Velocity and density data in the Gulf of Mexico and North Atlantic from 2017-05-02 to 2019-04-05 measured by Electro-Magnetic Autonomous Profiling Explorer (EM-APEX) floats deployed during R/V Walton Smith cruise WS17121

This is a dataset of three-dimensional simultaneous direct measurements of both physical and biochemical properties and processes throughout the water column (from the sea surface to 1200 m, occasionally extending as deep as 2000 m), from Electro-Magnetic Autonomous Profiling Explorer (EM-APEX) floats deployed during R/V Walton Smith cruise WS17121. The targeted area of the ballasted float deployments lies between the DeSoto Canyon and the northern extent of the Loop Current in the eastern Gulf of Mexico. The EM-APEX profiling float is equipped with CTD and electromagnetic current sensors and also measures the following biochemical properties: dissolved oxygen (DO), chlorophyll fluorescence as proxy for phytoplankton abundance, backscatter as proxy of particle concentration (including marine particles and oil droplets), and colored dissolved organic matter (CDOM) fluorescence as proxy of CDOM (including fluorophoric oil components). Floats were deployed in May 2017 and transmitted data for nearly two years.本数据集源自R/V Walton Smith号科考航次WS17121中部署的电磁自主剖面探测浮标（Electro-Magnetic Autonomous Profiling Explorer, EM-APEX），可对整个水柱（从海面至1200米，偶尔可深至2000米）内的物理与生化特性及过程开展三维同步直接观测。本次压载浮标部署的目标区域位于墨西哥湾东部的德索托峡谷（DeSoto Canyon）与环流经流（Loop Current）北部边界之间。EM-APEX剖面浮标配备了温盐深传感器（Conductivity-Temperature-Depth, CTD）与电磁海流传感器，同时可测量以下生化特性：溶解氧（dissolved oxygen, DO）、作为浮游植物丰度替代指标的叶绿素荧光、作为颗粒物浓度（包括海洋颗粒物与油滴）替代指标的后向散射信号，以及作为有色溶解有机物（colored dissolved organic matter, CDOM）替代指标的有色溶解有机物荧光（含发荧光的油类组分）。该批浮标于2017年5月完成部署，累计传输数据时长近2年。