Airborne measurements of aerosol optical properties related to early spring transport of mid-latitude sources into the Arctic
Open Access
- 1 June 2010
- journal article
- research article
- Published by Copernicus GmbH in Atmospheric Chemistry and Physics
- Vol. 10 (11), 5011-5030
- https://doi.org/10.5194/acp-10-5011-2010
Abstract
Airborne lidar and in-situ measurements of the aerosol properties were conducted between Svalbard Island and Scandinavia in April 2008. Evidence of aerosol transport from Europe and Asia is given. The analysis of the aerosol optical properties based on a multiwavelength lidar (355, 532, 1064 nm) including volume depolarization at 355 nm aims at distinguishing the role of the different aerosol sources (Siberian wild fires, Eastern Asia and European anthropogenic emissions). Combining, first aircraft measurements, second FLEXPART simulations with a calculation of the PBL air fraction originating from the three different mid-latitude source regions, and third level-2 CALIPSO data products (i.e. backscatter coefficient 532 nm,volume depolarization and color ratio between 1064 and 532 nm in aerosol layers) along the transport pathways, appears a valuable approach to identify the role of the different aerosol sources even after a transport time larger than 4 days. Optical depth of the aerosol layers are always rather small (0.5) for the northeastern Asia emissions (i.e. an expected mixture of Asian pollution and dust), while low depolarization together with smaller and quasi constant color ratio (≈0.3) are observed for the Siberian biomass burning emissions. A similar difference is visible between two layers observed by the aircraft above Scandinavia. The analysis of the time evolution of the aerosol optical properties revealed by CALIPSO between Asia and Scandinavia shows a gradual decrease of the aerosol backscatter, depolarization ratio and color ratio which suggests the removal of the largest particles in the accumulation mode. A similar study conducted for a European plume has shown aerosol optical properties intermediate between the two Asian sources with color ratio never exceeding 0.4 and moderate depolarization ratio being always less than 8%, i.e. less aerosol from the accumulation mode.Keywords
This publication has 49 references indexed in Scilit:
- The CALIPSO Lidar Cloud and Aerosol Discrimination: Version 2 Algorithm and Initial Assessment of PerformanceJournal of Atmospheric and Oceanic Technology, 2009
- Biomass burning in Siberia and Kazakhstan as an important source for haze over the Alaskan Arctic in April 2008Geophysical Research Letters, 2009
- In-situ airborne observations of the microphysical properties of the Arctic tropospheric aerosol during late spring and summerTellus B: Chemical and Physical Meteorology, 2008
- Remote sensing retrievals of fine mode aerosol optical depth and impacts on its correlation with CO from biomass burningGeophysical Research Letters, 2007
- Arctic Air Pollution: Origins and ImpactsScience, 2007
- Use of probability distribution functions for discriminating between cloud and aerosol in lidar backscatter dataJournal of Geophysical Research: Solid Earth, 2004
- Multiyear aerosol observations with dual‐wavelength Raman lidar in the framework of EARLINETJournal of Geophysical Research: Solid Earth, 2004
- Investigations into free tropospheric new particle formation in the central Canadian arctic during the winter/spring transition as part of TOPSEJournal of Geophysical Research: Solid Earth, 2003
- Characterization of aerosol spatial distribution and optical properties over the Indian Ocean from airborne LIDAR and radiometry during INDOEX'99Journal of Geophysical Research: Solid Earth, 2002
- Relative importances of North America and Eurasia as sources of arctic aerosolAtmospheric Environment (1967), 1981