English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Free-drifting sediment net traps were deployed 14 times at depths between 80and 500 m for 1–3 days each during the late monsoon–intermonsoon transitionin the central Arabian Sea. Two locations (19.5 and15.5° N) were within the permanently oxygen-deficient zone (ODZ), and athird (11° N) had a shallow and thin oxygen minimum. The secondarynitrite maximum, which serves as a tracer of the ODZ, thinned from ∼ 250 m thick at stations 19.5and 15.5° N to ∼ 50 m thick at station 11° N.Overall, organic carbon fluxes ranged from 13.2 g m2 yr−1 at80 m to a minimum of 1.1 g m2 yr−1 at 500 m. Fluxes at the moreoxygenated 11° N station attenuate faster than within thepermanent ODZ. Martin curve attenuation coefficients for 19.5and 15.5° N are respectively 0.59 and 0.63 and for 11° N it is 0.98.At least six potential mechanisms might explain why particlessinking through the ODZ are more effectively transferred to depth: (M1)oxygen effects, (M2) microbial loop efficiencies and chemoautotrophy, (M3)changes in zooplankton dynamics, (M4) additions of ballast that might sorband protect organic matter from decay (M4a) or change sinking speeds (M4b),(M5) inputs of refractory organic matter and (M6) temperature effects. Thesemechanisms are intertwined, and they were explored using a combination of mineral(XPS) and organic matter characterizations of the sinking material,shipboard incubation experiments, and evaluations of existing literature.Direct evidence was found supporting an oxygen effect and/or changes in theefficiency of the microbial loop including the addition of chemoautotrophiccarbon to the sinking flux in the upper 500 m. Less direct evidence wasfound for the other potential mechanisms. A simple conceptual modelconsistent with our and other recent data suggests that the upper ODZmicrobial community determines the initial flux attenuation, and that zooplankton and sinking speed become more important deeperin the water column. Theexact interplay between the various mechanisms remains to be furtherevaluated

A multiproxy approach to understanding the &quot;enhanced&quot; flux of organic matter through the oxygen-deficient waters of the Arabian Sea

A multiproxy approach to understanding the "enhanced" flux of organic matter through the oxygen-deficient waters of the Arabian Sea