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Poised at the interface of rivers, ocean, atmosphere and dense human settlement, estuaries are driven by a large array of natural and anthropogenic forces. Long-term study of San Francisco Bay illustrates responses to five common agents of change where land and sea meet: water consumption and diversion, human modification of...

In the McMurdo Dry Valleys of Antarctica (MDV), streams are an important source of water and hydrologic connectivity between glaciers and lakes across the valleys, however, these streams only run for a few weeks to a few months out of the year. Unlike the streams that are only active in...

Groundwater supports streamflow and ecosystems in semi-arid, montane catchments, which are environments considered particularly sensitive to climate change. Despite its importance, the relationship between groundwater and streamflow is not well understood. To remedy this, we seek to model groundwater-surface water interactions to assess how groundwater discharge to surface water varies...

Reservoirs are typically considered too young and dynamic to validate paleolimnological analysis (Filstrup et al. 2010). Using biological and mineralogical proxies, three shifts were identified in the history of Possum Kingdom Lake, successfully demonstrating the application of paleolimnology in reservoirs. The trends documented may provide insight into the factors driving...

In the McMurdo Dry Valleys [MDV], Antarctica, little is known about concentration-discharge ( C-q ) relationships for biological solutes such as DOC. Because MDV streams are low in organic carbon and experience large diel fluctuations in discharge ( q ), we expected that the MDV DOC- q relationship would be...

The Greenland Ice Sheet (GrIS) rapid mass loss is primarily driven by an increase in meltwater runoff, which highlights the importance of understanding the formation, evolution and impact of meltwater features on the ice sheet. Buried lakes are meltwater features that contain liquid water and exist under layers of snow,...

Machine learning algorithms are gaining popularity in the hydrologic sciences. These algorithms often require tuning hyperparameters to tailor their performance to a specific purpose. Often these hyperparameters are selected based on prior assumptions or a single-objective optimization. However, these techniques fail to capture tradeoffs between type I (i.e., false positive)...

Much is still unknown about the current permafrost and hydrological conditions of the Gates of the Arctic National Park and Preserve. This study addresses the question of how thermal and hydrogeologic properties of the subsurface may affect active layer dynamics and groundwater flow in the Nutuvukti Lake watershed. Results from...

Zinc concentrations before and after the implementation of remediation strategies were examined in three sub-watersheds in southwestern Colorado. Three tributaries to the Animas River (Cement Creek, Mineral Creek, and the Upper Animas River) were analyzed for pre- and post- remediation changes in zinc loading. A fourth site below all tributaries...

Reduced human activity associated with lockdown protocols due to the Covid-19 pandemic have temporarily changed carbon emission patterns of urban ecosystems globally. Understanding how these changes anthropogenic activities contribute to the urban emissions offer the opportunity to better understand the carbon dynamics outside pandemic conditions. Here we explore how the...