Oceanographic Conditions During the Gulf of Alaska 2019 and 2020 Expeditions

Pakhomov, Evgeny A.; Figurkin, Alexander; Hunt, Brian R.; Somov, Alexei; Mahara, Natalie

doi:10.23849/npafctr18/20.24.

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sampling operations at each station included oceanographic data collection alongside eDNA sampling followed by trawl sampling as previously described (Pakhomov et al, 2019, 2022; Pakhomov, Weitkamp, et al, 2022). Briefly, turbidity, salinity, fluorescence, and dissolved oxygen data were measured via CTDs, and water samples were collected via Niskin for eDNA, chlorophyll, and macronutrients.…”

Section: Methodsmentioning

confidence: 99%

“…Briefly, turbidity, salinity, fluorescence, and dissolved oxygen data were measured via CTDs, and water samples were collected via Niskin for eDNA, chlorophyll, and macronutrients. For analysis in this paper, oceanographic data from each station was integrated across the top 100 m of the water column, encompassing the majority of the upper mixing layer observed in both expeditions which includes the primary salmon habitat (Pakhomov et al, 2019, 2022; Pakhomov, Weitkamp, et al, 2022; Somov et al, 2020). Water mass and location of eddies were identified based on Pakhomov, Weitkamp, et al (2022).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Environmental DNA survey of the Winter Salmonosphere in the Gulf of Alaska

Deeg

Esenkulova³

et al. 2023

Environmental DNA

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Environmental DNA survey of the Winter Salmonosphere in the Gulf of Alaska

Deeg

Esenkulova³

et al. 2023

Environmental DNA

View full text Add to dashboard Cite

show abstract

“…Results also showed a marked difference in spring bloom timing between 2019 and 2020 (Figure 9). Winter oceanographic conditions in 2019 and 2020 differed in surface temperature (on average, the region during 2020 was cooler than in 2019), eddies formation, and circulation patterns (Pakhomov et al, 2022). To some extent, these interannual differences were captured by the identified bioregions (Figure 10).…”

Section: Variability In Spring Bloom Timingmentioning

confidence: 99%

Bioregionalization of the coastal and open oceans of British Columbia and Southeast Alaska based on Sentinel-3A satellite-derived phytoplankton seasonality

et al. 2022

View full text Add to dashboard Cite

Classifying the ocean into regions with distinct biogeochemical or physical properties may enhance our interpretation of ocean processes. High-resolution satellite-derived products provide valuable data to address this task. Notwithstanding, no regionalization at a regional scale has been attempted for the coastal and open oceans of British Columbia (BC) and Southeast Alaska (SEA), which host essential habitats for several ecologically, culturally, and commercially important species. Across this heterogeneous marine domain, phytoplankton are subject to dynamic ocean circulation patterns and atmosphere-ocean-land interactions, and their variability, in turn, influences marine food web structure and function. Regionalization based on phytoplankton biomass patterns along BC and SEA’s coastal and open oceans can be valuable in identifying pelagic habitats and representing a baseline for assessing future changes. We developed a two-step classification procedure, i.e., a Self-Organizing Maps (SOM) analysis followed by the affinity propagation clustering method, to define ten bioregions based on the seasonal climatology of high-resolution (300 m) Sentinel-3 surface chlorophyll-a data (a proxy for phytoplankton biomass), for the period 2016-2020. The classification procedure allowed high precision delineation of the ten bioregions, revealing separation between off-shelf bioregions and those in neritic waters. Consistent with the high-nutrient, low-chlorophyll regime, relatively low values of phytoplankton biomass (< 1 mg/m3) distinguished off-shelf bioregions, which also displayed, on average, more prominent autumn biomass peaks. In sharp contrast, neritic bioregions were highly productive (>> 1 mg/m3) and characterized by different phytoplankton dynamics. The spring phytoplankton bloom onset varied spatially and inter-annually, with substantial differences among bioregions. The proposed high-spatial-resolution regionalization constitutes a reference point for practical and more extensive implementation in understanding the spatial dynamics of the regional ecology, data-driven ocean observing systems, and objective regional management.

show abstract

Oceanographic Conditions During the Gulf of Alaska 2019 and 2020 Expeditions

Cited by 2 publications

References 0 publications

Environmental DNA survey of the Winter Salmonosphere in the Gulf of Alaska

Environmental DNA survey of the Winter Salmonosphere in the Gulf of Alaska

Bioregionalization of the coastal and open oceans of British Columbia and Southeast Alaska based on Sentinel-3A satellite-derived phytoplankton seasonality

Contact Info

Product

Resources

About