Table 2.
Datasets used for the analysis.
| Datasets | Spatial resolution | Spatial coverage | Temporal resolution | Temporal coverage | Type of N deposition quantified/modeled |
|---|---|---|---|---|---|
| N deposition maps | |||||
| ACCMIP10 | 0.5° × 0.5° (55.5 × 55.5 km) | Global | Annual | 1850–2100 | Dry and wet deposition of NHy and Nox |
| Wang et al.18–20 | 1.25° × 2.5° (~138 × 277.5 km) | Global | Annual | 1850, 1960, 1970, 1980, 1990, 1997–2013 | Total N deposition |
| Cropland maps | |||||
| LUH221 | 0.25° × 0.25° (~27.7 × 27.7 km) | Global | Annual | 850–2100 | |
| HYDE3.222 | 5′ × 5′ (0.0833 × 0.08333 ~9 × 9 km) | Global | Annual | 1960, 1970, 1980, 1990, 2000–2017 | |
| Station networks | |||||
| UK ECN65 | 4 stations | Country | Daily | 1992–2015 | Wet deposition of NHy, NOx and total N |
| USA NADP66 | 357 stations | Country | Annual | 1978–2019 | Wet deposition of NHy, NOx and total N |
| China67 | 268 stations | Country | Annual | 1980–2018 | Bulk N deposition (annual NH4–N plus NO3–N input from precipitation) |
| EANET37 East Asia | 7 stations | Country | Annual | 2000–2020 | Wet and dry bulk N deposition |
| N emission maps | |||||
| EDGAR27 | 0.1° × 0.1° (~11.1 × 11.1 km) | Global | Annual | 1970–2018 | Total emissions of NOx and NH3 |
Note: ACCMIP: Atmospheric Chemistry and Climate Model Intercomparison Project; LUH2: Land-Use Harmonization 2; HYDE: History of the Global Environment database; UK: United Kingdom; ECN: Environmental Change Network; USA: United States of America; NADP: National Atmospheric Deposition Program; EANET: Acid Deposition Monitoring Network in East Asia; EDGAR: Emissions Database for Global Atmospheric Research.