Extended Data Fig. 3: Relationships between emissions and regional mean concentrations. | Nature Geoscience

Extended Data Fig. 3: Relationships between emissions and regional mean concentrations.

From: Regime shift in secondary inorganic aerosol formation and nitrogen deposition in the rural United States

Extended Data Fig. 3

Panels (a–c) present the orthogonal distance regression slopes of (a) SO2 emission-\({c}_{{{\rm{SO}}}_{4}^{2-}}\), (b) NOx emissions-\({c}_{{{\rm{NO}}}_{3}^{{\rm{T}}}}\), and (c) NH3 emission-\({c}_{{{\rm{NH}}}_{4}^{{\rm{T}}}}\) regressions for 2011–2015, 2016–2020, and 2011–2020 with observations from long-term sites only. Regional mean concentrations are used in the regressions, and the sample sizes for each region are 5, 5, and 10 for 2011–2015, 2016–2020, and 2011–2020, respectively. ‘*’ or ‘**’ indicate the regression has a p < 0.05 or <0.01, respectively. The error bars show uncertainties of the regression slopes (95% CI; calculated as ±1.96 standard deviation (SD)). The numbers below are the slopes (mean values), the uncertainties (±1.96 SD), and the Pearson correlation coefficients, respectively. To illustrate NH3-\({c}_{{{\rm{NH}}}_{4}^{{\rm{T}}}}\) correlation results for 2011–2015 in panel (c), they are scaled by 1/6.

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