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Overview

The aqua-planet

OpenIFS includes a number of idealised configurations. In this article we explain how to configure the model for an 'aqua-planet' simulation. An aqua-planet is one that includes no topography and no land. It's a highly simplified representation of Earth but useful for a number of studies.

 

Info
titleFurther information

The aquaplanet configuration (enabled by namelist variable LAQUA) is based on the Neale & Hoskins publications:

  • Neale, R. B. and Hoskins B. J., 2000a, A standard test for AGCMs and their physical parameterizations. I: The proposal, Atmos. Sci. Letters, 1, pp. 101-107, DOI: 10.1006/asle.2000.0022
  • Neale, R. B. and Hoskins, B. J., 2000b, A standard test for AGCMs and their physical parameterizations. II: Results for The Met. Office Model, Atmos. Sci. Letters, 1, pp. 108-114, DOI: 10.1006/asle.2000.0024

More recent publications on the aqua-planet:

  • Medeiros, B., et al,2008, Aquaplanets, climate sensitivity, and low clouds. Journal of Climate, DOI: 10.1175/2008JCLI1995.1
  • Blackburn, M., et al. (2013) The Aqua-Planet Experiment (APE): CONTROL SST Simulation. Journal of the Meteorological Society of Japan, 91A. pp. 17-56. ISSN 2186-9057 doi: 10.2151/jmsj.2013-A02

  • Blackburn, M. and Hoskins, B. J. (2013) Context and aims of the Aqua-Planet Experiment. Journal of the Meteorological Society of Japan, 91A. pp. 1-15. ISSN 2186-9057 doi: 10.2151/jmsj.2013-A01

See also for example, the PCMDI Aqua-Planet website.

Info

Please note that aqua-planet and other idealized configurations are a research tool and therefore may change between model versions.

For further assistance with idealised configurations of OpenIFS, please contact: openifs-support@ecmwf.int.

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Table of Contents

Code changes

There is a small error in OpenIFS version 38r1 in the code that sets the SST for the 3KW1 case of Neale & Hoskins. This code incorrectly sets the latitudinal width to 30o instead of 60o. This error is corrected in later versions of OpenIFS.

Expand the box below for details of the necessary code changes.

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titleExpand to see required code changes...

The required code changes are small.

In the file: src/ifs/phys_ec/gp_sstaqua.F90, find the lines 233:238:

Code Block
        ! 3KW1
        RCHI=3.0_JPRB
        IF( ABS(PGEMU(IOFF+JROF-1)) <= SIN(RPHID) ) THEN
          PSD_VF(JROF,YSD_VF%YSST%MP,IBL)=PSD_VF(JROF,YSD_VF%YSST%MP,IBL)+&
           &RCHI*COS(PGELAM(IOFF+JROF-1)-RLAMBDA0)*&
           &COS(0.5_JPRB*ZPI*(ASIN(PGEMU(IOFF+JROF-1))/RPHID))**2

The use of RPHID needs to be corrected to 60o:

Code Block
        ! 3KW1
        RCHI=3.0_JPRB
        IF( ABS(PGEMU(IOFF+JROF-1)) <= SIN(2._JPRB*RPHID) ) THEN                   !  correct use of RPHID on this line
          PSD_VF(JROF,YSD_VF%YSST%MP,IBL)=PSD_VF(JROF,YSD_VF%YSST%MP,IBL)+&
           &RCHI*COS(PGELAM(IOFF+JROF-1)-RLAMBDA0)*&
           &COS(0.5_JPRB*ZPI*(ASIN(PGEMU(IOFF+JROF-1))/(2._JPRB*RPHID)))**2        !  correct use of RPHID on this line

 

Configuration

Configuring OpenIFS for an aqua-planet simulation requires appropriate changes to:

...