Fig. 6From: High-resolution mapping and time-series measurements of 222Rn concentrations and biogeochemical properties related to submarine groundwater discharge along the coast of Obama Bay, a semi-enclosed sea in JapanLine plots of 222Rn (dpm/L) and chlorophyll-a (μg/L) in a March, b June, c July, and d September, observed by monitoring the coastline from a boat. Letters A to D in c and d correspond to those in Fig. 1b Back to article page