The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output

We explore the feasibility of an observation operator producing passive microwave brightness temperatures for sea ice at a frequency of 6.9 GHz. We investigate the influence of simplifying assumptions for the representation of sea ice vertical properties on the simulation of microwave brightness tem...

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Published in:The Cryosphere
Main Authors: Burgard, Clara, Notz, Dirk, Pedersen, Leif T., Tonboe, Rasmus T.
Format: Article in Journal/Newspaper
Language:English
Published: 2020
Subjects:
Online Access:https://orbit.dtu.dk/en/publications/255045b3-1c28-40d0-bdd3-c464eec0694c
https://doi.org/10.5194/tc-14-2369-2020
https://backend.orbit.dtu.dk/ws/files/218601981/Arctic_ocean_part_1.pdf
id ftdtupubl:oai:pure.atira.dk:publications/255045b3-1c28-40d0-bdd3-c464eec0694c
record_format openpolar
spelling ftdtupubl:oai:pure.atira.dk:publications/255045b3-1c28-40d0-bdd3-c464eec0694c 2023-12-17T10:23:16+01:00 The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output Burgard, Clara Notz, Dirk Pedersen, Leif T. Tonboe, Rasmus T. 2020 application/pdf https://orbit.dtu.dk/en/publications/255045b3-1c28-40d0-bdd3-c464eec0694c https://doi.org/10.5194/tc-14-2369-2020 https://backend.orbit.dtu.dk/ws/files/218601981/Arctic_ocean_part_1.pdf eng eng info:eu-repo/semantics/openAccess Burgard , C , Notz , D , Pedersen , L T & Tonboe , R T 2020 , ' The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output ' , Cryosphere , vol. 14 , no. 7 , pp. 2369-2386 . https://doi.org/10.5194/tc-14-2369-2020 /dk/atira/pure/sustainabledevelopmentgoals/climate_action SDG 13 - Climate Action article 2020 ftdtupubl https://doi.org/10.5194/tc-14-2369-2020 2023-11-22T23:59:21Z We explore the feasibility of an observation operator producing passive microwave brightness temperatures for sea ice at a frequency of 6.9 GHz. We investigate the influence of simplifying assumptions for the representation of sea ice vertical properties on the simulation of microwave brightness temperatures. We do so in a one-dimensional setup, using a complex 1D thermodynamic sea ice model and a 1D microwave emission model. We find that realistic brightness temperatures can be simulated in cold conditions from a simplified linear temperature profile and a simplified salinity profile as a function of depth in the ice. These realistic brightness temperatures can be obtained based on profiles interpolated to as few as five layers. Most of the uncertainty resulting from the simplifications is introduced by the simplification of the salinity profiles. In warm conditions, the simplified salinity profiles lead to brine volume fractions that are too high in the subsurface layer. To overcome this limitation, we suggest using a constant brightness temperature for the ice during warm conditions and treating melt ponds as water surfaces. Finally, in our setup, we cannot assess the effect of wet snow properties. As periods of snow with intermediate moisture content, typically occurring in spring and fall, locally last for less than a month, our approach allows one to estimate realistic brightness temperatures at 6.9 GHz from climate model output for most of the year. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Sea ice Technical University of Denmark: DTU Orbit Arctic Arctic Ocean The Cryosphere 14 7 2369 2386
institution Open Polar
collection Technical University of Denmark: DTU Orbit
op_collection_id ftdtupubl
language English
topic /dk/atira/pure/sustainabledevelopmentgoals/climate_action
SDG 13 - Climate Action
spellingShingle /dk/atira/pure/sustainabledevelopmentgoals/climate_action
SDG 13 - Climate Action
Burgard, Clara
Notz, Dirk
Pedersen, Leif T.
Tonboe, Rasmus T.
The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output
topic_facet /dk/atira/pure/sustainabledevelopmentgoals/climate_action
SDG 13 - Climate Action
description We explore the feasibility of an observation operator producing passive microwave brightness temperatures for sea ice at a frequency of 6.9 GHz. We investigate the influence of simplifying assumptions for the representation of sea ice vertical properties on the simulation of microwave brightness temperatures. We do so in a one-dimensional setup, using a complex 1D thermodynamic sea ice model and a 1D microwave emission model. We find that realistic brightness temperatures can be simulated in cold conditions from a simplified linear temperature profile and a simplified salinity profile as a function of depth in the ice. These realistic brightness temperatures can be obtained based on profiles interpolated to as few as five layers. Most of the uncertainty resulting from the simplifications is introduced by the simplification of the salinity profiles. In warm conditions, the simplified salinity profiles lead to brine volume fractions that are too high in the subsurface layer. To overcome this limitation, we suggest using a constant brightness temperature for the ice during warm conditions and treating melt ponds as water surfaces. Finally, in our setup, we cannot assess the effect of wet snow properties. As periods of snow with intermediate moisture content, typically occurring in spring and fall, locally last for less than a month, our approach allows one to estimate realistic brightness temperatures at 6.9 GHz from climate model output for most of the year.
format Article in Journal/Newspaper
author Burgard, Clara
Notz, Dirk
Pedersen, Leif T.
Tonboe, Rasmus T.
author_facet Burgard, Clara
Notz, Dirk
Pedersen, Leif T.
Tonboe, Rasmus T.
author_sort Burgard, Clara
title The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output
title_short The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output
title_full The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output
title_fullStr The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output
title_full_unstemmed The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output
title_sort arctic ocean observation operator for 6.9 ghz (arc3o)-part 1: how to obtain sea ice brightness temperatures at 6.9 ghz from climate model output
publishDate 2020
url https://orbit.dtu.dk/en/publications/255045b3-1c28-40d0-bdd3-c464eec0694c
https://doi.org/10.5194/tc-14-2369-2020
https://backend.orbit.dtu.dk/ws/files/218601981/Arctic_ocean_part_1.pdf
geographic Arctic
Arctic Ocean
geographic_facet Arctic
Arctic Ocean
genre Arctic
Arctic
Arctic Ocean
Sea ice
genre_facet Arctic
Arctic
Arctic Ocean
Sea ice
op_source Burgard , C , Notz , D , Pedersen , L T & Tonboe , R T 2020 , ' The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output ' , Cryosphere , vol. 14 , no. 7 , pp. 2369-2386 . https://doi.org/10.5194/tc-14-2369-2020
op_rights info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.5194/tc-14-2369-2020
container_title The Cryosphere
container_volume 14
container_issue 7
container_start_page 2369
op_container_end_page 2386
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