Validation of a modified AVHRR aerosol optical depth retrieval algorithm over Central Europe
The Advanced Very High Resolution Radiometer (AVHRR) carried on board the National Oceanic and Atmospheric Administration (NOAA) and the Meteorological Operational Satellite (MetOp) polar orbiting satellites is the only instrument offering more than 25 years of satellite data to analyse aerosols on...
Published in: | Atmospheric Measurement Techniques |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus
2010
|
Subjects: | |
Online Access: | https://doi.org/10.5194/amt-3-1255-2010 |
id |
ftempa:oai:dora:empa_1344 |
---|---|
record_format |
openpolar |
spelling |
ftempa:oai:dora:empa_1344 2023-05-15T13:06:51+02:00 Validation of a modified AVHRR aerosol optical depth retrieval algorithm over Central Europe Riffler, M. Popp, C. Hauser, A. Fontana, F. Wunderle, S. 2010 https://doi.org/10.5194/amt-3-1255-2010 eng eng Copernicus Atmospheric Measurement Techniques--Atmos. Meas. Tech.--journals:267--1867-1381--1867-8548 empa:1344 journal id: journals:267 issn: 1867-1381 e-issn: 1867-8548 ut: 000283661300006 local: 15842 scopus: 2-s2.0-79959866207 doi:10.5194/amt-3-1255-2010 Text Journal Article 2010 ftempa https://doi.org/10.5194/amt-3-1255-2010 2023-03-04T17:16:46Z The Advanced Very High Resolution Radiometer (AVHRR) carried on board the National Oceanic and Atmospheric Administration (NOAA) and the Meteorological Operational Satellite (MetOp) polar orbiting satellites is the only instrument offering more than 25 years of satellite data to analyse aerosols on a daily basis. The present study assessed a modified AVHRR aerosol optical depth τ a retrieval over land for Europe. The algorithm might also be applied to other parts of the world with similar surface characteristics like Europe, only the aerosol properties would have to be adapted to a new region. The initial approach used a relationship between Sun photometer measurements from the Aerosol Robotic Network (AERONET) and the satellite data to post-process the retrieved τ a . Herein a quasi-stand-alone procedure, which is more suitable for the pre-AERONET era, is presented. In addition, the estimation of surface reflectance, the aerosol model, and other processing steps have been adapted. The method's cross-platform applicability was tested by validating τ a from NOAA-17 and NOAA-18 AVHRR at 15 AERONET sites in Central Europe (40.5° N–50° N, 0° E–17° E) from August 2005 to December 2007. Furthermore, the accuracy of the AVHRR retrieval was related to products from two newer instruments, the Medium Resolution Imaging Spectrometer (MERIS) on board the Environmental Satellite (ENVISAT) and the Moderate Resolution Imaging Spectroradiometer (MODIS) on board Aqua/Terra. Considering the linear correlation coefficient R , the AVHRR results were similar to those of MERIS with even lower root mean square error RMSE. Not surprisingly, MODIS, with its high spectral coverage, gave the highest R and lowest RMSE. Regarding monthly averaged τ a , the results were ambiguous. Focusing on small-scale structures, R was reduced for all sensors, whereas the RMSE solely for MERIS substantially increased. Regarding larger areas like Central Europe, the error statistics were similar to the individual match-ups. This was mainly explained with ... Article in Journal/Newspaper Aerosol Robotic Network DORA Empa Atmospheric Measurement Techniques 3 5 1255 1270 |
institution |
Open Polar |
collection |
DORA Empa |
op_collection_id |
ftempa |
language |
English |
description |
The Advanced Very High Resolution Radiometer (AVHRR) carried on board the National Oceanic and Atmospheric Administration (NOAA) and the Meteorological Operational Satellite (MetOp) polar orbiting satellites is the only instrument offering more than 25 years of satellite data to analyse aerosols on a daily basis. The present study assessed a modified AVHRR aerosol optical depth τ a retrieval over land for Europe. The algorithm might also be applied to other parts of the world with similar surface characteristics like Europe, only the aerosol properties would have to be adapted to a new region. The initial approach used a relationship between Sun photometer measurements from the Aerosol Robotic Network (AERONET) and the satellite data to post-process the retrieved τ a . Herein a quasi-stand-alone procedure, which is more suitable for the pre-AERONET era, is presented. In addition, the estimation of surface reflectance, the aerosol model, and other processing steps have been adapted. The method's cross-platform applicability was tested by validating τ a from NOAA-17 and NOAA-18 AVHRR at 15 AERONET sites in Central Europe (40.5° N–50° N, 0° E–17° E) from August 2005 to December 2007. Furthermore, the accuracy of the AVHRR retrieval was related to products from two newer instruments, the Medium Resolution Imaging Spectrometer (MERIS) on board the Environmental Satellite (ENVISAT) and the Moderate Resolution Imaging Spectroradiometer (MODIS) on board Aqua/Terra. Considering the linear correlation coefficient R , the AVHRR results were similar to those of MERIS with even lower root mean square error RMSE. Not surprisingly, MODIS, with its high spectral coverage, gave the highest R and lowest RMSE. Regarding monthly averaged τ a , the results were ambiguous. Focusing on small-scale structures, R was reduced for all sensors, whereas the RMSE solely for MERIS substantially increased. Regarding larger areas like Central Europe, the error statistics were similar to the individual match-ups. This was mainly explained with ... |
format |
Article in Journal/Newspaper |
author |
Riffler, M. Popp, C. Hauser, A. Fontana, F. Wunderle, S. |
spellingShingle |
Riffler, M. Popp, C. Hauser, A. Fontana, F. Wunderle, S. Validation of a modified AVHRR aerosol optical depth retrieval algorithm over Central Europe |
author_facet |
Riffler, M. Popp, C. Hauser, A. Fontana, F. Wunderle, S. |
author_sort |
Riffler, M. |
title |
Validation of a modified AVHRR aerosol optical depth retrieval algorithm over Central Europe |
title_short |
Validation of a modified AVHRR aerosol optical depth retrieval algorithm over Central Europe |
title_full |
Validation of a modified AVHRR aerosol optical depth retrieval algorithm over Central Europe |
title_fullStr |
Validation of a modified AVHRR aerosol optical depth retrieval algorithm over Central Europe |
title_full_unstemmed |
Validation of a modified AVHRR aerosol optical depth retrieval algorithm over Central Europe |
title_sort |
validation of a modified avhrr aerosol optical depth retrieval algorithm over central europe |
publisher |
Copernicus |
publishDate |
2010 |
url |
https://doi.org/10.5194/amt-3-1255-2010 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_relation |
Atmospheric Measurement Techniques--Atmos. Meas. Tech.--journals:267--1867-1381--1867-8548 empa:1344 journal id: journals:267 issn: 1867-1381 e-issn: 1867-8548 ut: 000283661300006 local: 15842 scopus: 2-s2.0-79959866207 doi:10.5194/amt-3-1255-2010 |
op_doi |
https://doi.org/10.5194/amt-3-1255-2010 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
3 |
container_issue |
5 |
container_start_page |
1255 |
op_container_end_page |
1270 |
_version_ |
1766023377076617216 |