|Introduction - The Flannigan et al. (2009) does not find that boreal regions store 30% of the world's soil carbon pool. Within that paper, they are citing someone else's work "...but store an estimated 30% of the world's soil C pool (Gorham, 1991)." Is this still the estimate? |
Section 2 - The authors must consider that the spatial resolution of burned area data, which is nominally 250 m, means that it will miss small fires. Active fire products, at 1 km or 375 m, are capable of detecting fires 1/10 the size the pixel resolution [see Patricia Oliva and Wilfrid Schroeder, “Assessment of VIIRS 375 m active fire detection product for direct burned area mapping”, Remote Sensing of Environment, vol. 160 (2015), pp. 144–155; Tianran Zhang et al. “Approaches for synergistically exploiting VIIRS I-and M-Band data in regional active fire detection and FRP assessment: A demonstration with respect to agricultural residue burning in Eastern China”, Remote Sensing of Environment, vol. 198 (2017), pp.407–424.] So excluding active fire products excluded smaller fires. Aggregating 250 m to 0.25◦ is also potentially averaging out smaller fires. This should be noted in the discussion of uncertainty, especially given that the official on-the-ground fire occurrence dataset registers all fires regardless of size.
Section 2.1.1 - How many fires are included in Figure 2? This is should be reported in the text and ideally broken down by country.
Figure 3 - What is the spatial resolution of Figure 3? 0.25◦? Were the the Norweigan fire occurrence data aggregated to 0.25◦? Or was a 0.25◦ grid overlaid on the Norweigan dataset? Explaining this a bit more explains why there is so much fire in Figure 3B and basically no fire in Figure 3A.
Section 4.5 - What exactly is the value-added for a data-driven model to predict fire danger probability for actionable management of wildfires? In Figure 8, the months of May, June, July have more detail in the Model Prediction for high fire danger than FWI, but a very similar pattern. Additionally, explain to the reader how this developed could be used for fire season management if using near-real-time data and/or near term climate model outputs. This is not obvious in this section.
Data availability - The authors need to better describe how to access the Norwegian wildfire record at https://www.brannstatistikk.no/. Mention that the site is in Norwegian. How would someone request the data from here? Do you have to be a resident of Norway or a citizen of Norway to request and/or access the data? Is the data allowed to be shared or posted publicly? This is an important data set for the findings of this analysis but how someone would replicate this study by accessing this data is unclear.
References - The following reference is now out of date and the brokered links do not appear anymore at https://climate.esa.int/en/projects/fire/key-documents/:
Pettinari, M., Lizundia-Loiola, J., and Chuvieco, E.: Algorithm Theoretical Basis Document: CDR Fire Burned Area (brokered from CCI Fire
Burned Area), available at: http://datastore.copernicus-climate.eu/documents/satellite-fire-burned-area/D1.6.2-v1.0_ATBD_CDR_BA-FireCCI_MODIS_v5.1cds_PRODUCTS_v1.0.1.pdf, 2019.