pyghgaq 0.1.1

A package to calculate GHG emissions from aquatic ecosystems

PyGHGaq

This package contains different methods and properties to estimate GHG (CH₄ and CO₂) emissions and concentrations for aquatic ecosystems

Implemented methods:

• Flux through the water-air interface
• Gas transfer coefficient (k₆₀₀) using different models:
  • MacIntyre et al. 2010 (positive bouyancy, negative bouyancy and mixed).
  • Cole and Caraco 1998.
  • Vachon and Prairie 2013.
• Calculations to transfor k₆₀₀ to k_gas and viceversa.
• Schmidt number.
• Henry's coefficient corrected by temperature and salt.
• Saturation concentration in water.

Installation

pip install pyghgaq

Usage

import pyghgaq
import numpy as np

temp = np.random.random(30)
u = np.random.random(30)
cw = np.random.random(30)
cgas = np.random.random(30)
hcpch4 = pyghgaq.henry_coefficient("CH4", temp_c=temp)
k600_ms = pyghgaq.k600("VP2013", u10_ms=1, area_km2=1)
kgas_ms = pyghgaq.k600_to_kx("CO2", temp, k600_ms, u)
co2flux = pyghgaq.atm_diff_flux(cgas, cw, kgas_ms)

Units

Units are managed using Pint. They can be changed by default for all the package as

    from pyghgaq.functions.units import DEFAULT_INPUT_UNITS

    DEFAULT_INPUT_UNITS["WindSpeed"] = "m/s"
    DEFAULT_INPUT_UNITS["kgas"] = "m/d"

or by function as:

    atmf = pyg.atm_diff_flux(0, 1, 2, units={"kgas": "m/s"})

IMPORTANT

This package is still under delvelopment