Input of organic carbon as determinant of nutrient fluxes, light climate and productivity in the Ob and Yenisey estuaries

Hessen, Dag O.; Carroll, JoLynn; Kjeldstad, Berit; Korosov, Anton; Pettersson, Lasse H.; Pozdnyakov, Dmitry; Sørensen, Kai

doi:10.1016/j.ecss.2010.03.006

Cited by 71 publications

(41 citation statements)

References 36 publications

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“…The samples taken from the Kurungnakh river arm were not significantly different from the major river. These values match the data of Hessen et al (2010) for the Ob (0.4-3.4 mg m −3 ) and Yenisei (0.6-2.9 mg m −3 ). Chlorophyll values derived from satellite data are in most cases overestimated due to the difficult separation between CDOM and phytoplankton pigment absorption spectra (Heim et al, this volume).…”

Section: Discussionsupporting

confidence: 76%

“…The DOC concentrations of Ob and Yenisei, close to their mouths, where river water is not diluted by marine water, is in the range of 5-10 g C m −3 with extreme values of 15 g C m −3 . The concentrations in the Kara Sea, where salinity exceeds 30 ppt, is < 1 g C m −3 (Korosov et al, 2011), also reported by Hessen et al (2010) found during our campaign in the fresh water region of the Lena were rather constant with a range of 8.5-10.5 g C m −3 . When including the measurements of August 2011 at the same stations with a mean of 4.6 ± 0.46 g m −3 , we found almost the same range of DOC as reported for the Ob and Yenisei whereby even our extreme values of 16 g C m −3 agree.…”

Section: Discussionmentioning

confidence: 49%

“…The main sources of total suspended matter (TSM) are eroded land and the thawing permafrost (Rachold et al, 1996;Lobbes et al, 2000). Similar studies in the Kara Sea about optical properties, remote sensing, and carbon content were carried out by Pozdnyakov et al (2005), Hessen et al (2010), and Korosov et al (2011).…”

Section: Introductionmentioning

confidence: 52%

“…The absorption coefficients of CDOM are easier to compare. In the paper of Hessen et al (2010) the downwelling irradiance attenuation coefficient k d is included for some wavelengths in the ultraviolet (UV) spectral range, which are around 10 m −1 for 380 nm for the Ob and Yenisei. Since for highly absorbing water, k d is mainly determined by the absorption coefficient, it can be transferred to an absorption coefficient of 4 m −1 at 442 nm assuming a spectral slope of 0.015.…”

Section: Discussionmentioning

confidence: 99%

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Contribution to a bio-optical model for remote sensing of Lena River water

et al. 2013

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Abstract. Bio-optical measurements and sampling were carried out in the delta of the Lena River (northern Siberia, Russia) between 26 June and 4 July 2011. The aim of this study was to determine the inherent optical properties of the Lena water, i.e., absorption, attenuation, and scattering coefficients, during the period of maximum runoff. This aimed to contribute to the development of a biooptical model for use as the basis for optical remote sensing of coastal water of the Arctic. In this context the absorption by CDOM (colored dissolved organic matter) and particles, and the concentrations of total suspended matter, phytoplankton-pigments, and carbon were measured. CDOM was found to be the most dominant parameter affecting the optical properties of the river, with an absorption coefficient of 4.5-5 m −1 at 442 nm, which was almost four times higher than total particle absorption values at visible wavelength range. The wavelenght-dependence of absorption of the different water constituents was chracterized by determining the semi logarithmic spectral slope. Mean CDOM, and detritus slopes were 0.0149 nm −1 (standard deviation (stdev) = 0.0003, n = 18), and 0.0057 nm −1 (stdev = 0.0017, n = 19), respectively, values which are typical for water bodies with high concentrations of dissolved and particulate carbon. Mean chlorophyll a and total suspended matter were 1.8 mg m −3 (stdev = 0.734 n = 18) and 31.9 g m −3 (stdev = 19.94, n = 27), respectively. DOC (dissolved organic carbon) was in the range 8-10 g m −3 and the total particulate carbon (PC) in the range 0.25-1.5 g m −3 . The light penetration depth (Secchi disc depth) was in the range 30-90 cm and was highly correlated with the suspended matter concentration. The period of maximum river runoff in June was chosen to obtain bio-optical data when maximum water constituents are transported into the Laptev Sea. However, we are aware that more data from other seasons and other years need to be collected to establish a general bio-optical model of the Lena water and conclusively characterize the light climate with respect to primary production.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 99%

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Contribution to a bio-optical model for remote sensing of Lena River water

et al. 2013

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“…Riverine ADOM delivers, among others, organic carbon, inorganic 15 nitrogen and phosphorus, iron, and silicates. Riverine particulate (seston) content in discharging waters is high (Hessen et al, 2010). However, not all studies on chemical riverine budgets include data from the spring high-flow period.…”

Section: Linkages Between the Marine Arctic And Eurasian Continentmentioning

confidence: 99%

Towards the Marine Arctic Component of the Pan-Eurasian Experiment

Vihma

Uotila

Sandven³

et al. 2018

Preprint

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Abstract. The Arctic marine climate system is changing rapidly, seen as warming of the ocean and atmosphere, decline of sea ice cover, increase in river discharge, acidification of the ocean, and changes in marine ecosystems. Socio-economic activities 20 in the coastal and marine Arctic are simultaneously changing. This calls for establishment of a marine Arctic component of the Pan-Eurasian Experiment (MA-PEEX). There is a need for more in-situ observations on the marine atmosphere, sea ice, and ocean, but increasing the amount of such observations is a pronounced technological and logistical challenge. The SMEAR (Station Measuring Ecosystem-Atmosphere Relations) concept can be applied in coastal and archipelago stations, but in the Arctic Ocean it will probably be more cost-effective to further develop a strongly distributed marine observation network 25 based on autonomous buoys, moorings, Autonomous Underwater Vehicles (AUV), and Unmanned Aerial Vehicles (UAV).These have to be supported by research vessel and aircraft campaigns, as well as various coastal observations, including community-based ones. Major manned drifting stations may occasionally serve comparable to terrestrial SMEAR Flagship stations. To best utilize the observations, atmosphere-ocean reanalyses need to be further developed. To well integrate MA-PEEX with the existing terrestrial/atmospheric PEEX, focus is needed on the river discharge and associated fluxes, coastal 30 processes, as well as atmospheric transports in and out of the marine Arctic. More observations and research are also needed on the specific socio-economic challenges and opportunities in the marine and coastal Arctic, and on their interaction with changes in the climate and environmental system. MA-PEEX will promote international collaboration, sustainable marine Atmos. Chem. Phys. Discuss., https://doi

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Tracing terrestrial DOC in the Baltic Sea—A 3‐D model study

Fransner

Nycander

Mörth

et al. 2016

Global Biogeochemical Cycles

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The fate of terrestrial organic matter brought to the coastal seas by rivers and its role in the global carbon cycle are still not very well known. Here the degradation rate of terrestrial dissolved organic carbon (DOCter) is studied in the Baltic Sea, a subarctic semienclosed sea, by releasing it as a tracer in a 3‐D circulation model and applying linear decay constants. A good agreement with available observational data is obtained by parameterizing the degradation in two rather different ways: one by applying a decay time on the order of 10 years to the whole pool of DOCter and one by dividing the DOCter into one refractory pool and one pool subject to a decay time on the order of 1 year. The choice of parameterization has a significant effect on where in the Baltic Sea the removal takes place, which can be of importance when modeling the full carbon cycle and the CO2 exchange with the atmosphere. In both cases the biogeochemical decay operates on time scales less than the water residence time. Therefore, only a minor fraction of the DOCter reaches the North Sea, whereas approximately 80% is removed by internal sinks within the Baltic Sea. This further implies that DOCter mineralization is an important link in land‐sea‐atmosphere cycling of carbon in coastal and shelf seas that are heavily influenced by riverine DOC.

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Input of organic carbon as determinant of nutrient fluxes, light climate and productivity in the Ob and Yenisey estuaries

Cited by 71 publications

References 36 publications

Contribution to a bio-optical model for remote sensing of Lena River water

Contribution to a bio-optical model for remote sensing of Lena River water

Towards the Marine Arctic Component of the Pan-Eurasian Experiment

Tracing terrestrial DOC in the Baltic Sea—A 3‐D model study

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