Fig. 2: The spatial distribution of four submarine groundwater discharge (SGD) tracers in China’s coastal surface waters.
From: Large scale submarine groundwater discharge dominates nutrient inputs to China’s coast

The four tracers include 222Rn (a), 224Ra (b), 226Ra (c), and 228Ra (d). Source data are provided as a Source Data file in Supplementary Data 1. The maps are generated with Ocean Data View (https://odv.awi.de).