Estimation of vertical diffusion coefficient based on a one-dimensional temperature diffusion equation with an inverse method

Liang, Hui; Zhao, Wei; Dai, Dejun; Zhang, Jun

doi:10.1007/s13131-014-0472-z

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…The widely used mass-balance model for 210 Po (Bacon et al, 1976) was adopted by incorporating advection and diffusion processes. In general, except for upwelling and mesoscale eddy, vertical advection and horizontal diffusion terms are far smaller than vertical diffusion and horizontal advection (Liang et al, 2014). Thus, we only considered the horizontal advection and vertical diffusion.…”

Section: Po-derived Export Flux Of Sootmentioning

confidence: 99%

Utilization of Soot and 210 Po-210 Pb Disequilibria to Constrain Particulate Organic Carbon Fluxes in the Northeastern South China Sea

et al. 2021

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Black carbon (BC) is believed to be refractory and thus affects the timescale of organic carbon conversion into CO2 and the magnitude of the sink of CO2. However, the fate of BC in the oceans remains poorly understood. Here, 210Po and 210Pb were measured to examine the export of soot in the northeastern South China Sea (SCS). Concentrations of soot decreased from 0.141 ± 0.021 μmol-C L–1 (mean ± SD) in the mixed layer (0–30 m) to 0.087 μmol-C L–1 at the euphotic base (150 m) due to potential photodegradation within the euphotic zone. In the twilight zone, however, the soot showed an increasing pattern along with the total particulate matter and total particulate organic carbon (POC) contents, corresponding to additions from the shelf/slope sediment resuspension through lateral transport. Using the deficits of 210Po, the export flux of soot from the euphotic zone was calculated to be 0.172 ± 0.016 mmol-C m–2 d–1 and increased with depth. Assuming that the soot is entirely refractory below the euphotic zone, the sediment-derived soot fluxes were estimated based on the increase in soot fluxes relative to the base of the euphotic zone, with values varying from 0.149 ± 0.030 to 0.96 ± 0.10 μmol-C L–1. This indicates that sediment resuspension is an important source of soot to the ocean interior in the SCS. Coupling the sediment-derived soot and 210Po-derived POC fluxes gave rise to a Martin Curve-like flux attenuation of local euphotic zone-derived POC in the twilight zone with b value of 0.70 ± 0.01. These results suggest that soot could be useful for constraining in situ POC fluxes and their transport.

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Section: Po-derived Export Flux Of Sootmentioning

confidence: 99%

Utilization of Soot and 210 Po-210 Pb Disequilibria to Constrain Particulate Organic Carbon Fluxes in the Northeastern South China Sea

et al. 2021

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“…The dried residue of ethyl acetate extraction was further extracted with acetonitrile-water (2 : 8). The ethyl acetate soluble fraction was subjected to a series of reverse-phase column and silica gel column chromatography to afford a known triterpene, squa-sapogenol (1, 20 mg), 10,11) and a new triterpene glycoside 2 (36 mg). The extract with acetonitrile-water (2 : 8) was subjected to another series of reverse-phase column and Sephadex LH20 column chromatography to isolate a known triterpene glycoside, macedonoside C (3, 26 mg), 2) and three new triterpene glycosides 4 (68 mg), 5 (34 mg), and 6 (14 mg).…”

Section: Isolation Of Triterpene and Triterpene Glycosides From Undermentioning

confidence: 99%

“…The aglycone of bucharosides A (4), C (6) and D (2) is squasapogenol (1, olean-11 (12),13(18)-diene-3β,22β-diol), which was reported from Glycyrrhiza squamulosa and Hedysarum gmelinii. 10,11) The aglycone of bucharoside B (5) and macedonoside C (3) is macedonic acid (olean-11(12),13-(18)-diene-3β,21α-diol-29-ic acid), which was isolated from many Glycyrrhiza species as an aglycone of triterpene glycosides. 2,3,9) These olean-11 (12),13(18)-diene triterpenes are major aglycones of triterpene glycosides isolated from glycyrrhizinnon-producing Glycyrrhiza species, such as G. macedonica, G. echinata, G. pallidiflora and G. yunnanensis.…”

Section: Isolation Of Triterpene and Triterpene Glycosides From Undermentioning

confidence: 99%

Field Survey of <i>Glycyrrhiza</i> Plants in Central Asia (5). Chemical Characterization of <i>G. bucharica</i> Collected in Tajikistan

et al. 2019

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One triterpene and five triterpene glycosides, including four new compounds, have been identified in the underground parts of Glycyrrhiza bucharica, which was shown to be closely related to Glycyrrhizinproducing Glycyrrhiza species, G. uralensis, G. glabra and G. inflata, based on their chloroplast rbcL sequences. Two known compounds were identified squasapogenol and macedonoside C. The structures of four new compounds, bucharosides

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The Changing Bohai and Yellow Seas: A Physical View

Wei

Zhang

Yang

et al. 2020

Atmosphere, Earth, Ocean &Amp; Space

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Estimation of vertical diffusion coefficient based on a one-dimensional temperature diffusion equation with an inverse method

Cited by 3 publications

References 28 publications

Utilization of Soot and 210 Po-210 Pb Disequilibria to Constrain Particulate Organic Carbon Fluxes in the Northeastern South China Sea

Utilization of Soot and 210 Po-210 Pb Disequilibria to Constrain Particulate Organic Carbon Fluxes in the Northeastern South China Sea

Field Survey of <i>Glycyrrhiza</i> Plants in Central Asia (5). Chemical Characterization of <i>G. bucharica</i> Collected in Tajikistan

The Changing Bohai and Yellow Seas: A Physical View

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