Vertical distribution of nutrient tracers in the western Arctic Ocean and its relationship to water structure and biogeochemical processes

2020 ◽  
Vol 39 (9) ◽  
pp. 109-114
Author(s):  
Yanpei Zhuang ◽  
Hongliang Li ◽  
Haiyan Jin ◽  
Shengquan Gao ◽  
Jianfang Chen ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Arctic Ocean ◽  
Water Structure ◽  
Biogeochemical Processes ◽  
Western Arctic Ocean ◽  
Western Arctic

scholarly journals Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean

Polar Science ◽  
2020 ◽  
Vol 23 ◽  
pp. 100504
Author(s):  
Di Qi ◽  
Baoshan Chen ◽  
Liqi Chen ◽  
Hongmei Lin ◽  
Zhongyong Gao ◽  
...  
Keyword(s):  
Sea Ice ◽  
Arctic Ocean ◽  
Biogeochemical Processes ◽  
Western Arctic Ocean ◽  
Ice Melt ◽  
Western Arctic ◽  
Coastal Acidification

Summer N₂O dynamics in the western Arctic Ocean : Distributions, Processes, and Fluxes

2020 ◽  
Author(s):  
Seong-Su Kim ◽  
Sung-Ho Kang ◽  
Eun Jin Yang ◽  
Il-Nam Kim
Keyword(s):  
Arctic Ocean ◽  
Positive Relationship ◽  
Chukchi Sea ◽  
Negative Relationship ◽  
The Arctic ◽  
Biogeochemical Processes ◽  
High Solubility ◽  
Western Arctic Ocean ◽  
Western Arctic ◽  
Relationship Of

<p>We collect seawater samples from 32 stations for N<sub>2</sub>O analysis between August 6 and August 25, during 2017 ARA08B cruise in western Arctic Ocean (WAO), covering from Southern Chukchi Sea (SC) to Northern Chukchi Sea (NC). At surface depth (~50 m), N<sub>2</sub>O concentrations were 10.9‒19.4 nmol L<sup>-1</sup>, and distinct pattern was observed between SC and NC. N<sub>2</sub>O concentrations were increased from surface to bottom (~50 m) at SC, corresponding to positive relationship of ∆N<sub>2</sub>O (N<sub>2</sub>O<sub>measured </sub>- N<sub>2</sub>O<sub>equilibrium</sub>) with DIN (NO<sub>3­</sub><sup>-</sup> + NO<sub>2</sub><sup>-</sup>) and negative relationship between ∆N<sub>2</sub>O and N<sup>*</sup>. It suggests that nitrification and denitrification are the main processes to produce N<sub>2</sub>O at SC. On the other hand, N<sub>2</sub>O concentration at NC increased from the south to north, and remained vertically constant. It may be the result of physical processes such as dilution by sea ice melting water, and high solubility that affected by low temperature and low salinity. The highest N<sub>2</sub>O concentrations were observed at intermediate depth (50‒200 m), ranging 13.4‒21.9 nmol L<sup>-1</sup>. It would be determined by high solubility and active biogeochemical processes synthetically. Concentrations of N<sub>2</sub>O were rapidly diminished to 400 m, ranging 10.2‒14.1 nmol L<sup>-1</sup>, and did not be remarkably altered under 400 m, ranging 11.3‒13.7 nmol L<sup>-1</sup>. It might be affected by advection of Atlantic Water (AW) and existence of Arctic Bottom Water (ABW), and influence of biogeochemical processes was negligible at deep and bottom depth (below 200 m). N<sub>2</sub>O flux was calculated to determine that the WAO is sources or sinks region for atmospheric N<sub>2</sub>O. Positive N<sub>2</sub>O flux was observed at SC, and it indicate that N<sub>2</sub>O gas is released to atmosphere at SC. Negative value of N<sub>2</sub>O flux at NC suggest that atmospheric N<sub>2</sub>O is absorbed into NC. Furthermore, positive relationship of N<sub>2</sub>O flux with environmental parameters (temperature, salinity, and ∆N<sub>2</sub>O) also observed in WAO. These results provide comprehensive information of the spatial N<sub>2</sub>O distribution and main processes which decide N<sub>2</sub>O distribution in WAO, and also suggest that air-sea N<sub>2</sub>O flux could be affected by changing environments of the Arctic Ocean.</p>

scholarly journals Vertical distribution, population structure and developmental characteristics of the less studied but globally distributed mesopelagic copepod Scaphocalanus magnus in the western Arctic Ocean

2020 ◽  
Vol 42 (3) ◽  
pp. 368-377
Author(s):  
Atsushi Yamaguchi ◽  
Carin J Ashjian ◽  
Robert G Campbell ◽  
Yoshiyuki Abe
Keyword(s):  
Vertical Distribution ◽  
Arctic Ocean ◽  
Adult Males ◽  
Polar Night ◽  
Western Arctic Ocean ◽  
Worldwide Distribution ◽  
Body Sizes ◽  
Western Arctic ◽  
Particle Feeding ◽  
Developmental Characteristics

Abstract Scaphocalanus magnus is a large copepod species with a worldwide distribution. Information on the ecology of this species is scarce. In this study, S. magnus was collected using vertically stratified net sampling from an ice station in the western Arctic Ocean over a year. The vertical distribution differed between periods of polar night and midnight sun, with core depth distributions of 264–381 m for the polar night and 518–745 m for the midnight sun. The shallower distribution during the polar night may have resulted from the animals moving upwards to find sufficient food during the less productive season. The abundance of early copepodite stages showed clear seasonality. The C2 and C3 stages were abundant June–August and August–September, respectively. After C4, seasonality in abundance was not clear. For C4 and C5, body sizes and masses were greater for males than for females while the opposite was the case for C6. Adult males do not feed and thus have shorter life spans than females, skewing the adult sex ratio towards females. For these mesopelagic particle feeding copepods, a long residence time at C6F suggests that in a varying food environment, it is possible to wait to initiate reproduction until favourable food conditions occur.

Horizontal and vertical distribution of polycystine radiolarians in the western Arctic Ocean during the late summers of 2013 and 2015

Polar Biology ◽  
2018 ◽  
Vol 42 (2) ◽  
pp. 285-305 ◽  
Author(s):  
Takahito Ikenoue ◽  
Kjell R. Bjørklund ◽  
Amane Fujiwara ◽  
Mario Uchimiya ◽  
Katsunori Kimoto ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Arctic Ocean ◽  
Western Arctic Ocean ◽  
Western Arctic ◽  
Horizontal And Vertical Distribution

scholarly journals N2O dynamics in the western Arctic Ocean during the summer of 2017

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jang-Mu Heo ◽  
Seong-Su Kim ◽  
Sung-Ho Kang ◽  
Eun Jin Yang ◽  
Ki-Tae Park ◽  
...  
Keyword(s):  
Arctic Ocean ◽  
Environmental Changes ◽  
Chukchi Sea ◽  
Hot Spot ◽  
Open Water ◽  
Northern Region ◽  
The Arctic ◽  
Western Arctic Ocean ◽  
Deep Layers ◽  
Western Arctic

AbstractThe western Arctic Ocean (WAO) has experienced increased heat transport into the region, sea-ice reduction, and changes to the WAO nitrous oxide (N2O) cycles from greenhouse gases. We investigated WAO N2O dynamics through an intensive and precise N2O survey during the open-water season of summer 2017. The effects of physical processes (i.e., solubility and advection) were dominant in both the surface (0–50 m) and deep layers (200–2200 m) of the northern Chukchi Sea with an under-saturation of N2O. By contrast, both the surface layer (0–50 m) of the southern Chukchi Sea and the intermediate (50–200 m) layer of the northern Chukchi Sea were significantly influenced by biogeochemically derived N2O production (i.e., through nitrification), with N2O over-saturation. During summer 2017, the southern region acted as a source of atmospheric N2O (mean: + 2.3 ± 2.7 μmol N2O m−2 day−1), whereas the northern region acted as a sink (mean − 1.3 ± 1.5 μmol N2O m−2 day−1). If Arctic environmental changes continue to accelerate and consequently drive the productivity of the Arctic Ocean, the WAO may become a N2O “hot spot”, and therefore, a key region requiring continued observations to both understand N2O dynamics and possibly predict their future changes.

Mesozooplankton prey preference and grazing impact in the western Arctic Ocean

2009 ◽  
Vol 56 (17) ◽  
pp. 1274-1289 ◽  
Author(s):  
Robert G. Campbell ◽  
Evelyn B. Sherr ◽  
Carin J. Ashjian ◽  
Stéphane Plourde ◽  
Barry F. Sherr ◽  
...  
Keyword(s):  
Arctic Ocean ◽  
Prey Preference ◽  
Grazing Impact ◽  
Western Arctic Ocean ◽  
Western Arctic
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