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\begin{document}

\title{Dissolved Nitrogen Cycling in The Eastern Canadian Arctic Archipelago
and Baffin Bay from Stable Isotopic Data}



\author[1]{Holly C. Westbrook}%
\author[1]{Annie Bourbonnais}%
\author[2]{Cara C M Manning}%
\author[3]{Jean-Eric Tremblay}%
\author[4]{Mohamed Ahmed}%
\author[4]{Brent Gordon Thomas Else}%
\author[5]{Julie Granger}%
\affil[1]{University of South Carolina}%
\affil[2]{University of British Columbia}%
\affil[3]{Laval University}%
\affil[4]{University of Calgary}%
\affil[5]{University of Connecticut}%


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  \date{June 13, 2024}


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\begin{abstract}
Climate change is expected to alter the input of nitrogen (N) sources in
the Eastern Canadian Arctic Archipelago (ECAA) and Baffin Bay due to
increased discharge from glacial meltwater and permafrost thaw. Since
dissolved inorganic N is generally depleted in surface waters, dissolved
organic N (DON) could represent a significant N source fueling
phytoplankton activity in Arctic ecosystems. Yet, few DON data for this
region exist. We measured concentrations and stable isotope ratios (\selectlanguage{greek}δ\selectlanguage{english}15N
and \selectlanguage{greek}δ\selectlanguage{english}18O) of DON and nitrate (NO3-) to investigate the sources and
cycling of dissolved nitrogen in regional rivers and at the sea surface
from samples collected in the ECAA and Baffin Bay during the summer of
2019. The isotopic signatures of NO3- in rivers could be reproduced in a
steady state isotopic model by invoking mixing between atmospheric NO3-
and nitrified ammonium as well as NO3- assimilation by phytoplankton.
DON concentrations were low in most rivers ([?]4.9 \selectlanguage{greek}µ\selectlanguage{english}mol L-1), whereas the
concentrations (0.54--12 \selectlanguage{greek}µ\selectlanguage{english}mol L-1) and \selectlanguage{greek}δ\selectlanguage{english}15N of DON (-0.71--9.6 %0) at the
sea surface were variable among stations, suggesting dynamic cycling
and/or distinctive sources. In two regions with high chl-a, DON
concentrations were inversely correlated with chlorophyll-an and the
d15N of DON, suggesting net DON consumption in localized phytoplankton
blooms. We derived an isotope effect of -6.9%0 for DON consumption. Our
data helps establish a baseline to assess future change in nutrient
regime for this climate sensitive region.%
\end{abstract}%



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