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首页> 外文期刊>Estuarine Coastal and Shelf Science >The estuarine mixing behaviour of peatland derived dissolved organic carbon and its relationship to chromophoric dissolved organic matter in two North Sea estuaries (U.K.)
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The estuarine mixing behaviour of peatland derived dissolved organic carbon and its relationship to chromophoric dissolved organic matter in two North Sea estuaries (U.K.)

机译：在两个北海河口（英国），泥炭地的河口混合溶解碳行为及其与发色性溶解有机物的关系

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The mixing behaviour of dissolved organic carbon (DOC) was investigated in two U.K. estuaries with peatland derived river inputs (Tyne and Tweed), under varying discharge regimes and in different seasons. DOC removal (i.e. non-conservative) was common to both estuaries at low salinities, but DOC addition also occurred in the Tyne at higher salinities due to inputs from a large sewage treatment works and polluted urban rivers. DOC in freshwater endmembers was in the range 608.1-2326.5 μM (mean 1229.6 μM, n = 7) for the Tyne and was 226.1 and 668.2 μM on two occasions in the Tweed; the high DOC concentrations reflecting the peatland nature of the catchments and high river discharge. DOC removal in the Tyne estuary was in the range 0—58% (n = 7) (one transect exhibits 0% removal as pollution sources of DOC dominate medium to high salinity samples so it was not possible to extrapolate a conservative mixing line back to low salinities). Highest percent removals were at highest river flows and correspondingly high turbidity and DOC concentrations in the Tyne estuary. In contrast, DOC removal in the Tweed estuary was consistently 6% (n = 2), and appeared independent of river flow, turbidity and DOC concentration on the two transects conducted. Both estuaries exhibited a strong correlation between the chromophoric dissolved organic matter (CDOM) absorption coefficient at 350 nm (a_(350)) and DOC which was seasonally robust; Tweed (r~2 = 0.98, p < 0.001, n = 20), Tyne (r~2 = 0.85, p < 0.001, n = 87) and Tyne without potentially anthropogenic or sedimentary derived DOM source samples (r~2 = 0.93, p < 0.001, n = 74). The robust nature of these relationships implies that remotely sensed CDOM characteristics have the potential to improve the spatio-temporal resolution of estuarine DOC. This study highlights the variation in estuarine removal of peatland derived DOC between the two estuaries and in the Tyne estuary it shows how differences in river regime can result in significant changes in DOC removal at low salinities. Our findings demonstrate the need to conduct DOM sampling under varying seasons and hydrological regimes to accurately quantify the removal of terrigenous DOM in estuaries and its subsequent flux to the oceans.
机译：在英国的两个河口与泥炭地的河流输入物（泰恩河和特威德河）进行了调查，研究了溶解有机碳（DOC）在不同排放方式和不同季节下的混合行为。盐度低的两个河口都普遍去除DOC（即非保守性），但是由于大型污水处理厂和污染城市河流的投入，DOC的添加也出现在盐度较高的泰恩河上。泰恩河淡水终端成员的DOC范围为608.1-2326.5μM（平均1229.6μM，n = 7），两次在特威德分别为226.1和668.2μM；高DOC浓度反映了流域的泥炭地性质和高河流量。泰恩河口的DOC去除率为0-58％（n = 7）（一个样带的去除率为0％，因为DOC的污染源主要控制着中度至高盐度样品，因此不可能将保守的混合线外推至低盐度）。最高的清除率是在河流流量最高的情况下，以及在泰恩河口的浊度和DOC浓度相应较高。相反，特威德河口的DOC去除率始终为6％（n = 2），并且与所进行的两个样带上的河流流量，浊度和DOC浓度无关。两个河口均显示出350 nm的发色溶解有机物（a_（350））与DOC的相关性强，季节性强。特威德（r〜2 = 0.98，p <0.001，n = 20），泰恩（r〜2 = 0.85，p <0.001，n = 87）和泰恩，没有潜在的人为或沉积来源的DOM来源样品（r〜2 = 0.93 ，p ＜0.001，n ＝ 74）。这些关系的稳健性意味着遥感CDOM特征具有改善河口DOC时空分辨率的潜力。这项研究强调了两个河口之间泥炭地DOC的河口清除率变化，而在泰恩河河口中，河道状况的变化如何导致低盐度下DOC清除率发生显着变化。我们的发现表明，有必要在不同的季节和水文状况下进行DOM采样，以准确量化河口中陆源DOM的去除及其随后向海洋的通量。

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