Conversion Sequences

Below are unit conversions of often needed flux variables.

The individual steps are given so we can spot any errors more easily.

Please use at your own risk, always double-check.

CO2

umol CO2 m-2 s-1 → g CO2 m-2 30min-1

Example

1. Half-hourly flux results from EddyPro show CO2 uptake: -20 umol CO2 m-2 s-1
2. The total amount of CO2 uptake in this half-hour is calculated by applying the total gain: -20 * 0.0792171
3. In this half-hour, the CO2 uptake was: -1.584342‬ g CO2 m-2 30min-1
4. Simplified, the CO2 uptake over 30 minutes was 1.6 g m-2

umol CO2 m-2 s-1 → g C m-2 30min-1

Example

1. Half-hourly flux results from EddyPro show CO2 uptake: -20 umol CO2 m-2 s-1
2. The total amount of carbon uptake in this half-hour is calculated by applying the total gain: -20 * 0.02161926
3. In this half-hour, the carbon uptake was: ‭-0.4323852‬‬ g C m-2 30min-1
4. Simplified, the carbon uptake over 30 minutes was 0.4 g m-2

N2O

nmol N2O m-2 s-1 → kg N2O-N2 ha-1 30min-1

Total gain: 0.00050424109632

umol N2O m-2 s-1 → g N2O m-2 30min-1

Example

1. 1. Half-hourly flux results from EddyPro show N2O emission: 0.005 umol N2O m-2 s-1
   2. The total amount of N2O uptake in this half-hour is calculated by applying the total gain: 0.005 * ‭0.07922304‬
   3. In this half-hour, the N2O emission was: ‭0.0003961152‬‬‬ g N2O m-2 30min-1
   4. Simplified, the N2O emission over 30 minutes was 0.4 mg m-2

nmol N2O m-2 s-1 → g N2O m-2 30min-1

Example

1. Half-hourly flux results from EddyPro show N2O emission: 5 nmol N2O m-2 s-1
2. The total amount of N2O uptake in this half-hour is calculated by applying the total gain: 5 * ‭‭0.00007922304‬
3. In this half-hour, the N2O emission was: ‭0.0003961152‬‬‬‬ g N2O m-2 30min-1
4. Simplified, the N2O emission over 30 minutes was 0.4 mg m-2

CH4

• molecular weight CH4: 16.0425
• molecular weight C: 12.011
• molecular weight H: 1.00784

umol CH4 m-2 s-1 → g CH4 m-2 30min-1

nmol CH4 m-2 s-1 → kg CH4-C ha-1 30min-1

Last Updated on 15 Apr 2025 12:31