This dataset contains information on pelagic silicon cycling in river, estuary and marine samples collected from the Severn Estuary, UK, in 2016. 

Zone - refers to location in river-estuary-marine system, with Zone 1 referring to upper river, Zone 2 referring to lower river, Zone 3 referring to the estuary, and Zone 4 to the marine system. Each sampling station has a unique identifying code. Latitudes and longitudes are provided.

DSi - dissolved silica (silicic acid) (mg/L)

BSi - alkaline extracted biogenic silica (mg/L)

Nitrate - dissolved nitrate (mg/L)

Phosphate - dissolved phosphate (mg/L)

Nitrite - dissolved nitrite (mg/L)

Ammonium - dissolved ammonium (mg/L)

Water T - temperature (degrees centigrade)

pH - water pH

Salinity - water salinity

TOC - total organic carbon (mg/L)

SPM - suspended particulate matter (mg/L)
 
For full details of sampling locations and methodology, see Welsby (2019) “Feeding the ocean? A biological mediation of estuarine silicon”, PhD Thesis, University of Bristol.
 
https://research-information.bris.ac.uk/ws/portalfiles/portal/218675200/Final_Copy_2019_10_01_Welsby_H_PhD.pdf