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Aerosol optical microphysical chemical and radiative properties of high aerosol load cases over the Arctic based on AERONET measurements

机译：基于AERONET测量的北极高气溶胶负荷情况的气溶胶光学微物理化学和辐射特性

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摘要

Columnar mass concentrations of aerosol components over the Arctic are estimated using microphysical parameters derived from direct sun extinction and sky radiance measurements of Aerosol Robotic Network. Aerosol optical, microphysical, chemical and radiative properties show that Arctic aerosols are dominated by fine mode particles, especially for high aerosol load cases. The average aerosol optical depth (AOD) of the selected Arctic sites in the sampling period is approximately 0.08, with 75% composed of fine mode particles. The fine mode fraction mostly exceeds 0.9 when AOD greater than 0.4. The ammonium sulfate-like component (AS) contributes about 68% of total dry aerosol mass for high-AOD events. The estimated compositions and back trajectories show that the transported aerosol particles from biomass burning events have large amounts of black carbon (BC) and brown carbon, while those from pollution events are characterised by large AS fractions. The instantaneous radiative forcing at the top-of-atmosphere is higher for the more absorbing components, and varies greatly with surface albedo and solar zenith angle. A regression model of columnar composition and radiative forcing within the atmosphere (RFATM) for Arctic aerosol is established, showing that BC dominates a positive RFATM with a high warming efficiency.
机译：北极的气溶胶成分的柱状质量浓度是使用直接从太阳消光和气溶胶机器人网络的天空辐射测量得出的微物理参数估算得出的。气溶胶的光学，微物理，化学和辐射特性表明，北极气溶胶主要由精细模式粒子占据，特别是在高气溶胶负载情况下。采样期间选定北极地区的平均气溶胶光学深度（AOD）约为0.08，其中75％由精细模式粒子组成。当AOD大于0.4时，精细模式分数大部分超过0.9。对于高AOD事件，类硫酸铵成分（AS）占总干燥气溶胶质量的68％。估计的成分和反向轨迹表明，来自生物质燃烧事件的运输气溶胶颗粒具有大量的黑碳（BC）和棕碳，而来自污染事件的气溶胶颗粒具有较大的AS分数。对于吸收性更高的成分，大气顶部的瞬时辐射强迫较高，并且随表面反照率和太阳天顶角而变化很大。建立了北极气溶胶柱状成分和大气中辐射强迫（RFATM）的回归模型，表明BC以高升温效率主导了正RFATM。

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