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Temperature, discharge and light data for Ivishak Hot Spring, Alaska



The productivity of a perennial, Arctic spring-stream was investigated. Ivishak Spring has the stable discharge (~131 L/s) and temperature (~4-8 deg C) typical for springs. It is unusual, however, in having an annual cycle of daylight from 24 hrs/d (summer) to 0 hrs/d (winter). It was tested from the hypothesis that stored detritus would buffer carbon limitation during winter when gross primary production (GPP) is minimized, resulting in constant rates of community respiration (CR) year-round due to constant temperatures. Open-channel methods were used to measure GPP and CR monthly from March 2007 to August 2009. Mean annual GPP was 458 gC/m2. Such a level is typical for temperate desert streams but was surprising for an Arctic stream. Annual CR (887 gC/m2) was also remarkable. The high metabolism of this stream is explained by an open canopy, moderate year-round temperatures, stable bed, and high bryophyte biomass (48 gAFDM/m2). Strong seasonal cycles of GPP were mirrored by CR (r=0.65) indicating the possibility of carbon limitation during winter. This result falsified the hypothesis that CR would be relatively stable year-round due to a detritus buffer and constant temperature.

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Additional information

  • 1.0 (2011-12-07)
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Related projects
Spatial Type point
Frequency 5 minute
Language English
Grant Code 0611995
ISO Topic Categories
  • inlandWaters
GCMD Science Keywords Expand keywords
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Temporal coverage

Begin datetime 2006-08-08 00:00:00
End datetime 2009-08-05 23:59:59

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 69.025, Minimum (South) Latitude: 69.024
Minimum (West) Longitude: -147.721, Maximum (East) Longitude: -147.719

Primary point of contact information

Alexander D. Huryn <>

Additional contact information


Huryn, A., Benstead, J. 2011. Temperature, discharge and light data for Ivishak Hot Spring, Alaska. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 14 Jun 2024.

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