Open Government Licence (OGL)

Eutrophication - Dissolved inorganic nitrogen (salinity normalised) 2002-2019

Marine Scotland Information NMPi icon

Since 2001 surface water samples have been collected from Scottish coastal and offshore waters during January, and have been analysed for nutrients (nitrate, phosphate, silicate and ammonia) with the aim of establishing regional background nutrient concentrations and contributing towards an assessment of the eutrophication status of Scottish coastal and offshore waters.

Surface water samples were collected at 15 minute intervals from the non-toxic water supply of FRV Scotia IV, during the MSS CSEMP cruise. The input for the non-toxic water supply is situated on the hull of the ship at a depth of ~ 4.5 m. Water samples were analysed at sea within 10 hours of collection (where possible) using a Bran & Luebbe QuAAtro continuous flow autoanalyser. The method for analysis of nutrients in seawater is accredited to ISO17025 standards by the United Kingdom Accreditation Service.

Nutrient data can be assessed against assessment criteria established by OSPAR as indicators of nutrient enrichment (OSPAR 2005). Background levels (or concentrations) and assessment levels (50% above background levels) are used to assess nutrient concentrations; concentrations above the assessment level may lead, in time, to an undesirable disturbance to the marine ecosystem.

Dissolved inorganic nitrogen (DIN) is the sum of the concentration of total oxidised nitrogen (TOxN) and ammonia. Ammonia contributes only about 5% to the DIN concentration in Scottish regions

Proposed Deep Sea Marine Reserve contributing to the MPA Network

Marine Scotland Information NMPi icon

The Scottish Government is consulting on the creation of a Deep Sea Marine Reserve in the Rockall Trough off the West Coast of Scotland. If taken forward to designation, the site would be underpinned by the powers in the Marine and Coastal Access Act 2009. This means in legal terms it would have the same status as the other existing Marine Protected Areas in offshore waters. The Rockall Trough, if designated would help meet our international commitments to protect the marine environment in the North-East Atlantic, as required under the OSPAR Convention.

Distribution of impulsive noise events, Total Pulse Block Days (PBD) for 2015-2017 (time-aware)

Marine Scotland Information NMPi icon

The UK Marine Noise Registry (MNR) is a database that records the spatial and temporal distribution of loud, low to medium frequency (10Hz – 10kHz) impulsive noise generating activities in UK seas. This layer shows the distribution of impulsive noise events for Scotland's seas, extracted from the MNR and shown in Total Pulse Block Days (PBD) per year for 2015-2017.

This layer is timeaware on MS Maps NMPi and is intended to be updated yearly.

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