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<p>Arctic carbon (C) budgets typically exclude estuarine and coastal CO<sub>2</sub> dynamics despite evidence that these systems can be a source of atmospheric CO<sub>2</sub>, unlike the shelf waters and the open ocean. High frequency measurements of Arctic coastal <i>p</i>CO<sub>2</sub> are limited but needed to understand C cycling responses to interacting influences of terrestrial and oceanic inputs. We measured continuous <i>p</i>CO<sub>2</sub> and estimated CO<sub>2</sub> fluxes during three open water seasons at five sites across an Arctic estuary, including three shallow sites (≤ 1&#xa0;m), and two deep sites (&gt; 2&#xa0;m). During the open water season, wind-driven currents controlled the distribution of terrestrial and marine materials, which influenced spatial and temporal patterns - both daily and interannual - in lagoon water quality. Lagoon waters generally had undersaturated <i>p</i>CO₂ relative to the atmosphere, particularly at the deeper sites. <i>p</i>CO₂ increased or reached saturation at all sites when wind-driven circulation enhanced terrestrial influence that led to warmer, fresher conditions with elevated light attenuation and higher apparent oxygen utilization. On average, two shallow sites were sources of CO<sub>2</sub> to the atmosphere, potentially due to their proximity to eroding coastal bluffs, inputs from an intermediate-sized river, and wind driven resuspension events. Continuous measurements and high spatial coverage are important to detect and scale CO<sub>2</sub> fluxes across the open water season in the Arctic nearshore zone, especially those draining understudied, smaller watersheds.</p>

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Wind-driven Circulation Impacts Water Quality and pCO2 Over an Estuarine Gradient in an Arctic Lagoon

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Alina Spera,
  • Sasha Peterson,
  • Craig Tweedie,
  • Vanessa Lougheed

摘要

Arctic carbon (C) budgets typically exclude estuarine and coastal CO2 dynamics despite evidence that these systems can be a source of atmospheric CO2, unlike the shelf waters and the open ocean. High frequency measurements of Arctic coastal pCO2 are limited but needed to understand C cycling responses to interacting influences of terrestrial and oceanic inputs. We measured continuous pCO2 and estimated CO2 fluxes during three open water seasons at five sites across an Arctic estuary, including three shallow sites (≤ 1 m), and two deep sites (> 2 m). During the open water season, wind-driven currents controlled the distribution of terrestrial and marine materials, which influenced spatial and temporal patterns - both daily and interannual - in lagoon water quality. Lagoon waters generally had undersaturated pCO₂ relative to the atmosphere, particularly at the deeper sites. pCO₂ increased or reached saturation at all sites when wind-driven circulation enhanced terrestrial influence that led to warmer, fresher conditions with elevated light attenuation and higher apparent oxygen utilization. On average, two shallow sites were sources of CO2 to the atmosphere, potentially due to their proximity to eroding coastal bluffs, inputs from an intermediate-sized river, and wind driven resuspension events. Continuous measurements and high spatial coverage are important to detect and scale CO2 fluxes across the open water season in the Arctic nearshore zone, especially those draining understudied, smaller watersheds.