Biogeochemical Dynamics of a Glaciated High‐Latitude Wetland

Buser-Young, Jessica Z.; Peck, Erin K.; Chace, Peter J.; Lapham, L.; Vizza, Carmella; Colwell, Frederick S.

doi:10.1029/2021jg006584

Cited by 3 publications

(1 citation statement)

References 146 publications

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“…in determining biogeochemical transformations. Future studies should consider anthropogenic climatic impacts on transport and processing of DOM in light of major hydrologic events (Lu and Liu, 2019), peak glacial melt (Buser-Young et al, 2022), and other extreme weather events (Zhang et al, 2016;Olmedo et al, 2022).…”

Section: Sediment Biogeochemistrymentioning

confidence: 99%

Determining the biogeochemical transformations of organic matter composition in rivers using molecular signatures

et al. 2023

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Inland waters are hotspots for biogeochemical activity, but the environmental and biological factors that govern the transformation of organic matter (OM) flowing through them are still poorly constrained. Here we evaluate data from a crowdsourced sampling campaign led by the Worldwide Hydrobiogeochemistry Observation Network for Dynamic River Systems (WHONDRS) consortium to investigate broad continental-scale trends in OM composition compared to localized events that influence biogeochemical transformations. Samples from two different OM compartments, sediments and surface water, were collected from 97 streams throughout the Northern Hemisphere and analyzed to identify differences in biogeochemical processes involved in OM transformations. By using dimensional reduction techniques, we identified that putative biogeochemical transformations and microbial respiration rates vary across sediment and surface water along river continua independent of latitude (18°N−68°N). In contrast, we reveal small- and large-scale patterns in OM composition related to local (sediment vs. water column) and reach (stream order, latitude) characteristics. These patterns lay the foundation to modeling the linkage between ecological processes and biogeochemical signals. We further showed how spatial, physical, and biogeochemical factors influence the reactivity of the two OM pools in local reaches yet find emergent broad-scale patterns between OM concentrations and stream order. OM processing will likely change as hydrologic flow regimes shift and vertical mixing occurs on different spatial and temporal scales. As our planet continues to warm and the timing and magnitude of surface and subsurface flows shift, understanding changes in OM cycling across hydrologic systems is critical, given the unknown broad-scale responses and consequences for riverine OM.

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Section: Sediment Biogeochemistrymentioning

confidence: 99%

Determining the biogeochemical transformations of organic matter composition in rivers using molecular signatures

et al. 2023

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Distributionally-Robust Optimization for Sustainable Exploitation of the Infinite-Dimensional Superposition of Affine Processes with an Application to Fish Migration

Yoshioka

Tsujimura

Yoshioka

2023

Computational Science – ICCS 2023

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The Effects of Engineered Aeration on Atmospheric Methane Flux From a Chesapeake Bay Tidal Tributary

Lapham

Hobbs

Testa

et al. 2022

Front. Environ. Sci.

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Engineered aeration is one solution for increasing oxygen concentrations in highly eutrophic estuaries that undergo seasonal hypoxia. Although there are various designs for engineered aeration, all approaches involve either destratification of the water column or direct injection of oxygen or air through fine bubble diffusion. To date, the effect of either approach on estuarine methane dynamics remains unknown. Here we tested the hypotheses that 1) bubble aeration will strip the water of methane and enhance the air-water methane flux to the atmosphere and 2) the addition of oxygen to the water column will enhance aerobic methane oxidation in the water column and potentially offset the air-water methane flux. These hypotheses were tested in Rock Creek, Maryland, a shallow-water sub-estuary to the Chesapeake Bay, using controlled, ecosystem-scale deoxygenation experiments where the water column and sediments were sampled in mid-summer, when aerators were ON, and then 1, 3, 7, and 13 days after the aerators were turned OFF. Experiments were performed under two system designs, large bubble and fine bubble approaches, using the same observational approach that combined discrete water sampling, long term water samplers (OsmoSamplers) and sediment porewater profiles. Regardless of aeration status, methane concentrations reached as high as 1,500 nmol L−1 in the water column during the experiments and remained near 1,000 nmol L−1 through the summer and into the fall. Since these concentrations are above atmospheric equilibrium of 3 nmol L−1, these data establish the sub-estuary as a source of methane to the atmosphere, with a maximum atmospheric flux as high as 1,500 µmol m−2 d−1, which is comparable to fluxes estimated for other estuaries. Air-water methane fluxes were higher when the aerators were ON, over short time frames, supporting the hypothesis that aeration enhanced the atmospheric methane flux. The fine-bubble approach showed lower air-water methane fluxes compared to the larger bubble, destratification system. We found that the primary source of the methane was the sediments, however, in situ methane production or an upstream methane source could not be ruled out. Overall, our measurements of methane concentrations were consistently high in all times and locations, supporting consistent methane flux to the atmosphere.

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Biogeochemical Dynamics of a Glaciated High‐Latitude Wetland

Cited by 3 publications

References 146 publications

Determining the biogeochemical transformations of organic matter composition in rivers using molecular signatures

Determining the biogeochemical transformations of organic matter composition in rivers using molecular signatures

Distributionally-Robust Optimization for Sustainable Exploitation of the Infinite-Dimensional Superposition of Affine Processes with an Application to Fish Migration

The Effects of Engineered Aeration on Atmospheric Methane Flux From a Chesapeake Bay Tidal Tributary

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