Title: Integrated Development Toolbox for Aquatic Chemical Model
Author: Andreas F. Hofmann, Karline Soetaert, Filip J.R. Meysman,
Imports: minpack.lm, graphics, grDevices, stats
Description: Toolbox for the experimental aquatic chemist, focused on
acidification and CO2 air-water exchange. It contains all elements to
model the pH, the related CO2 air-water exchange, and
aquatic acid-base chemistry for an arbitrary marine,
estuarine or freshwater system. It contains a suite of tools for
sensitivity analysis, visualisation, modelling of chemical batches,
and can be used to build dynamic models of aquatic systems.
As from version 1.0-4, it also contains functions to calculate

Package: AquaEnv
Version: 1.0
Date: 2010-03-01
Title: AquaEnv - an integrated development toolbox for aquatic chemical
model generation
Author: Andreas F. Hofmann, Karline Soetaert, Filip J.R. Meysman
Maintainer: Andreas F. Hofmann <a.hofmann@nioo.knaw.nl>
Depends: minpack.lm, deSolve
Description: AquaEnv is an integrated development toolbox for aquatic
chemical model generation focused on (ocean) acidification and
CO2 air-water exchange. It contains all elements necessary to
model the pH, the related CO2 air-water exchange, as well as
aquatic acid-base chemistry in general for an arbitrary marine,
estuarine or freshwater system. Also chemical batches can be
modelled. Next to the routines necessary to calculate desired
information, AquaEnv also contains a suite of tools to
visualize this information. Furthermore, AquaEnv can not only
be used to build dynamic models of aquatic systems, but it can
also serve as a simple desktop tool for the experimental
aquatic chemist to generate and visualize all possible derived
information from a set of measurements with one single easy to
use R function. Additionally, the sensitivity of the system to
variations in the input variables can be visualized.
License: GPL (>= 2)
LazyData: yes
Packaged: Mon Mar 1 14:20:57 2010; orlando
Repository: CRAN
Date/Publication: 2010-03-02 11:42:57

Title: Rigorous Data Reduction and Error Propagation of '40Ar/39Ar'
Authors@R: person("Pieter", "Vermeesch", , "p.vermeesch@ucl.ac.uk", role = c("aut", "cre"))
Description: Processes noble gas mass spectrometer data to determine the isotopic composition of argon (comprised of 36Ar, 37Ar, 38Ar, 39Ar and 40Ar) released from neutron-irradiated potassium-bearing minerals. Then uses these compositions to calculate precise and accurate geochronological ages for multiple samples as well as the covariances between them. Error propagation is done in matrix form, which jointly treats all samples and all isotopes simultaneously at every step of the data reduction process. The package includes methods for regression of the time-resolved mass spectrometer signals to t=0 ('time zero') for both single- and multi-collector instruments, blank correction, mass fractionation correction, detector intercalibration, decay corrections, interference corrections, interpolation of the irradiation parameter between neutron fluence monitors, and (weighted mean) age calculation. All operations are performed on the logs of the ratios between the different argon isotopes so as to properly treat them as 'compositional data', sensu Aitchison [1986, The Statistics of Compositional Data, Chapman and Hall].