According to the California Air Resources Board, in 2016 (the most recent year for which figures appear to available) California's total greenhouse gas emissions were 430 million metric tons CO2 equivalent, of which 83% were actual CO2.
In view of a record-breaking string of wildfires in California this year, I am wondering how significant the emission of greenhouse gases from such fires is, but I am having trouble finding relevant data on the internet. What I did find is a chart of daily CO2 emissions during large wildfires earlier this year, which appears to indicate up to an additional 1.5 million metric tons of CO2 emitted per day.
This suggests that in 2018, the total amount of CO2 emitted by wildfires in California might be in the 40 to 50 million metric ton range, or a sizeable portion of California's overall greenhouse gas emissions at around 10 percent. However, this is just a back-of-the-envelope guesstimate (my assumption: 40 to 50 days of major wildfires, at one million metric tons of CO2 equivalent per day), which may be completely flawed.
Are there any reliable (or at minimum, more carefully reasoned) estimates for CO2 emissions from California wildfires, in metric tons per annum? Useful numbers would be estimates for 2018, some other recent year, or for an average year.