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README.md

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 # Carbon-Export
 The biogeochemical model that couples the cycling of phosphorus, carbon, and oxygen is used to obtain global scale organic carbon export flux. 
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+driver.m is the main driver
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+neglogpost.m computes the negative of the logarithm of the posterior pdf for the parameters conditioned on the DIP, DIC, ALK, DOC, and O2 data.
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+uptake_C.m computes the rate of uptake of DIC given the DIP uptake as well as the 1st and 2nd derivatives w.r.t. the model parameters
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+eqPcycle.m computes the equilibrium state of the P-cycle model as well as the 1st and 2nd derivaties of the equilibrium solution w.r.t. the model parameters
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+eqCcycle.m computes the equilibrium of the C-cycle model state as well as the 1st and 2nd derivative of the solution w.r.t the model parameters
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+eqOcycle.m computes the equilibrium of the O-cycle model state as well as the 1st and 2nd derivative of the solution w.r.t the model parameters
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+Fsea2air.m computes the air-sea gas exchange for CO2 and O2.
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+PackPar.m Organize the tunable parameters and assign each parameter an index
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+PrintPar.m Print the parameters to a log file at each iteration
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+ResetPar.m Reset a parameter if the optmization routine suggests it a strange value. This function is only used in the first 10 iteration, after that the choice of parameters is solely based on the data.
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+SetPar.m Assign initial values to parameters
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+SetUp.m Setup the environment and load supporting data.
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+buildPFD.m build the particle flux divergence operator.
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+build_co2syspar.m build the parameters for the co2 system.
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+mkO2P build the oxygen to phosphorus uptake ratio.
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+mkPIC2P.m build the PIC to POC production ratio.
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+unitlity scripts:
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+nsnew.m C.T. Kelly's Newton Armijo solver
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+mfactor.m Timothy A. Davis' LINFACTOR VERSION 1.1.0, Nov 1, 2007 Copyright 2007, Timothy A. Davis, University of Florida
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+d0.m makes a sparse diagonal matrix given a 3d field
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+CO2SYS.m Lewis, E., and D. W. R. Wallace. 1998. Program Developed for CO2 System Calculations. ORNL/CDIAC-105. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tennessee.
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