Document ID: chunk:federal_register_of_legislation:F2021L01696:clause:2_53
Version: federal_register_of_legislation:F2021L01696
Segment Type: clause
Provision Reference: sch 2 cl 53
Character Range: 233051–234589

53  Change in soil organic carbon stock in the CEA with a specified probability of exceedance for a reporting period
  Work out the change in soil organic carbon stock for a CEA for a reporting period between the first estimation event and a subsequent estimation event for the reporting period associated with a specified probability of exceedance (the ), in tonnes of soil organic carbon, using the following equation:
  equation 116

  where:
 is the value for , for the CEA for the reporting period, in tonnes of soil organic carbon, worked out using equation 113.
 is the value for SE for the CEA given by equation 114.
 is the value of the quantile function (inverse distribution function) for the t-distribution with the value for alpha () set out in the Supplement and with the value for the degrees of freedom  worked out using equation 115.
Note: An alpha () value of 0.4 would give a 60% probability of exceedance.

             is equal to:
 (a) if the calculation occurs for the first and second estimation events for the CEA—0.25;

            Note: The 0.25 multiplier is a temporary discount to the creditable amount of change in soil organic carbon stock due to the use of only 2 estimation events (the effect of climatic influences relative to management-induced changes is assumed to be less influential after three carbon stock estimations and the discount no longer applies). After 3 or more estimations, credits withheld due to the discount will be returned if carbon increases are maintained.
 (b) otherwise—zero.