Remote sensing and in-situ measurements of tropospheric aerosol, a PAMARCMiP case study

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• 作者：Anne Hoffmann^a ; ^{anne.hoffmann@awi.de} ; Lukas Osterloh^b ; ^{lukas.osterloh@googlemail.com} ; Robert Stone^c ; ^{robert.stone@noaa.gov} ; Astrid Lampert^a ; ¹ ; ^{astrid.lampert@tu-bs.de} ; Christoph Ritter^a ; Maria Stock^a ; Peter Tunved^d ; ^{peter.tunved@itm.su.se} ; Tabea Hennig^d ; Christine Bö ; ckmann^b ; Shao-Meng Li^e ; ^{shao-meng.li@ec.gc.ca} ; Kostas Eleftheriadis^f ; ^{elefther@ipta.demokritos.gr} ; Marion Maturilli^a ; Thomas Orgis^a ; Andreas Herber^g ; ^{andreas.herber@awi.de} ; Roland Neuber^a ; Klaus Dethloff^a
• 关键词：Arctic ; Aerosols ; Lidar ; Arctic haze
• 刊名：Atmospheric Environment
• 出版年：2012
• 期刊代码：11_13522310
• 类别：env
• 出版时间：June, 2012
• 卷：52
• 期：Complete
• 页码：56-66
• 文件大小：1131 K

摘要

In this work, a closure experiment for tropospheric aerosol is presented. Aerosol size distributions and single scattering albedo from remote sensing data are compared to those measured in-situ. An aerosol pollution event on 4 April 2009 was observed by ground based and airborne lidar and photometer in and聽around Ny-脜lesund, Spitsbergen, as well as by DMPS, nephelometer and particle soot absorption photometer at the nearby Zeppelin Mountain Research Station.

The presented measurements were conducted in an area of 40聽脳聽20聽km around Ny-脜lesund as part of the 2009 Polar Airborne Measurements and Arctic Regional Climate Model Simulation Project (PAMARCMiP). Aerosol mainly in the accumulation mode was found in the lower troposphere, however, enhanced backscattering was observed up to the tropopause altitude. A comparison of meteorological data available at different locations reveals a stable multi-layer-structure of the lower troposphere. It is followed by the retrieval of optical and microphysical aerosol parameters. Extinction values have been derived using two different methods, and it was found that extinction (especially in the UV) derived from Raman lidar data significantly surpasses the extinction derived from photometer AOD profiles. Airborne lidar data shows volume depolarization values to be less than 2.5%between 500聽m and 2.5聽km altitude, hence, particles in this range can be assumed to be of spherical shape. In-situ particle number concentrations measured at the聽Zeppelin Mountain Research Station at 474聽m altitude peak at about 0.18聽渭m diameter, which was also found for the microphysical inversion calculations performed at 850聽m and 1500聽m altitude. Number concentrations depend on the assumed extinction values, and slightly decrease with altitude as well as the effective particle diameter. A low imaginary part in the derived refractive index suggests weakly absorbing aerosols, which is confirmed by low black carbon concentrations, measured at the Zeppelin Mountain as well as on board the Polar 5 aircraft.