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Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

From: δ 18Osw estimate for Globigerinoides ruber from core-top sediments in the East China Sea

Fig. 4

δ 18Osw–salinity plot of shallow seawaters in the ECS. δ 18Osw–salinity plot of all shallow seawater (0–100 m) data in this study (early July 2013). The data are classified into four site groups: Yellow Sea–ECS shelf, Kuroshio, Okinawa Trough, and off-Kyushu sites (Table 1). The black regression line is derived from the data in the Yellow Sea–ECS shelf and Kuroshio sites. Since the surface waters in the northern Okinawa Trough are a mixture of the CDW and Kuroshio surface water, δ 18Osw and salinity data from northern Okinawa Trough sites fall on this regression line. Regression lines (dotted lines) and equations from the literature are also shown. Regression lines III, IV, and V were developed in mainly coastal and shelf waters near the Changjiang Estuary. Although these regression lines represent freshwater end-members that are similar to our regression line, the end-member of the seawater shows lower δ 18Osw values than that of the Kuroshio surface water (34.2 and 0.13 ‰; SSW14–17)

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