Limits...
The great 2012 Arctic Ocean summer cyclone enhanced biological productivity on the shelves.

Zhang J, Ashjian C, Campbell R, Hill V, Spitz YH, Steele M - J Geophys Res Oceans (2014)

Bottom Line: In the central PSA, however, model simulations indicate a decrease in PP and plankton biomass.The simulated biological gain on the shelves is greater than the loss in the central PSA, and therefore, the production on average over the entire PSA is increased by the cyclone.The generally positive impact of cyclones on the marine ecosystem in the Arctic, particularly on the shelves, is likely to grow with increasing summer cyclone activity if the Arctic continues to warm and the ice cover continues to shrink.

View Article: PubMed Central - PubMed

Affiliation: Applied Physics Laboratory, University of Washington Seattle, Washington, USA.

ABSTRACT

[1] A coupled biophysical model is used to examine the impact of the great Arctic cyclone of early August 2012 on the marine planktonic ecosystem in the Pacific sector of the Arctic Ocean (PSA). Model results indicate that the cyclone influences the marine planktonic ecosystem by enhancing productivity on the shelves of the Chukchi, East Siberian, and Laptev seas during the storm. Although the cyclone's passage in the PSA lasted only a few days, the simulated biological effects on the shelves last 1 month or longer. At some locations on the shelves, primary productivity (PP) increases by up to 90% and phytoplankton biomass by up to 40% in the wake of the cyclone. The increase in zooplankton biomass is up to 18% on 31 August and remains 10% on 15 September, more than 1 month after the storm. In the central PSA, however, model simulations indicate a decrease in PP and plankton biomass. The biological gain on the shelves and loss in the central PSA are linked to two factors. (1) The cyclone enhances mixing in the upper ocean, which increases nutrient availability in the surface waters of the shelves; enhanced mixing in the central PSA does not increase productivity because nutrients there are mostly depleted through summer draw down by the time of the cyclone's passage. (2) The cyclone also induces divergence, resulting from the cyclone's low-pressure system that drives cyclonic sea ice and upper ocean circulation, which transports more plankton biomass onto the shelves from the central PSA. The simulated biological gain on the shelves is greater than the loss in the central PSA, and therefore, the production on average over the entire PSA is increased by the cyclone. Because the gain on the shelves is offset by the loss in the central PSA, the average increase over the entire PSA is moderate and lasts only about 10 days. The generally positive impact of cyclones on the marine ecosystem in the Arctic, particularly on the shelves, is likely to grow with increasing summer cyclone activity if the Arctic continues to warm and the ice cover continues to shrink.

No MeSH data available.


Schematic of the BIOMAS ecosystem model [Zhang et al., 2010]. Marked are two phytoplankton components (diatoms, flagellates), three zooplankton components (small zooplankton/microzooplankton, copepods, predator zooplankton), dissolved organic nitrogen (DON), detrital particulate organic nitrogen (detritus), particulate organic silica (opal), nitrate (NO3), ammonium (NH4), and silicate (Si(OH)4). Solid black arrows indicate nitrogen flows and blue arrows indicate silicon flows. The black discontinuous arrows are flows to the dissolved organic matter and the blue discontinuous arrows are the flows to ammonium.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4508965&req=5

fig03: Schematic of the BIOMAS ecosystem model [Zhang et al., 2010]. Marked are two phytoplankton components (diatoms, flagellates), three zooplankton components (small zooplankton/microzooplankton, copepods, predator zooplankton), dissolved organic nitrogen (DON), detrital particulate organic nitrogen (detritus), particulate organic silica (opal), nitrate (NO3), ammonium (NH4), and silicate (Si(OH)4). Solid black arrows indicate nitrogen flows and blue arrows indicate silicon flows. The black discontinuous arrows are flows to the dissolved organic matter and the blue discontinuous arrows are the flows to ammonium.

Mentions: [5] BIOMAS is a coupled biophysical model [Zhang et al., 2010] that has three model elements: a sea ice model, an ocean circulation model, and a pelagic biological model. The pelagic biological model is an 11-component marine pelagic ecosystem model that includes two phytoplankton components (diatoms and flagellates), three zooplankton components (microzooplankton, copepods, and predator zooplankton), dissolved organic nitrogen, detrital particulate organic nitrogen, particulate organic silica, nitrate, ammonium, and silicate (Figure 3) [Zhang et al., 2010; also see Kishi et al., 2007]. Values of key biological parameters used in the model are listed in Zhang et al. [2010]. The ocean circulation model is based on the Parallel Ocean Program (POP) developed at Los Alamos National Laboratory [Smith et al., 1992]. The POP ocean model is modified so that open boundary conditions can be specified [Zhang and Steele, 2007]. The sea ice model is a 12 category thickness and enthalpy distribution (TED) sea ice model [Zhang and Rothrock, 2003; Hibler, 1980]. It is adopted from the Pan-arctic Ice/Ocean Modeling and Assimilation System (PIOMAS) [Zhang and Rothrock, 2003].


The great 2012 Arctic Ocean summer cyclone enhanced biological productivity on the shelves.

Zhang J, Ashjian C, Campbell R, Hill V, Spitz YH, Steele M - J Geophys Res Oceans (2014)

Schematic of the BIOMAS ecosystem model [Zhang et al., 2010]. Marked are two phytoplankton components (diatoms, flagellates), three zooplankton components (small zooplankton/microzooplankton, copepods, predator zooplankton), dissolved organic nitrogen (DON), detrital particulate organic nitrogen (detritus), particulate organic silica (opal), nitrate (NO3), ammonium (NH4), and silicate (Si(OH)4). Solid black arrows indicate nitrogen flows and blue arrows indicate silicon flows. The black discontinuous arrows are flows to the dissolved organic matter and the blue discontinuous arrows are the flows to ammonium.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4508965&req=5

fig03: Schematic of the BIOMAS ecosystem model [Zhang et al., 2010]. Marked are two phytoplankton components (diatoms, flagellates), three zooplankton components (small zooplankton/microzooplankton, copepods, predator zooplankton), dissolved organic nitrogen (DON), detrital particulate organic nitrogen (detritus), particulate organic silica (opal), nitrate (NO3), ammonium (NH4), and silicate (Si(OH)4). Solid black arrows indicate nitrogen flows and blue arrows indicate silicon flows. The black discontinuous arrows are flows to the dissolved organic matter and the blue discontinuous arrows are the flows to ammonium.
Mentions: [5] BIOMAS is a coupled biophysical model [Zhang et al., 2010] that has three model elements: a sea ice model, an ocean circulation model, and a pelagic biological model. The pelagic biological model is an 11-component marine pelagic ecosystem model that includes two phytoplankton components (diatoms and flagellates), three zooplankton components (microzooplankton, copepods, and predator zooplankton), dissolved organic nitrogen, detrital particulate organic nitrogen, particulate organic silica, nitrate, ammonium, and silicate (Figure 3) [Zhang et al., 2010; also see Kishi et al., 2007]. Values of key biological parameters used in the model are listed in Zhang et al. [2010]. The ocean circulation model is based on the Parallel Ocean Program (POP) developed at Los Alamos National Laboratory [Smith et al., 1992]. The POP ocean model is modified so that open boundary conditions can be specified [Zhang and Steele, 2007]. The sea ice model is a 12 category thickness and enthalpy distribution (TED) sea ice model [Zhang and Rothrock, 2003; Hibler, 1980]. It is adopted from the Pan-arctic Ice/Ocean Modeling and Assimilation System (PIOMAS) [Zhang and Rothrock, 2003].

Bottom Line: In the central PSA, however, model simulations indicate a decrease in PP and plankton biomass.The simulated biological gain on the shelves is greater than the loss in the central PSA, and therefore, the production on average over the entire PSA is increased by the cyclone.The generally positive impact of cyclones on the marine ecosystem in the Arctic, particularly on the shelves, is likely to grow with increasing summer cyclone activity if the Arctic continues to warm and the ice cover continues to shrink.

View Article: PubMed Central - PubMed

Affiliation: Applied Physics Laboratory, University of Washington Seattle, Washington, USA.

ABSTRACT

[1] A coupled biophysical model is used to examine the impact of the great Arctic cyclone of early August 2012 on the marine planktonic ecosystem in the Pacific sector of the Arctic Ocean (PSA). Model results indicate that the cyclone influences the marine planktonic ecosystem by enhancing productivity on the shelves of the Chukchi, East Siberian, and Laptev seas during the storm. Although the cyclone's passage in the PSA lasted only a few days, the simulated biological effects on the shelves last 1 month or longer. At some locations on the shelves, primary productivity (PP) increases by up to 90% and phytoplankton biomass by up to 40% in the wake of the cyclone. The increase in zooplankton biomass is up to 18% on 31 August and remains 10% on 15 September, more than 1 month after the storm. In the central PSA, however, model simulations indicate a decrease in PP and plankton biomass. The biological gain on the shelves and loss in the central PSA are linked to two factors. (1) The cyclone enhances mixing in the upper ocean, which increases nutrient availability in the surface waters of the shelves; enhanced mixing in the central PSA does not increase productivity because nutrients there are mostly depleted through summer draw down by the time of the cyclone's passage. (2) The cyclone also induces divergence, resulting from the cyclone's low-pressure system that drives cyclonic sea ice and upper ocean circulation, which transports more plankton biomass onto the shelves from the central PSA. The simulated biological gain on the shelves is greater than the loss in the central PSA, and therefore, the production on average over the entire PSA is increased by the cyclone. Because the gain on the shelves is offset by the loss in the central PSA, the average increase over the entire PSA is moderate and lasts only about 10 days. The generally positive impact of cyclones on the marine ecosystem in the Arctic, particularly on the shelves, is likely to grow with increasing summer cyclone activity if the Arctic continues to warm and the ice cover continues to shrink.

No MeSH data available.