On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic
Several types of filter-based instruments are used to estimate aerosol light absorption coefficients. Two significant results are presented based on Aethalometer measurements at six Arctic stations from 2012 to 2014. First, an alternative method of post-processing the Aethalometer data is presented,...
Published in: | Atmospheric Measurement Techniques |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2017
|
Subjects: | |
Online Access: | https://doi.org/10.5194/amt-10-5039-2017 https://noa.gwlb.de/receive/cop_mods_00007708 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007665/amt-10-5039-2017.pdf https://amt.copernicus.org/articles/10/5039/2017/amt-10-5039-2017.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007708 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007708 2023-05-15T14:47:05+02:00 On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic Backman, John Schmeisser, Lauren Virkkula, Aki Ogren, John A. Asmi, Eija Starkweather, Sandra Sharma, Sangeeta Eleftheriadis, Konstantinos Uttal, Taneil Jefferson, Anne Bergin, Michael Makshtas, Alexander Tunved, Peter Fiebig, Markus 2017-12 electronic https://doi.org/10.5194/amt-10-5039-2017 https://noa.gwlb.de/receive/cop_mods_00007708 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007665/amt-10-5039-2017.pdf https://amt.copernicus.org/articles/10/5039/2017/amt-10-5039-2017.pdf eng eng Copernicus Publications Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-10-5039-2017 https://noa.gwlb.de/receive/cop_mods_00007708 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007665/amt-10-5039-2017.pdf https://amt.copernicus.org/articles/10/5039/2017/amt-10-5039-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/amt-10-5039-2017 2022-02-08T22:58:22Z Several types of filter-based instruments are used to estimate aerosol light absorption coefficients. Two significant results are presented based on Aethalometer measurements at six Arctic stations from 2012 to 2014. First, an alternative method of post-processing the Aethalometer data is presented, which reduces measurement noise and lowers the detection limit of the instrument more effectively than boxcar averaging. The biggest benefit of this approach can be achieved if instrument drift is minimised. Moreover, by using an attenuation threshold criterion for data post-processing, the relative uncertainty from the electronic noise of the instrument is kept constant. This approach results in a time series with a variable collection time (Δt) but with a constant relative uncertainty with regard to electronic noise in the instrument. An additional advantage of this method is that the detection limit of the instrument will be lowered at small aerosol concentrations at the expense of temporal resolution, whereas there is little to no loss in temporal resolution at high aerosol concentrations ( > 2.1–6.7 Mm−1 as measured by the Aethalometers). At high aerosol concentrations, minimising the detection limit of the instrument is less critical. Additionally, utilising co-located filter-based absorption photometers, a correction factor is presented for the Arctic that can be used in Aethalometer corrections available in literature. The correction factor of 3.45 was calculated for low-elevation Arctic stations. This correction factor harmonises Aethalometer attenuation coefficients with light absorption coefficients as measured by the co-located light absorption photometers. Using one correction factor for Arctic Aethalometers has the advantage that measurements between stations become more inter-comparable. Article in Journal/Newspaper Arctic Niedersächsisches Online-Archiv NOA Arctic Atmospheric Measurement Techniques 10 12 5039 5062 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Backman, John Schmeisser, Lauren Virkkula, Aki Ogren, John A. Asmi, Eija Starkweather, Sandra Sharma, Sangeeta Eleftheriadis, Konstantinos Uttal, Taneil Jefferson, Anne Bergin, Michael Makshtas, Alexander Tunved, Peter Fiebig, Markus On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic |
topic_facet |
article Verlagsveröffentlichung |
description |
Several types of filter-based instruments are used to estimate aerosol light absorption coefficients. Two significant results are presented based on Aethalometer measurements at six Arctic stations from 2012 to 2014. First, an alternative method of post-processing the Aethalometer data is presented, which reduces measurement noise and lowers the detection limit of the instrument more effectively than boxcar averaging. The biggest benefit of this approach can be achieved if instrument drift is minimised. Moreover, by using an attenuation threshold criterion for data post-processing, the relative uncertainty from the electronic noise of the instrument is kept constant. This approach results in a time series with a variable collection time (Δt) but with a constant relative uncertainty with regard to electronic noise in the instrument. An additional advantage of this method is that the detection limit of the instrument will be lowered at small aerosol concentrations at the expense of temporal resolution, whereas there is little to no loss in temporal resolution at high aerosol concentrations ( > 2.1–6.7 Mm−1 as measured by the Aethalometers). At high aerosol concentrations, minimising the detection limit of the instrument is less critical. Additionally, utilising co-located filter-based absorption photometers, a correction factor is presented for the Arctic that can be used in Aethalometer corrections available in literature. The correction factor of 3.45 was calculated for low-elevation Arctic stations. This correction factor harmonises Aethalometer attenuation coefficients with light absorption coefficients as measured by the co-located light absorption photometers. Using one correction factor for Arctic Aethalometers has the advantage that measurements between stations become more inter-comparable. |
format |
Article in Journal/Newspaper |
author |
Backman, John Schmeisser, Lauren Virkkula, Aki Ogren, John A. Asmi, Eija Starkweather, Sandra Sharma, Sangeeta Eleftheriadis, Konstantinos Uttal, Taneil Jefferson, Anne Bergin, Michael Makshtas, Alexander Tunved, Peter Fiebig, Markus |
author_facet |
Backman, John Schmeisser, Lauren Virkkula, Aki Ogren, John A. Asmi, Eija Starkweather, Sandra Sharma, Sangeeta Eleftheriadis, Konstantinos Uttal, Taneil Jefferson, Anne Bergin, Michael Makshtas, Alexander Tunved, Peter Fiebig, Markus |
author_sort |
Backman, John |
title |
On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic |
title_short |
On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic |
title_full |
On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic |
title_fullStr |
On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic |
title_full_unstemmed |
On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic |
title_sort |
on aethalometer measurement uncertainties and an instrument correction factor for the arctic |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/amt-10-5039-2017 https://noa.gwlb.de/receive/cop_mods_00007708 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007665/amt-10-5039-2017.pdf https://amt.copernicus.org/articles/10/5039/2017/amt-10-5039-2017.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-10-5039-2017 https://noa.gwlb.de/receive/cop_mods_00007708 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007665/amt-10-5039-2017.pdf https://amt.copernicus.org/articles/10/5039/2017/amt-10-5039-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/amt-10-5039-2017 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
10 |
container_issue |
12 |
container_start_page |
5039 |
op_container_end_page |
5062 |
_version_ |
1766318208275447808 |