New version of seacarb R package available

The R package seacarb calculates parameters of the seawater carbonate system and includes functions useful for ocean acidification research. There was a major update of seacarb with its version 3.2.6. It is an important update with major contributions from Jim Orr, Jean-Marie Epitalon and Mathilde Hagens. You are urged to use this version, or even better more recent versions (currently v3.2.10) rather than any of the earlier ones. Support from the Ocean Acidification International Coordination Centre was critical for this update.

seacarb has had major additions since it was last mentioned on this news stream. The new functions are listed below. The seacarb ChangeLog provides more details.

• New: ‘errors’ function estimates uncertainties in computed carbonate system variables by propagating uncertainty in six input variables (after Orr et al., in press, Marine Chemistry).
• New: ‘derivnum’ function returns numerical derivatives of the seawater carbonate system output variables with respect to input variables (after Orr et al., in press, Marine Chemistry).
• New: ‘buffesm’ function, which returns the six buffer factors of the seawater carbonate system as defined by Egleston, Sabine and Morel (2010), has been improved to account for effects of total dissolved inorganic phosphorus (Pt) and silicon (Sit) on buffer factors and the Revelle factor (after Orr et al., in press, Marine Chemistry).
• New: ‘carbfull’, an extension of the carb function. Returns parameters of the seawater carbonate system, including the ammonium and sulfide acid-base systems, as well as full acid-base speciation. This function has not been tested extensively.
• New: ‘buffgen’ which returns the buffer factors of the seawater carbonate system as defined by Hagens and Middelburg (2016), the proton concentration buffer factor (beta.H of Hofmann et al, 2010) as well as the classic Revelle factor. This function has not been tested very extensively.
• Update: ‘bor’, added the formulation of Kulinski et al. (2018) to calculate the total boron concentration.
• New: ‘K2si’ to calculate the second dissociation constant of Si(OH)4.
• New: added support of the Thermodynamic Equation of Seawater 2010 (TEOS–10) in function ‘carb’.
• New ‘eos2teos_chem’ function: Converts in situ temperature to conservative temperature and practical to absolute salinity based on inputs of total alkalinity as well as the concentrations of dissolved inorganic carbon, nitrate, and silicate
• New ‘eos2teos_geo’ function: Converts in situ temperature to conservative temperature and practical to absolute salinity based only on depth and geographic location.
• New ‘teos2eos_chem’ function: Converts conservative temperature to in situ temperature and absolute salinity to practical salinity based on inputs of total alkalinity as well as on the concentrations of dissolved inorganic carbon, nitrate and silicate.
• New ‘teos2eos_geo’ function: Converts conservative temperature to in situ temperature and absolute salinity to practical salinity based only on depth and geographic location.
• New ‘sa2sp_chem’ function: Converts from absolute to practical salinity based on inputs of total alkalinity as well as the concentrations of dissolved inorganic carbon, nitrate and silicate
• New ‘sa2sp_geo’ function: Converts from absolute (SA) to practical salinity (SP) based only on depth and geographic location.
• New ‘sp2sa_chem’ function: Converts from practical to absolute salinity based on inputs of total alkalinity as well as on the concentrations of dissolved inorganic carbon, nitrate and silicate.
• New ‘sp2sa_geo’ function: Converts from practical to absolute salinity based only on depth and geographic location

Gattuso J.-P., Epitalon J.-M., Lavigne H. & Orr J., 2018. seacarb: seawater carbonate chemistry. R package version 3.2.10.

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