Assimilation of AERONET and MODIS AOT observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill
AbstractData assimilation of Aerosol Robotic Network (AERONET) and Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical thickness (AOT) for aerosol forecasting was tested within the Navy Aerosol Analysis Prediction System (NAAPS) framework, using variational and ensemble data assimi...
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ftopenaccessrep:oai:zenodo.org:77283 2023-10-25T01:28:16+02:00 Assimilation of AERONET and MODIS AOT observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill Jeffrey S. Reid Brent N. Holben Juli I. Rubin Douglas L. Westphal Peng Xian Jianglong Zhang James A. Hansen Jeffrey L. Anderson 2017-05-11 https://www.openaccessrepository.it/record/77283 https://doi.org/10.1002/2016jd026067 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/77283 doi:10.1002/2016jd026067 info:eu-repo/semantics/openAccess Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics info:eu-repo/semantics/article publication-article 2017 ftopenaccessrep https://doi.org/10.1002/2016jd026067 2023-09-26T22:18:55Z AbstractData assimilation of Aerosol Robotic Network (AERONET) and Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical thickness (AOT) for aerosol forecasting was tested within the Navy Aerosol Analysis Prediction System (NAAPS) framework, using variational and ensemble data assimilation methods. Navy aerosol forecasting currently makes use of a deterministic NAAPS simulation coupled to Navy Variational Data Assimilation System for aerosol optical depth, a two‐dimensional variational data assimilation system, for MODIS AOT assimilation. An ensemble version of NAAPS (ENAAPS) coupled to an ensemble adjustment Kalman filter (EAKF) from the Data Assimilation Research Testbed was recently developed, allowing for a range of data assimilation and forecasting experiments to be run with deterministic NAAPS and ENAAPS. The main findings are that the EAKF, with its flow‐dependent error covariances, makes better use of sparse observations such as AERONET AOT. Assimilating individual AERONET observations in the two‐dimensional variational system can increase the analysis errors when observations are located in high AOT gradient regions. By including AERONET with MODIS AOT assimilation, the magnitudes of peak aerosol events (AOT > 1) were better captured with improved temporal variability, especially in India and Asia where aerosol prediction is a challenge. Assimilating AERONET AOT with MODIS had little impact on the 24 h forecast skill compared to MODIS assimilation only, but differences were found downwind of AERONET sites. The 24 h forecast skill was approximately the same for forecasts initialized with analyses from AERONET AOT assimilation alone compared to MODIS assimilation, particularly in regions where the AERONET network is dense; including the United States and Europe, indicating that AERONET could serve as a backup observation network for over‐land synoptic‐scale aerosol events. Article in Journal/Newspaper Aerosol Robotic Network Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Journal of Geophysical Research: Atmospheres 122 9 4967 4992 |
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Open Polar |
collection |
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
op_collection_id |
ftopenaccessrep |
language |
English |
topic |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics |
spellingShingle |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics Jeffrey S. Reid Brent N. Holben Juli I. Rubin Douglas L. Westphal Peng Xian Jianglong Zhang James A. Hansen Jeffrey L. Anderson Assimilation of AERONET and MODIS AOT observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill |
topic_facet |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics |
description |
AbstractData assimilation of Aerosol Robotic Network (AERONET) and Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical thickness (AOT) for aerosol forecasting was tested within the Navy Aerosol Analysis Prediction System (NAAPS) framework, using variational and ensemble data assimilation methods. Navy aerosol forecasting currently makes use of a deterministic NAAPS simulation coupled to Navy Variational Data Assimilation System for aerosol optical depth, a two‐dimensional variational data assimilation system, for MODIS AOT assimilation. An ensemble version of NAAPS (ENAAPS) coupled to an ensemble adjustment Kalman filter (EAKF) from the Data Assimilation Research Testbed was recently developed, allowing for a range of data assimilation and forecasting experiments to be run with deterministic NAAPS and ENAAPS. The main findings are that the EAKF, with its flow‐dependent error covariances, makes better use of sparse observations such as AERONET AOT. Assimilating individual AERONET observations in the two‐dimensional variational system can increase the analysis errors when observations are located in high AOT gradient regions. By including AERONET with MODIS AOT assimilation, the magnitudes of peak aerosol events (AOT > 1) were better captured with improved temporal variability, especially in India and Asia where aerosol prediction is a challenge. Assimilating AERONET AOT with MODIS had little impact on the 24 h forecast skill compared to MODIS assimilation only, but differences were found downwind of AERONET sites. The 24 h forecast skill was approximately the same for forecasts initialized with analyses from AERONET AOT assimilation alone compared to MODIS assimilation, particularly in regions where the AERONET network is dense; including the United States and Europe, indicating that AERONET could serve as a backup observation network for over‐land synoptic‐scale aerosol events. |
format |
Article in Journal/Newspaper |
author |
Jeffrey S. Reid Brent N. Holben Juli I. Rubin Douglas L. Westphal Peng Xian Jianglong Zhang James A. Hansen Jeffrey L. Anderson |
author_facet |
Jeffrey S. Reid Brent N. Holben Juli I. Rubin Douglas L. Westphal Peng Xian Jianglong Zhang James A. Hansen Jeffrey L. Anderson |
author_sort |
Jeffrey S. Reid |
title |
Assimilation of AERONET and MODIS AOT observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill |
title_short |
Assimilation of AERONET and MODIS AOT observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill |
title_full |
Assimilation of AERONET and MODIS AOT observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill |
title_fullStr |
Assimilation of AERONET and MODIS AOT observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill |
title_full_unstemmed |
Assimilation of AERONET and MODIS AOT observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill |
title_sort |
assimilation of aeronet and modis aot observations using variational and ensemble data assimilation methods and its impact on aerosol forecasting skill |
publishDate |
2017 |
url |
https://www.openaccessrepository.it/record/77283 https://doi.org/10.1002/2016jd026067 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/77283 doi:10.1002/2016jd026067 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2016jd026067 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
122 |
container_issue |
9 |
container_start_page |
4967 |
op_container_end_page |
4992 |
_version_ |
1780737170445697024 |