Data related to Earth’s atmosphere, including air quality, GHG fluxes from land, historical weather patterns, and climate model outputs.

atmosphere

Atmosphere

forest

Colin Stief

### Overview  
  
Net forest carbon flux represents the net exchange of carbon between forests and the atmosphere between 2001 and 2020, calculated as the balance between carbon emitted by forests and removed by (or sequestered by) forests during the model period (megagrams CO2e ha-1). Net carbon flux is calculated by subtracting average annual gross removals from average annual gross emissions in each modeled pixel; negative values are where forests were net sinks of carbon and positive values are where forests were net sources of carbon between 2001 and 2020. Net fluxes are calculated following IPCC Guidelines for national greenhouse gas inventories in each pixel where forests existed in 2000 or were established between 2000 and 2012 according to the Global Forest Change tree cover change data of Hansen et al. (2013). This layer reflects the cumulative net flux during the model period (2001-2020) and must be divided by 19 to obtain average annual net flux; net flux values cannot be assigned to individual years of the model.  
  
  

This net flux layer is part of the forest carbon flux model described in Harris et al. (2021). This paper introduces a geospatial monitoring framework for estimating global forest carbon fluxes which can assist governments and non-government actors with tracking greenhouse gas fluxes from forests and decreasing emissions or increasing removals by forests. All input layers were resampled to a common resolution of 0.00025 x 0.00025 degrees each to match Hansen et al. (2013).  
  
  

Net flux is available for download in two different area units over the model duration: 1) megagrams of CO2e ha-1, and 2) megagrams of CO2e pixel-1. The first is appropriate for visualizing (mapping) net flux because it represent the density of carbon fluxes per hectare. The second is appropriate for calculating the net flux in an area of interest (AOI) because the values of the pixels in the AOI can be summed to obtain the total carbon flux for that area. The values in the latter were calculated by adjusting the net flux per hectare by the size of each pixel, which varies by latitude. When estimating net flux occurring over a defined number of years between 2001 and 2020, divide the provided values by the model duration and then multiply by the number of years in the period of interest.

Global Forest Watch

Forest Greenhouse Gas Net Flux

Net Forest Carbon Flux (tCO₂e ha⁻¹)