Contrasting patterns of river runoff and sea-ice melted water in the Canada Basin

Tong, Jinlu; Chen, Min; Qiu, Yusheng; Li, Yanping; Cao, Jianping

doi:10.1007/s13131-014-0488-4

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…A possible explanation is that air‐seawater exchange proceeds only slowly. Salinity at W03′ was 28.2, suggesting the significant influence of riverine input or sea‐ice melt (Tong et al, ) leading to high concentrations of CUPs in seawater, although this does not increase atmospheric concentrations. Furthermore, stations W11′/A14 and W14′/A15 are located in the open sea at relatively low latitudes where such influences are negligible.…”

Section: Resultsmentioning

confidence: 99%

Spatial Distributions and Seasonal Changes of Current‐Use Pesticides from the North Pacific to the Arctic Oceans

et al. 2019

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Distributions of eight targeted current‐use pesticides (CUPs) chloroneb, simazine, atrazine, alachlor, dacthal, chlorobenzilate, methoxychlor, and permethrin were investigated in seawater and the atmosphere in a region covering the North Pacific to the Arctic Oceans during the 7th and 8th Chinese National Arctic Research Expedition (2016 and 2017) voyages of the research vessel R/V Xuelong (Snow Dragon in English). Total CUP concentrations in seawater have prominent seasonal and latitudinal trends, with higher concentrations occurring at lower latitudes in early summer. The major contributors of the CUPs (∑8CUP) did not alter over different seasons with dominant chloroneb, alachlor, and atrazine accounting for more than 90%, but their concentrations did have marked seasonal changes. However, the compositions of the eight analyzed CUPs varied indistinctly between seasons indicating a possible combined environmental impact on these compounds rather than the effects of individual chemical properties. Three‐day backward air mass trajectories indicate that atmospheric masses from northeastern China are responsible for the high concentrations of CUPs in East China and Japan Seas, whereas those from the North Atlantic Ocean contribute to the low levels in local area. Fugacity ratios indicate potential volatilization and equilibrium of chloroneb in the Canada Basin of the Arctic Ocean and Japan Sea, respectively, and deposition of other CUPs in both regions. However, atmospheric concentrations are decoupled from those in seawater, which indicates a low exchange rate.

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Section: Resultsmentioning

confidence: 99%

Spatial Distributions and Seasonal Changes of Current‐Use Pesticides from the North Pacific to the Arctic Oceans

et al. 2019

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“…The salinity in surface water decreased offshore along the transect (Figure b), which is consistent with previous observations [e.g., Rutgers Van der Loeff et al ., ; Kadko and Muench , ]. The f mw values ranged from 0 to 20% (Figure d), which agree with earlier estimates of meteoric water in the western Arctic Ocean [ Chen et al ., ; Pan et al ., ; Tong et al ., ].…”

Section: Resultsmentioning

confidence: 99%

Size characteristics of chromophoric dissolved organic matter in the Chukchi Sea

et al. 2016

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With the Arctic warming, terrestrial input plays a more important role in carbon cycle in the Arctic Ocean than before. Chromophoric dissolved organic matter (CDOM) as a tracer of terrestrial dissolved organic matter (tDOM) becomes more valuable in elucidating the source and compositions of DOM. Although measurements of DOM in the Arctic Ocean have been widely reported, characteristics of high molecular weight colloids are still poorly understood. In this study, the bulk absorbance and size fractograms of CDOM were measured in the Chukchi Seas using an asymmetrical flow field‐flow fractionation (AF4) coupled online with UV‐vis detectors. Both CDOM a254, absorption coefficient at 254 nm, and the integrated UV254 (from AF4 UV‐vis detector) of three colloidal fractions (1–10, 10–100, and >100 kDa) significantly correlated with the fraction of meteoric water (fmw) calculated from δ18O in seawater, which indicates that the CDOM was mainly derived from terrestrial input and a254 is a potential tracer of tDOM in the Chukchi Sea. Compared with the larger colloidal fractions (10–100 and >100 kDa), the smaller colloidal fraction (1–10 kDa) showed a stronger correlation with the fmw, suggesting the smaller colloids were of mostly terrigenous origin. Values of field measured spectral slope at 275–295 nm (s275–295), a tDOM proxy, were significantly lower than the model‐estimated s275–295 calculated from the MODIS Aqu satellite remote sensing data, which indicated that terrestrial input of CDOM derived from model calculation was likely underestimated in the Chukchi Sea.

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“…Stable oxygen isotopes of seawater samples were analyzed after equilibration of H 2 O‐CO 2 using a Delta plus XP mass spectrometer with a precision of ± 0.02‰ and calibrated against Vienna Standard Mean Ocean Water (Tong et al ). The values of H 2 δ 18 O in seawater are presented in Table .…”

Section: Sampling and Methodsmentioning

confidence: 99%

Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean

Fang

Yang

Chen

et al. 2018

Limnology & Oceanography

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Dissolved black carbon (DBC) is one of the largest pools of molecularly identifiable carbon in the ocean. In the deep ocean, DBC appears to persist for millennia, whereas it can be rapidly degraded by sunlight in surface waters. In Antarctica, the downward transport of dense shelf water (DSW) exports a massive volume of water to the deep Southern Ocean each year. If this sinking DSW is enriched in DBC, it may allow a route for DBC to escape degradation by sunlight in the surface ocean and become sequestered in the deep waters of the global ocean. To investigate this possibility, we quantified dissolved organic carbon (DOC), DBC, and ancillary properties in the waters of an Antarctic shelf sea (Prydz Bay) and adjacent waters. DBC concentrations in Prydz Bay DSW (1.2 ± 0.3 μmol L−1) were elevated compared to those in circumpolar deep water (0.49 ± 0.07 μmol L−1). The water column distribution of DBC in Prydz Bay suggested that sediments were the main source of DBC in DSW. A mixing model incorporating seawater oxygen isotopes (H2δ18O) indicated that Prydz Bay DSW transported DBC and DOC into the deep Southern Ocean. We estimate that the downward transport of DSW from Prydz Bay could contribute 4–9% (66–150 Gg yr−1) and 2–4% (3700–8500 Gg yr−1) to the DBC and DOC concentrations in Antarctic Bottom Water, respectively. Thus, the downward transport of DBC along the Antarctic shelf/slope is likely a significant source of DBC to the deep waters of the Southern and Global Ocean.

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Contrasting patterns of river runoff and sea-ice melted water in the Canada Basin

Cited by 8 publications

References 31 publications

Spatial Distributions and Seasonal Changes of Current‐Use Pesticides from the North Pacific to the Arctic Oceans

Spatial Distributions and Seasonal Changes of Current‐Use Pesticides from the North Pacific to the Arctic Oceans

Size characteristics of chromophoric dissolved organic matter in the Chukchi Sea

Transport of dissolved black carbon from the Prydz Bay Shelf, Antarctica to the deep Southern Ocean

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