Spatial variability of water mass transports in the Bransfield Strait based on direct current measurements

IF 2.3 3区地球科学 Q2 OCEANOGRAPHY Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2024-03-22 DOI:10.1016/j.dsr.2024.104284

A.S. Gordey , D.I. Frey , I.D. Drozd , V.A. Krechik , D.A. Smirnova , S.V. Gladyshev , E.G. Morozov

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Abstract

The Bransfield Strait connects the Bellingshausen and Weddell seas and is strongly affected by intense inflows of their water masses. In this work we analyzed Shipborne Acoustic Current Doppler Profiler (SADCP) measurements carried out in the Bransfield Strait from 2015 to 2022. The new dataset includes over 100 transects, crossing the main currents in the strait (namely, the Bransfield Current and the Transitional Weddell Water (TWW) flow). Based on these data, we studied spatial variability of water mass transports in the Bransfield Strait during austral summer season. As shown below in this research, the Bransfield Current was observed down to the 600 m depth. By considering deeper layers, we managed obtaining more precise assessments of mean water mass transports of the Bransfield Current. They were estimated at 1.4–2.1 Sv. We found that the transports of the Bransfield Current and TWW flow in the austral summer season (November–March) do not show significant variability. The water mass transport of the Bransfield Current and the TWW flow was stable within the central basin of the Bransfield Strait and differed in its western basin. We also found that in austral summer the heat transport into the Bransfield Strait varied between 0.2 and 0.4 Sv·°C and salinity transport was −0.07 to −0.06 Sv·psu, their sign reflecting a dominant northeastward flow of relatively warm and fresh water. In addition, we compared Lowered Acoustic Current Doppler Profiler (LADCP) and SADCP measurements and proved that the technical limitations of the SADCP do not significantly affect the estimates of the transports in this region.

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基于直流测量的布兰斯菲尔德海峡水体输送的空间变化

布兰斯菲尔德海峡连接贝林斯豪森海和威德尔海，受到这两个海域水团强烈流入的强烈影响。在这项工作中，我们分析了 2015 年至 2022 年期间在布兰斯菲尔德海峡进行的船载声学海流多普勒剖面仪（SADCP）测量。新数据集包括 100 多个横断面，横跨海峡中的主要洋流（即布兰斯菲尔德洋流和过渡威德尔水（TWW）流）。在这些数据的基础上，我们研究了布兰斯菲尔德海峡夏季水团输送的空间变化。如下图所示，本研究观测到的布兰斯菲尔德海流最深处达 600 米。通过考虑更深层的情况，我们设法对布兰斯菲尔德海流的平均水质输送量进行了更精确的评估。据估计，其平均水量为 1.4-2.1 希沃特。我们发现，布兰斯菲尔德海流和 TWW 海流在夏季（11 月至次年 3 月）的传输量变化不大。布兰斯菲尔德洋流和荃湾洋流的水团输送在布兰斯菲尔德海峡中部海盆内比较稳定，而在其西部海盆内则有所不同。我们还发现，在澳大利亚夏季，进入布兰斯菲尔德海峡的热量输运在 0.2 到 0.4 Sv-°C 之间变化，盐度输运为-0.07 到-0.06 Sv-psu，它们的符号反映了相对温暖的淡水主要向东北方向流动。此外，我们还比较了低沉声学海流多普勒剖面仪（LADCP）和 SADCP 的测量结果，证明 SADCP 的技术局限性不会对该区域的海水输送量估算产生重大影响。

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来源期刊

Deep-Sea Research Part I-Oceanographic Research Papers 地学-海洋学

CiteScore

4.60

自引率

4.20%

发文量

144

审稿时长

18.3 weeks

期刊介绍： Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.