These maps are from a recent paper by JF Lapierre et al. that compared the factors that control lake CO2 at the continental scale. He found that the spatial patterns in lake pCO2 driver‐response relationships translated into the formation of spatial clusters of pCO2 “regulation” that are shown in map (e) even though there is little apparent regional pattern in pCO2 itself (shown in (d)).
The above figure legend reproduced here:
“The spatially varying relationships of (a) Color, (b) alkalinity, and (c) Chl a with pCO2 in U.S. lakes. Colored dots on Figures a–c represent significant relationship between the proxy and pCO2 based on geographically weighted regressions. Colors indicate classes of t values (slope of the regression divided by standard error of the estimate), with red denoting a positive effect, blue denoting a negative effect, and white denoting no statistically significant effect on pCO2. Despite an absence of spatial pattern in (d) pCO2, the spatial patterns in lake pCO2 driver‐response relationships translated into the formation of (e) spatial clusters of pCO2 “regulation.” Clusters include lakes with comparable response of pCO2 to Chl a, Color, and tAlk (see Table ). Note that the map displays the boundary of U.S. territories, not just the land area.”