Mixed layer depth climatology computed with a density threshold criterion of 0.03kg/m3 from 10 m depth value

The dataset made available here is the monthly climatology (i.e. 12 months) of ocean surface Mixed Layer Depth (MLD) over the global ocean, at 1 degree x 1 degree spatial resolution. The climatology is based on about 7.3 million casts/profiles of temperature and salinity measurements made at sea between January 1970 and December 2021. Those profiles data come from the ARGO program and from the NCEI-NOAA World Ocean Database (WOD, Boyer et al. 2018). The MLD is computed on each individual cast/profile using a threshold criterion. The depth of the mixed layer is defined as the shallowest depth where the surface potential density of the profile is superior to a reference value taken close to the surface added with the chosen threshold. Here we take a threshold value for the density of 0.03kg/m3, and a surface reference depth fixed at 10m (de Boyer Montégut et al., 2004). This mixed layer is by definition homogeneous in density (up to 0.03 kg/m3 variations) and can also be called an isopycnal layer. It is especially intended for validation of MLD fields of the Ocean General Circulation Models of the ocean sciences community (e.g. Tréguier et al., 2023, Iovino et al. 2023, using v2022 of this dataset). More information and some other related datasets can be found at : https://cerweb.ifremer.fr/mld (or https://www.umr-lops.fr/en/Data/MLD redirecting to previous page).

本公开数据集为全球海洋1°×1°空间分辨率的逐月海洋表层混合层深度（Mixed Layer Depth, MLD）气候态数据集，涵盖12个月份。该气候态数据集基于1970年1月至2021年12月期间获取的约730万条海洋温盐观测剖面。上述剖面数据来源于ARGO计划，以及美国国家环境信息中心-美国国家海洋和大气管理局世界海洋数据库（NCEI-NOAA World Ocean Database, WOD, Boyer et al. 2018）。研究人员通过阈值判据对每条独立剖面计算混合层深度：混合层深度被定义为，剖面表层位势密度大于贴近海面的参考密度值与选定阈值之和的最浅水深。本数据集采用的密度阈值为0.03kg/m³，海面参考深度固定为10m（de Boyer Montégut et al., 2004）。此类混合层在定义上密度均匀（密度变化幅度不超过0.03kg/m³），亦可称为等密度层（isopycnal layer）。本数据集主要用于海洋科学领域的海洋总环流模型的混合层深度场验证工作（例如Tréguier et al., 2023、Iovino et al. 2023均使用了该数据集的2022版本）。更多相关信息及其他关联数据集可通过以下链接获取：https://cerweb.ifremer.fr/mld（或https://www.umr-lops.fr/en/Data/MLD，该链接将跳转至前述页面）。

搜集汇总

背景与挑战

背景概述

该数据集提供了全球海洋表面混合层深度的月气候学数据，基于大量温度盐度测量剖面，采用密度阈值标准计算。适用于海洋环流模型的验证和物理海洋学研究。