Pelagic primary production during summer along 65 to 72°N off West Greenland

Jensen, Hans Mose; Pedersen, L; Burmeister, A.; Hansen, Benni Winding

doi:10.1007/s003000050362

Cited by 35 publications

(27 citation statements)

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“…Based on observations derived from in situ fluorescence profiles calibrated by laboratory analysis (R 2 = 0.70), Chl a concentrations (> 10 µg L −1 ) were higher in the Vaigat, whereas lower concentrations were measured in Uummannaq Fjord and Disko Bay. Chl a concentrations derived from satellite imagery in July-August 2012 (http://oceancolor.gsfc.nasa.gov/cms/; last access: 29 April 2015) were similar to values reported here, and are also similar to data previously collected from the Vaigat in August 1993 (Jensen et al, 1999). These reports indicate that higher amounts of phytoplankton biomass occur in the Vaigat during this time of the year, but Uummannaq Fjord and Disko Bay have comparatively low levels of biomass accumulation.…”

Section: Comparison Of Uummannaq Fjord and Vaigat-disko Baysupporting

confidence: 87%

Bio-optical characterization and light availability parameterization in Uummannaq Fjord and Vaigat–Disko Bay (West Greenland)

Holinde

2016

Ocean Sci.

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Abstract. This study investigated the bio-optical conditions of Uummannaq Fjord and Vaigat-Disko Bay, two neighboring, semi-enclosed coastal systems in West Greenland. Though close to each other, the systems differ in their hydrographic structure influencing the bio-optical conditions and, subsequently, the biological activities. Both systems showed high inorganic suspended particulate matter (SPMi) concentrations near river runoff or meltwater influxes (max. of 15.28 mg L −1 at the surface) and low colored dissolved organic matter (aCDOM@350nm, < 1.50 m −1 ) abundance throughout the systems. High chlorophyll levels (as an indicator of phytoplankton biomass) were measured in the Vaigat (max. of 11.44 µg L −1 ), which represents the outflow arm of Disko Bay. Light penetration depth as indicated by the 1 % depth of photosynthetically available radiation (PAR) was dominated by chlorophyll and SPMi alike, ranging from 12.2 to 41.2 m. Based on these characteristics, an effective twocomponent parameterization for the diffuse attenuation coefficient k PAR was developed in order to model light penetration depth as a relevant factor for bio-optical studies in Arctic environments under glacial meltwater influence.

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Section: Comparison Of Uummannaq Fjord and Vaigat-disko Baysupporting

confidence: 87%

Bio-optical characterization and light availability parameterization in Uummannaq Fjord and Vaigat–Disko Bay (West Greenland)

Holinde

2016

Ocean Sci.

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“…On the shelf and in the marginal ice zone of the Weddell Sea, Southern Ocean, the highest reported values are 2.6 g C m -2 d -1 (Park et al 1999). In the West Greenland Sea, a value of 3.2 g C m -2 d -1 was reported for the summer 1993 (Jensen et al 1999). Both production and biomass of P POC are dominated by large phytoplankton, as shown in Eqs.…”

Section: Differential Responses Of Pmentioning

confidence: 89%

Phytoplankton production in the North Water Polynya: size-fractions and carbon fluxes, April to July 1998

Mei¹,

Legendre²,

Gratton³

et al. 2003

Mar. Ecol. Prog. Ser.

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“…One hypothesis could simply be that reduced vertical mixing, and increased retention time of algal cells in the photic zone, allows a build-up of phytoplankton biomass at the sampling station, resulting in an increase in total primary production (e.g. Nielsen & Hansen 1995, Jensen et al 1999. However, nutrient levels remained relatively constant during summer.…”

Section: Phase Iii: Glacial Freshwater Discharge Triggers the Summer mentioning

confidence: 99%

“…Primary production estimates from West Greenland coastal waters (26 to 500 g C m ; Steeman-Nielsen 1975, Smidt 1979, Andersen 1981, Jensen et al 1999, Levinsen & Nielsen 2002 for Arctic Shelves, Atlantic Sector and Bering Shelf, respectively). Primary production in high-latitude waters is mainly driven by phytoplankton, while seaice algae may be of seasonal importance in areas experiencing seasonal sea ice (<1 − 66% of total marine primary production; Legendre et al 1992, Rysgaard & Glud 2007 and benthic algae and macroalgae may contribute significantly or even dominate primary production in shallow areas within the pho -tic zone (Glud et al 2002, Krause-Jensen et al 2007, Attard et al 2014.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and interannual phytoplankton production in a sub-Arctic tidewater outlet glacier fjord, SW Greenland

Juul-Pedersen¹,

Arendt²,

Mortensen³

et al. 2015

Mar. Ecol. Prog. Ser.

104

167

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This study describes seasonal patterns and proposes likely drivers of an unusual phytoplankton primary production pattern in the outer-sill region of a tidewater outlet glacierinfluenced fjord (Godthåbsfjord) in SW Greenland. It is based on monthly measurements of pelagic primary production and hydrographic conditions during a 7 yr period. Total annual primary production during 2005 to 2012 was between 84.6 and 139.1 g C m −2 yr −1. Two phytoplankton blooms of similar magnitude reoccur in the fjord every year. A 'classical' spring bloom of up to 1743 mg C m −2 d −1 occurred in late April/early May in a water column almost fully mixed due to tidal forces at the fjord sill. After the spring bloom, primary production decreased in June, after which a summer bloom of up to 1383 mg C m −2 d −1 built up. This bloom coincided with the development of a pycnocline caused by substantial runoff from the Greenland Ice Sheet every year during midsummer. This observation supports a hypothesis that fjord circulation modes and subglacial freshwater discharge, leading to upwelling of nutrient rich water, stimulate primary production in the fjord. Future changes in the timing or magnitude of meltwater runoff from the Greenland Ice Sheet are thus likely to affect phytoplankton dynamics in the fjord.

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Pelagic primary production during summer along 65 to 72°N off West Greenland

Cited by 35 publications

References 0 publications

Bio-optical characterization and light availability parameterization in Uummannaq Fjord and Vaigat–Disko Bay (West Greenland)

Bio-optical characterization and light availability parameterization in Uummannaq Fjord and Vaigat–Disko Bay (West Greenland)

Phytoplankton production in the North Water Polynya: size-fractions and carbon fluxes, April to July 1998

Seasonal and interannual phytoplankton production in a sub-Arctic tidewater outlet glacier fjord, SW Greenland

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