Area of research
Oceanography · Atmospheric Science
Research interest
Research topics from publications: Unifying Concepts Linking Dissolved Organic Matter Composition to Persistence in Aquatic Ecosystems; Pan-Arctic Trends in Terrestrial Dissolved Organic Matter from Optical Measurements; DOM composition and transformation in boreal forest soils: The effects of temperature and organic‐horizon decomposition state; Novel insights from NMR spectroscopy into seasonal changes in the composition of dissolved organic matter exported to the Bering Sea by the Yukon River. Representative work: The link between composition and reactivity of dissolved organic matter (DOM) is central to understanding the role aquatic systems play in the global carbon cycle; yet, unifying concepts driving molecular composition have yet to be established. We characterized 37 DOM isolates from diverse aquatic ecosystems, including their stable and radiocarbon isotopes (δ13C-dissolved organic carbon (DOC) and Δ14C-DOC), optical properties (absorbance and fluorescence), and molecular composition (ultrahigh resolution mass spectrometry). Isolates encompassed end-members of allochthonous and autochthonous DOM from sites across the United States, the Pacific Ocean, and Antarctic lakes. Modern Δ14C-DOC and op Climate change is causing extensive warming across arctic regions resulting in permafrost degradation, alterations to regional hydrology, and shifting amounts and composition of dissolved organic matter (DOM) transported by streams and rivers. Here, we characterize the DOM composition and optical properties of the six largest arctic rivers draining into the Arctic Ocean to examine the ability of optical measurements to provide meaningful insights into terrigenous carbon export patterns and biogeochemical cycling. The chemical composition of aquatic DOM varied with season, spring months were typified by highest lignin phenol and dissolved organic carbon (DOC) concentrations with greater hydro
Unifying Concepts Linking Dissolved Organic Matter Composition to Persistence in Aquatic Ecosystems
Pan-Arctic Trends in Terrestrial Dissolved Organic Matter from Optical Measurements
DOM composition and transformation in boreal forest soils: The effects of temperature and organic‐horizon decomposition state
Novel insights from NMR spectroscopy into seasonal changes in the composition of dissolved organic matter exported to the Bering Sea by the Yukon River