...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Temperature, salinity, and density variability in the central Middle Atlantic Bight
【24h】

Temperature, salinity, and density variability in the central Middle Atlantic Bight

机译：中大西洋大西洋中部的温度，盐度和密度变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Four years of sustained glider observations are used to compute the seasonal cycle of hydrographic fields in the central Middle Atlantic Bight (MAB). Results reveal a large phase lag in near bottom temperatures, with peak values occurring in September at the inner shelf, in October at the mid shelf, and in November at the outer shelf. Unlike the northern MAB, the seasonal cycle explains over 70% of the near-surface salinity variability. At the inner shelf and offshore near the bottom, however, most of the variance is due to pulses in river discharge and to shifts in the position of the shelfbreak front. Cross-shelf density gradients inshore of the 60-m isobath are dominated by salinity during winter and spring, with temperature contributing significantly from August to October. This is because bottom waters near the coast are warm due to the deepening of the thermocline during fall, but offshore waters are still influenced by the cold pool. The vertical stratification seasonal variability is also large. Early in the year, stratification is small and entirely due to salinity. By May, salinity still dominates vertical gradients near the coast, but temperature and salinity contribute equally to the density stratification offshore. During summer, stratification is dominated by temperature. Temperature interannual variability was small during the sampling period, but surface salinity was anomalously low by 1.2 psu in summer 2006. The anomaly was due to larger than average discharge from the Hudson River in early summer during a period of strong upwelling favorable winds.
机译：使用四年的持续滑翔机观测来计算中大西洋大西洋中部（MAB）的水文学场的季节性周期。结果表明，在接近底部温度时存在较大的相位滞后，峰值出现在9月的内层架，10月的中层架和11月的外层架。与北部的MAB不同，季节周期解释了近地表盐度变化的70％以上。但是，在内部架子和底部附近的海上，大部分变化是由于河流排放的脉冲以及架子断裂前沿位置的变化引起的。在冬季和春季，盐度在60米等深线的近海跨架密度梯度中占主导地位，而温度在8月至10月的贡献最大。这是因为在秋季，由于温跃层的加深，海岸附近的底水变暖，而近海仍然受到冷池的影响。垂直分层的季节性变化也很大。在今年年初，分层很小，完全是由于盐度造成的。到五月，盐度仍将主导海岸附近的垂直梯度，但温度和盐度对近海密度分层的贡献同等。在夏季，分层主要由温度决定。在采样期间，温度的年际变化很小，但在2006年夏季，表面盐度异常低，为1.2 psu。该异常是由于在强上升气流期间初夏哈德逊河的排水量大于平均水平。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号