Persistent ocean anomalies as a response to Northern Hemisphere heating induced by biomass burning variability
Biomass burning aerosol (BBA) emissions in the Coupled Model Intercomparison Project phase 6 (CMIP6) historical forcing fields have enhanced temporal variability during the years 1997-2014 compared to earlier peri-ods. Recent studies document that the corresponding inhomogeneous shortwave forcing ov...
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Online Access: | https://doi.org/10.1175/JCLI-D-23-0090.1 |
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ftncar:oai:drupal-site.org:articles_26818 2024-06-23T07:55:13+00:00 Persistent ocean anomalies as a response to Northern Hemisphere heating induced by biomass burning variability Yamaguchi, Ryohei (author) Kim, Ji-Eun (author) Rodgers, Keith B. (author) Stein, Karl (author) Timmermann, Axel (author) Lee, Sun-Seon (author) Huang, Lei (author) Stuecker, Malte F. (author) Fasullo, John T. (author) Danabasoglu, Gokhan (author) Deser, Clara (author) Lamarque, Jean-Francois (author) Rosenbloom, Nan A. (author) Edwards, Jim (author) 2023-12-01 https://doi.org/10.1175/JCLI-D-23-0090.1 en eng Journal of Climate--0894-8755--1520-0442 articles:26818 doi:10.1175/JCLI-D-23-0090.1 ark:/85065/d7jw8jz8 Copyright 2023 American Meteorological Society (AMS). article Text 2023 ftncar https://doi.org/10.1175/JCLI-D-23-0090.1 2024-05-27T14:15:41Z Biomass burning aerosol (BBA) emissions in the Coupled Model Intercomparison Project phase 6 (CMIP6) historical forcing fields have enhanced temporal variability during the years 1997-2014 compared to earlier peri-ods. Recent studies document that the corresponding inhomogeneous shortwave forcing over this period can cause changes in clouds, permafrost, and soil moisture, which contribute to a net terrestrial Northern Hemisphere warming relative to earlier periods. Here, we investigate the ocean response to the hemispherically asymmetric warming, using a 100-member ensemble of the Community Earth System Model version 2 Large Ensemble forced by two different BBA emissions (CMIP6 default and temporally smoothed over 1990-2020). Differences between the two subensemble means show that ocean temperature anomalies occur during periods of high BBA variability and subsequently persist over multiple decades. In the North Atlantic, surface warming is efficiently compensated for by decreased northward oceanic heat transport due to a slowdown of the Atlantic meridional overturning circulation. In the North Pacific, surface warming is compensated for by an anomalous cross-equatorial cell (CEC) that reduces northward oceanic heat transport. The heat that converges in the South Pacific through the anomalous CEC is shunted into the subsurface and contributes to formation of long-lasting ocean temperature anomalies. The anomalous CEC is maintained through latitude-dependent contributions from narrow western boundary currents and basinwide near-surface Ekman transport. These results indicate that interannual variability in forcing fields may significantly change the background climate state over long time scales, presenting a potential uncer-tainty in CMIP6-class climate projections forced without interannual variability. 1852977 1947282 DE-SC0022070 Article in Journal/Newspaper North Atlantic permafrost OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Pacific Journal of Climate 36 23 8225 8241 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Biomass burning aerosol (BBA) emissions in the Coupled Model Intercomparison Project phase 6 (CMIP6) historical forcing fields have enhanced temporal variability during the years 1997-2014 compared to earlier peri-ods. Recent studies document that the corresponding inhomogeneous shortwave forcing over this period can cause changes in clouds, permafrost, and soil moisture, which contribute to a net terrestrial Northern Hemisphere warming relative to earlier periods. Here, we investigate the ocean response to the hemispherically asymmetric warming, using a 100-member ensemble of the Community Earth System Model version 2 Large Ensemble forced by two different BBA emissions (CMIP6 default and temporally smoothed over 1990-2020). Differences between the two subensemble means show that ocean temperature anomalies occur during periods of high BBA variability and subsequently persist over multiple decades. In the North Atlantic, surface warming is efficiently compensated for by decreased northward oceanic heat transport due to a slowdown of the Atlantic meridional overturning circulation. In the North Pacific, surface warming is compensated for by an anomalous cross-equatorial cell (CEC) that reduces northward oceanic heat transport. The heat that converges in the South Pacific through the anomalous CEC is shunted into the subsurface and contributes to formation of long-lasting ocean temperature anomalies. The anomalous CEC is maintained through latitude-dependent contributions from narrow western boundary currents and basinwide near-surface Ekman transport. These results indicate that interannual variability in forcing fields may significantly change the background climate state over long time scales, presenting a potential uncer-tainty in CMIP6-class climate projections forced without interannual variability. 1852977 1947282 DE-SC0022070 |
author2 |
Yamaguchi, Ryohei (author) Kim, Ji-Eun (author) Rodgers, Keith B. (author) Stein, Karl (author) Timmermann, Axel (author) Lee, Sun-Seon (author) Huang, Lei (author) Stuecker, Malte F. (author) Fasullo, John T. (author) Danabasoglu, Gokhan (author) Deser, Clara (author) Lamarque, Jean-Francois (author) Rosenbloom, Nan A. (author) Edwards, Jim (author) |
format |
Article in Journal/Newspaper |
title |
Persistent ocean anomalies as a response to Northern Hemisphere heating induced by biomass burning variability |
spellingShingle |
Persistent ocean anomalies as a response to Northern Hemisphere heating induced by biomass burning variability |
title_short |
Persistent ocean anomalies as a response to Northern Hemisphere heating induced by biomass burning variability |
title_full |
Persistent ocean anomalies as a response to Northern Hemisphere heating induced by biomass burning variability |
title_fullStr |
Persistent ocean anomalies as a response to Northern Hemisphere heating induced by biomass burning variability |
title_full_unstemmed |
Persistent ocean anomalies as a response to Northern Hemisphere heating induced by biomass burning variability |
title_sort |
persistent ocean anomalies as a response to northern hemisphere heating induced by biomass burning variability |
publishDate |
2023 |
url |
https://doi.org/10.1175/JCLI-D-23-0090.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic permafrost |
genre_facet |
North Atlantic permafrost |
op_relation |
Journal of Climate--0894-8755--1520-0442 articles:26818 doi:10.1175/JCLI-D-23-0090.1 ark:/85065/d7jw8jz8 |
op_rights |
Copyright 2023 American Meteorological Society (AMS). |
op_doi |
https://doi.org/10.1175/JCLI-D-23-0090.1 |
container_title |
Journal of Climate |
container_volume |
36 |
container_issue |
23 |
container_start_page |
8225 |
op_container_end_page |
8241 |
_version_ |
1802647708505210880 |