Surface and underwater irradiance timeseries from the Stefansson Sound, Beaufort Sea, Alaska, 1984-2018.

• Main Authors: Dunton, Kenneth, Bonsell, Christina, Schonberg, Susan
• Format: Dataset
• Language: English
• Published: NSF Arctic Data Center 2020
• Subjects: Stefansson Sound; oceanography; Arctic; light; light attenuation; PAR; Stefansson; Beaufort Sea; Alaska
• Online Access: https://dx.doi.org/10.18739/a2sq8qj5v; https://arcticdata.io/catalog/view/doi:10.18739/A2SQ8QJ5V

In the nearshore Alaskan Beaufort Sea, discrete, isolated rocky habitats harbor biological communities that are unusually diverse for the region, with markedly different fauna and flora than found in the surrounding soft sediment areas. The boulder fields also support tightly linked food webs, with connections to higher trophic levels such as fishes and seals. These systems are highly vulnerable to disturbances, including sedimentation from human activities and coastal erosion, fluctuations in salinity from seasonal river discharge, and temperature increases from heat influx originating at lower latitudes and from atmospheric warming. Spatial isolation of these boulder fields and the slow development of benthic communities limit ecosystem recovery from disturbance. To assess the possible ecological effects of such environmental disturbances, this field program undertook an investigation of the biological communities and environmental conditions across the Stefansson Sound Boulder Patch, the largest of the Beaufort Sea nearshore boulder fields. The overlying objectives of this program were to: 1) monitor incident and in situ photosynthetically active radiation (PAR), salinity, temperature, currents, and pH to define the spatial variability in annual kelp productivity and biomass; 2) characterize benthic community structure changes across environmental gradients in the Boulder Patch and 3) collect annual measurements of kelp growth in the Boulder Patch to provide a nearly continuous record of kelp growth since 1976. Within and in addition to these objectives, individual research projects were completed, using experimental approaches, timeseries analysis and historical data to gain an in depth understanding of mechanisms (past and present) that resulted in the Boulder Patch community we see today and how this community may vary in future conditions. These datasets here result from ecosystem studies and monitoring that took place from 1976 to 2018 at multiple site in Stefansson Sound, Alaska. To understand spatiotemporal variability in underwater light environment, photosyntheically active radiation (PAR, 400-700 nanometers) was measured from moorings on the benthos at multiple locations in Stefansson Sound, Alaska using LICOR spherical quantum sensors, and at an adjacent site on land for incident PAR using LICOR cosine sensors. The overall dataset spans from 1984 to 2018, though there are gaps that vary from days to multiple years, depending on the location.