About the Carbon Maps

 

What the maps show

The maps show where land cover sinks are across Connecticut, over time. A carbon coefficient was applied to each land cover class. The coefficient is a combination of carbon sequestration values combining above ground, below ground, soil and dead matter. Each value was carefully determined. Land cover, and therefore carbon stock maps, exist for 1985, 1990, 1995, 2002, 2006 and 2010. See these single date carbon stock maps as well as the 1985 to 2010 change (increase and decrease in carbon sequestration potential) map, here.

The maps show carbon stock. The darker the red, the higher the carbon sequestration. The highest areas are forested. The closer to white, the lower the carbon sequestration potential. Water, barren and developed are the lowest.

Land conversion happens over time. Because of the 6-date time series ranging from 1985 to 2010, the maps show how the land conversion changes the ability to sequester carbon. To see change, toggle between the different dates, or take a look at the change map.

 

How the maps were created

Carbon Stock Maps

Carbon stock values in MgC per hectare. Numbers from the results of research conducted by Linda Tomasso.

 
Class Name
Carbon above
Carbon below
Carbon soil
Carbon dead
Carbon Total*
1 Developed 0.20 0.59 33.00 0.00 33.79
2 Turf & Grass 0.90 9.11 110.00 0.00 120.01
3 Other Grasses 0.33 0.89 80.52 0.20 81.94
4 Agricultural Field 5.20 0.89 60.00 1.70 67.79
5 Deciduous Forest* 109.80 50.50 78.50 31.40 270.20
6 Coniferous Forest* 95.40 43.90 52.60 31.10 223.00
7 Water 0.00 0.00 0.00 0.00 0.00
8 Non-forested Wetland 35.24 9.18 99.91 0.00 144.33
9 Forested Wetland 49.28 12.83 99.91 20.05 182.07
10 Tidal Wetland 1.30 1.30 240.00 0.70 243.30
11 Barren 0.00 0.33 0.33 0.00 0.66
12 Utility (Forest) 71.80 42.20 65.50 21.90 206.40

 

Land cover maps consist of pixels. Each pixel belongs to one of the land cover classes. To create the carbon maps, each land cover pixels was reassigned a numeric value based not on class, but on carbon stock value. The pixel values in the map thus represent MgC per square hectare. To get to this, the carbon stock value was multiplied by 0.0929 (conversion from 10,000 square feet in a pixel hectare) for a scale range of 25.1 to 0.

 

Carbon Stock Change Maps

The change maps use the 1985 land cover and the 2010 land cover. After the pixels were reassigned based on MgC per square hectare (explained above), they were subtracted in order to have a change in MgC per hectare value. The change value is visible on the change map. Values range from 0 (no change) to 25.1 MgC per hectare.