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Ground based measurements of aerosol properties using Microtops instruments

Pflug, Bringfried (2013) Ground based measurements of aerosol properties using Microtops instruments. AIP Conference Proceedings, 1531, pp. 588-591. American Institute of Physics (AIP). ISBN 978-0-7354-1155-5 ISSN 0094-243X

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Official URL: http://proceedings.aip.org/resource/2/apcpcs/1531/1/588_1


Atmospheric aerosols originate from a wide variety of sources in both the marine and the continental environments. Aerosol properties vary significantly in space and time depending upon whether the air mass is anthropogenic or natural, marine or continental, rural or urban. Aerosol particles influence the radiation field of the earth. Variations of aerosol properties in time and space are the dominating source of the variability of remote sensing signals in the optical spectral range. Consequently, the contribution of aerosols to the signals at top of the atmosphere must be accounted for remote sensing of the ocean and land surface, which is known as atmospheric correction. Validation of atmospheric correction procedures require ground based measurements of aerosol properties. Ground based measurements of aerosol properties give also a basis for validation of the aerosol models used by atmospheric correction algorithms. More, measurements of aerosol properties are useful for climate studies because aerosol particles have an impact on the radiation balance of the earth due to its influence on the radiation field. Ground based measurements of aerosol properties have been performed in the coastal area of the southern Baltic Sea and near Berlin with a Microtops II Sunphotometer and a Microtops II ozone monitor. The data set at the Baltic Sea includes 7 observation periods at 4 different locations. The present paper reports some experience how to perform and analyze measurements with the Microtops instruments. Some advice is provided both for measurements at the land surface and onboard ships. Finally some results are presented. Sunphotometer measurements over several years require a large effort to maintain accurate radiometric calibration of the instruments. Sensor calibration was found to be very stable. Sensor degradation per year is less than 0.1% with exception of the 1020 nm channel, where it is about 1% per year. The dataset includes very clear and very turbid conditions. Situations with dominating large aerosol particles have been observed as well as situations with dominating small aerosol particles. Aerosol optical thickness at 550 nm varies from 0.04 to 0.7 and the Angstrœm exponent ranges from 0.25 to 1.8. Variations of the observed optical aerosol parameters in the coastal area show no clear relation to the related wind and humidity conditions, because the dataset is still too small for this kind of analysis. Validation of atmospheric correction algorithms is demonstrated with a comparison of column aerosol optical thickness resulting from satellite data with aerosol optical thickness from ground based measurements at time of satellite overpass. The agreement is better than ±0.03 at 750 nm. Another example uses the aerosol properties found from ground based measurements as input to radiative transfer modeling of the signals received at satellite. The agreement between modeled and measured signals is fine within the expectable uncertainty.

Item URL in elib:https://elib.dlr.de/77080/
Document Type:Article
Additional Information:http://dx.doi.org/10.1063/1.4804838
Title:Ground based measurements of aerosol properties using Microtops instruments
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pflug, Bringfriedbringfried.pflug (at) dlr.deUNSPECIFIED
Date:May 2013
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 588-591
UNSPECIFIEDAmerican Institute of Physics
Publisher:American Institute of Physics (AIP)
Series Name:AIP Conference Proceedings
Keywords:Microtops, Aerosols, Ground Base Measurements
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Remote Sensing Technology Institute > Photogrammetry and Image Analysis
Deposited On:18 Jan 2013 09:42
Last Modified:31 Jul 2019 19:37

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