The distribution of pelagic sound scattering layers across the southwest Indian Ocean
The distribution of pelagic sound scattering layers across the southwest Indian Ocean
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DOI：
10.1016/j.dsr2.2015.06.023
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发表时间：
2017-02-01
影响因子：
3
通讯作者：
Brierley, Andrew S.
中科院分区：
文献类型：
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作者：
Boersch-Supan, Philipp H.;Rogers, Alex D.;Brierley, Andrew S.
利用分波束测深仪对西南印度洋浅层和深层散射层（SLs）进行了垂直分布和地理分布研究。采用聚类分析对垂直散射剖面进行客观分类。利用具有空间误差结构的广义加性混合模型（GAMMs）对后向散射和环境协变量之间的相关性进行建模。在亚南极锋中发现了结构上不同的SL体系。gms结果表明，海面温度与平均体积后向散射密切相关，副热带辐合带的后向散射显著升高。散射层生物群的非均匀分布反映了调查区域的生物地理地带性，并可能对印度洋捕食者的觅食和碳循环产生影响。(C) 2015 Elsevier Ltd.版权所有。
Shallow and deep scattering layers (SLs) were surveyed with split-beam echosounders across the southwest Indian Ocean (SWIO) to investigate their vertical and geographical distribution. Cluster analysis was employed to objectively classify vertical bacicscatter profiles. Correlations between back scatter and environmental covariates were modelled using generalized additive mixed models (GAMMs) with spatial error structures. Structurally distinct SL regimes were found across the Subantarctic Front. GAMMs indicated a close relationship between sea surface temperature and mean volume backscatter, with significantly elevated bacicscatter in the subtropical convergence zone. The heterogeneous distribution of scattering layer biota reflects the biogeographic zonation of the survey area and is likely to have implications for predator foraging and carbon cycling in the Indian Ocean. (C) 2015 Elsevier Ltd. All rights reserved.