High-Resolution Sensors Reveal Nitrate and Dissolved Silica Dynamics in an Arctic Fjord
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10501554" target="_blank" >RIV/00216208:11310/25:10501554 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=h.yT~bFadp" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=h.yT~bFadp</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2024JG008523" target="_blank" >10.1029/2024JG008523</a>
Alternative languages
Result language
angličtina
Original language name
High-Resolution Sensors Reveal Nitrate and Dissolved Silica Dynamics in an Arctic Fjord
Original language description
Subglacial weathering releases biologically important nutrients into meltwaters that have the potential to influence downstream ecosystems. There is a need to understand how accelerated glacial retreat could impact biogeochemical cycling in coastal regions in the near future. However, fjords - important gateways connecting the Greenland ice sheet and coastal oceans - are highly heterogeneous environments both in space and time. Here, we investigate temporal variability of nutrient dynamics in a glacier-fed fjord (Nuup Kangerlua, Greenland) using a high resolution record of nitrate + nitrite (ΣNO(x)) and dissolved silica (DSi), coupled with temperature and salinity, using submersible in situ sensors. During a 3-month monitoring period (14th June to 13 September 2019), ΣNO(x) varied between 0.05 and 10.07 μM (+/- 0.2 μM), whereas DSi varied between 0.35 and 14.98 μM (+/- 0.5 μM). Both nutrients started low (following the spring bloom) and increased throughout the monitoring period. Several large peaks in both nutrients were observed, and these can largely be associated with meltwater runoff and upwelling events. Peaks in DSi were likely the direct result of glacial meltwater pulses, whereas elevated ΣNO(x) concentrations in the fjord system were likely the result of meltwater-induced upwelling of marine sources. However, we did not observe a case of simple conservative mixing, suggesting that other processes in the fjord system (e.g., differential biological uptake and remineralization) may decouple the relationship between the two nutrients. This data set was used to investigate the biogeochemical impact of changes in glacier meltwater input throughout the melt season.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Geophysical Research-Biogeosciences
ISSN
2169-8953
e-ISSN
2169-8961
Volume of the periodical
130
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
e2024JG008523
UT code for WoS article
001436953400001
EID of the result in the Scopus database
2-s2.0-86000075162