The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) - Part 2: Development and evaluation
The observational uncertainty in sea-ice-concentration estimates from remotely-sensed passive-microwave brightness temperatures is a challenge for reliable climate model evaluation and initialization. To address this challenge, we introduce a new tool: the Arctic Ocean Observation Operator (ARC3O)....
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ftpubman:oai:pure.mpg.de:item_3212802 2024-09-15T17:53:18+00:00 The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) - Part 2: Development and evaluation Burgard, C. Notz, D. Pedersen, L. Tonboe, R. 2020-07-23 application/pdf text/plain http://hdl.handle.net/21.11116/0000-0005-D494-4 http://hdl.handle.net/21.11116/0000-0006-DFC8-E http://hdl.handle.net/21.11116/0000-0006-E326-F eng eng info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-14-2387-2020 http://hdl.handle.net/21.11116/0000-0005-D494-4 http://hdl.handle.net/21.11116/0000-0006-DFC8-E http://hdl.handle.net/21.11116/0000-0006-E326-F info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ The Cryosphere info:eu-repo/semantics/article 2020 ftpubman https://doi.org/10.5194/tc-14-2387-2020 2024-06-25T14:12:28Z The observational uncertainty in sea-ice-concentration estimates from remotely-sensed passive-microwave brightness temperatures is a challenge for reliable climate model evaluation and initialization. To address this challenge, we introduce a new tool: the Arctic Ocean Observation Operator (ARC3O). ARC3O allows us to simulate brightness temperatures at 6.9 GHz at vertical polarisation from standard output of an Earth System Model. We evaluate ARC3O by simulating brightness temperatures based on three assimilation runs of the MPI Earth System Model (MPI-ESM) assimilated with three different sea-ice concentration products. We then compare these three sets of simulated brightness temperatures to brightness temperatures measured by the Advanced Microwave Scanning Radiometer Earth Observing System (AMSR-E) from space. We find that they differ up to 10 K in the period between October and June, depending on the region and the assimilation run. However, we show that these discrepancies between simulated and observed brightness temperature can be mainly attributed to the underlying observational uncertainty in sea-ice concentration and, to a lesser extent, to the data assimilation process, rather than to biases in ARC3O itself. In summer, the discrepancies between simulated and observed brightness temperatures are larger than in winter and locally reach up to 20 K. This is caused by the very large observational uncertainty in summer sea-ice concentration but also by the melt-pond parametrization in MPI-ESM, which is not necessarily realistic. ARC3O is therefore capable to realistically translate the simulated Arctic Ocean climate state into one observable quantity for a more comprehensive climate model evaluation and initialization. Article in Journal/Newspaper Arctic Ocean Sea ice The Cryosphere Max Planck Society: MPG.PuRe The Cryosphere 14 7 2387 2407 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
The observational uncertainty in sea-ice-concentration estimates from remotely-sensed passive-microwave brightness temperatures is a challenge for reliable climate model evaluation and initialization. To address this challenge, we introduce a new tool: the Arctic Ocean Observation Operator (ARC3O). ARC3O allows us to simulate brightness temperatures at 6.9 GHz at vertical polarisation from standard output of an Earth System Model. We evaluate ARC3O by simulating brightness temperatures based on three assimilation runs of the MPI Earth System Model (MPI-ESM) assimilated with three different sea-ice concentration products. We then compare these three sets of simulated brightness temperatures to brightness temperatures measured by the Advanced Microwave Scanning Radiometer Earth Observing System (AMSR-E) from space. We find that they differ up to 10 K in the period between October and June, depending on the region and the assimilation run. However, we show that these discrepancies between simulated and observed brightness temperature can be mainly attributed to the underlying observational uncertainty in sea-ice concentration and, to a lesser extent, to the data assimilation process, rather than to biases in ARC3O itself. In summer, the discrepancies between simulated and observed brightness temperatures are larger than in winter and locally reach up to 20 K. This is caused by the very large observational uncertainty in summer sea-ice concentration but also by the melt-pond parametrization in MPI-ESM, which is not necessarily realistic. ARC3O is therefore capable to realistically translate the simulated Arctic Ocean climate state into one observable quantity for a more comprehensive climate model evaluation and initialization. |
format |
Article in Journal/Newspaper |
author |
Burgard, C. Notz, D. Pedersen, L. Tonboe, R. |
spellingShingle |
Burgard, C. Notz, D. Pedersen, L. Tonboe, R. The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) - Part 2: Development and evaluation |
author_facet |
Burgard, C. Notz, D. Pedersen, L. Tonboe, R. |
author_sort |
Burgard, C. |
title |
The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) - Part 2: Development and evaluation |
title_short |
The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) - Part 2: Development and evaluation |
title_full |
The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) - Part 2: Development and evaluation |
title_fullStr |
The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) - Part 2: Development and evaluation |
title_full_unstemmed |
The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) - Part 2: Development and evaluation |
title_sort |
arctic ocean observation operator for 6.9 ghz (arc3o) - part 2: development and evaluation |
publishDate |
2020 |
url |
http://hdl.handle.net/21.11116/0000-0005-D494-4 http://hdl.handle.net/21.11116/0000-0006-DFC8-E http://hdl.handle.net/21.11116/0000-0006-E326-F |
genre |
Arctic Ocean Sea ice The Cryosphere |
genre_facet |
Arctic Ocean Sea ice The Cryosphere |
op_source |
The Cryosphere |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-14-2387-2020 http://hdl.handle.net/21.11116/0000-0005-D494-4 http://hdl.handle.net/21.11116/0000-0006-DFC8-E http://hdl.handle.net/21.11116/0000-0006-E326-F |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5194/tc-14-2387-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
7 |
container_start_page |
2387 |
op_container_end_page |
2407 |
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1810295326909661184 |