A5033283123- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Toxic Organic Pollutants Impact
- Mercury impact and mitigation studies
- Methane Hydrates and Related Phenomena
- Water Resources and Management
- Cryospheric studies and observations
- Geological Studies and Exploration
- Ecology and biodiversity studies
- Geology and Paleoclimatology Research
- Peatlands and Wetlands Ecology
- Fish Ecology and Management Studies
- Botany and Plant Ecology Studies
- Marine and coastal ecosystems
- Marine and environmental studies
- Transboundary Water Resource Management
- Isotope Analysis in Ecology
- Indigenous Studies and Ecology
- Atmospheric chemistry and aerosols
- Aquatic and Environmental Studies
- Heavy metals in environment
- Radioactive contamination and transfer
- Marine Ecology and Invasive Species
University of Alaska Southeast
2023
Roshydromet
1997
The export and Δ 14 C‐age of dissolved organic carbon (DOC) was determined for the Yenisey, Lena, Ob', Mackenzie, Yukon rivers 2004–2005. Concentrations DOC elevate significantly with increasing discharge in these rivers, causing approximately 60% annual to occur during a 2‐month period following spring ice breakup. We present total flux from five ∼16 teragrams (Tg), conservatively estimate that input Arctic Ocean is 25–36 Tg, which ∼5–20% greater than previous fluxes. These fluxes are also...
Abstract Northern rivers connect a land area of approximately 20.5 million km 2 to the Arctic Ocean and surrounding seas. These account for ~10% global river discharge transport massive quantities dissolved particulate materials that reflect watershed sources impact biogeochemical cycling in ocean. In this paper, multiyear data sets from coordinated sampling program are used characterize organic carbon (POC) nitrogen (PN) export six largest within pan‐Arctic (Yenisey, Lena, Ob', Mackenzie,...
Quantification of sediment fluxes from rivers is fundamental to understanding land‐ocean linkages in the Arctic. Numerous publications have focused on this subject over past century, yet assessments temporal trends are scarce and consensus contemporary lacking. Published estimates vary widely, but often provide little accessory information needed interpret differences. We present a pan‐arctic synthesis flux 19 arctic rivers, primarily focusing contributions eight largest ones. For synthesis,...
Riverine carbonate alkalinity (HCO3- and CO32-) sourced from chemical weathering represents a significant sink for atmospheric CO2. Alkalinity flux Arctic rivers is partly determined by precipitation, permafrost extent, groundwater flow paths, surface vegetation, all of which are changing under warming climate. Here we show that over the past three half decades, export Yenisei Ob' Rivers increased 225 to 642 Geq yr-1 (+185%) 201 470 (+134%); an average rate 11.90 7.28 yr-1, respectively....
Land–ocean linkages are strong across the circumpolar north, where Arctic Ocean accounts for 1% of global ocean volume and receives more than 10% river discharge. Yet estimates riverine mercury (Hg) export constrained from direct Hg measurements remain sparse. Here, we report results a coordinated, year-round sampling program that focused on six major rivers to establish contemporary (2012–2017) benchmark export. We determine exported an average 20 000 kg y–1 total (THg, all forms Hg)....
Abstract Climate change is dramatically altering Arctic ecosystems, leading to shifts in the sources, composition, and eventual fate of riverine dissolved organic matter (DOM) Ocean. Here we examine a 6‐year DOM compositional record from six major rivers using Fourier‐transform ion cyclotron resonance mass spectrometry paired with carbon isotope data (Δ 14 C, δ 13 C) investigate how seasonality permafrost influence DOM, export may warming. Across pan‐Arctic, molecular composition...
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SignificanceRussian rivers are the predominant source of riverine mercury to Arctic Ocean, where methylmercury biomagnifies high levels in food webs. Pollution controls thought have decreased late-20th-century loading watersheds, but there no published long-term observations on Russian rivers. Here, we present a unique hydrochemistry dataset determine trends river particulate concentrations and fluxes recent decades. Using hydrologic deposition modeling together with multivariate time series...
Arctic rivers provide an integrated signature of the changing landscape and transmit signals change to ocean. Here, we use a decade particulate organic matter (POM) compositional data deconvolute multiple allochthonous autochthonous pan-Arctic watershed-specific sources. Constraints from carbon-to-nitrogen ratios (C:N), δ13C, Δ14C signatures reveal large, hitherto overlooked contribution aquatic biomass. Separation in age is enhanced by splitting soil sources into shallow deep pools (mean ±...
In contrast to fairly good knowledge of dissolved carbon and major elements in great Arctic rivers, seasonally resolved concentrations many trace remain poorly characterized, hindering assessment the current status possible future changes hydrochemistry Eurasian Arctic. To fill this gap, here we present results for a broad suite largest rivers Russian (Ob, Yenisey, Lena, Kolyma). For context, also that are more routinely measured these rivers. Water samples study were collected during an...
Climate models predict significant warming in the Arctic 21st century, which will impact functioning of terrestrial and aquatic ecosystems as well alter land‐ocean interactions Arctic. Because river discharge nutrient flux integrate large‐scale processes, they should be sensitive indicators change, but detection future changes requires knowledge current conditions. Our objective this paper is to evaluate state affairs with respect estimating Ocean from Russian rivers. To end we provide...
More than 10% of all continental runoff flows into the Arctic Ocean. This is a dominant feature Ocean with respect to water column structure and circulation. Yet understanding chemical characteristics from pan‐Arctic watershed surprisingly limited. The Pan‐ River Transport Nutrients, Organic Matter, Suspended Sediments ( PARTNERS) project was initiated in 2002 help remedy this deficit, an extraordinary data set has emerged over past few years as result effort. publicly available through...
Abstract A survey was conducted in the lower Don River system Russia to confirm presence of Dreissena bugensis , and compare its distribution relative that polymorpha . In 1999 2001–2002, dreissenid mussels were collected at 15 sites main river, connecting reservoirs, a major tributary, Manych River. Collections made near stations where long‐term monitoring data on total mineral (sum principal ions) calcium content available. Both species found all sites, with D. comprising 4–75% dreissenids...
Water quality in Russia has both domestic and international consequences. Domestically, it allows for appropriate management of aquatic systems; internationally, surface flow from present Russian former Soviet Union territory into waters (e.g., Arctic Ocean Aral, Black, Caspian seas) important implications global contamination levels developing future plans. Although during the era water monitoring network was one most extensive world, numerous anomalies identified data by foreign scientists...