Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno

The significant radiative impacts of black carbon (BC) and brown carbon (BrC) have been increasingly recognized but remain highly uncertain. The Aerosol Robotic Network (AERONET) provides measurements of aerosol absorption optical depths (AAOD) and other parameters which could be used to estimate BC...

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Main Author: Chen, Sijie
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: eScholarship, University of California 2018
Subjects:
Online Access:http://www.escholarship.org/uc/item/9zg7b35f
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spelling ftcdlib:qt9zg7b35f 2023-05-15T13:06:44+02:00 Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno Chen, Sijie 78 2018-01-01 application/pdf http://www.escholarship.org/uc/item/9zg7b35f en eng eScholarship, University of California http://www.escholarship.org/uc/item/9zg7b35f qt9zg7b35f public Chen, Sijie. (2018). Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno. UC San Diego: Earth Sciences. Retrieved from: http://www.escholarship.org/uc/item/9zg7b35f Atmospheric sciences Remote sensing Absorption angstrom exponent AERONET Aerosol absorption optical depth Black carbon Brown carbon dissertation 2018 ftcdlib 2018-06-22T22:53:07Z The significant radiative impacts of black carbon (BC) and brown carbon (BrC) have been increasingly recognized but remain highly uncertain. The Aerosol Robotic Network (AERONET) provides measurements of aerosol absorption optical depths (AAOD) and other parameters which could be used to estimate BC and BrC absorption across its global network, but the uncertainty of the apportionment method is not well understood. Surface measurements of aerosol optical properties were collected from January 13 to February 10, 2013, and from December 25, 2014, to January 13, 2015, at Fresno, California. This work compares the BC and BrC fractions from AERONET measurements apportioned by the absorption angstrom exponent (AAE) method and from the in situ measurements apportioned by the mass absorption coefficients (MAC) and thermodenuder (TD) method and scaled to planetary boundary layer height (PBLH). During the 2013 campaign, the AERONET apportionment shows that BC contributes 67% and BrC contributes 33% of the absorption at 440 nm while the in situ apportionment shows that BC contributes 89% and BrC contributes 11% of the absorption at 405 nm. During the 2014 campaign, the fraction is 72% BC and 28% BrC from the AERONET apportionment, and 68% BC and 32% BrC from the in situ apportionment. The comparisons show stronger correlations between AERONET and in situ measurements in 2014. These results show that the estimates of BC and BrC absorption from AERONET measurements using the AERONET-AAE method have good agreement with in situ estimates when the surface measurements are representative of the column properties. Doctoral or Postdoctoral Thesis Aerosol Robotic Network University of California: eScholarship
institution Open Polar
collection University of California: eScholarship
op_collection_id ftcdlib
language English
topic Atmospheric sciences
Remote sensing
Absorption angstrom exponent
AERONET
Aerosol absorption optical depth
Black carbon
Brown carbon
spellingShingle Atmospheric sciences
Remote sensing
Absorption angstrom exponent
AERONET
Aerosol absorption optical depth
Black carbon
Brown carbon
Chen, Sijie
Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno
topic_facet Atmospheric sciences
Remote sensing
Absorption angstrom exponent
AERONET
Aerosol absorption optical depth
Black carbon
Brown carbon
description The significant radiative impacts of black carbon (BC) and brown carbon (BrC) have been increasingly recognized but remain highly uncertain. The Aerosol Robotic Network (AERONET) provides measurements of aerosol absorption optical depths (AAOD) and other parameters which could be used to estimate BC and BrC absorption across its global network, but the uncertainty of the apportionment method is not well understood. Surface measurements of aerosol optical properties were collected from January 13 to February 10, 2013, and from December 25, 2014, to January 13, 2015, at Fresno, California. This work compares the BC and BrC fractions from AERONET measurements apportioned by the absorption angstrom exponent (AAE) method and from the in situ measurements apportioned by the mass absorption coefficients (MAC) and thermodenuder (TD) method and scaled to planetary boundary layer height (PBLH). During the 2013 campaign, the AERONET apportionment shows that BC contributes 67% and BrC contributes 33% of the absorption at 440 nm while the in situ apportionment shows that BC contributes 89% and BrC contributes 11% of the absorption at 405 nm. During the 2014 campaign, the fraction is 72% BC and 28% BrC from the AERONET apportionment, and 68% BC and 32% BrC from the in situ apportionment. The comparisons show stronger correlations between AERONET and in situ measurements in 2014. These results show that the estimates of BC and BrC absorption from AERONET measurements using the AERONET-AAE method have good agreement with in situ estimates when the surface measurements are representative of the column properties.
format Doctoral or Postdoctoral Thesis
author Chen, Sijie
author_facet Chen, Sijie
author_sort Chen, Sijie
title Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno
title_short Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno
title_full Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno
title_fullStr Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno
title_full_unstemmed Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno
title_sort comparison of bc and brc absorption from aeronet and in situ apportionment at wintertime fresno
publisher eScholarship, University of California
publishDate 2018
url http://www.escholarship.org/uc/item/9zg7b35f
op_coverage 78
genre Aerosol Robotic Network
genre_facet Aerosol Robotic Network
op_source Chen, Sijie. (2018). Comparison of BC and BrC Absorption from AERONET and In Situ Apportionment at Wintertime Fresno. UC San Diego: Earth Sciences. Retrieved from: http://www.escholarship.org/uc/item/9zg7b35f
op_relation http://www.escholarship.org/uc/item/9zg7b35f
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op_rights public
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