Reactive iron and manganese distributions in seabed sediments near small mountainous rivers off Oregon and California (USA)

Roy, Moutusi; McManus, James; Goñi, Miguel A.; Chase, Zanna; Borgeld, Jeffry C.; Wheatcroft, Robert A.; Muratli, Jesse M; Megowan, Meghan; Mix, Alan C

doi:10.1016/j.csr.2012.12.012

Cited by 38 publications

(42 citation statements)

References 64 publications

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“…A synthesis of available evidence indicates that, as in the wet-tropical semi-enclosed bays, Fe HR appears to be also enriched to some extent in the temperate semi-enclosed bay relative to the ECS and global marine sediments. (Raiswell and Canfield, 1998), ocean average (average of continental margin and deep sea) (Raiswell and Canfield, 1998), tropical semi-enclosed bays, Saint Lucia, Lesser Antilles (Ku et al, 2008), and coastal sea near small mountainous river (SMR) off Oregon and California (Roy et al, 2013). Fe HR ¼ Fe py þ BCD-Fe (Raiswell and Canfield, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…It is commonly observed that Fe(III) HR and TOC co-vary in surface sediments (Berner, 1970;Wagai and Mayer, 2007;Lalonde et al, 2012;Zhu et al, 2012b;Roy et al, 2013). Potential mechanisms for the co-variation, albeit not well understood, are that they share common sources and/or interact (for example, formation of iron oxide-OM complexes/aggregates through adsorption, coprecipitation and aggregation) have facilitated their mutual preservation during transport and post-depositional diagenesis (Poulton and Canfield, 2005;Lalonde et al, 2012;Riedel et al, 2013).…”

Section: Fe(iii) Oxidesmentioning

confidence: 96%

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Iron geochemistry in surface sediments of a temperate semi-enclosed bay, North China

Zhu

Huang

Yang

et al. 2015

Estuarine, Coastal and Shelf Science

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Section: Discussionmentioning

confidence: 99%

Section: Fe(iii) Oxidesmentioning

confidence: 96%

Iron geochemistry in surface sediments of a temperate semi-enclosed bay, North China

Zhu

Huang

Yang

et al. 2015

Estuarine, Coastal and Shelf Science

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“…As a contextual comparison, previous estimates of total fluvial POC fluxes along the North Pacific margin (8°N to 45°N) range from 0.3 to 2.4 Tg C yr −1 [ Alin et al ., ] and the total flux of CO 2 across air‐sea interface from the coastal region is ~2 Tg C yr −1 [ Chavez et al ., ]. Although there are huge uncertainties and natural variability in these estimates, they suggest that small mountainous rivers play an important role in the biogeochemistry of this coastal margin that extends beyond sediment inputs [e.g., Inman and Jenkins , ; Wheatcroft and Sommerfield , ] and includes allochthonous fluxes of organic matter [ this study ; Hastings et al ., ], nutrients [ Wetz et al ., ], and trace metals [ Roy et al ., ].…”

Section: Discussionmentioning

confidence: 99%

Particulate organic matter export by two contrasting small mountainous rivers from the Pacific Northwest, U.S.A.

et al. 2013

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[1] We investigated the export of particulate organic matter (POM) to the ocean by two contrasting small, mountainous rivers, the Umpqua and Eel Rivers, by collecting suspended sediment samples over a range of discharges and analyzing them for a variety of constituents, including organic carbon, nitrogen, biomarkers with distinct biochemical sources, and isotopic compositions (d 13 C and Δ 14 C). Concentrations of all measured constituents in both rivers increased as a function of discharge, resulting in their export being dominated by short-lived, wintertime high-discharge events. In the Umpqua River, marked compositional contrasts between low-and high-discharge conditions were consistent with a shift in the provenance of POM from biogenic sources dominated by non-vascular plant sources at low flows to contributions from vascular plant sources of moderate 14 C ages (~300 years before present) dominating at high flows. In contrast, POM from the Eel River, which was highly diluted by mineral sediment at all discharges, had significant contributions from petrogenic sources and displayed lower concentrations of recognizable biomarkers. Both rivers had comparable yields of biogenic POM, which appeared to be moderately degraded and originated primarily from surface soils in erosion prone areas of the watersheds. While tectonic/ geologic differences help explain the contrasts in sediment and petrogenic POM yields between the two watersheds, ecological factors such as vegetation coverage, productivity, and soil carbon are more important in influencing the composition of biogenic POM mobilized from these systems.

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“…Along the continental margin, productivity is supported by nutrient and iron inputs from rivers and shelf sediments in addition to upwelling over the continental shelf (Roy et al, 2013). Along the continental margin, productivity is supported by nutrient and iron inputs from rivers and shelf sediments in addition to upwelling over the continental shelf (Roy et al, 2013).…”

Section: Study Regionmentioning

confidence: 99%

North Pacific Paleotemperature and Paleoproductivity Reconstructions Based on Diatom Species

Lopes

Mix

2018

Paleoceanog and Paleoclimatol

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Regionally developed diatom‐based transfer functions reconstruct both summer sea surface temperature and primary productivity (PP) in the North Pacific based on a calibration data set including the eastern subtropical gyre (California and Oregon), the Gulf of Alaska, the western Pacific, and Bering Sea. Factors of the floral assemblage and environment data sets, and canonical correspondence, support estimation of two essentially orthogonal variables. Validation of the summer sea surface temperature transfer function resulted in r2jack of 0.9 and a root‐mean‐square error of prediction of 1.0°C over a range of 7–17°C. The summer PP transfer function yielded r2jack of 0.7 and a root‐mean‐square error of prediction of 219 g C·m2·year over a range of 200–2,000 g C·m2·year. Application in downcore locations within the modern nearshore upwelling regime and within the California Current offshore Oregon reveals that during Holocene time higher PP (>800 g C·m2·year) was associated with cooler temperatures (<16°C) forced by upwelling. In contrast, during the Last Glacial Maximum, when subpolar conditions are present off Oregon, higher PP (>1,000 g C·m2·year) was associated with warmer SSTs (>10°C; significant in the nearshore site). This finding supports previous hypotheses that in cold regimes warming may augment biological production, perhaps by relieving metabolic constraints. This is of particular interest because of projected amplification of future warming in high latitudes and the potential for greening of the subpolar and polar oceans.

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Reactive iron and manganese distributions in seabed sediments near small mountainous rivers off Oregon and California (USA)

Cited by 38 publications

References 64 publications

Iron geochemistry in surface sediments of a temperate semi-enclosed bay, North China

Iron geochemistry in surface sediments of a temperate semi-enclosed bay, North China

Particulate organic matter export by two contrasting small mountainous rivers from the Pacific Northwest, U.S.A.

North Pacific Paleotemperature and Paleoproductivity Reconstructions Based on Diatom Species

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