E-HYPE (v4.3.2) dataset 2000-2024 - daily river water, nutrient, sediment flows and water temperature at Europe's coastal outlets

Description The dataset is an element of FOCCUS (WP 5: Building, validation and demonstration of improved model interfaces in the Land-Ocean Continuum), included in Deliverables 5.1 and 5.2. The dataset is produced with help of E-HYPE hydrological model (v4.3.2 - 2025), and covers the time period 2000-2024 at 5302 coastal outlet points within Europe. Simulated variables provided at a daily time-step and include streamflow, nitrogen and phosphorus in several forms, and suspended sediment concentrations. NOTE: the current version outputs are completely different from the previously published dataset https://zenodo.org/records/17936484. Technical details The dataset is produced at SMHI with use of E-HYPE continental hydrological model version 4.3.2 executed with HYPE code v.5.26.0. Outlet point description: “EH432_coast_outlets.csv" file describes metadata for EH4 outlet points discharging into coastal zones. Smaller rivers and creeks along the coastline may be aggregated into one catchment with one virtual outlet point that does not represent any particular river. Columns in this file: SUBID: E-HYPE v4.3.2 catchment identification number (similar to E-HYPE v4.2.3 published within D4.1 in 2024) POURX: WGS 1984 longitude of the outlet point [decimal degrees] POURY: WGS 1984 latitude of the outlet point [decimal degrees] AREA: catchment area, square meters [m2] UPAREA: upstream area draining to the catchment, square meters [m2] Data description: Daily time series of EH4 v4.3.2 outputs are provided for each coastal outlet (identified by “SUBID”) in and plain text files. The following variables are provided: cout: freshwater discharge (eh432postprocessed - ML-based postprocessed), cubic meters/second [m3/s] cout: freshwater discharge (eh432), cubic meters/second [m3/s] ccin: simulated concentration of inorganic nitrogen, microgram per liter [μg/L] ccon: simulated concentration of organic nitrogen, microgram per liter [μg/L] cctn: simulated concentration of total nitrogen, microgram per liter [μg/L] ccsp: simulated concentration of soluble (reactive) phosphorus, microgram per liter [μg/L] ccpp: simulated concentration of particulate phosphorus, microgram per liter [μg/L] cctp: simulated concentration of total phosphorus, microgram per liter [μg/L] ccts: simulated concentration of total suspended solids, milligram per litre [mg/L] cct2: simulated water temperature [degrees C] NOTE: Streamflow discharge COUT is provided in two files and have certain particularities that users need to be aware about: COUT_eh432postprocessed_2000_2024_coast.txt - ML-postprocessed time-series include improved discharge time series at the coastal outlets. This improvement covers only coastal outlet locations. Recommended to use as an inflow to coastal zones of seas. COUT_eh432_2000_2024_coast.txt - original E-HYPE outputs. Simulated streamflow is more balanced along the watercourses within the model routine. This dataset provides consistency between coastal outlets and upstream sectors of rivers, which could be useful in the e.g. river deltas (if bifurcations are represented in E-HYPE). Water temperature CCT2 is not a scope of the project, but an addition to the provided simulations. CCT2 is provided as uncalibrated output which was evaluated based on statistical analysis and visual inspection (due to the lack of reliable, harmonized, and consistent water temperature observations across Europe in the current model). 3 outlets showed unrealistically high temperature values and were identified as outliers (higher than 2x of 3rd quartile value during any of 4 seasons). Since these anomalies were consistently associated with specific locations, the affected outlets were completely excluded from the dataset. Despite the evaluation and complete removal of identified outlets, some outliers in the time-series may still remain and could require additional filtering for local-scale applications. Therefore, this dataset should be considered approximate and preliminary, and it may not be suitable for analyses requiring high temperature accuracy, such as threshold-based fisheries applications. Spatial coverage 5302 coastal outlet points along the coastline of E-HYPE4 domain (Europe). 5299 outlets with water temperature simulated time series. Period and time-step 2000-2024 (daily) Contact information Pavel Terskii, researcher, SMHI. [e-mail]