Parameters defining the planetary boundary for anthropogenic reactive nitrogen and its agri-food-system apportionment, used by the SJOS-N per-capita boundary axis. The low, high and top values bracket the published planetary reactive-nitrogen limit; the per-capita cap, the synthetic-to-total agricultural ratio and the food share of agricultural nitrogen scale that global limit to a comparable per-capita agricultural basis.
Format
A tibble in long form with columns:
- parameter
Parameter name (e.g.
"boundary_low","per_capita_cap","syn_tot_agri_ratio").- value
Numeric parameter value.
- unit
Unit of the value (e.g.
"Tg N/yr","kg N/cap/yr","ratio","fraction").- description
Human-readable description of the parameter.
Source
Planetary reactive-nitrogen boundary literature: de Vries, W., Kros, J., Kroeze, C. & Seitzinger, S. P. (2013). Assessing planetary and regional nitrogen boundaries related to food security and adverse environmental impacts. Current Opinion in Environmental Sustainability, 5(3-4), 392-402. doi:10.1016/j.cosust.2013.07.004 ; Campbell, B. M., Beare, D. J., Bennett, E. M., Hall-Spencer, J. M., Ingram, J. S. I., Jaramillo, F., Ortiz, R., Ramankutty, N., Sayer, J. A. & Shindell, D. (2017). Agriculture production as a major driver of the Earth system exceeding planetary boundaries. Ecology and Society, 22(4):8. doi:10.5751/ES-09595-220408 ; Springmann, M. et al. (2018). Options for keeping the food system within environmental limits. Nature, 562, 519-525. doi:10.1038/s41586-018-0594-0 ; regional agricultural-nitrogen boundaries: Schulte-Uebbing, L. F., Beusen, A. H. W., Bouwman, A. F. & de Vries, W. (2022). From planetary to regional boundaries for agricultural nitrogen pollution. Nature, 610, 507-512. doi:10.1038/s41586-022-05158-2 . The specific low/high/top boundary values, the per-capita cap and the agricultural-apportionment ratios are transcribed from the Global SJOS-N analysis synthesising these sources; verify against Zotero before any manuscript use.
Examples
n_boundary_params
#> # A tibble: 6 × 4
#> parameter value unit description
#> <chr> <dbl> <chr> <chr>
#> 1 boundary_low 60 Tg N/yr Lower estimate of the planetary boundar…
#> 2 boundary_high 125 Tg N/yr Upper estimate of the planetary boundar…
#> 3 boundary_top 205 Tg N/yr Top reactive-N boundary estimate boundi…
#> 4 per_capita_cap 40 kg N/cap/yr Per-capita anthropogenic reactive-nitro…
#> 5 syn_tot_agri_ratio 1.53 ratio Scaling from synthetic to total agricul…
#> 6 food_agri_share 0.95 fraction Food share of agricultural reactive nit…