- AMER SOC LIMNOLOGY OCEANOGRAPHY
We studied daily, diurnal, and seasonal variations in triple oxygen isotopes in the Sagami Bay from May to October 2002. The variations in composition of triple oxygen isotopes are in association with changes in concentrations of dissolved oxygen (DO) and chlorophyll a (Chl a). The lowest (17)Delta anomaly (excess 110) was found during October and the highest in August. There was a prominent subsurface (17)Delta anomaly maximum during June and August because of photosynthesis below the mixed layer and reduced gas exchange. The (17)Delta anomaly was positively correlated with DO and Chl a, but with large scatter. The gross oxygen production (GOP) computed on the basis of triple oxygen isotopes is almost double the value given by the standard oxygen incubation method. This could possibly be because of inability to measure O-2 uptake rates in the light bottle and the consequent assumption that respiration is the same in light and dark bottles. GOP measured by a fast repetition rate fluorometer showed large daily variability, whereas GOP given by the (17)Delta anomaly is within daily variability. This suggests that the (17)Delta anomaly method measures average GOP over the residence time of DO in the mixed layer.
Web of Science ® 被引用回数 : 38
Web of Science ® の 関連論文(Related Records®)ビュー