Emergence of Anoxia in the California Current Large Marine Ecosystem

  title={Emergence of Anoxia in the California Current Large Marine Ecosystem},
  author={F. Chan and J. Barth and J. Lubchenco and A. Kirincich and H. Weeks and W. Peterson and B. Menge},
  pages={920 - 920}
Eastern boundary current systems are among the world's most productive large marine ecosystems. Because upwelling currents transport nutrient-rich but oxygen-depleted water onto shallow seas, large expanses of productive continental shelves can be vulnerable to the risk of extreme low-oxygen events. Here, we report the novel rise of water-column shelf anoxia in the northern California Current system, a large marine ecosystem with no previous record of such extreme oxygen deficits. The expansion… Expand

Topics from this paper

Microbial biogeochemistry of coastal upwelling regimes in a changing ocean
The coastal upwelling regimes located along the eastern boundaries of the Pacific and Atlantic Ocean basins are small in size, but make a disproportionate contribution to the productivity andExpand
First Evidence of Anoxia and Nitrogen Loss in the Southern Canary Upwelling System
The northeastern Atlantic hosts the most ventilated subsurface waters of any eastern boundary upwelling system, while coastal upwelling source waters are slightly above hypoxic levels. AnoxicExpand
Occurrence of demersal fishes in relation to near‐bottom oxygen levels within the California Current large marine ecosystem
Groundfish surveys across a range of conditions from the upper to the lower limit of the oxygen minimum zone and shoreward across the continental shelf of the US west coast found spotted ratfish and petrale sole were sensitive to changes in near-bottom oxygen, while greenstriped rockfish and Dover sole show no changes in probability of occurrence. Expand
Oxygen declines and the shoaling of the hypoxic boundary in the California Current
[1] We use hydrographic data from the California Cooperative Oceanic Fisheries Investigations program to explore the spatial and temporal variability of dissolved oxygen (DO) in the southernExpand
Future changes in coastal upwelling ecosystems with global warming: The case of the California Current System
A high-resolution model is used to examine the response of nutrients and plankton dynamics to future climate change in the California Current System (CCS), showing increased upwelling intensity associated with stronger alongshore winds in the coastal region, and enhanced upper-ocean stratification in both the CCS and open ocean. Expand
Dynamics of oxygen depletion in the nearshore of a coastal embayment of the southern Benguela upwelling system
Acquisition of high resolution time series of water column and bottom dissolved oxygen (DO) concentrations inform the dynamics of oxygen depletion in St Helena Bay in the southern Benguela upwellingExpand
Biogeochemical drivers of changing hypoxia in the California Current Ecosystem
Abstract Recent observations have revealed significant fluctuations in near-shore hypoxia in the California Current Ecosystem (CCE). These fluctuations have been linked to changes in theExpand
A water mass history of the Southern California current system
The California Current System represents a confluence of different water masses originating in the subarctic, subtropical, and tropical eastern Pacific. Variations in their relative influence canExpand
Hydrographic and dissolved oxygen variability in a seasonal Pacific Northwest estuary
Abstract Hypoxia is an issue of growing concern for coastal communities. In the California Current System, a prototypical eastern boundary current, attention has been focused on explaining the trendExpand
Processes influencing seasonal hypoxia in the northern California Current System.
In the four years studied, upwelling of low DO water and changes in source water contribute to interannual variability, but cannot account for seasonal decreases below hypoxic concentrations. Expand


Upwelling-driven nearshore hypoxia signals ecosystem and oceanographic changes in the northeast Pacific
The unprecedented development of severe inner-shelf (<70 m) hypoxia and resultant mass die-offs of fish and invertebrates within the California Current System is reported, highlighting the sensitivity of inner- shelf ecosystems to variation in ocean conditions, and the potential impacts of climate change on marine communities. Expand
Delayed upwelling alters nearshore coastal ocean ecosystems in the northern California current
It is shown how a 1-month delay in the 2005 spring transition to upwelling-favorable wind stress in the northern California Current Large Marine Ecosystem resulted in numerous anomalies: warm water, low nutrient levels, low primary productivity, and an unprecedented low recruitment of rocky intertidal organisms. Expand
Global distribution of naturally occurring marine hypoxia on continental margins
Hypoxia in the ocean influences biogeochemical cycling of elements, the distribution of marine species and the economic well being of many coastal countries. Previous delineations of hypoxicExpand
Rapid 20th-Century Increase in Coastal Upwelling off Northwest Africa
It is suggested that coastal upwelling varies with NHTAs and that up welling off northwest Africa may continue to intensify as global warming and atmospheric CO2 levels increase. Expand
Greenhouse gas buildup, sardines, submarine eruptions and the possibility of abrupt degradation of intense marine upwelling ecosystems
Widespread hypoxia and massive eruptions of noxious, radiatively active gases currently characterize the world's strongest eastern ocean upwelling zone. Theory, modelling results and observationsExpand
Life at stable low oxygen levels: adaptations of animals to oceanic oxygen minimum layers.
Given the stable presence of very low O2 levels in the minima, the primary adaptations of animals living within them are those that support aerobic metabolism by giving the animals remarkable abilities to extract O2 from water. Expand
Primary production required to sustain global fisheries
THE mean of reported annual world fisheries catches for 1988-1991 (94.3 million t) was split into 39 species groups, to which fractional trophic levels, ranging from 1.0 (edible algae) to 4.2Expand
  • R. Rosenfeld
  • Medicine
  • Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery
  • 2009
I am writing with a simple plea to balance the voluminous articles about treatment in your journal with a modicum of information about nature and caring effects to rekindle the perception of physicians as healers, not only treaters, who relish the gifts of nature, and foster the humanistic aspect of medicine that has thrived for millennia. Expand
疟原虫var基因转换速率变化导致抗原变异[英]/Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
Deep Sea Res
  • Deep Sea Res
  • 2004