NPC-Legacy-Sweden

This dataset contains concentration data for total nitrogen (totN), total phosphorus (totP), and total organic carbon (TOC) in combination with modeled discharge data. These refer to a selection of coastal Swedish catchments and sub-catchments surrounding lake Mälaren (central Sweden).

The dataset used as source material data from a larger public data repository from national and regional Swedish environmental monitoring ( https://miljodata.slu.se/mvm ) and the Swedish meteorological and hydrological institute ( https://www.smhi.se/data/hydrologi/vattenwebb ).   

Data presented in this dataset refer to a selection of not overlapping catchments that vary greatly in size and are representative of different regions of the Swedish country. Here concentration measures and discharge data are coupled based on both time and space.

Combined time-series of discharges and concentrations across the time window 1990-2018 (where available from the above-cited data repository) are collected in txt files identified by the catchment ID and the concentration pollutant (totN/totP/TOC).

In addition to the time series the file “Catchements_summary_data.xlsx” contain extra information about each catchment:

Maps of all the catchments and identification numbers

ID identification code of different catchments in the study. The code is composed of two letters standing for a) C/S Coastal/Sub-catchments b) L/S Large/Small and a numerical code base on the ID of the concentration measurement station reported in the figures in the Catchments reference sheet

Latitude and longitude of Concentration measuring stations near catchment closure points. Coordinates are given in decimal degrees and based on the projection SWEREF99 TM

Average concentration from measured data over the time period given in ug/l for totN and totP and mg/l for TOC

Estimated legacy concentration data are given in ug/l for totN and totP and mg/l for TOC

Estimated Active concentration data are given in ug/l for totN and totP and mg/l for TOC

Average discharge data are given in m3/s

Average catchments area is given in km2

Agricultural land share as a percentage of the total area (data source: https://vattenwebb.smhi.se/modelregion/)

Forest land share as a percentage of the total area (data source: https://vattenwebb.smhi.se/modelregion/)

Funding: the dataset is part of a project funded by the Bolin Centre for Climate Research at Stockholm University, RA7 project SUB-ECOCLIM. Open-access funding is provided by Stockholm University.

本数据集包含总氮（total nitrogen, totN）、总磷（total phosphorus, totP）及总有机碳（total organic carbon, TOC）的浓度数据，配套经建模得到的径流数据。研究对象为瑞典中部梅拉伦湖（Lake Mälaren）周边的瑞典沿海集水区及子集水区样本。

本数据集的源数据来自瑞典国家级与区域级环境监测的大型公开数据库（https://miljodata.slu.se/mvm），以及瑞典气象与水文研究所（https://www.smhi.se/data/hydrologi/vattenwebb）。

本数据集涵盖的非重叠集水区样本在规模上差异显著，且能代表瑞典不同区域的水文环境特征。数据集将浓度监测数据与径流数据基于时空维度进行匹配耦合。

1990-2018年时段内（可从上述公开数据库获取对应数据）的径流与浓度组合时间序列，被整理为以集水区ID与污染物类型（totN/totP/TOC）命名的文本文件。

除时间序列数据外，文件「Catchments_summary_data.xlsx」包含各集水区的补充信息：

1. 所有集水区的分布图及识别编号：研究中不同集水区的ID编码规则为：两位字母前缀（C/S代表沿海/子集水区；L/S代表大型/小型集水区），后缀为基于集水区参考表附图中浓度监测站ID生成的数字编码。
2. 集水区闭合点附近浓度监测站的经纬度坐标：坐标以十进制度为单位，采用SWEREF99 TM投影坐标系。
3. 时段内实测浓度均值：总氮、总磷的单位为微克每升（μg/L），总有机碳的单位为毫克每升（mg/L）。
4. 估算的历史遗留浓度数据：总氮、总磷的单位为μg/L，总有机碳的单位为mg/L。
5. 估算的现行浓度数据：总氮、总磷的单位为μg/L，总有机碳的单位为mg/L。
6. 平均径流数据：单位为立方米每秒（m³/s）。
7. 集水区平均面积：单位为平方千米（km²）。
8. 农业用地占总面积的百分比（数据来源：https://vattenwebb.smhi.se/modelregion/）。
9. 林地占总面积的百分比（数据来源：https://vattenwebb.smhi.se/modelregion/）。

资助说明：本数据集是瑞典斯德哥尔摩大学博林气候研究中心资助的RA7项目SUB-ECOCLIM的研究成果，斯德哥尔摩大学提供开放获取经费支持。