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This data article refers to the paper entitled “Multi-element signatures in solid and solution phases in a tropical mixing zone: A case study in the Cai River estuary, Vietnam” (Koukina et al., 2021), which considers the fate of major, trace, and rare-earth elements transported through the estuarine geochemical filter of the typical tropical estuary. The present work contributes to the local geochemical baselines as a background for long-term monitoring of potential hazardous elements. Therefore, the dataset covers the abundance, enrichment, and partitioning parameters of 53 chemical elements in the water, suspended particulate matter, and bottom sediment samples collected in the Cai River estuary and the adjacent part of the Nha Trang Bay (South China Sea) between July and August 2013. The total filtered, particulate, and sedimentary elements were determined by atomic emission and inductively coupled plasma mass spectrometry (ICP-AES; ICP-MS). The environmental indices (the enrichment factor and geoaccumulation index) and partition coefficients were calculated from the total element contents. The data provided is essential for the comprehensive environmental assessment of the anthropogenic impact on the coastal ecosystem as well as for the evaluation and modelling of element fractionation and mobility at the estuarine gradients.

A total of 137 water samples to study optical properties of chromophoric dissolved organic matter were collected in the Artic shelf seas during the 69th cruise on board the R/V Akademik Mstislav Keldysh in August–September 2017. Sampling sites were located in the Kara, Laptev and East Siberian seas and associated to the areas influenced by terrestrial runoff of the Kolyma, Indigirka, Lena, Khatanga, Ob and Yenisei rivers. In this data article, conventional spectroscopic indices and lignin phenol concentrations, calculated on the basis of fluorescence and UV–vis absorption spectra, are presented. Keywords: Dissolved organic matter, Fluorescence, Absorbance, Spectroscopic indices, Arctic

Cross-correlation functions of ambient and shipping noise were measured by near-bottom hydrophones in 100 meter-deep water in the Straits of Florida. This paper is based on cross-correlations in the 20-100 Hz frequency band between two hydrophones 5 km apart. The propagation conditions between the hydrophones were nearly range-independent. The noise cross-correlation functions provides an approximation to the deterministic Green's functions, which describes sound propagation in opposite directions between the hydrophones. Using a background sound-speed profile, 44 eigenrays were found and relevant perturbation matrices were calculated for propagation with and against the flow. Modelled Green's function has 10 peaks, which have been matched to the peaks of the cross-correlation function. Sound speed and flow velocity profiles in water have been retrieved by minimizing the mismatch between positions of the modelled and measured peaks. Acoustic frequencies being low, errors in ray-theoretical modeling limit ...