def photorespiration_rate(gross_canopy_photosynthesis_rate, stomata_co2_concentration, co2_compensation_point):
    """
    Equations 9.13
    photorespiration_rate = gross_canopy_photosynthesis_rate * CO2_compensation_point / stomata_CO2_concentration
    Args:
        gross_canopy_photosynthesis_rate:
        stomata_co2_concentration:
        co2_compensation_point:
    Returns: photorespiration rate [µmol {CO2} m^-2 s^-1]
    """
    return gross_canopy_photosynthesis_rate * co2_compensation_point / stomata_co2_concentration