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Near-surface salinity reveals the oceanic sources of moisture for australian precipitation through atmospheric moisture transport

机译：近地表盐度揭示了通过大气水分运输的澳大利亚沉淀的海洋水分源

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The long-term trend of sea surface salinity (SSS) reveals an intensification of the global hydrological cycle due to human-induced climate change. This study demonstrates that SSS variability can also be used as a measure of terrestrial precipitation on in-terseasonal to interannual time scales, and to locate the source of moisture. Seasonal composites during El Nino-Southern Oscillation/Indian Ocean dipole (ENSO/IOD) events are used to understand the variations of moisture transport and precipitation over Australia, and their association with SSS variability. As ENSO/IOD events evolve, patterns of positive or negative SSS anomaly emerge in the Indo-Pacific warm pool region and are accompanied by atmospheric moisture transport anomalies toward Australia. During co-occurring La Nina and negative IOD events, salty anomalies around the Maritime Continent (north of Australia) indicate freshwater export and are associated with a significant moisture transport that converges over Australia to create anomalous wet conditions. In contrast, during co-occurring El Nino and positive IOD events, a moisture transport divergence anomaly over Australia results in anomalous dry conditions. The relationship between SSS and atmospheric moisture transport also holds for pure ENSO/IOD events but varies in magnitude and spatial pattern. The significant pattern correlation between the moisture flux divergence and SSS anomaly during the ENSO/IOD events highlights the associated ocean-atmosphere coupling. A case study of the extreme hydroclimatic events of Australia (e.g., the 2010/11 Brisbane flood) demonstrates that the changes in SSS occur before the peak of ENSO/IOD events. This raises the prospect that tracking of SSS variability could aid the prediction of Australian rainfall.
机译：海面盐度（SSS）的长期趋势揭示了由于人诱导的气候变化导致的全球水文周期的强化。本研究表明，SSS可变性也可以用作耕作持续时间尺度的陆地降水的量度，并定位水分源。 EL Nino-Southern振荡/印度洋偶极（ENSO / IOD）活动期间的季节性复合物用于了解澳大利亚水分运输和降水的变化，以及与SSS变异性的关系。随着ENSO / IOD事件的发展，阳性太平洋温池地区的正面或负片异常的模式，并伴随着澳大利亚的大气水分运输异常。在共同发生的La Nina和负IOD事件期间，海洋大陆（澳大利亚北部）周围的咸异常表示淡水出口，与澳大利亚融合的显着水分运输有关，以产生异常的潮湿条件。相比之下，在共同发生的EL NINO和阳性IOD事件期间，澳大利亚的水分输送分歧异常导致异常的干燥条件。 SSS和大气水分运输之间的关系也适用于纯ENSO / IOD事件，但在幅度和空间模式中变化。在ENSO / IOD事件期间，水分通量分歧和SSS异常之间的显着模式相关性突出了相关的海洋气氛耦合。对澳大利亚极端循环事件（例如，2010/11 Brisbane Flood）的案例研究表明，SSS的变化发生在ENSO / IOD事件的峰之前。这提高了追踪SSS变异性的前景可以帮助预测澳大利亚降雨。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2103-2103|共1页
  • 作者

    S. RATHORE; N.L. BINDOFF; C.C. UMMENHOFER;

  • 作者单位

    Institute for Marine and Antarctic Studies University of Tasmania Hobart TAS Australia;

    Institute for Marine and Antarctic Studies University of Tasmania Hobart TAS Australia;

    Institute for Marine and Antarctic Studies University of Tasmania Hobart TAS Australia;

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