Publications by Amber Joy Ulseth

Regimes of primary production and their drivers in Alpine streams

Mélanie Clémençon, Tom Ian Battin, Amber Joy Ulseth, Marta Boix Canadell, Luis Gómez Gener

Primary production is a fundamental ecosystem process that influences nutrient and carbon cycling, and trophic structure in streams. The magnitude and timing of gross primary production (GPP) are typically controlled by hydrology, light, nutrient availa ...

2021

Travel Time and Source Variation Explain the Molecular Transformation of Dissolved Organic Matter in an Alpine Stream Network

Tom Ian Battin, Amber Joy Ulseth, Hannes Markus Peter

Streams and rivers are important components of the carbon cycle as they transport and transform dissolved organic matter (DOM). Using high resolution Fourier transform ion cyclotron resonance mass spectrometry, we studied the spatial distribution of DOM at ...

2020

Exploring the Sources of Unexpected High Methane Concentrations and Fluxes From Alpine Headwater Streams

Amber Joy Ulseth, Sabine Flury McGinnis

The dynamics of methane generation and evasion from well-oxygenated, oligotrophic streams have been traditionally neglected. We estimated evasion of methane and assessed its sources and production pathways using a stable isotope approach in 16 oxygen-rich ...

AMER GEOPHYSICAL UNION2019

High‐resolution spatial sampling identifies groundwater as driver of CO 2 dynamics in an Alpine stream network

Tom Ian Battin, Amber Joy Ulseth, Asa Lovisa Viktoria Horgby, Marta Boix Canadell

Inland waters are major sources of CO2 to the atmosphere. The origin of this CO2 is often elusive, especially in high‐altitude streams that remain poorly studied at present. Here we study the spatial and seasonal variations in streamwater CO2, its potentia ...

2019

Alpine Glacier Shrinkage Drives Shift in Dissolved Organic Carbon Export From Quasi‐Chemostasis to Transport Limitation

Tom Ian Battin, Amber Joy Ulseth, Nicolas Thomas Georges Escoffier, Marta Boix Canadell

The export of dissolved organic carbon (DOC) from catchments is considered as an important energy flux through streams and a major connection between terrestrial and aquatic systems. However, the impact that predicted hydrological changes due to glacier re ...

2019

Distinct air–water gas exchange regimes in low- and high-energy streams

Amin Niayifar, Tom Ian Battin, Amber Joy Ulseth, Marta Boix Canadell

2019

Unexpected large evasion fluxes of carbon dioxide from turbulent streams draining the world’s mountains

Enrico Bertuzzo, Tom Ian Battin, Amber Joy Ulseth, Pier Luigi Segatto, Asa Lovisa Viktoria Horgby

Inland waters, including streams and rivers, are active components of the global carbon cycle.Despite the large areal extent of the world’s mountains, the role of mountain streams forglobal carbonfluxes remains elusive. Using recent insights from gas excha ...

Nature Research2019

Climate-Induced Changes in Spring Snowmelt Impact Ecosystem Metabolism and Carbon Fluxes in an Alpine Stream Network

Enrico Bertuzzo, Tom Ian Battin, Amber Joy Ulseth

Although stream ecosystems are recognized as an important component of the global carbon cycle, the impacts of climate-induced hydrological extremes on carbon fluxes in stream networks remain unclear. Using continuous measurements of ecosystem metabolism, ...

Springer Verlag2018

High light intensity mediates a shift from allochthonous to autochthonous carbon use in phototrophic stream biofilms

Tom Ian Battin, Amber Joy Ulseth

Changes in the riparian vegetation along stream channels, diurnal light availability, and longitudinal fluctuations in the local light regime in streams influence primary production and carbon (C) cycling in benthic stream biofilms. To investigate the infl ...

Amer Geophysical Union2017

Ecosystem metabolism and carbon fluxes in a sub-alpine stream network

Amber Joy Ulseth

Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzlerland2017

Land use controls stream ecosystem metabolism by shifting dissolved organic matter and nutrient regimes

Amber Joy Ulseth

Stream ecosystem metabolism integrates production and respiration of organic matter and plays a fundamental role in the global carbon (C) cycle. Several studies have identified distal and proximal physical controls, for example, land use and transient s ...

Wiley-Blackwell2017

Ecosystem metabolism and carbon fluxes in a sub-alpine stream network

Amber Joy Ulseth

Stroud Water Research Center, Avondale, PA, USA2017

Dam tailwaters compound the effects of reservoirs on the longitudinal transport of organic carbon in an arid river

Amber Joy Ulseth

Reservoirs on rivers can disrupt organic carbon (OC) transport and transformation, but less is known how river reaches directly below dams contribute to OC processing. We compared how reservoirs and their associated tailwaters affected OC quantity and qual ...

European Geosciences Union2015