Source code for pycif.plugins.obsparsers.icos.utils

# -*- coding: utf-8 -*-

import os
import pandas as pd
import numpy as np
from dateutil.tz import tzoffset




def convert_unit(df, params, unit="ppm", default_unit="ppm"):
    """Converts between ppb, ppm, ppt. Default is conversion to ppm

    """

    if "unit" in df.columns:
        for p in params:
            # Change missing unit to default unit
            df.loc[df["unit"] == "", "unit"] = default_unit

            # First conversion to ppm as a common reference unit
            df.loc[df["unit"] == "ppt", p] /= 1e6
            df.loc[df["unit"] == "ppb", p] /= 1e3
            df.loc[df["unit"] == "ppbv", p] /= 1e3
            df.loc[df["unit"] == "nmol.mol-1", p] /= 1e3
            df.loc[df["unit"] == "nmol.mol-¹", p] /= 1e3

            # Then conversion to target unit if needed
            if unit in ["ppb", "ppbv", "nmol.mol-1", "nmol.mol-¹"]:
                df[p] *= 1e3
            elif unit == "ppt":
                df[p] *= 1e6
            elif unit in ["ppm", "umol.mol-1", "umol.mol-¹"]:
                pass
            else:
                raise ValueError(unit + " is not a valid unit for conversion")

    df["unit"] = unit

    return df