co2_add {respirometry}

Calculate CO2 to add to water

Description

Calculates the moles of CO2 gas to be added to a volume of seawater to achieve the desired pCO2. Useful for ocean acidification experiments where CO2 treatments are desired.

Usage

co2_add(
  goal_pco2,
  start_pH,
  vol,
  temp = 25,
  sal = 35,
  TA = NULL,
  atm_pres = 1013.25
)

Arguments

goal_pco2

the desired pCO2 in the water (uatm).

start_pH

pH of the water before CO2 is added (total scale).

vol

volume of the water (liter).

temp

temperature (°C). Default is 25 °C.

sal

salinity (psu). Default is 35 psu. If sal < 26 psu, then TA must be provided.

TA

(optional) total alkalinity (umol / kg). If undefined TA is estimated from salinity using guess_TA.

atm_pres

atmospheric pressure (mbar). Default is 1013.25 mbar.

Value

moles of CO2 gas to be added to the seawater.

Note

It is assumed that all of the CO2 added dissolves and remains in solution. This can be achieved (almost completely) by bubbling CO2 according to Jokiel et al. 2014.

Author(s)

Matthew A. Birk, [e-mail]

References

Jokiel PL, Bahr KD, Rodgers KS. 2014. Low-cost, high-flow mesocosm system for simulating ocean acidification with CO2 gas. Limnol Oceanogr Methods. 12:313–322.

See Also

co2_rate, flush_carb, carb, peri_pump

Examples

# I want the 50 L reservoir to have a pCO2 = 1000 uatm. It currently has a pH of 7.88.
# How many moles of CO2 gas should be added to the water to reach my desired pCO2?
co2_add(goal_pco2 = 1000, start_pH = 7.88, vol = 50)