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North Pacific deglacial hypoxic events linked to abrupt ocean warming

Overview of attention for article published in Nature, November 2015
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (96th percentile)
  • Average Attention Score compared to outputs of the same age and source

Mentioned by

4 news outlets
1 blog
28 tweeters
1 Google+ user

Readers on

168 Mendeley
2 CiteULike
North Pacific deglacial hypoxic events linked to abrupt ocean warming
Published in
Nature, November 2015
DOI 10.1038/nature15753
Pubmed ID

S. K. Praetorius, A. C. Mix, M. H. Walczak, M. D. Wolhowe, J. A. Addison, F. G. Prahl


Marine sediments from the North Pacific document two episodes of expansion and strengthening of the subsurface oxygen minimum zone (OMZ) accompanied by seafloor hypoxia during the last deglacial transition. The mechanisms driving this hypoxia remain under debate. We present a new high-resolution alkenone palaeotemperature reconstruction from the Gulf of Alaska that reveals two abrupt warming events of 4-5 degrees Celsius at the onset of the Bølling and Holocene intervals that coincide with sudden shifts to hypoxia at intermediate depths. The presence of diatomaceous laminations and hypoxia-tolerant benthic foraminiferal species, peaks in redox-sensitive trace metals, and enhanced (15)N/(14)N ratio of organic matter, collectively suggest association with high export production. A decrease in (18)O/(16)O values of benthic foraminifera accompanying the most severe deoxygenation event indicates subsurface warming of up to about 2 degrees Celsius. We infer that abrupt warming triggered expansion of the North Pacific OMZ through reduced oxygen solubility and increased marine productivity via physiological effects; following initiation of hypoxia, remobilization of iron from hypoxic sediments could have provided a positive feedback on ocean deoxygenation through increased nutrient utilization and carbon export. Such a biogeochemical amplification process implies high sensitivity of OMZ expansion to warming.

Twitter Demographics

The data shown below were collected from the profiles of 28 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 168 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United States 3 2%
Mexico 2 1%
Ireland 1 <1%
Canada 1 <1%
Unknown 161 96%

Demographic breakdown

Readers by professional status Count As %
Researcher 35 21%
Student > Ph. D. Student 34 20%
Student > Master 22 13%
Professor 14 8%
Student > Bachelor 11 7%
Other 26 15%
Unknown 26 15%
Readers by discipline Count As %
Earth and Planetary Sciences 80 48%
Environmental Science 27 16%
Agricultural and Biological Sciences 9 5%
Social Sciences 3 2%
Engineering 3 2%
Other 14 8%
Unknown 32 19%

Attention Score in Context

This research output has an Altmetric Attention Score of 55. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 16 December 2015.
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Outputs of similar age from Nature
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Altmetric has tracked 15,355,549 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 97th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 74,450 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 83.6. This one has gotten more attention than average, scoring higher than 73% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 365,301 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 96% of its contemporaries.
We're also able to compare this research output to 940 others from the same source and published within six weeks on either side of this one. This one is in the 43rd percentile – i.e., 43% of its contemporaries scored the same or lower than it.