Biogeochemical Argo (BGC-Argo) floats are autonomous marine observing platforms that monitor chlorophyll-a and other indicators of ocean ecosystem health globally. Since 2018, there has been an increase in the number of chlorophyll-a observations in the northwest Pacific due to the deployment of BGC-Argo floats. Such progress offers an unprecedented opportunity to develop a skillful operational ocean biogeochemical model. Here...

Tokyo Bay is surrounded by a growing urban metropolis and has experienced varying levels of water quality over time. Vertical profiles of nutrients and chlorophyll a (Chl a ) were obtained monthly from 1989 to 2015 at two sampling stations located in the center of Tokyo Bay. From 2006 to 2015, profiles of dissolved organic nitrogen (DON) and phosphorus were also obtained. Mann–Kendall trend analysis was used to establish the s...

The dry mass of zooplankton and backscatter from an acoustic Doppler current profiler (ADCP) used in Sagami Bay, Japan, from 9 to 13 April 2005 were well correlated (correlation coefficient = 0.72, root mean square dry weight = 2.5 mg m −3 ). The horizontal current field and zooplankton distribution were estimated from shipboard ADCP data. Although sea surface temperature and chlorophyll a concentration observed by satellite w...