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Resolution dependence of extreme precipitation and deep convection over the Gulf Stream

Resolution dependence of extreme precipitation and deep convection over the Gulf Stream
Resolution dependence of extreme precipitation and deep convection over the Gulf Stream
Modeled wintertime precipitation over the Atlantic Gulf Stream region is shown to be sensitive to the horizontal resolution of the driving Global Circulation Model (GCM). By contrasting simulations with the EC-Earth GCM over a range of horizontal resolutions (T159, T319, T799), it is shown that especially the precipitation extremes become more populated if resolution is higher. Higher resolution also appears to strengthen the communication from the sea surface toward the troposphere. With increasing resolution, deep convection over the Gulf Stream region, diagnosed via wind-convergence and vertical motion, occurs more frequently and the former is in better agreement with observations. Likewise the frequency increase of the precipitation extremes over the region for increasing resolution makes them agree better with observations, despite large natural variability and discrepancies between different observational sources.
1942-2466
1186-1194
Scher, Sebastian
6769d761-8016-48a0-b55f-480d9343eec8
Haarsma, Reindert J.
52de705c-7df6-48c6-a891-99c8a01f4b09
De Vries, Hylke
ab19b1d5-679d-49d2-9e75-7fbdc44c31f2
Drijfhout, Sybren S.
a5c76079-179b-490c-93fe-fc0391aacf13
Van Delden, Aarnout J.
0d032079-b44e-4fb5-a0be-fe38eea5c07f
Scher, Sebastian
6769d761-8016-48a0-b55f-480d9343eec8
Haarsma, Reindert J.
52de705c-7df6-48c6-a891-99c8a01f4b09
De Vries, Hylke
ab19b1d5-679d-49d2-9e75-7fbdc44c31f2
Drijfhout, Sybren S.
a5c76079-179b-490c-93fe-fc0391aacf13
Van Delden, Aarnout J.
0d032079-b44e-4fb5-a0be-fe38eea5c07f

Scher, Sebastian, Haarsma, Reindert J., De Vries, Hylke, Drijfhout, Sybren S. and Van Delden, Aarnout J. (2017) Resolution dependence of extreme precipitation and deep convection over the Gulf Stream. Journal of Advances in Modeling Earth Systems, 9 (2), 1186-1194. (doi:10.1002/jame.v9.2).

Record type: Article

Abstract

Modeled wintertime precipitation over the Atlantic Gulf Stream region is shown to be sensitive to the horizontal resolution of the driving Global Circulation Model (GCM). By contrasting simulations with the EC-Earth GCM over a range of horizontal resolutions (T159, T319, T799), it is shown that especially the precipitation extremes become more populated if resolution is higher. Higher resolution also appears to strengthen the communication from the sea surface toward the troposphere. With increasing resolution, deep convection over the Gulf Stream region, diagnosed via wind-convergence and vertical motion, occurs more frequently and the former is in better agreement with observations. Likewise the frequency increase of the precipitation extremes over the region for increasing resolution makes them agree better with observations, despite large natural variability and discrepancies between different observational sources.

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Scher_et_al-2017-Journal_of_Advances_in_Modeling_Earth_Systems - Version of Record
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Accepted/In Press date: 8 May 2017
Published date: 1 June 2017

Identifiers

Local EPrints ID: 413368
URI: http://eprints.soton.ac.uk/id/eprint/413368
ISSN: 1942-2466
PURE UUID: 89ba2771-af3d-4ee3-b933-447ab7341238

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Date deposited: 23 Aug 2017 16:31
Last modified: 23 May 2022 16:57

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Contributors

Author: Sebastian Scher
Author: Reindert J. Haarsma
Author: Hylke De Vries
Author: Aarnout J. Van Delden

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