Interannual Variability of Primary Production in the Laptev Sea

Oceanology ◽  
2020 ◽  
Vol 60 (1) ◽  
pp. 50-61 ◽  
Author(s):  
A. B. Demidov ◽  
S. V. Sheberstov ◽  
V. I. Gagarin
Keyword(s):  
Primary Production ◽  
Interannual Variability ◽  
Laptev Sea ◽  
The Laptev Sea

scholarly journals Spatial variability of primary production and chlorophyll in the Laptev sea in august–september

2019 ◽  
Vol 59 (5) ◽  
pp. 755-770
Author(s):  
A. B. Demidov ◽  
V. I. Gagarin ◽  
E. G. Arashkevich ◽  
P. N. Makkaveev ◽  
I. V. Konyukhov ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Spatial Variability ◽  
Primary Production ◽  
Continental Slope ◽  
Incident Radiation ◽  
Laptev Sea ◽  
Phytoplankton Primary Production ◽  
Average Value ◽  
Nutrients Concentration ◽  
The Laptev Sea

Spatial distribution of phytoplankton primary production and chlorophyll was studied based on the data of three cruises carried out in AugustSeptember of 2015, 2017 and 2018. The average value of water column primary production (IPP) along the transect from Lena`s mouth to the continental slope was 2.8 fold higher than that one along the transect from Khatanga`s mouth, which was explained by the level of incident radiation and nutrients concentration. Along the cross-slope transects increasing of photosynthetically layer integrated chlorophyll (Chlph) occurred due to developing of deep maxima. IPP and Chlph increasing was registered in the vicinity of the continental slope. In AugustSeptember the averaged IPP value was 100 mgC m-2 d-1 that is the evidence of oligotrophy of the Laptev Sea at the end of summer and at the beginning of autumn.

Vertical Variability of Primary Production and Features of the Subsurface Chlorophyll Maximum in the Laptev Sea in August–September, 2015, 2017, and 2018

Oceanology ◽  
2020 ◽  
Vol 60 (2) ◽  
pp. 189-204
Author(s):  
A. B. Demidov ◽  
V. I. Gagarin ◽  
V. A. Artemiev ◽  
E. G. Arashkevich ◽  
P. N. Makkaveev ◽  
...  
Keyword(s):  
Primary Production ◽  
Laptev Sea ◽  
Chlorophyll Maximum ◽  
Subsurface Chlorophyll Maximum ◽  
The Laptev Sea ◽  
Vertical Variability

scholarly journals Interannual variability of surface and bottom sediment transport on the Laptev Sea shelf during summer

2013 ◽  
Vol 10 (2) ◽  
pp. 1117-1129 ◽  
Author(s):  
C. Wegner ◽  
D. Bauch ◽  
J. A. Hölemann ◽  
M. A. Janout ◽  
B. Heim ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Interannual Variability ◽  
Water Column ◽  
Atmospheric Circulation ◽  
Surface Waters ◽  
Laptev Sea ◽  
Nepheloid Layer ◽  
Transport Dynamics ◽  
Spm Concentration ◽  
The Laptev Sea

Abstract. Sediment transport dynamics were studied during ice-free conditions under different atmospheric circulation regimes on the Laptev Sea shelf (Siberian Arctic). To study the interannual variability of suspended particulate matter (SPM) dynamics and their coupling with the variability in surface river water distribution on the Laptev Sea shelf, detailed oceanographic, optical (turbidity and Ocean Color satellite data), and hydrochemical (nutrients, SPM, stable oxygen isotopes) process studies were carried out continuously during the summers of 2007 and 2008. Thus, for the first time SPM and nutrient variations on the Laptev Sea shelf under different atmospheric forcing and the implications for the turbidity and transparency of the water column can be presented. The data indicate a clear link between different surface distributions of riverine waters and the SPM transport dynamics within the entire water column. The summer of 2007 was dominated by shoreward winds and an eastward transport of riverine surface waters. The surface SPM concentration on the southeastern inner shelf was elevated, which led to decreased transmissivity and increased light absorption. Surface SPM concentrations in the central and northern Laptev Sea were comparatively low. However, the SPM transport and concentration within the bottom nepheloid layer increased considerably on the entire eastern shelf. The summer of 2008 was dominated by offshore winds and northward transport of the river plume. The surface SPM transport was enhanced and extended onto the mid-shelf, whereas the bottom SPM transport and concentration was diminished. This study suggests that the SPM concentration and transport, in both the surface and bottom nepheloid layers, are associated with the distribution of riverine surface waters which are linked to the atmospheric circulation patterns over the Laptev Sea and the adjacent Arctic Ocean during the open water season. A continuing trend toward shoreward winds, weaker stratification and higher SPM concentration throughout the water column might have severe consequences for the ecosystem on the Laptev Sea shelf.

scholarly journals Interannual variability of surface and bottom sediment transport on the Laptev Sea shelf during summer

2012 ◽  
Vol 9 (9) ◽  
pp. 13053-13084 ◽  
Author(s):  
C. Wegner ◽  
D. Bauch ◽  
J. A. Hölemann ◽  
M. A. Janout ◽  
B. Heim ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Interannual Variability ◽  
Water Column ◽  
Atmospheric Circulation ◽  
Surface Waters ◽  
Laptev Sea ◽  
Nepheloid Layer ◽  
Transport Dynamics ◽  
Spm Concentration ◽  
The Laptev Sea

Abstract. Sediment transport dynamics were studied during ice-free conditions under different atmospheric circulation regimes on the Laptev Sea shelf (Siberian Arctic). To study the interannual variability of suspended particulate matter (SPM) dynamics and their coupling with the variability in surface river water distribution on the Laptev Sea detailed oceanographic, optical (turbidity and Ocean Color satellite data), and hydrochemical (nutrients, SPM, stable oxygen isotopes) process studies were carried out continuously during the summers of 2007 and 2008. Thus, for the first time SPM and nutrient variations on the Laptev Sea shelf under different atmospheric forcing and the implications for the turbidity and transparency of the water column can be presented. The data indicate a clear link between different surface distributions of riverine waters and the SPM transport dynamics within the entire water column. The summer of 2007 was dominated by shoreward winds and an eastward transport of riverine surface waters. The surface SPM concentration on the south-eastern inner shelf was elevated, which led to decreased transmissivity and increased light absorption. Surface SPM concentrations in the Central and Northern Laptev Sea were comparatively low. However, the SPM transport and concentration within the bottom nepheloid layer increased considerably on the entire eastern shelf. The summer of 2008 was dominated by offshore-winds and northwards transport of the river plume. The surface SPM transport was enhanced and extended onto the mid-shelf whereas the bottom SPM transport and concentration was diminished. This study suggests that the SPM concentration and transport in both, the surface and bottom nepheloid layers, are associated with the distribution of riverine surface waters which are linked to the atmospheric circulation patterns over the Laptev Sea and the adjacent Arctic Ocean during open water season. A continuing trend toward shoreward winds, weaker stratification and higher SPM concentration throughout the water column might have severe consequences for the ecosystem on the Laptev Sea shelf.

Chlorophyll, primary production, fluxes, and balance of organic carbon in the Laptev Sea

2008 ◽  
Vol 46 (10) ◽  
pp. 1055-1063 ◽  
Author(s):  
A. A. Vetrov ◽  
E. A. Romankevich ◽  
N. A. Belyaev
Keyword(s):  
Organic Carbon ◽  
Primary Production ◽  
Laptev Sea ◽  
The Laptev Sea

Spatial Variability of Primary Production and Chlorophyll in the Laptev Sea in August–September

Oceanology ◽  
2019 ◽  
Vol 59 (5) ◽  
pp. 678-691
Author(s):  
A. B. Demidov ◽  
V. I. Gagarin ◽  
E. G. Arashkevich ◽  
P. N. Makkaveev ◽  
I. V. Konyukhov ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Primary Production ◽  
Laptev Sea ◽  
The Laptev Sea

scholarly journals On the Variability of Stratification in the Freshwater-Influenced Laptev Sea Region

2020 ◽  
Vol 7 ◽  
Author(s):  
Markus A. Janout ◽  
Jens Hölemann ◽  
Georgi Laukert ◽  
Alexander Smirnov ◽  
Thomas Krumpen ◽  
...  
Keyword(s):  
Sea Ice ◽  
Interannual Variability ◽  
Water Column ◽  
River Water ◽  
Heat Storage ◽  
Mixed Layer Depth ◽  
Laptev Sea ◽  
Layer Depth ◽  
Freshwater Influence ◽  
The Laptev Sea

In this paper, we investigate the seasonal and spatial variability of stratification on the Siberian shelves with a case study from the Laptev Sea based on shipboard hydrographic measurements, year-round oceanographic mooring records from 2013 to 2014 and chemical tracer-based water mass analyses. In summer 2013, weak onshore-directed winds caused spreading of riverine waters throughout much of the eastern and central shelf. In contrast, strong southerly winds in summer 2014 diverted much of the freshwater to the northeast, which resulted in 50% less river water and significantly weaker stratification on the central shelf compared with the previous year. Our year-long records additionally emphasize the regional differences in water column structure and stratification, where the northwest location was well-mixed for 6 months and the central and northeast locations remained stratified into spring due to the lower initial surface salinities of the river-influenced water. A 26 year record of ocean reanalysis highlights the region’s interannual variability of stratification and its dependence on winds and sea ice. Prior the mid-2000s, river runoff to the perennially ice-covered central Laptev Sea shelf experienced little surface forcing and river water was maintained on the shelf. The transition toward less summer sea ice after the mid-2000s increased the ROFI’s (region of freshwater influence) exposure to summer winds. This greatly enhanced the variability in mixed layer depth, resulting in several years with well-mixed water columns as opposed to the often year-round shallow mixed layers before. The extent of the Lena River plume is critical for the region since it modulates nutrient fluxes and primary production, and further controls intermediate heat storage induced by lateral density gradients, which has implications for autumnal freeze-up and the eastern Arctic sea ice volume.MAIN POINTS1.CTD surveys and moorings highlight the regional and temporal variations in water column stratification on the Laptev Sea shelf.2.Summer winds increasingly control the extent of the region of freshwater influence under decreasing sea ice.3.Further reductions in sea ice increases surface warming, heat storage, and the interannual variability in mixed layer depth.

Sign in / Sign up

Export Citation Format

Share Document