https://doi.pangaea.de/10.1594/PANGAEA.995415Kirstein, Inga VanessaInga VanessaKirstein0000-0003-2580-2694Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenCarstens, KristineKristineCarstensAlfred Wegener Institute - Biological Institute HelgolandWiltshire, Karen HelenKaren HelenWiltshire0000-0002-7148-0529Alfred Wegener Institute - Biological Institute HelgolandPANGAEA2026LTERLTODATE/TIMELATITUDELONGITUDEDEPTH, waterLocationDepth of Secchi DiskQuality flag, Secchi DiskTemperature, waterQuality flag, water temperatureAnalystSalinityQuality flag, salinitySilicateQuality flag, silicatePhosphateQuality flag, phosphateNitriteQuality flag, nitriteNitrateNitrate and NitriteQuality flag, nitrate and nitriteAmmoniumQuality flag, ammoniumNitrogen, inorganic, dissolvedConditionpHQuality flag, pHOxygenQuality flag, oxygenMonitoringSecchi diskArgo quality control flags according to Thierry et al. (2022)Reversing thermometerSalinometer, Guildline Instruments, 8400B AutosalSeawater analysis after Grasshoff et al. (1983)Calculated (difference of (Nitrate and Nitrite) and Nitrite)Calculated (sum of Nitrate, Nitrite, Ammonium)LTER_HelgolandRoadsMarine Station HelgolandHelgoland Roads long-term observations (LTO_HelgolandRoads)2013-01-01T08:20:00/2013-12-30T08:40:00Dataset10.1594/PANGAEA.96037510.1594/PANGAEA.86467610.1002/iroh.1985070023210.13155/298256427 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalIn 2013, the hydrochemistry of surface water was monitored at Helgoland Roads station on every workday, typically before 9 a.m. Temperature was measured on board immediately after sampling. Visibility was measured on board using a Secchi Disk. Salinity, dissolved inorganic nutrients, pH and oxygen were measured from a bucket sample in the laboratory.7.90000000000003154.18800000000009German Bight, North Sea