Physical and biogeochemical properties of California Current upwelled source waters

Coastal upwelling variability in the California Current region, one of the four main eastern boundary current upwelling systems, is controlled by processes acting over a wide range of spatial and temporal scales. While the ensuing ecosystem response depends strongly on upwelled water properties, determining their exact physical and biogeochemical characteristics is notoriously difficult as it requires tracking water masses backward in space and time from the moment they upwell near the coast to their subsurface origin. Adjoint model simulations have been used successfully to track water masses in coastal upwelling systems and the work presented here extends these applications to determining the co-variability of physical and biogeochemical properties of source waters at spatial scales that resolve the known alongshore variability of coastal upwelling dynamics in the region. Notably, the results identify that the modulation of coastal upwelling efficiency by onshore/offshore geostrophic ..., This dataset is derived from adjoint passive tracer simulations for the central California Current upwelling system. The physical model is an implementation of the Regional Ocean Modelling System (ROMS; www.myroms.org) coupled to NEMUCSC, a customized version of the North Pacific Ecosystem Model for Understanding Regional Oceanography (NEMURO). The adjoint model is used to track backward-in-time passive tracer concentrations originating from nearshore locations where upwelled water masses are typically found in the central CCS. The simulations are implemented such that adjoint passive tracers at any time in the past represent the source locations of water masses initially present over a 14-day period in 0.5° alongshore bins extending 0–30 km offshore and 0–20 m deep. The adjoint simulations The dataset was produced with Ferret V7.1 (http://ferret.pmel.noaa.gov/Ferret) and is in NetCDF4 format (CF-1.4 compliant) with metadata describing each variable name and associated units., , # Physical and biogeochemical properties of California Current upwelled source waters

[https://doi.org/10.5061/dryad.tqjq2bw5f](https://doi.org/10.5061/dryad.tqjq2bw5f)

## Description of the data and file structure

The dataset is in NetCDF4 format (CF-1.4 compliant) with metadata describing each variable name and associated units. Variables in the dataset represent the geographical (longitude, latitude, and depth), physical (density anomaly and spiciness), and biogeochemical (nitrate, ammonium, particulate organic nitrogen, dissolved oxygen, and pH) properties of upwelled source waters in the central California Current during spring (May-June) and summer (July-August). Each source water property is associated with a year (1990-2010) and the nearhsore subregion (16 0.5 deg. alonshore coastal bins between 35-43N) to which it contributes.

## Sharing/Access information

Any software capable of reading NetCDF4 format can be used to open the data file. All necessary information to use thi...

加利福尼亚海流区域作为四大主要东边界上升流系统之一，其海岸上升流变异性受到跨广泛时空尺度的过程调控。由此引发的生态系统响应强烈依赖于上升流水体的属性，但精准确定其物理与生物地球化学特征极具挑战性——因为需要从水体近岸上升的时刻，反向追踪其空间与时间维度上的次表层起源水团。伴随模型（adjoint model）模拟已成功应用于海岸上升流系统的水团追踪，本研究将此类应用拓展至解析源水体物理与生物地球化学属性的协同变异性，其空间尺度可分辨该区域已知的海岸上升流动力学沿岸变异性。值得注意的是，研究结果揭示了近岸/离岸地转流对海岸上升流效率的调控作用……

本数据集源自加利福尼亚中部海流上升流系统的伴随被动示踪剂模拟。物理模型采用区域海洋建模系统（Regional Ocean Modelling System, ROMS; www.myroms.org），并与定制化的北太平洋海洋生态系统理解区域海洋学模型（North Pacific Ecosystem Model for Understanding Regional Oceanography, NEMURO）的定制版本NEMUCSC耦合。本研究使用伴随模型，对加利福尼亚中部海流近岸典型上升流水体起源位置的反向时间被动示踪剂浓度进行追踪。模拟设置如下：过去任意时刻的伴随被动示踪剂，对应1990—2010年间14天时段内，离岸0–30 km、深度0–20 m的沿岸0.5°分箱（覆盖35°N–43°N的16个沿岸沿海分箱）中初始存在的水团的源位置。本数据集由Ferret V7.1（http://ferret.pmel.noaa.gov/Ferret）生成，格式为NetCDF4（符合CF-1.4标准），并附带描述各变量名称与对应单位的元数据。

# 加利福尼亚海流上升流源水体的物理与生物地球化学属性
https://doi.org/10.5061/dryad.tqjq2bw5f

## 数据与文件结构描述
本数据集采用NetCDF4格式（符合CF-1.4标准），附带描述各变量名称与对应单位的元数据。数据集中的变量代表加利福尼亚中部海流春季（5—6月）与夏季（7—8月）期间，上升流源水体的地理（经度、纬度与深度）、物理（密度距平与海水尖度（spiciness））、生物地球化学（硝酸盐、铵盐、颗粒有机氮、溶解氧与pH值）属性。每个源水体属性均关联有年份（1990—2010年）以及其所贡献的近岸子区域（35°N–43°N间的16个0.5°沿岸沿海分箱）。

## 共享/访问信息
任何支持NetCDF4格式的软件均可打开本数据文件。所有用于使用本数据集的必要信息……