BGC-Argo profiling float WMO 6990684: derived physical, biogeochemical and bio-optical products

This dataset provides products derived from 0-1000 m profiles acquired by the autonomous BGC-Argo float WMO 6990684 (National Research Council- CNR, Institute of Marine Sciences – ISMAR) across the Tyrrhenean Sea (Mediterranean Sea), since July 2025. This float is equipped with a set of sensors for measuring essential ocean, climate and biodiversity variables.
The dataset of derived products contains, for each profile acquired by the BGC-Argo float from 0 to 1000-m depth, a NetCDF file containing the following quantities:

- Potential density: the potential density is computed from the quality-controlled pressure, temperature and salinity profiles through the Gibbs-SeaWater (GSW) Oceanographic Toolbox which contains the TEOS-10 subroutines for evaluating the thermodynamic properties of seawater, according to McDougall and Barker (2011; ISBN 978-0-646-55621-5).
- Mixed layer depth: estimated according to Weller and Plueddemann 1996 (doi:10.1029/96JC00206).
- Particulate Organic Carbon (POC) concentrations: POC is computed from quality-controlled optical particulate backscattering measurements at the wavelength of 700 nm and quality-controlled chlorophyll-a concentration according to Koestner et al. (2022, doi:10.3389/fmars.2022.941950).
- Euphotic depth is defined as the depth at which photosynthetically available radiation (PAR) decreases to 1% of its value just below the sea surface, following Kirk (1994, doi:10.1017/CBO9780511623370). Prior to estimating the euphotic depth, PAR profiles are computed by integrating spectral downwelling irradiance signals over the 400–700 nm range. Each PAR profile is then quality-controlled in real time using the algorithm described by La Forgia and Organelli (2025, doi:10.1002/lom3.10701), and corrected for cloud and wave focusing effects according to Organelli et al. (2016, doi:10.1175/JTECH-D-15-0193.1).

The dataset of derived products is continuously updated in near-real-time as soon as new profiles are available.

This dataset was derived from data collected and made freely available by the International Argo Program and the national programs that contribute to it (https://argo.ucsd.edu, https://www.ocean-ops.org). The Argo Program is part of the Global Ocean Observing System.

本数据集源自2025年7月起，由意大利国家研究委员会（CNR）海洋科学研究所（ISMAR）的自主式生物地球化学Argo（BGC-Argo）浮标WMO 6990684，在第勒尼安海（Tyrrhenean Sea，地中海）获取的0-1000米深度剖面数据。该浮标配备了一套用于测量关键海洋、气候与生物多样性变量的传感器。
针对该BGC-Argo浮标获取的每一条0至1000米深度剖面，衍生产品数据集包含承载如下参数的网络通用数据格式（NetCDF）文件：
- 位势密度：位势密度通过经过质量控制的压力、温度与盐度剖面，利用Gibbs-SeaWater（GSW）海洋学工具箱计算得到，该工具箱包含用于评估海水热力学性质的TEOS-10子程序，依据McDougall与Barker（2011；ISBN 978-0-646-55621-5）的标准。
- 混合层深度：依据Weller与Plueddemann 1996（doi:10.1029/96JC00206）的方法估算。
- 颗粒有机碳（Particulate Organic Carbon, POC）浓度：POC通过经过质量控制的700纳米波长光学颗粒后向散射测量数据，以及经过质量控制的叶绿素-a浓度，依据Koestner等人（2022, doi:10.3389/fmars.2022.941950）的方法计算得到。
- 真光层深度：定义为光合有效辐射（Photosynthetically Available Radiation, PAR）衰减至海表下方初始值1%的深度，遵循Kirk（1994, doi:10.1017/CBO9780511623370）的定义。在估算真光层深度前，需通过对400–700纳米波段的光谱下行辐照度信号积分得到PAR剖面；随后依据La Forgia与Organelli（2025, doi:10.1002/lom3.10701）提出的算法对每条PAR剖面进行实时质量控制，并依据Organelli等人（2016, doi:10.1175/JTECH-D-15-0193.1）的方法校正云与波浪聚焦效应。

该衍生产品数据集会在新的剖面数据可用时，以近实时的方式持续更新。

本数据集源自国际Argo计划及其参与国项目收集并免费公开的数据（https://argo.ucsd.edu, https://www.ocean-ops.org）。Argo计划属于全球海洋观测系统的组成部分。