The Ecosystems Center, MBL

MBL GEM Download Page

This page contains the latest version of the Marine Biological Laboratory’s General Ecosystem Model (MBL GEM).  The model is written in Borland Delphi for IBM PC compatibles.

The files located on this page are self-extracting compressed files for IBM compatible computers.  To uncompress the files, download the file into an empty directory and double click on the downloaded file.  All files will be extracted to the current directory.

Unless explicitly stated otherwise, parameter files created in one version of the model are not compatible with another version. 


Acceptable Use Policy


The software provided on this page has been tested under the Windows operating system.  However, its stability under all conditions cannot be guaranteed.  The user assumes all risk for its use.
Downloading and using the software requires that:

  • The Principal Investigator is sent a notice stating the model version downloaded.
  • The user regularly checks this web site for updated software.
  • The Principal Investigator of the model be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.

A copy of any resultant publications should be sent to:

Edward Rastetter
Ecosystems Center
Marine Biological Laboratory
Woods Hole, MA 02543

Versions Available for Download

  • MBL GEM Version 6.4.4.5

    Daily GEM with vegomatic

    Updated 27 May 2005

    Modified fonts, etc so that windows and dialogs size properly on laptops and other aesthetic changes.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv6445.exe

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.4.4.3

    Daily GEM with vegomatic

    Updated 28 February 2005

    Parameter files created in version 6.4.4.1 should be compatible with this version but the user should check the model output to make sure..

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv6443.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.4.4.1

    Daily GEM

    Updated 20 May 2003

    Added annual respiration for each tissue, humus C:N and active soil C. Corrected bugs in the append to output file option.

    Parameter files created in gemv644 are not compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv6441.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.4.4

    Daily GEM

    Updated 15 May 2003

    Added annual NPP for each tissue. Added the ability to append to the output file.

    Parameter files created in gemv6433 are not compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares Stringgrid version 2.8.8.0

    File: compressed mblgemv644.EXE

    Relavent Citations:

    Unpublished

    MBL GEM Version 6.4.3.3

    Daily GEM

    Updated 2 April 2003

    Corrected calculation of heartwood litter when heartwood is zero.

    Parameter files created in gemv6432 are compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv6433.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.4.3.2

    Daily GEM

    Updated 24 March 2003

    Corrected initialization of three cumulative processes.

    Parameter files created in gemv6431 are compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv6432.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.4.3.1

    Daily GEM

    Updated 18 March 2003

    Changed the allocation equations.  Updated the Et equations.  Fixed some minor bugs in modelshell.

    Parameter files created in gemv642 are not compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv6431.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.4.2

    Daily GEM

    Updated 16 December 2002

    Added ability to modify parameters from within the chart, to automatically show chart, to run the model to steady state, to change the output offset, and to output the end of the run results only.

    Parameter files created in gemv641 are compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv642.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.4.1

    Daily GEM

    Updated 3 December 2002

    Changed transport, growth and litterfall equations to improve model stability.

    Parameter files created in earlier versions are not compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv641.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.3.1

    Daily GEM

    Updated 2 October 2002

    Corrected 7 October 2002

    Gem v6.3.0 with correction to N fixation equation

    Parameter files created in earlier versions are not compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv631.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 6.3.0

    Daily GEM

    Updated 6 June 2002

    Daily model that includes simplified allocation and growth models, inhibition of C and N uptake and N fixation.  Updated the root growth response and corrected litterfall partitioning equations.

    Parameter files created in earlier versions are not compatible with this version.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: compressed mblgemv630.EXE

    Relavent Citations:

    Unpublished

     

    MBL GEM Version 3.3.6.5.d

    Annual GEM using ACM as photosynthesis submodel. Includes code for hillslope calculations.

    Parameter files created in earlier versions are not compatible with this version.

    Contains: MBL GEM windows executable, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    File: compressed mblgemv3365d.exe

    Relavent Citations:

    Rastetter et al., 2004

     

    MBL GEM Version 3.3.6.5.b

    Annual GEM using ACM as photosynthesis submodel

    Parameter files created in earlier versions are not compatible with this version.

    Contains: MBL GEM windows executable, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    File: compressed mblgemv3365b.exe

    Relavent Citations:

    Le Dizès et al., 2003

     

    Soil Water Model

    Updated 15 September, 2000

    The AGET model is a daily soil water model currently under development. This version of AGET includes daily submodels of decomposition and photosynthesis.

    Contains: MBL GEM program, source code, sample parameter files and driver files and Word documentation.

    Created in:

    Delphi 5, update 1

    Uses TMS Softwares TAdvstringgrid version

    File: SoilWater.zip

    Relavent Citations:

    Unpublished

     


    This material is based upon work supported by the National Science Foundation under grants #OPP-9318529, OPP-9732281, DEB-9509613, and DEB-0108960 and the Environmental Protection Agency under grants RFQ-RT-00-00107 and QT-RT-00-001667.  Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation or the Environmental Protection Agency.

     

    Last Updated: November 8, 2005 BK