Abstract
Ocean processes that can influence rapidly changing ocean color include water-mass movement and bio-optical property changes in the water parcel. Traditionally, diurnal variability of bio-optical properties relies on daily time series at fixed locations by satellite sensors or in situ observations. There is a lack of an effective way to observe diurnal variation of bio-optical properties in a moving water parcel on a large scale. In this paper, we propose a new method to acquire diurnal variation of bio-optical properties in a moving water parcel. The novel approach integrates drifting buoy data and GOCI data. The movement of surface current was tracked by a drifting buoy, and its spatiotemporally matching bio-optical properties were obtained via the GOCI data. The results in the Yellow and East China seas during the summers of 2012 and 2013 show that the variation of time series following the movement of water parcel was obviously different from that obtained at fixed locations. The hourly differences of the former are 15.7% and 16.3% smaller than those of the latter for Chl a and total suspended sediment (TSS), respectively. The value of ag440 was more stable within the moving water parcel than in the fixed location. Our approach provides a simple and feasible way for observing diurnal variability of bio-optical properties in a moving surface water parcel.
Highlights
Understanding the dynamics of bio-optical properties in coastal systems and marginal seas is important for marine ecological environment monitoring
To examine the diurnal variation of bio-optical properties of the current, we developed a new approach to explore the trajectory of a moving water parcel and its changing bio-optical properties by combining the information of drifting buoys and GOCI observations
We developed a novel approach to observe diurnal variation of biooptical properties in the moving surface water parcel, which tracks the movement of surface currents using drifting buoys, and combines its spatiotemporally matched biooptical properties with the retrieval from the GOCI
Summary
Understanding the dynamics of bio-optical properties in coastal systems and marginal seas is important for marine ecological environment monitoring. The variability of in-water bio-optical properties has been shown to be associated with specific environmental and biological conditions [1,2]. The bio-optical properties of water mass change along with the growth and decay of phytoplankton blooms, upwelling and downwelling, particle settling, and resuspension events [4,5]. These ocean processes can influence rapidly changing ocean color on the order of hours in different regions. Biological, photochemical, and biogeochemical processes are regulated by the variation in solar radiation
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