MBL MEL: Download Page

The Marine Biological Laboratory’s Multiple Element Limitation Model (MBL MEL) was originally written in Borland Delphi for IBM PC compatibles. In 2012 MBL MEL was rewritten in the open source IDE Lazarus. You do not need Delphi or Lazarus to run the MBL MEL model under Microsoft Windows. If you want to make changes to the MBL MEL equations you will need Delphi or Lazarus. Versions of MBL MEL written in Delphi will only run Microsoft Windows. Versions written in Lazarus can be compiled for Microsoft Windows, Apple OS X, or Linux. The Lazarus IDE supports the Linux operating system, MBL MEL should run under Linux but we have not tested it extensively.

Each version of MBL MEL is packaged into a zip file.  The zip file contains the full source code, the MBL MEL Windows executable, and sample parameter and driver files. Before running MBL MEL unzip the files into an empty directory.

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

Acceptable Use Policy

The software provided on this page has been tested under the Windows and OS X operating systems.  However, its stability under all conditions cannot be guaranteed.  The user assumes all risk for its use.

Downloading and using the software requires that:

  1. The Principal Investigator is sent a notice stating the model version downloaded.
  2. The user regularly checks this web site for updated software.
  3. 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.
  4. 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 MEL Version III

Multiple species version with N fixation and DON fluxes, annual time step

Contains: MBL MEL program, source code, sample parameter and driver files Created in: Delphi 5, update 1. Uses TMS Softwares TAdvstringgrid FileMBL MEL III5sp.zip Relevant Citations: Original multiple species version – Herbert et al., 1999; N fixaton – Rastetter et al., 2001; DON losses – Rastetter et al., 2005

MBL MEL Version III.5

Daily MBL MEL with single soil layer

Contains: MBL MEL program, source code, sample parameter and driver files Created in: Delphi 5, update 1. Uses TMS Softwares TAdvstringgrid version v3.4.8.6 File: MBL MEL v3.5.zip (single soil layer) Relevant Citations: None

MBL MEL Version IV.2

Daily MBL MEL with eight resources (Delphi version)

Contains: MBL MEL program, source code, sample parameter and driver files Created in: Delphi 2007. Uses TMS Softwares TAdvstringgrid version 4.5.0.5. File: MBL MEL v4.2.zip Relevant Citations: None
Contains: MBL MEL program, source code, sample parameter and driver files with new Uws. Created in: Delphi 2007. Uses TMS Softwares TAdvstringgrid version 4.5.0.5. File: MBL MEL v4.2.new Uws.zip Relevant Citations: None

MBL MEL Version IV.3

Daily MBL MEL with eight resources (Delphi and Lazarus)

Contains: MBL MEL program, source code, sample parameter and driver files Created in: Delphi 2007. Uses TMS Softwares TAdvstringgrid version 4.5.0.5. File: MBL MEL 4.3.zip Relevant Citations: Rastetter et. al., 2013
Created in:
Modelshell: Lazarus v1.2.4.
Create Equations: Lazarus v1.2.4 plus TRichmemo v1.0
File: MBL MEL 4.3L.zip
(available soon)

MBL MEL Version V

Annual MBL MEL

Contains: MBL MEL program, sample parameter and driver files Created in: Modelshell: Lazarus v1.2.4. Create Equations: Lazarus v1.2.4 plus TRichmemo v1.0 File: MBL MEL 5.0.zip Relevant Citations: Rastetter et al., in prep

This material is based upon work supported by the National Science Foundation under grants #OPP-9318529, OPP-9732281, DEB-9509613, DEB 0716067 (OPUS),  DEB-0108960, ARC-0806329, EF-1065587, ARC-0856853, and DEB-0949420 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: 25 July 2014 BK

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