The Atlantic meridional overturning circulation at 35N from deep moorings, floats, and satellite altimeter

These are the data that accompany the publication "The Atlantic meridional overturning circulation at 35N from deep moorings, floats, and satellite altimeter" by Le Bras, Willis, and Fenty.

The netcdf file AMOC35.nc includes the final Atlantic meridional overturning circulation (AMOC) transports presented in the manuscript. It includes "AMOCdepth": the AMOC transport in depth space; "AMOCsigma": the AMOC transport in density space (specifically potential density referenced to 2000m); "psi": the integrated across-basin transport streamfunction in depth space; and "Ekman": is the Ekman transport time series derived from CCMP as described in the manuscript. Note that the Ekman transport is included in the total AMOC transport; we provide it here so that it can be easily removed. All variables in AMOC35.nc have units of Sverdrups (Sv).

The netcdf file AMOC35_gridded_velocities.nc is significantly larger. It includes "vg" (in m/s): the geostrophic velocity through the section; "sigma2" (in kg/m3): the potential density anomaly referenced to 2000m; "bathymetry" (in m): the depth of the sea floor along the section; and "area" (in m2): the area of each grid point. Note that no total transport correction has been applied to this geostrophic velocity; the AMOC transport cannot be extracted directly from it. This velocity and the auxiliary fields are provided for those who wish to reproduce and test our results.

Both files were saved as structured python xarray Datasets with labeled coordinates (https://docs.xarray.dev/en/stable/generated/xarray.Dataset.html). In AMOC35.nc, the coordinates are "date" (in python datetime format) and "depth" (in m). The alternatives "time" (in decimal years) and "pressure" (in db) are also available. AMOC35_gridded_velocities.nc additionally includes the coordinate "distance" (in km) with longitude ("lon") and latitude ("lat"), also available.

本数据集配套于Le Bras、Willis与Fenty发表的题为《基于深海锚系、浮标及卫星高度计的35°N大西洋经向翻转环流（Atlantic meridional overturning circulation, AMOC）》的研究论文。

netCDF文件AMOC35.nc包含论文中呈现的最终版大西洋经向翻转环流（AMOC）输运量数据。其中包含："AMOCdepth"：深度坐标系下的AMOC输运量；"AMOCsigma"：密度坐标系下的AMOC输运量（具体为以2000米为参考面的位密度）；"psi"：深度坐标系下的跨洋盆积分输运流函数；"Ekman"：如论文所述，由CCMP衍生得到的埃克曼输运时间序列。需注意，埃克曼输运已包含在总AMOC输运量中，此处单独提供以便于用户可便捷地将其移除。AMOC35.nc中的所有变量单位均为斯维尔德鲁普（Sverdrups, Sv）。

netCDF文件AMOC35_gridded_velocities.nc体积显著更大，其中包含："vg"（单位：米/秒）：通过观测断面的地转流速；"sigma2"（单位：千克/立方米）：以2000米为参考面的位密度距平；"bathymetry"（单位：米）：观测断面沿线的海底水深；"area"（单位：平方米）：每个网格点的面积。需注意，该地转流速未经过总输运量校正，无法直接从中提取AMOC输运量。此处提供该流速数据及辅助场，以供希望复现与验证本研究结果的用户使用。

两个文件均以带标签坐标的结构化Python xarray数据集格式存储（详见：https://docs.xarray.dev/en/stable/generated/xarray.Dataset.html）。在AMOC35.nc中，坐标维度为"date"（采用Python datetime格式）与"depth"（单位：米），同时也提供替代坐标"time"（单位：十进制年）与"pressure"（单位：分巴，db）。AMOC35_gridded_velocities.nc额外包含坐标维度"distance"（单位：千米），同时也提供经度（"lon"）与纬度（"lat"）坐标。