Model Resolution Sensitivity of the Simulation of North Atlantic Oscillation Teleconnections to Precipitation Extremes
We evaluate a high-resolution (0.25°), four-member ensemble simulation of the global climate (1979–2005) with the U.S. Department of Energy's Energy Exascale Earth System Model v0.3—forced with observed ocean surface temperatures and sea ice extent—for its ability to represent the North Atlanti...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | http://www.osti.gov/servlets/purl/1497961 https://www.osti.gov/biblio/1497961 https://doi.org/10.1029/2018JD028594 |
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ftosti:oai:osti.gov:1497961 2023-07-30T04:05:22+02:00 Model Resolution Sensitivity of the Simulation of North Atlantic Oscillation Teleconnections to Precipitation Extremes Mahajan, Salil Evans, Katherine J. Branstetter, Marcia L. Tang, Qi 2022-03-31 application/pdf http://www.osti.gov/servlets/purl/1497961 https://www.osti.gov/biblio/1497961 https://doi.org/10.1029/2018JD028594 unknown http://www.osti.gov/servlets/purl/1497961 https://www.osti.gov/biblio/1497961 https://doi.org/10.1029/2018JD028594 doi:10.1029/2018JD028594 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1029/2018JD028594 2023-07-11T09:31:44Z We evaluate a high-resolution (0.25°), four-member ensemble simulation of the global climate (1979–2005) with the U.S. Department of Energy's Energy Exascale Earth System Model v0.3—forced with observed ocean surface temperatures and sea ice extent—for its ability to represent the North Atlantic Oscillation (NAO) teleconnections to winter precipitation extremes over western Europe. As compared to the low-resolution model (1°), it simulates a stronger impact of NAO on daily precipitation extremes over the western slopes of mountain ranges over southwestern Norway, northwestern United Kingdom, and the Western Balkan states. Precipitation extremes and their linear relationship with NAO are quantified using the generalized extreme value distribution. NAO-dependent large-scale (stratiform) precipitation intensity strengthens in the high-resolution model on seasonal time scales and plays a dominant role during simulated daily precipitation extremes. Improvements in the high-resolution model over these varied-topography regions largely appear to be due to finer resolved scales of motion that amplify NAO-dependent seasonal vertical moisture fluxes and enhance stable condensation. However, the high-resolution model simulates a weaker than observed impact of NAO on extratropical cyclone activity and total precipitable water, generally underperforming the low-resolution model These effects possibly offset the impact of enhanced vertical moisture fluxes on NAO-dependent precipitation extremes in the high-resolution model in these regions. Over the southwestern Iberian peninsula, the high-resolution model underperforms the low-resolution model simulating weaker than observed impact of NAO on precipitation extremes. Finally, this appears to be due to the reduction in total precipitable water despite an increase in NAO-dependent extratropical activity there. Other/Unknown Material North Atlantic North Atlantic oscillation Sea ice SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Norway Journal of Geophysical Research: Atmospheres 123 20 11,392 11,409 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Mahajan, Salil Evans, Katherine J. Branstetter, Marcia L. Tang, Qi Model Resolution Sensitivity of the Simulation of North Atlantic Oscillation Teleconnections to Precipitation Extremes |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
We evaluate a high-resolution (0.25°), four-member ensemble simulation of the global climate (1979–2005) with the U.S. Department of Energy's Energy Exascale Earth System Model v0.3—forced with observed ocean surface temperatures and sea ice extent—for its ability to represent the North Atlantic Oscillation (NAO) teleconnections to winter precipitation extremes over western Europe. As compared to the low-resolution model (1°), it simulates a stronger impact of NAO on daily precipitation extremes over the western slopes of mountain ranges over southwestern Norway, northwestern United Kingdom, and the Western Balkan states. Precipitation extremes and their linear relationship with NAO are quantified using the generalized extreme value distribution. NAO-dependent large-scale (stratiform) precipitation intensity strengthens in the high-resolution model on seasonal time scales and plays a dominant role during simulated daily precipitation extremes. Improvements in the high-resolution model over these varied-topography regions largely appear to be due to finer resolved scales of motion that amplify NAO-dependent seasonal vertical moisture fluxes and enhance stable condensation. However, the high-resolution model simulates a weaker than observed impact of NAO on extratropical cyclone activity and total precipitable water, generally underperforming the low-resolution model These effects possibly offset the impact of enhanced vertical moisture fluxes on NAO-dependent precipitation extremes in the high-resolution model in these regions. Over the southwestern Iberian peninsula, the high-resolution model underperforms the low-resolution model simulating weaker than observed impact of NAO on precipitation extremes. Finally, this appears to be due to the reduction in total precipitable water despite an increase in NAO-dependent extratropical activity there. |
author |
Mahajan, Salil Evans, Katherine J. Branstetter, Marcia L. Tang, Qi |
author_facet |
Mahajan, Salil Evans, Katherine J. Branstetter, Marcia L. Tang, Qi |
author_sort |
Mahajan, Salil |
title |
Model Resolution Sensitivity of the Simulation of North Atlantic Oscillation Teleconnections to Precipitation Extremes |
title_short |
Model Resolution Sensitivity of the Simulation of North Atlantic Oscillation Teleconnections to Precipitation Extremes |
title_full |
Model Resolution Sensitivity of the Simulation of North Atlantic Oscillation Teleconnections to Precipitation Extremes |
title_fullStr |
Model Resolution Sensitivity of the Simulation of North Atlantic Oscillation Teleconnections to Precipitation Extremes |
title_full_unstemmed |
Model Resolution Sensitivity of the Simulation of North Atlantic Oscillation Teleconnections to Precipitation Extremes |
title_sort |
model resolution sensitivity of the simulation of north atlantic oscillation teleconnections to precipitation extremes |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1497961 https://www.osti.gov/biblio/1497961 https://doi.org/10.1029/2018JD028594 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
North Atlantic North Atlantic oscillation Sea ice |
op_relation |
http://www.osti.gov/servlets/purl/1497961 https://www.osti.gov/biblio/1497961 https://doi.org/10.1029/2018JD028594 doi:10.1029/2018JD028594 |
op_doi |
https://doi.org/10.1029/2018JD028594 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
123 |
container_issue |
20 |
container_start_page |
11,392 |
op_container_end_page |
11,409 |
_version_ |
1772817218308931584 |