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首页> 外文期刊>Geophysical Research Letters >Distribution of icebergs in the Atlantic and Indian ocean sectors of the Antarctic region and its possible links with ENSO
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Distribution of icebergs in the Atlantic and Indian ocean sectors of the Antarctic region and its possible links with ENSO

机译：南极洲大西洋和印度洋冰山的分布及其与ENSO的可能联系

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摘要

The spatial distribution and multiyear variability of iceberg concentration in the Atlantic and Indian ocean sectors of the Antarctic region have been studied using ship-borne observations of iceberg occurrence. The collected dataset includes more than 40,000 reports predominantly from Russian and Australian research vessels made over the last 36 years (1970 - 2005). The analysis of the data has revealed a gradual decrease in the iceberg concentration away from the coast of Antarctica and a substantial variation along the coast line. Large concentration of icebergs was found in the Weddell Sea and north-east of the Antarctic Peninsula. Several regions in the Atlantic and Indian Ocean sector of Antarctica have been identified where yearly anomalies of the iceberg occurrence exhibit a noticeable correlation with El Nino/Southern Oscillation (ENSO) events. The strongest ENSO effect was observed in the region east of Drake Passage where the iceberg concentration increased by about 50% during years of the negative Southern Oscillation Index (SOI) phase. The change in the iceberg amount is explained by an increased iceberg drift into this region from the southern part of Weddell Sea and from Pacific Ocean. The latter is caused by anomalous surface pressure High and associated anticlockwise circulation around the pressure anomaly developing in the south-eastern part of Pacific Ocean during the negative phase of ENSO.
机译：南极地区大西洋和印度洋海域冰山浓度的空间分布和多年变化，已经通过船载冰山的观测资料进行了研究。收集的数据集包括40,000多个报告，这些报告主要来自过去36年（1970年至2005年）的俄罗斯和澳大利亚研究船。数据分析显示，远离南极海岸的冰山浓度逐渐降低，沿海岸线的变化很大。在韦德尔海和南极半岛东北部发现大量冰山。已经确定了南极洲大西洋和印度洋地区的几个区域，其中冰山的年度异常与厄尔尼诺/南方涛动（ENSO）事件表现出明显的相关性。在德雷克海峡以东地区观测到的ENSO效应最强，在南方涛动指数（SOI）负数年期间，冰山浓度增加了约50％。冰山数量的变化可以通过从韦德尔海南部和太平洋进入该地区的冰山漂移增加来解释。后者是由ENSO负相期间太平洋东南部发展的表面异常高压和相关的逆时针环流引起的。

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