Fig. 2. Correlation between water level height (m in NAVD88) and seasonally detrended GPP rate measurements for 2018 (a) and 2019 (b). The color gradient represents the concomitant salinity concentration (ppt). The vertical dotted line indicates the elevation of the marsh soil surface (approximately 1 m). Both detrended GPP rates and water level height are from noon each day during the growing season. Positive GPP rates indicate a higher-than-average GPP rate on that day compared to an average growing season.