Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations
One of the challenges in evaluating and applying atmospheric regional climate models (RCM) is the non-linear behavior of atmospheric processes, which is still not well understood. These non-linearities determine the internal variability in the model. Therefore, an ensemble of RCM simulations with di...
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ftawi:oai:epic.awi.de:37899 2024-09-15T17:51:11+00:00 Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations Nikiema, Oumarou Rinke, Annette Dethloff, Klaus Laprise, Ren`e 2015-04-16 application/pdf https://epic.awi.de/id/eprint/37899/ https://epic.awi.de/id/eprint/37899/1/EGU_2015_Poster.pdf https://hdl.handle.net/10013/epic.45498 https://hdl.handle.net/10013/epic.45498.d001 unknown https://epic.awi.de/id/eprint/37899/1/EGU_2015_Poster.pdf https://hdl.handle.net/10013/epic.45498.d001 Nikiema, O. , Rinke, A. orcid:0000-0002-6685-9219 , Dethloff, K. and Laprise, R. (2015) Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations , European Geosciences Union (EGU) 2015, Vienna, 12 April 2015 - 17 April 2015 . hdl:10013/epic.45498 EPIC3European Geosciences Union (EGU) 2015, Vienna, 2015-04-12-2015-04-17 Conference notRev 2015 ftawi 2024-06-24T04:12:21Z One of the challenges in evaluating and applying atmospheric regional climate models (RCM) is the non-linear behavior of atmospheric processes, which is still not well understood. These non-linearities determine the internal variability in the model. Therefore, an ensemble of RCM simulations with different initial atmospheric conditions has been run and a diabatic budget study for potential temperature (Nikiema et al. 2010) has been applied to investigate the origin of internally generated variability. Hence, the physical processes associated with diabatic and dynamical terms inducing the inter-member variability have been analyzed. The study is carried out for the Arctic applying an ensemble of 20 members, differing in their initial conditions only, simulated with the RCM HIRHAM5 during summer (July- September) 2012. This time period is of particular importance because of the melting sea ice and its influence on atmospheric circulation and the resulting effect on the inter-member variability. The model is driven by the Era-Interim data set and runs with a spatial resolution of 25 km. The amplitude of the inter-member variability of the HIRHAM5 ensemble simulations fluctuates both temporally and spatially. The spatial distribution reveals two centers of high inter-member variability, over the Laptev Sea and over the Beaufort Sea/North America. The inter-member variability is generated/reduced by horizontal/vertical baroclinicity terms, which fluctuates in time like the inter-member variability. The maximum inter-member variability is associated with the great Arctic cyclone event during the beginning of August 2012. Conference Object Arctic Beaufort Sea laptev Laptev Sea Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
One of the challenges in evaluating and applying atmospheric regional climate models (RCM) is the non-linear behavior of atmospheric processes, which is still not well understood. These non-linearities determine the internal variability in the model. Therefore, an ensemble of RCM simulations with different initial atmospheric conditions has been run and a diabatic budget study for potential temperature (Nikiema et al. 2010) has been applied to investigate the origin of internally generated variability. Hence, the physical processes associated with diabatic and dynamical terms inducing the inter-member variability have been analyzed. The study is carried out for the Arctic applying an ensemble of 20 members, differing in their initial conditions only, simulated with the RCM HIRHAM5 during summer (July- September) 2012. This time period is of particular importance because of the melting sea ice and its influence on atmospheric circulation and the resulting effect on the inter-member variability. The model is driven by the Era-Interim data set and runs with a spatial resolution of 25 km. The amplitude of the inter-member variability of the HIRHAM5 ensemble simulations fluctuates both temporally and spatially. The spatial distribution reveals two centers of high inter-member variability, over the Laptev Sea and over the Beaufort Sea/North America. The inter-member variability is generated/reduced by horizontal/vertical baroclinicity terms, which fluctuates in time like the inter-member variability. The maximum inter-member variability is associated with the great Arctic cyclone event during the beginning of August 2012. |
format |
Conference Object |
author |
Nikiema, Oumarou Rinke, Annette Dethloff, Klaus Laprise, Ren`e |
spellingShingle |
Nikiema, Oumarou Rinke, Annette Dethloff, Klaus Laprise, Ren`e Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations |
author_facet |
Nikiema, Oumarou Rinke, Annette Dethloff, Klaus Laprise, Ren`e |
author_sort |
Nikiema, Oumarou |
title |
Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations |
title_short |
Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations |
title_full |
Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations |
title_fullStr |
Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations |
title_full_unstemmed |
Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations |
title_sort |
arctic budget study of inter-member variability using hirham5 ensemble simulations |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/37899/ https://epic.awi.de/id/eprint/37899/1/EGU_2015_Poster.pdf https://hdl.handle.net/10013/epic.45498 https://hdl.handle.net/10013/epic.45498.d001 |
genre |
Arctic Beaufort Sea laptev Laptev Sea Sea ice |
genre_facet |
Arctic Beaufort Sea laptev Laptev Sea Sea ice |
op_source |
EPIC3European Geosciences Union (EGU) 2015, Vienna, 2015-04-12-2015-04-17 |
op_relation |
https://epic.awi.de/id/eprint/37899/1/EGU_2015_Poster.pdf https://hdl.handle.net/10013/epic.45498.d001 Nikiema, O. , Rinke, A. orcid:0000-0002-6685-9219 , Dethloff, K. and Laprise, R. (2015) Arctic Budget Study of Inter-member Variability using HIRHAM5 Ensemble Simulations , European Geosciences Union (EGU) 2015, Vienna, 12 April 2015 - 17 April 2015 . hdl:10013/epic.45498 |
_version_ |
1810293022465720320 |