Fig. 2: Histogram of annual GPP trends for 1991–2020 at four grid cells. | npj Climate and Atmospheric Science

Fig. 2: Histogram of annual GPP trends for 1991–2020 at four grid cells.

From: When is a trend meaningful? Insights to carbon cycle variability from an initial-condition large ensemble

Fig. 2

Grid cells correspond to the location of core terrestrial sites for four domains in the National Ecological Observatory Network (NEON). See Fig. 1 for the location of the sites. Panels show a D01: Northeast, b D19: Taiga, c D02: Mid-Atlantic, and d D09: Northern Plains sites. The left axis is the frequency distribution for the n = 50 ensemble members, and the black line is the cumulative distribution (right axis). Yellow shading shows members with a statistically significant trend (n = 30 years; p ≤ 0.05), and light blue shading shows non-significant trends. The mean ± standard deviation and the percentage of members with a non-significant (n.s.) trend are provided in the upper left of each panel. Also shown is the 95% confidence interval (red circles) obtained as the range of trends (n = 48) after excluding the smallest and largest trends.

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