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The Design Document page provides a description of the algorithms, implementation and planned testing including unit, verification, validation and performance testing. Please read  Step 1.3 Performance Expectations that explains feature documentation requirements from the performance group point of view. 

Design Document

 Click here for instructions to fill up the table below ......

The first table in Design Document gives overview of this document, from this info the Design Documents Overview page is automatically created.

In the overview table below 4.Equ means Equations and Algorithms, 5.Ver means Verification, 6.Perf - Performance, 7. Val - Validation

  • Equations: Document the equations that are being solved and describe algorithms
  • Verification Plans: Define tests that will be run to show that implementation is correct and robust. Involve unit tests to cover range of inputs as well as benchmarks.
  • Performance expectations: Explain the expected performance impact from this development
  • Validation Plans: Document what process-based, stand-alone component, and coupled model runs will be performed, and with what metrics will be used to assess validity

Use the symbols below (copy and paste) to indicate if the section is in progress or done or not started.

In the table below 4.Equ means Equations and Algorithms, 5.Ver means Verification, 6.Perf - Performance, 7. Val - Validation,   (tick) - competed, (warning) - in progress, (error) - not done

 

Overview table for the owner and an approver of this feature

1.Description

Improve efficiency of land spinup and offline land model simulations

2.OwnerDaniel Ricciuto
3.Created 
4.Equ(error) choose one of the labels above: competed, in progress, not done/not started
5.Ver(error) choose one of the labels above: competed, in progress, not done/not started
6.Perf(error) choose one of the labels above: competed, in progress, not done/not started
7.Val(error) choose one of the labels above: competed, in progress, not done/not started
8.ApproverPeter Thornton, William Riley (Unlicensed)
9.Approved Date// approved date
 Click here for Table of Contents ...

Table of Contents

 

 

 

Title: Improving the efficiency of land spinup and offline model simulations

Requirements and Design

ACME Land Group

Date:   

Summary

This modification contains 2 major pieces:  1)  Modification of the accelerated decomposition for land model biogeochemistry spinup, and 2) Implementation of "coupler bypass" mode, which loads atmospheric input data directly in the land model.  For 1), acceleration factors now will include a dependence on mean annual temperature, and are directly connected to the rate constant parameters instead of hard-coded constants.  If Q10 or rate constant parameters are varied for UQ efforts, the acceleration factors will also change to maximize efficiency.  All pools with a turnover time of greater than 1 year (depending on the parameter value) will be accelerated, including litter and coarse woody debris (CWD).  Also included is accelerated dead wood mortality, in which dead coarse root and stem mortality is accelerated.  The biomass/height relationship and fire modules are also adjusted in accelerated mode for consistency.  Finally, in accelerated mode, in model years 1-20 (currently hard-coded), carbon-only mode is used (with saturated nitrogen).  This allows much faster spinup of biomass.  For 2), atmospheric data are loaded directly in the lnd_import_export subroutine rather than passed from datm to the coupler.  This option, which improves performance significantly, is implemented as a separate compset using SATM.  Stream files within the land model (ndep, fire data) are also disabled and all data are read on timestep 0 and held in system memory.  This option uses a compressed version of the atmospheric input (QIAN or CRU-NCEP), as well as slightly different interpolation routines, and will not be BFB with the DATM compsets.  Initial testing shows differences in the 1% range for most variables.  These improvements can shorten offline land model simulation times by 5-10x, and are primarily intended for model development and UQ.

Requirements

Requirement: name-of-requirement-here

Date last modified:  
Contributors: Daniel Ricciuto


Each requirement is to be listed under a ”section” heading, as there will be a one-to-one correspondence between requirements, design, proposed imple- mentation and testing. Requirements should not discuss technical software issues, but rather focus on model capability. To the extent possible, require- ments should be relatively independent of each other, thus allowing a clean design solution, implementation and testing plan.

 

Algorithmic Formulations

Design solution: short-description-of-proposed-solution-here

Date last modified:// date
Contributors: (add your name to this list if it does not appear)

 

For each requirement, there is a design solution that is intended to meet that requirement. Design solutions can include detailed technical discussions of PDEs, algorithms, solvers and similar, as well as technical discussion of performance issues. In general, this section should steer away from a detailed discussion of low-level software issues such as variable declarations, interfaces and sequencing.

 

Design and Implementation

Implementation: short-desciption-of-implementation-here

Date last modified: // date
Contributors: (add your name to this list if it does not appear)

 

This section should detail the plan for implementing the design solution for requirement XXX. In general, this section is software-centric with a focus on software implementation. Pseudo code is appropriate in this section. Links to actual source code are appropriate. Project management items, such as svn branches, timelines and staffing are also appropriate. How do we typeset pseudo code?

 

Planned Verification and Unit Testing 

Verification and Unit Testing: short-desciption-of-testing-here

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Contributors: (add your name to this list if it does not appear)

 

How will XXX be tested? i.e. how will be we know when we have met requirement XXX. Will these unit tests be included in the ongoing going forward?

Planned Validation Testing 

Validation Testing: short-desciption-of-testing-here

Date last modified:
Contributors: (add your name to this list if it does not appear)

 

How will XXX be tested? What observational or other dataset will be used?  i.e. how will be we know when we have met requirement XXX. Will these unit tests be included in the ongoing going forward?

Planned Performance Testing 

Performance Testing: short-desciption-of-testing-here

Date last modified:
Contributors: (add your name to this list if it does not appear)

 

How will XXX be tested? i.e. how will be we know when we have met requirement XXX. Will these unit tests be included in the ongoing going forward?

 

 

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