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Montana Creek Alaska hydrology and biogeochemistry

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Created:	Jun 23, 2025 at 3:57 p.m. (UTC)
Last updated:	Jun 23, 2025 at 5:58 p.m. (UTC)
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Abstract

High northern latitudes are experiencing dramatic changes in precipitation and air temperatures. These changes can impact river discharge and concentrations of bioreactive elements like carbon and nitrogen, but the pathways linking soil source pools to streams remain poorly constrained. Here we use high frequency water isotope and biogeochemical concentrations from a temperate forested watershed in Southeast Alaska to better understand how rainfall can influence water flow pathways, stream discharge, and concentrations of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN). We found that shallow groundwater traveling through organic matter rich surface horizons dominates contributions to stream water discharge during both wet and dry periods. Additionally, DOC yields generally increase with heightened shallow groundwater contributions and greater discharge, while TDN is more disconnected from these hydrologic processes. However, increased future groundwater contributions from shallow flowpaths to streams, particularly during repeated storm events, in a warmer and wetter region could lead to temporary periods of DOC source limitations, but will have little impact on TDN. Further, our findings suggest that concentration-discharge relationships for TDN appear to be controlled primarily by reach-scale factors, which could also shift in the future due to changes like warming stream temperatures due to shrinking snow and glacial meltwater inputs to surface water. These stream DOC/TDN dynamics could also impact nutrient availability in coastal regions that have limited mixing with the open ocean.

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Coverage

Spatial

Coordinate System/Geographic Projection:

WGS 84 EPSG:4326

Coordinate Units:

Decimal degrees

North Latitude

58.4916°

East Longitude

-134.4273°

South Latitude

58.3362°

West Longitude

-134.6869°

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Credits

Funding Agencies

This resource was created using funding from the following sources:

Agency Name	Award Title	Award Number
National Science Foundation	Alaska EPSCoR	OIA-1757348; ORE-CZ (EAR-2227821)

How to Cite

Klein, E., J. Fellman, E. Hood (2025). Montana Creek Alaska hydrology and biogeochemistry, HydroShare, http://www.hydroshare.org/resource/6295780bfa9a46cbb5cdfdbd0ce0adc7

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

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