DMS emissions from the Arctic marginal ice zone
Bibliographic Data
Phytoplankton blooms in the Arctic marginal ice zone (MIZ) can be prolific dimethylsulfide (DMS) producers, thereby influencing regional aerosol formation and cloud radiative forcing. Here we describe the distribution of DMS and its precursor dimethylsulfoniopropionate (DMSP) across the Baffin Bay receding ice edge in early summer 2016. Overall, DMS and total DMSP (DMSPt) increased towards warmer waters of Atlantic origin concurrently with more advanced ice-melt and bloom stages. Relatively high DMS and DMSPt (medians of 6.3 and 70 nM, respectively) were observed in the surface layer (0–9 m depth), and very high values (reaching 74 and 524 nM, respectively) at the subsurface biomass maximum (15–30 m depth). Microscopic and pigment analyses indicated that subsurface DMS and DMSPt peaks were associated with Phaeocystis pouchetii, which bloomed in Atlantic-influenced waters and reached unprecedented biomass levels in Baffin Bay. In surface waters, DMS concentrations and DMS:DMSPt ratios were higher in the MIZ (medians of 12 nM and 0.15, respectively) than in fully ice-covered or ice-free conditions, potentially associated with enhanced phytoplanktonic DMSP release and bacterial DMSP cleavage (high dddP:dmdA gene ratios). Mean sea–air DMS fluxes (μmol m–2 d–1) increased from 0.3 in ice-covered waters to 10 in open waters (maximum of 26) owing to concurrent trends in near-surface DMS concentrations and physical drivers of gas exchange. Using remotely sensed sea-ice coverage and a compilation of sea–air DMS flux data, we estimated that the pan-Arctic DMS emission from the MIZ (EDMS, MIZ) was 5–13 Gg S yr–1. North of 80°N, EDMS, MIZ might have increased by around 10 ± 4% yr–1 between 2003 and 2014, likely exceeding open-water emissions in June and July. We conclude that EDMS, MIZ must be taken into account to evaluate plankton-climate feedbacks in the Arctic
Arctic · Arctic ice pack · Atmospheric sciences · Bay · Biogeochemical cycle · Bloom · Climate change · Dimethylsulfoniopropionate · Nutrient · Phytoplankton · Radiative forcing · Sea ice · Arctic and Antarctic ice dynamics · Atmospheric chemistry and aerosols · Chemistry · Environmental Science · Marine and coastal ecosystems · Environmental Chemistry · Geology · Oceanography
Polar oceans and sea ice in a changing climate
Thin and transient meltwater layers and false bottoms in the Arctic sea ice pack—Recent insights on these historically overlooked features
The biogenic sulfur cycle in the coupled ocean–sea ice–atmosphere system
Simulated increases of future Arctic dimethylsulfide ocean concentrations, emissions and high-flux events
Processes and impacts of Arctic amplification
Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling
The evolution of light and vertical mixing across a phytoplankton ice-edge bloom
Environmental drivers of under-ice phytoplankton bloom dynamics in the Arctic Ocean
Temporal evolution of IP25 and other highly branched isoprenoid lipids in sea ice and the underlying water column during an Arctic melting season
Dimethyl sulfide control of the clean summertime Arctic aerosol and cloud
Late spring bloom development of pelagic diatoms in Baffin Bay
| Unique citing works | 4 |
|---|---|
| Citations per year | 1.33 |
| Citation span | 2023 - 2026 (4) |
| Citation velocity | current |
| Highly cited | No |
| Citation types | Neutral: 4 |