AOD）。新开发的 AERONET 版本 3 算法在与高埃指数 (AE) 相关时在较长波长下保持高 AOD，从而允许在 675 nm 处测量高达大约 7 的 AOD，这是太阳光度测定的上限。随后利用在最高监测 AOD 水平下测量的 AE 来估计 550 nm 处的 AOD 瞬时值，范围为 11 至 13，远远超出测量上限。此外，由于能够利用新的混合天空辐射扫描以较小的太阳天顶角进行检索，因此能够以比 almucantar 扫描高得多的 AOD 水平检索复杂的折射率、尺寸分布和单散射反照率 (SSA)。对于在最高 AOD 水平下进行的检索，精细模式体积中值半径类似于 0.25-0.30 微米，这是用于生物质燃烧的非常大的颗粒。非常高的 SSA 值（在 440 至 1,020 nm 范围内接近 0.975）与泥炭燃烧的阴燃燃烧占主导地位一致。根据检索到的 SSA 和实验室测量的泥炭 SSA，对泥炭对总生物量燃烧气溶胶的贡献百分比的估计与 80-85% 相似，与独立估计非常一致。
An extreme biomass burning event occurred in Indonesia from September through October 2015 due to severe drought conditions, partially caused by a major El Nino event, thereby allowing for significant burning of peatland that had been previously drained. This event had the highest sustained aerosol optical depths (AODs) ever monitored by the global Aerosol Robotic Network (AERONET). The newly developed AERONET Version 3 algorithms retain high AOD at the longer wavelengths when associated with high Angstrom exponents (AEs), which thereby allowed for measurements of AOD at 675 nm as high as approximately 7, the upper limit of Sun photometry. Measured AEs at the highest monitored AOD levels were subsequently utilized to estimate instantaneous values of AOD at 550 nm in the range of 11 to 13, well beyond the upper measurement limit. Additionally, retrievals of complex refractive indices, size distributions, and single scattering albedos (SSAs) were obtained at much higher AOD levels than possible from almucantar scans due to the ability to perform retrievals at smaller solar zenith angles with new hybrid sky radiance scans. For retrievals made at the highest AOD levels the fine-mode volume median radii were similar to 0.25-0.30 micron, which are very large particles for biomass burning. Very high SSA values (similar to 0.975 from 440 to 1,020 nm) are consistent with the domination by smoldering combustion of peat burning. Estimates of the percentage peat contribution to total biomass burning aerosol based on retrieved SSA and laboratory measured peat SSA were similar to 80-85%, in excellent agreement with independent estimates.