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News Release 15-144
Low-oxygen 'dead zones' in North Pacific linked to past ocean warming
Large-scale warming events 10,000-plus years ago triggered loss of oxygen
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![Scientist lowering an instrument in water](/news/mmg/media/images/Water_Sampling_Disenchantment_Bay_2004_August_f.jpg)
Scientists obtain ocean salinity and temperature readings near Hubbard Glacier, Alaska.
Credit: SE Alaska Scientific Party
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![Hubbard Glacier during a calving event.](/news/mmg/media/images/Hubbard_Glacier_Alaska_Calving_2004_August_f.jpg)
Alaskan glaciers on-the-move: here, Hubbard Glacier during a calving event.
Credit: SE Alaska Scientific Party
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![Chief scientist Alan Mix aboard the research vessel Maurice Ewing off coastal Alaska.](/news/mmg/media/images/Chief_Scientist_Alan Mix_2004_August_f.jpg)
Chief scientist Alan Mix aboard the research vessel Maurice Ewing off coastal Alaska.
Credit: SE Alaska Scientific Party
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![Split sediment cores from offshore Alaska, showing green laminated diatom-rich layers.](/news/mmg/media/images/Core_Description_Alaska_2004_August_f.jpg)
Split sediment cores from offshore Alaska showing green-laminated, diatom-rich layers.
Credit: SE Alaska Scientific Party
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![Microscope image of sediment laden with diatoms](/news/mmg/media/images/diatoms_f_5cb54132-4994-4d2b-b019-eb8825a2214b.jpg)
Microscope image of sediment laden with diatoms, indicating an environment conducive to dead zones.
Credit: Cristina Lopes
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![Researcher Summer Praetorius with a microscope in a lab](/news/mmg/media/images/Lead_Author_Summer_Praetorius_2014_July_f.jpg)
Researcher Summer Praetorius peers into records of past ocean dead zones for a look at the future.
Credit: Alan Mix
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