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Increasing nitrogen limitation in the Bothnian Sea, potentially caused by inflow of phosphate-rich water from the Baltic Proper.

Rolff C, Elfwing T - Ambio (2015)

Bottom Line: This is affected by the by inflow of phosphate-rich and oxygen-depleted water from depths near the halocline in the northern Baltic Proper, where severe oxygen conditions currently cause extreme phosphate concentrations in the deep water.The change in relation between inorganic nitrogen and phosphorous in the BS occurs first in the deep water and then progresses to the surface water.The change can potentially cause increased production in the BS and more frequent cyanobacterial blooms.

View Article: PubMed Central - PubMed

Affiliation: Stockholm University Baltic Sea Centre, 106 91, Stockholm, Sweden. carl.rolff@su.se.

ABSTRACT
The study showed that the open water of the Bothnian Sea (BS) is likely to have shifted from altering nitrogen and phosphorous limitations of the spring bloom to more nitrogen-limited conditions during the last 20 years. This is affected by the by inflow of phosphate-rich and oxygen-depleted water from depths near the halocline in the northern Baltic Proper, where severe oxygen conditions currently cause extreme phosphate concentrations in the deep water. The change in relation between inorganic nitrogen and phosphorous in the BS occurs first in the deep water and then progresses to the surface water. The change can potentially cause increased production in the BS and more frequent cyanobacterial blooms. There does not appear to be any immediate concern in the short-term perspective for the state of the BS, but a progression of the processes may lead to a more eutrophic state of the BS.

No MeSH data available.


Related in: MedlinePlus

Map of the Baltic Sea indicating the Bothnian Bay (BB), Bothnian Sea (BS), Åland Sea (ÅS), Archipelago Sea, and the northern Baltic Proper (nBP), and monitoring stations supplying data to the study. The Gulf of Bothnia (GoB) consists of the BB, BS, ÅS, and the Archipelago Sea
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Fig1: Map of the Baltic Sea indicating the Bothnian Bay (BB), Bothnian Sea (BS), Åland Sea (ÅS), Archipelago Sea, and the northern Baltic Proper (nBP), and monitoring stations supplying data to the study. The Gulf of Bothnia (GoB) consists of the BB, BS, ÅS, and the Archipelago Sea

Mentions: The GoB is a large fjord-like, estuarine, nontidal water body. It is in the west, north and east enclosed by Sweden and Finland. The surface salinity decreases from 5 to 6 PSU in the south to 2 PSU in the north. It consists of two major basins separated by a sill: the northern Bothnian Bay (BB) and the southern Bothnian Sea (BS) (Fig. 1). The BB and BS, respectively, have volumes of 1481 and 4308 km3 and mean depths of 41 and 66 m (Leppäranta and Myrberg 2009). The residence time of water in the GoB is short and has for the BS recently been estimated to 4 years (Yi et al. 2013).Fig. 1


Increasing nitrogen limitation in the Bothnian Sea, potentially caused by inflow of phosphate-rich water from the Baltic Proper.

Rolff C, Elfwing T - Ambio (2015)

Map of the Baltic Sea indicating the Bothnian Bay (BB), Bothnian Sea (BS), Åland Sea (ÅS), Archipelago Sea, and the northern Baltic Proper (nBP), and monitoring stations supplying data to the study. The Gulf of Bothnia (GoB) consists of the BB, BS, ÅS, and the Archipelago Sea
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4591228&req=5

Fig1: Map of the Baltic Sea indicating the Bothnian Bay (BB), Bothnian Sea (BS), Åland Sea (ÅS), Archipelago Sea, and the northern Baltic Proper (nBP), and monitoring stations supplying data to the study. The Gulf of Bothnia (GoB) consists of the BB, BS, ÅS, and the Archipelago Sea
Mentions: The GoB is a large fjord-like, estuarine, nontidal water body. It is in the west, north and east enclosed by Sweden and Finland. The surface salinity decreases from 5 to 6 PSU in the south to 2 PSU in the north. It consists of two major basins separated by a sill: the northern Bothnian Bay (BB) and the southern Bothnian Sea (BS) (Fig. 1). The BB and BS, respectively, have volumes of 1481 and 4308 km3 and mean depths of 41 and 66 m (Leppäranta and Myrberg 2009). The residence time of water in the GoB is short and has for the BS recently been estimated to 4 years (Yi et al. 2013).Fig. 1

Bottom Line: This is affected by the by inflow of phosphate-rich and oxygen-depleted water from depths near the halocline in the northern Baltic Proper, where severe oxygen conditions currently cause extreme phosphate concentrations in the deep water.The change in relation between inorganic nitrogen and phosphorous in the BS occurs first in the deep water and then progresses to the surface water.The change can potentially cause increased production in the BS and more frequent cyanobacterial blooms.

View Article: PubMed Central - PubMed

Affiliation: Stockholm University Baltic Sea Centre, 106 91, Stockholm, Sweden. carl.rolff@su.se.

ABSTRACT
The study showed that the open water of the Bothnian Sea (BS) is likely to have shifted from altering nitrogen and phosphorous limitations of the spring bloom to more nitrogen-limited conditions during the last 20 years. This is affected by the by inflow of phosphate-rich and oxygen-depleted water from depths near the halocline in the northern Baltic Proper, where severe oxygen conditions currently cause extreme phosphate concentrations in the deep water. The change in relation between inorganic nitrogen and phosphorous in the BS occurs first in the deep water and then progresses to the surface water. The change can potentially cause increased production in the BS and more frequent cyanobacterial blooms. There does not appear to be any immediate concern in the short-term perspective for the state of the BS, but a progression of the processes may lead to a more eutrophic state of the BS.

No MeSH data available.


Related in: MedlinePlus