Data for 'Surface heat fluxes drive a two-phase response in Southern Ocean mode water stratification'
The files contained here are the output/sensitivity files of four adjoint sensitivity experiments in ECCOv4r2 that are combined to create the sensitivity of large-scale stratification to surface heat flux. (-f/Delta z) * (-alpha * (ADJqnet_t1 - ADJqnet_t2) + beta * (ADJqnet_s1 - ADJqnet_s2)) (Equati...
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ftzenodo:oai:zenodo.org:8160115 2023-10-01T03:59:35+02:00 Data for 'Surface heat fluxes drive a two-phase response in Southern Ocean mode water stratification' Pimm, Ciara 2023-09-04 https://zenodo.org/record/8160115 https://doi.org/10.5281/zenodo.8160115 unknown doi:10.5281/zenodo.8160114 https://zenodo.org/record/8160115 https://doi.org/10.5281/zenodo.8160115 oai:zenodo.org:8160115 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode Adjoint ECCOv4r2 MITgcm info:eu-repo/semantics/other dataset 2023 ftzenodo https://doi.org/10.5281/zenodo.816011510.5281/zenodo.8160114 2023-09-05T23:02:03Z The files contained here are the output/sensitivity files of four adjoint sensitivity experiments in ECCOv4r2 that are combined to create the sensitivity of large-scale stratification to surface heat flux. (-f/Delta z) * (-alpha * (ADJqnet_t1 - ADJqnet_t2) + beta * (ADJqnet_s1 - ADJqnet_s2)) (Equation 7 in paper, where C = net heat flux). The files contained here are the output/sensitivity files for 6 years at 14 day time steps. ADJqnet_t1: (d J_1(theta_u)/ d qnet), Sensitivity of potential temperature over the upper depths to net heat flux. ADJqnet_t2: (d J_2(theta_l)/ d qnet), Sensitivity of potential temperature over the lower depths to net heat flux. ADJqnet_s1: (d J_3(salt_u)/ d qnet), Sensitivity of salinity over the upper depths to net heat flux. ADJqnet_s2: (d J_4(salt_l)/ d qnet), Sensitivity of salinity over the lower depths to net heat flux. Paper Abstract: Subantarctic mode waters (SAMW) have low stratification and are formed through subduction from thick winter mixed layers in the Southern Ocean. To investigate how external forcing affects the stratification in mode water formation regions in the Southern Ocean, we conduct a set of adjoint sensitivity experiments. The objective function is the annual-average stratification over the mode water formation region, which is evaluated from potential temperature and salinity adjoint sensitivity experiments. The analysis of impacts, from the product of sensitivities and forcing variability, identifies the separate effects of the wind stress, heat flux, and freshwater flux, revealing that the dominant control on stratification is from surface heat fluxes, as well as a smaller effect from zonal wind stress. The adjoint sensitivities of stratification to surface heat flux reveal a surprising change in sign over 2 years lead time. Surface cooling leads to the expected initial local decrease in stratification. However, there is a delayed response to surface cooling leading to an increase in stratification. This delayed response in stratification involves ... Dataset Southern Ocean Zenodo Southern Ocean |
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Open Polar |
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Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
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Adjoint ECCOv4r2 MITgcm |
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Adjoint ECCOv4r2 MITgcm Pimm, Ciara Data for 'Surface heat fluxes drive a two-phase response in Southern Ocean mode water stratification' |
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Adjoint ECCOv4r2 MITgcm |
description |
The files contained here are the output/sensitivity files of four adjoint sensitivity experiments in ECCOv4r2 that are combined to create the sensitivity of large-scale stratification to surface heat flux. (-f/Delta z) * (-alpha * (ADJqnet_t1 - ADJqnet_t2) + beta * (ADJqnet_s1 - ADJqnet_s2)) (Equation 7 in paper, where C = net heat flux). The files contained here are the output/sensitivity files for 6 years at 14 day time steps. ADJqnet_t1: (d J_1(theta_u)/ d qnet), Sensitivity of potential temperature over the upper depths to net heat flux. ADJqnet_t2: (d J_2(theta_l)/ d qnet), Sensitivity of potential temperature over the lower depths to net heat flux. ADJqnet_s1: (d J_3(salt_u)/ d qnet), Sensitivity of salinity over the upper depths to net heat flux. ADJqnet_s2: (d J_4(salt_l)/ d qnet), Sensitivity of salinity over the lower depths to net heat flux. Paper Abstract: Subantarctic mode waters (SAMW) have low stratification and are formed through subduction from thick winter mixed layers in the Southern Ocean. To investigate how external forcing affects the stratification in mode water formation regions in the Southern Ocean, we conduct a set of adjoint sensitivity experiments. The objective function is the annual-average stratification over the mode water formation region, which is evaluated from potential temperature and salinity adjoint sensitivity experiments. The analysis of impacts, from the product of sensitivities and forcing variability, identifies the separate effects of the wind stress, heat flux, and freshwater flux, revealing that the dominant control on stratification is from surface heat fluxes, as well as a smaller effect from zonal wind stress. The adjoint sensitivities of stratification to surface heat flux reveal a surprising change in sign over 2 years lead time. Surface cooling leads to the expected initial local decrease in stratification. However, there is a delayed response to surface cooling leading to an increase in stratification. This delayed response in stratification involves ... |
format |
Dataset |
author |
Pimm, Ciara |
author_facet |
Pimm, Ciara |
author_sort |
Pimm, Ciara |
title |
Data for 'Surface heat fluxes drive a two-phase response in Southern Ocean mode water stratification' |
title_short |
Data for 'Surface heat fluxes drive a two-phase response in Southern Ocean mode water stratification' |
title_full |
Data for 'Surface heat fluxes drive a two-phase response in Southern Ocean mode water stratification' |
title_fullStr |
Data for 'Surface heat fluxes drive a two-phase response in Southern Ocean mode water stratification' |
title_full_unstemmed |
Data for 'Surface heat fluxes drive a two-phase response in Southern Ocean mode water stratification' |
title_sort |
data for 'surface heat fluxes drive a two-phase response in southern ocean mode water stratification' |
publishDate |
2023 |
url |
https://zenodo.org/record/8160115 https://doi.org/10.5281/zenodo.8160115 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
doi:10.5281/zenodo.8160114 https://zenodo.org/record/8160115 https://doi.org/10.5281/zenodo.8160115 oai:zenodo.org:8160115 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.816011510.5281/zenodo.8160114 |
_version_ |
1778533773031243776 |