Title: ICON-A, the Atmosphere Component of the ICON Earth System Model: I. Model Description

Abstract

ICON–A is the new icosahedral nonhydrostatic (ICON) atmospheric general circulation model in a configuration using the Max Planck Institute physics package, which originates from the ECHAM6 general circulation model, and has been adapted to account for the changed dynamical core framework. The coupling scheme between dynamics and physics employs a sequential updating by dynamics and physics, and a fixed sequence of the physical processes similar to ECHAM6. To allow a meaningful initial comparison between ICON–A and the established ECHAM6–LR model, a setup with similar, low resolution in terms of number of grid points and levels is chosen. The ICON–A model is tuned on the base of the Atmospheric Model Intercomparison Project (AMIP) experiment aiming primarily at a well balanced top–of atmosphere energy budget to make the model suitable for coupled climate and Earth system modeling. The tuning addresses first the moisture and cloud distribution to achieve the top–of–atmosphere energy balance, followed by the tuning of the parameterized dynamic drag aiming at reduced wind errors in the troposphere. The resulting version of ICON–A has overall biases, which are comparable to those of ECHAM6. Problematic specific biases remain in the vertical distribution of clouds and in the stratospheric circulation, where the wintermore » vortices are too weak. Biases in precipitable water and tropospheric temperature are, however, reduced compared to the ECHAM6. As a result, ICON–A will serve as the basis of further development and as the atmosphere component to the coupled model, ICON–Earth system model (ESM).« less

Authors:

Giorgetta, Marco A.  ^[1];

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Brokopf, R. ^[1]; Crueger, T.  ^[1];

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Esch, M. ^[1]; Fiedler, S.  ^[1];

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Helmert, J. ^[2]; Hohenegger, C.  ^[1];

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Kornblueh, L. ^[1]; Kohler, M. ^[2]; Manzini, E.  ^[1];

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Mauritsen, T.  ^[1];

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Nam, C.  ^[3];

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Raddatz, T. ^[1]; Rast, S. ^[1]; Reinert, D.  ^[2];

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Sakradzija, M.  ^[1];

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Schmidt, H.  ^[4];

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Schneck, R. ^[1]; Schnur, R. ^[1]; Silvers, L.  ^[5]

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more »; Wan, H.  ^[6];

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Zangl, G. ^[2]; Stevens, B.  ^[1]

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+ Show Author Affiliations

1. Max Planck Institute for Meteorology, Hamburg (Germany)
2. Deutscher Wetterdienst, Offenbach (Germany)
3. Max Planck Institute for Meteorology, Hamburg (Germany); Univ. of Leipzig, Leipzig (Germany)
4. Max Planck Institute for Meteorology, Hamburg Germany
5. Princeton Univ., Princeton, NJ (United States)
6. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Publication Date:

2018-06-08

Research Org.:

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1464496

Alternate Identifier(s):

OSTI ID: 1512398

Report Number(s):

PNNL-SA-134716
Journal ID: ISSN 1942-2466; TRN: US1902397

Grant/Contract Number:  

AC05-76RL01830

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Advances in Modeling Earth Systems

Additional Journal Information:

Journal Volume: 10; Journal Issue: 7; Journal ID: ISSN 1942-2466

Publisher:

American Geophysical Union (AGU)

Country of Publication:

United States

Language:

English

Subject:

54 ENVIRONMENTAL SCIENCES; ICON-A; atmospheric GCM; model description; model tuning