A Sixteen-year Decline in Dissolved Oxygen in the Central California Current

Abstract A potential consequence of climate change is global decrease in dissolved oxygen at depth in the oceans due to changes in the balance of ventilation, mixing, respiration, and photosynthesis. We present hydrographic cruise observations of declining dissolved oxygen collected along CalCOFI Li...

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Autores principales:	Alice S. Ren, Fei Chai, Huijie Xue, David M. Anderson, Francisco P. Chavez
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6c12fdf7452d4d0780bffc2f2bb7c5e1
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spelling	oai:doaj.org-article:6c12fdf7452d4d0780bffc2f2bb7c5e12021-12-02T11:40:24ZA Sixteen-year Decline in Dissolved Oxygen in the Central California Current10.1038/s41598-018-25341-82045-2322https://doaj.org/article/6c12fdf7452d4d0780bffc2f2bb7c5e12018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25341-8https://doaj.org/toc/2045-2322Abstract A potential consequence of climate change is global decrease in dissolved oxygen at depth in the oceans due to changes in the balance of ventilation, mixing, respiration, and photosynthesis. We present hydrographic cruise observations of declining dissolved oxygen collected along CalCOFI Line 66.7 (Line 67) off of Monterey Bay, in the Central California Current region, and investigate likely mechanisms. Between 1998 and 2013, dissolved oxygen decreased at the mean rate of 1.92 µmol kg−1 year−1 on σθ 26.6–26.8 kg m−3 isopycnals (250–400 m), translating to a 40% decline from initial concentrations. Two cores of elevated dissolved oxygen decline at 130 and 240 km from shore, which we suggest are a California Undercurrent and a California Current signal respectively, occurred on σθ ranges of 26.0–26.8 kg m−3 (100–400 m). A box model suggests that small annual changes in dissolved oxygen in source regions are sufficient to be the primary driver of the mid-depth declines. Variation in dissolved oxygen at the bottom of the surface mixed layer suggests that there is also a signal of increased local remineralization.Alice S. RenFei ChaiHuijie XueDavid M. AndersonFrancisco P. ChavezNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alice S. Ren Fei Chai Huijie Xue David M. Anderson Francisco P. Chavez A Sixteen-year Decline in Dissolved Oxygen in the Central California Current
description	Abstract A potential consequence of climate change is global decrease in dissolved oxygen at depth in the oceans due to changes in the balance of ventilation, mixing, respiration, and photosynthesis. We present hydrographic cruise observations of declining dissolved oxygen collected along CalCOFI Line 66.7 (Line 67) off of Monterey Bay, in the Central California Current region, and investigate likely mechanisms. Between 1998 and 2013, dissolved oxygen decreased at the mean rate of 1.92 µmol kg−1 year−1 on σθ 26.6–26.8 kg m−3 isopycnals (250–400 m), translating to a 40% decline from initial concentrations. Two cores of elevated dissolved oxygen decline at 130 and 240 km from shore, which we suggest are a California Undercurrent and a California Current signal respectively, occurred on σθ ranges of 26.0–26.8 kg m−3 (100–400 m). A box model suggests that small annual changes in dissolved oxygen in source regions are sufficient to be the primary driver of the mid-depth declines. Variation in dissolved oxygen at the bottom of the surface mixed layer suggests that there is also a signal of increased local remineralization.
format	article
author	Alice S. Ren Fei Chai Huijie Xue David M. Anderson Francisco P. Chavez
author_facet	Alice S. Ren Fei Chai Huijie Xue David M. Anderson Francisco P. Chavez
author_sort	Alice S. Ren
title	A Sixteen-year Decline in Dissolved Oxygen in the Central California Current
title_short	A Sixteen-year Decline in Dissolved Oxygen in the Central California Current
title_full	A Sixteen-year Decline in Dissolved Oxygen in the Central California Current
title_fullStr	A Sixteen-year Decline in Dissolved Oxygen in the Central California Current
title_full_unstemmed	A Sixteen-year Decline in Dissolved Oxygen in the Central California Current
title_sort	sixteen-year decline in dissolved oxygen in the central california current
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/6c12fdf7452d4d0780bffc2f2bb7c5e1
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A Sixteen-year Decline in Dissolved Oxygen in the Central California Current

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