Katherine A Bouton

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• Katherine A Bouton
• National Centre for Atmospheric Science
• - Climate Programme -
• University of Reading
• June 19, 2006

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What is NMM?

• An evolving framework and international standard,
  built using XML and associated technologies, to
  describe climate numerical models.
• to add value to the climate model data
• to assist in the exchange of information about
  numerical codebases, and the models done using
  them
• to extend and refine the researcher's ability to
  understand how resulting output data was
  produced.

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Intent of NMM

• Primary intent is to add value/provenance to
  model output data.
• Part of a suite of metadata which will completely
  describe the model.
• Not the intent to be able to re-create/re-run a
  model.
• Not the intent to be able to use it as a
  modelling/coupling framework.

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NMM Framework - Codebase
- created once - by developer - automatic
creation from code?
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NMM Framework Model - Application
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NMM Queries and Answers
Query CF compliant data files for dates Returned
source(s) are the NMM Model XML files
What Models have data from 1845 to 1956?
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NMM Queries and Answers
What Models used a tripolar grid ?
Query NMM Model XML Components (NumericalPropertie
s)
Query NMM Model XML Components (NumericalPropertie
s)
Return information about grids with pointer to
gridspec files for more details
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NMM Codebase
Codebase
Component Atmosphere
Component Land
Component Ocean
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Codebase

• One NMM codebase XML file for each codebase
  (could be very large)
• It is written by developers (to output with
  framework?)
• It documents the codebase possibilities/
  potential.

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NMM Model
Model
Component Configuration Atmosphere
Component Configuration Ocean
Component Configuration Land
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NMM Model

• Ideally NMM Model XML file is automatically
  created.
• Scientist decides when to save it. Can save it
  with every configuration if using it in a
  personal notebook scenario or just when data is
  ready to be sent off to a data center.

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Implementing NMM

• Used the NMM to document the IPCC Models at PCMDI
• Created 23 NMM XML files, one for each model
  using PCMDI online documentation/questionnaire
• Used XSL to format/aggregate all into a table

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IPCC Model Coupling Details
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Simulation Intercomparison

• An atmospheric model component, the UK Met.
  Office Unified Model, version 5.5, was used for
  two simulations run at the same resolution, N96
  (135 km) horizontal with 38 levels in the
  vertical, on the same computer and producing the
  same model output.
• In the cloud scheme of the Unified Model, a grid
  point model, fluctuations about the grid box mean
  vapour plus liquid water content are
  parameterised via a probability density function
  with a width specified through the critical
  relative humidity parameter (RHCrit ). The
  selection of the RHCrit parameterization causes
  the cloud scheme to use a 3D diagnosed critical
  relative humidity parameter Simulation A. In
  Simulation B, the RHCrit parameterization scheme
  has not be selected so a 1D level dependent
  constant is used by the model

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Simulation B
Simulation A
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Complete Sweet
A Complete Descriptive Suite
Suite
The Issues and complexity
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• Further information
• http//cgam.nerc.ac.uk/NMM
• Katherine A Bouton
• k.a.bouton_at_reading.ac.uk
• Thank you