Computation of nitrate concentrations in turbid coastal waters using an in situ ultraviolet spectrophotometer.

Zielinski, O., Voß, D., Saworski, B., Fiedler, Björn and Körtzinger, Arne (2011) Computation of nitrate concentrations in turbid coastal waters using an in situ ultraviolet spectrophotometer. Journal of Sea Research, 65 (4). pp. 456-460. DOI 10.1016/j.seares.2011.04.002.

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Abstract

In order to investigate biogeochemical cycling and dynamics of nutrients, measurement capabilities with sufficient spatial and temporal resolution are required. New ultraviolet-based methods and instrumentation for in situ determination of nitrate provide a powerful tool for these purposes. Here, we present a full dataset obtained by an UV-based process spectrophotometer (ProPS) during a cruise in 2008 in the south-eastern North Sea. Due to highly turbid conditions and mixing water masses, an improved calculation algorithm was performed on the UV absorption data. Nitrate concentrations ranged from 0 to 9 μmol/L on very short timescales, mainly due to tidal effects. Comparison of continuous optical nitrate measurements was performed against conventional wet-chemical analyses of discrete water samples which lead to a standard deviation of 1.7 μmol/L NO3−. High resolution measurements performed at a tidal inlet demonstrated the capability to map nitrate dynamics in turbid coastal environments.

Research highlights:
► We present a new method for in situ determination of nitrate in turbid waters. ► UV spectrophotometer data is coupled with salinity and temperature sampling. ► A full dataset from a coastal inlet in the south-eastern North Sea is presented. ► Comparison against wet-chemical analyses lead to an accuracy of 1.7 μmol/L NO3−. ► High resolution sampling enabled time-space mapping of nitrate dynamics.

Document Type: Article
Keywords: Marine chemistry; Nitrate; Ultraviolet; In Situ Photometer; Coastal Waters; Wadden Sea; North Sea; Data processing
Research affiliation: Kiel University
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
AWI
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.seares.2011.04.002
ISSN: 1385-1101
Date Deposited: 01 Nov 2011 08:48
Last Modified: 23 Sep 2019 23:24
URI: http://oceanrep.geomar.de/id/eprint/12423

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