Bioavailable dissolved organic matter and biological hot spots during austral winter in Antarctic waters Journal of Geophysical Research: Oceans
收藏NOAA Institutional Repository2023-09-13 更新2026-04-25 收录
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https://doi.org/10.1002/2016jc012301
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Primary production and heterotrophic bacterial activity in the Antarctic Ocean are generally low during the austral winter. Organic carbon is considered to be a major factor limiting bacterialmetabolism, but few studies have investigated the bioavailability of organic matter during winter. Herein, the chemical composition and bioavailability of dissolved organic matter (DOM) were investigated in surface (5–100 m) and mesopelagic (200–750 m) waters off the northwestern Antarctic Peninsula duringAugust 2012. Concentrations of dissolved organic carbon (DOC) were low (42 64mmol L 21) and showed no apparent spatial patterns. By contrast, the composition of DOM exhibited significant spatial trends that reflected varying ecosystem productivity and water masses. Surface distributions of chlorophyll- aand par-
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NOAA
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2023-09-13
