Identification

Title

Evaluation of the HOMME dynamical core in the aqua-planet configuration of NCAR CAM4: Rainfall

Abstract

The NCAR-Community Climate System Model version 4 (CCSM4) includes a new dynamical core option based on NCAR's High-Order Method Modeling Environment (HOMME). HOMME is a petascale capable high-order element-based conservative dynamical core developed on the cubed-sphere grid. Initial simulations have been completed in aqua-planet configuration of CAM4, the atmospheric component of CCSM4. We examined the results of this simulation and assessed its fidelity in simulating rainfall, which is one of the most important components of the Earth's climate system. For this we compared the results from two other dynamical cores of CAM4, the finite volume (FV) and Eulerian (EUL). Instantaneous features of rainfall in HOMME are similar to FV and EUL. Similar to EUL and FV, HOMME simulates a single peak Inter Tropical Convergence Zone (ITCZ) over the equator. The strength of the ITCZ is found to be almost same in HOMME and EUL but more than that in FV. It is observed that in HOMME and EUL there is higher surface evaporation, which supplies more amount of moisture into the deep tropics and gives more rainfall over the ITCZ. The altitude of maximum precipitation is found to be at almost the same level in all the three dynamical cores. The eastward propagation of rainfall bands is organized in FV and HOMME, and more prominent than in EUL. The phase speed of the eastward propagation in HOMME is found to be higher than that in FV. Our results show that, in general, the rainfall simulated by HOMME falls in a regime between that of FV and EUL. Hence, we conclude that the key aspects of rainfall simulation with HOMME falls in an acceptable range, as compared to the existing dynamical cores used in the model.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.org/ark:/85065/d7028t34

codeSpace

Dataset language

eng

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Classification of spatial data and services

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geoscientificInformation

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Text

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title

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reference date

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publication

effective date

2016-01-01T00:00:00Z

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publication

effective date

2011-08-01T00:00:00Z

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Copyright 2011 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.

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Responsible organisations

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contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

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pointOfContact

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