Declining O2 in the Canada Basin Halocline Consistent With Physical and Biogeochemical Effects of Pacific Summer Water Warming
Journal of Geophysical Research: Oceans(2023)
Abstract
Abstract The Arctic Ocean's Canada Basin (CB) has seen significant changes in ocean properties in the past two decades. A prominent change has been a warming of the Pacific Summer Water (PSW) layer in the central CB. The corresponding change in dissolved oxygen (O 2 ) is analyzed here to provide additional insight into PSW physics and biology, pathways, and evolution. O 2 observations are analyzed between 2003 and 2021 from the Joint Ocean Ice Study/Beaufort Gyre Observing System (JOIS/BGOS) field program, which samples CB hydrographic and biogeochemical properties. In the central CB, warming of the PSW layer over 2003–2021 has been accompanied by O 2 decreases over this time in the layer. Nutrients and other biogeochemical properties are analyzed to quantify the combined influences of both physical changes and biological changes on the evolution of O 2 concentrations in the CB PSW. In the upper portion of the PSW, O 2 decreases can be entirely accounted for by surface warming (and corresponding decrease in O 2 solubility) of its source waters in the Chukchi Sea region. In the deeper portion of the PSW layer, the observed O 2 changes are larger, and are accounted for by a combination of the decreased solubility effect due to warming, and increased organic matter breakdown in warmer waters. Decreasing O 2 in a warming Arctic Ocean is consonant with O 2 trends in the warming global oceans, and highlights the need for continued observations and analyses.
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Key words
canada basin halocline consistent,pacific summer water warming,biogeochemical effects
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