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首页> 外文期刊>Journal of marine systems: journal of the European Association of Marine Sciences and Techniques >Continuous shipboard measurements of oceanic δ~(18)O, δD and δ~(13)C_(DIC) along a transect from New Zealand to Antarctica using cavity ring-down isotope spectrometry
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Continuous shipboard measurements of oceanic δ~(18)O, δD and δ~(13)C_(DIC) along a transect from New Zealand to Antarctica using cavity ring-down isotope spectrometry

机译：使用腔衰荡同位素分析法连续测量从新西兰到南极洲的一条样线的海洋δ〜（18）O，δD和δ〜（13）C_（DIC）

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摘要

Cavity ring-down spectrometers,with automated sampling interfaces, were deployed to allowmeasurements of water isotopes (δ~(18)O, δD) and dissolved inorganic carbon (δ~(13)C_(DIC)) stable isotope ratios at high temporal resolution along a transect from New Zealand to the Antarctic continental shelf. Measurements every 10 min for δ~(18)O and δD, 15 min for DIC yielded 2499 and 2289 discretemeasurements respectively. High resolution data enabled the delineation of water mass boundaries as well as revealing insights into surface hydrological and biological processes. δ~(18)O, δD, and δ~(13)C_(DIC) decreased southwards, dropping by approximately 1.0‰, 7.0‰, and 0.5‰, respectively. Though the decline in δ~(13)C_(DIC) with latitude was generally linear, the drop in δ~(18)O and δD was punctuated by areas of rapid, significant change corresponding to the Sub-Tropical, Sub-Antarctic and Polar Fronts. North of the Sub-Antarctic Front (approx. 54.5°S) the dominant control on water and DIC isotopes was the precipitation– evaporation balance and the contribution of upwelling waters, respectively. Further south, in close proximity to the sea ice and on the Antarctic shelf, water isotope values weremore variable and predominantly influenced by the melting/freezing of sea-ice coupled to inputs from glacial/snow melt water. Local increases in δ~(13)C_(DIC)were likely due to photosynthetic enrichment of the DIC pool. Using this newinstrumentation has provided one of the most comprehensive oceanic transect data sets yet achieved and illustrates the potential of these methods to delineate discrete watermasses and advance our knowledge of both water and inorganic carbon cycling processes in the ocean. This methodology, combining high-resolution isotopic measurements with hydrographic data, has significant benefits in modelling water mixing in locations with multiple sources and controlling processes.
机译：配备自动采样接口的腔衰荡光谱仪可用于以高时间分辨率测量水同位素（δ〜（18）O，δD）和溶解的无机碳（δ〜（13）C_（DIC））稳定同位素比沿着从新西兰到南极大陆架的样带。对于δ〜（18）O和δD，每10分钟测量一次;对于DIC，每15分钟测量一次，分别产生2499和2289次离散测量。高分辨率数据可以描绘水体边界，并揭示对地表水文和生物过程的见解。 δ〜（18）O，δD和δ〜（13）C_（DIC）向南下降，分别下降约1.0‰，7.0‰和0.5‰。尽管δ〜（13）C_（DIC）随纬度的下降通常是线性的，但δ〜（18）O和δD的下降被快速，显着变化的区域所打断，对应于亚热带，亚南极和亚热带。极地战线。在南极前锋以北（约54.5°S），对水和DIC同位素的主要控制分别是降水-蒸发平衡和上升水的贡献。再往南，在靠近海冰和南极大陆架上，水的同位素值更易变化，并且主要受海冰融化/冰冻以及来自冰川/雪融水的输入的影响。 δ〜（13）C_（DIC）的局部增加可能是由于DIC库的光合富集所致。使用这种新仪器已经提供了迄今为止最全面的海洋样带数据集之一，并说明了这些方法在描述离散水体并提高我们对海洋中水和无机碳循环过程的认识方面的潜力。这种方法结合了高分辨率同位素测量和水文数据，在模拟具有多个水源和控制过程的位置的水混合方面具有显着优势。

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