Introduction to CCE-LTER: Responses of the California Current Ecosystem to climate forcing

Goericke, Ralf; Ohman, Mark D.

doi:10.1016/j.dsr2.2014.12.001

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…As is typical for CCE process cruises, each Cycle of the P1408 and P1604 cruises followed particular water masses as determined by surface salinity, temperature, and Chl a (e.g., Landry et al ; Goericke and Ohman ). Surface water (10–50 m) was anomalously warm by 0.8–1.5°C for all cycles during these two cruises (Zaba and Rudnick ).…”

Section: Resultsmentioning

confidence: 99%

Euphotic zone nitrification in the California Current Ecosystem

Stephens

Wankel

Beman

et al. 2019

Limnology & Oceanography

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Nitrification, the microbial conversion of ammonium to nitrite then to nitrate, occurs throughout the oceanic water column, yet the environmental factors influencing the production of nitrate in the euphotic zone (EZ) remain unclear. In this study, the natural abundances of N and O isotopes (δ 15 N and δ 18 O, respectively) in nitrate were used in an existing model framework to quantify nitrate contributed by EZ nitrification in the California Current Ecosystem (CCE) during two anomalously warm years. Model data estimated that between 6% and 36% of the EZ nitrate reservoirs were derived from the combined steps of nitrification within the EZ. The CCE data set found nitrification contributions to EZ nitrate to be positively correlated with nitrite concentrations ( NO − 2

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Section: Resultsmentioning

confidence: 99%

Euphotic zone nitrification in the California Current Ecosystem

Stephens

Wankel

Beman

et al. 2019

Limnology & Oceanography

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“…The North Pacific EBUS along the northwest American coast is known as the California current system (CCS). Many research efforts have been carried out to better understand CCS circulation and California current ecosystem (CCE) dynamics and responses to climate forcing (Goericke & Ohman, 2015). In the CCS, for much of the year—but primarily in spring and summer (Di Lorenzo, 2003)—winds blow equatorward along the California coast.…”

Section: Introductionmentioning

confidence: 99%

Cross‐Shore Flow and Implications for Carbon Export in the California Current Ecosystem: A Lagrangian Analysis

et al. 2021

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In Eastern boundary upwelling systems (EBUS), winds blow alongshore during the upwelling season, causing nutrient-replete deep waters to come to the euphotic zone through divergence of Ekman transport at the coast, stimulating elevated net primary production (NPP) and inorganic carbon uptake. This primary production induces secondary production, the recycling of nutrients, and export of organic carbon into the aphotic zone. EBUSs are strongly advective systems: Ekman currents, as well as intense geostrophic mesoscale eddies and filaments, transport nearshore surface water offshore. The transport of organic matter (OM) from formation sites to export sites, occurs in three-dimensional space: the location of carbon export may be offset spatially from the region of elevated PP (

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“…Quantifying the relationship between environmental drivers and krill distribution patterns can elucidate krill spatiotemporal variability, species interactions and improve prediction of ecosystem condition (Cury et al ). Long‐term monitoring of krill is a critical component of many ecosystem assessments globally (Smith et al , Sydeman et al , Goericke and Ohman , Ralston et al , Atkinson et al ), and the development of predictive models (i.e. species distribution models) from these datasets can map variability in krill habitat and inform spatial management of krill predators to achieve ecosystem‐based management objectives (Hazen et al ).…”

Section: Introductionmentioning

confidence: 99%

Essential krill species habitat resolved by seasonal upwelling and ocean circulation models within the large marine ecosystem of the California Current System

et al. 2020

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Due to their global distribution, high biomass and energy content, euphausiids (krill) are important prey for many mid and upper trophic level marine organisms. Understanding drivers of krill habitat is essential for forecasting range shifts, and to better understand the response of krill predators to climate change. We hypothesized that the distribution and abundance of krill species derived from ecosystem surveys in spring/summer relates to geomorphic features, coastal upwelling during the preceding winter, and spring mesoscale oceanographic conditions. To test this hypothesis, we used boosted regression trees with environmental data and ocean model output to quantify the habitat associations of two primary krill species (Euphausia pacifica and Thysanoessa spinifera) in the central California Current Ecosystem from 2002 to 2018. Models confirmed the neritic distribution of T. spinifera and pelagic, outer slope association of E. pacifica (deviance explained ~35%). Distribution of these species were influenced by depth and bottom rugosity; chlorophyll-a concentrations and increased winter upwelling conditions; and spring surface currents and wind stress. Thysanoessa spinifera and E. pacifica abundance responded negatively (positively) to warm (cold) climate events, confirming known relationships. As an independent evaluation of krill models, observations of krill predator (seabirds, marine mammals) distribution indicated they were present within habitats of predicted high krill species abundance. Our framework indicates species-specific habitat relationships for these foundational forage species and their negative response to large-scale climate variations, such as El Niño and marine heatwave conditions. The approach can be easily transferred to other ecosystems or krill species that respond to similar ocean and climate forcing.

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Introduction to CCE-LTER: Responses of the California Current Ecosystem to climate forcing

Cited by 14 publications

References 27 publications

Euphotic zone nitrification in the California Current Ecosystem

Euphotic zone nitrification in the California Current Ecosystem

Cross‐Shore Flow and Implications for Carbon Export in the California Current Ecosystem: A Lagrangian Analysis

Essential krill species habitat resolved by seasonal upwelling and ocean circulation models within the large marine ecosystem of the California Current System

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