Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product
Using the GlobAEROSOL-AATSR dataset, estimates of the instantaneous, clear-sky, direct aerosol radiative effect and radiative forcing have been produced for the year 2006. Aerosol Robotic Network sun-photometer measurements have been used to characterise the random and systematic error in the GlobAE...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-13-393-2013 https://ora.ox.ac.uk/objects/uuid:270f33e5-7cad-41f2-8a88-82cb1305dbc0 |
id |
ftuloxford:oai:ora.ox.ac.uk:uuid:270f33e5-7cad-41f2-8a88-82cb1305dbc0 |
---|---|
record_format |
openpolar |
spelling |
ftuloxford:oai:ora.ox.ac.uk:uuid:270f33e5-7cad-41f2-8a88-82cb1305dbc0 2023-05-15T13:07:01+02:00 Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product Thomas, G Chalmers, N Harris, B Grainger, R Highwood, E 2016-07-28 https://doi.org/10.5194/acp-13-393-2013 https://ora.ox.ac.uk/objects/uuid:270f33e5-7cad-41f2-8a88-82cb1305dbc0 eng eng doi:10.5194/acp-13-393-2013 https://ora.ox.ac.uk/objects/uuid:270f33e5-7cad-41f2-8a88-82cb1305dbc0 https://doi.org/10.5194/acp-13-393-2013 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.5194/acp-13-393-2013 2022-06-28T20:08:10Z Using the GlobAEROSOL-AATSR dataset, estimates of the instantaneous, clear-sky, direct aerosol radiative effect and radiative forcing have been produced for the year 2006. Aerosol Robotic Network sun-photometer measurements have been used to characterise the random and systematic error in the GlobAEROSOL product for 22 regions covering the globe. Representative aerosol properties for each region were derived from the results of a wide range of literature sources and, along with the de-biased GlobAEROSOL AODs, were used to drive an offline version of the Met Office unified model radiation scheme. In addition to the mean AOD, best-estimate run of the radiation scheme, a range of additional calculations were done to propagate uncertainty estimates in the AOD, optical properties, surface albedo and errors due to the temporal and spatial averaging of the AOD fields. This analysis produced monthly, regional estimates of the clear-sky aerosol radiative effect and its uncertainty, which were combined to produce annual, global mean values of (-6.7 ± 3.9) W m-2 at the top of atmosphere (TOA) and (-12 ± 6) W m-2 at the surface. These results were then used to give estimates of regional, clear-sky aerosol direct radiative forcing, using modelled pre-industrial AOD fields for the year 1750 calculated for the AEROCOM PRE experiment. However, as it was not possible to quantify the uncertainty in the pre-industrial aerosol loading, these figures can only be taken as indicative and their uncertainties as lower bounds on the likely errors. Although the uncertainty on aerosol radiative effect presented here is considerably larger than most previous estimates, the explicit inclusion of the major sources of error in the calculations suggest that they are closer to the true constraint on this figure from similar methodologies, and point to the need for more, improved estimates of both global aerosol loading and aerosol optical properties. © 2013 Author(s). Article in Journal/Newspaper Aerosol Robotic Network ORA - Oxford University Research Archive Atmospheric Chemistry and Physics 13 1 393 410 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
description |
Using the GlobAEROSOL-AATSR dataset, estimates of the instantaneous, clear-sky, direct aerosol radiative effect and radiative forcing have been produced for the year 2006. Aerosol Robotic Network sun-photometer measurements have been used to characterise the random and systematic error in the GlobAEROSOL product for 22 regions covering the globe. Representative aerosol properties for each region were derived from the results of a wide range of literature sources and, along with the de-biased GlobAEROSOL AODs, were used to drive an offline version of the Met Office unified model radiation scheme. In addition to the mean AOD, best-estimate run of the radiation scheme, a range of additional calculations were done to propagate uncertainty estimates in the AOD, optical properties, surface albedo and errors due to the temporal and spatial averaging of the AOD fields. This analysis produced monthly, regional estimates of the clear-sky aerosol radiative effect and its uncertainty, which were combined to produce annual, global mean values of (-6.7 ± 3.9) W m-2 at the top of atmosphere (TOA) and (-12 ± 6) W m-2 at the surface. These results were then used to give estimates of regional, clear-sky aerosol direct radiative forcing, using modelled pre-industrial AOD fields for the year 1750 calculated for the AEROCOM PRE experiment. However, as it was not possible to quantify the uncertainty in the pre-industrial aerosol loading, these figures can only be taken as indicative and their uncertainties as lower bounds on the likely errors. Although the uncertainty on aerosol radiative effect presented here is considerably larger than most previous estimates, the explicit inclusion of the major sources of error in the calculations suggest that they are closer to the true constraint on this figure from similar methodologies, and point to the need for more, improved estimates of both global aerosol loading and aerosol optical properties. © 2013 Author(s). |
format |
Article in Journal/Newspaper |
author |
Thomas, G Chalmers, N Harris, B Grainger, R Highwood, E |
spellingShingle |
Thomas, G Chalmers, N Harris, B Grainger, R Highwood, E Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product |
author_facet |
Thomas, G Chalmers, N Harris, B Grainger, R Highwood, E |
author_sort |
Thomas, G |
title |
Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product |
title_short |
Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product |
title_full |
Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product |
title_fullStr |
Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product |
title_full_unstemmed |
Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product |
title_sort |
regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the globaerosol-aatsr satellite aerosol product |
publishDate |
2016 |
url |
https://doi.org/10.5194/acp-13-393-2013 https://ora.ox.ac.uk/objects/uuid:270f33e5-7cad-41f2-8a88-82cb1305dbc0 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_relation |
doi:10.5194/acp-13-393-2013 https://ora.ox.ac.uk/objects/uuid:270f33e5-7cad-41f2-8a88-82cb1305dbc0 https://doi.org/10.5194/acp-13-393-2013 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.5194/acp-13-393-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
1 |
container_start_page |
393 |
op_container_end_page |
410 |
_version_ |
1766031044075585536 |