...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Ocean and Ice Shelf Tides from CryoSat-2 Altimetry
【24h】

Ocean and Ice Shelf Tides from CryoSat-2 Altimetry

机译：CryoSat-2高程的海洋和冰架潮汐

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

Anew empirical model of ocean tides has been developed for the Weddell Sea, south of 668 degrees S, between 90 degrees W and 0 degrees, using six years of radar altimeter data from the CryoSat-2 satellite mission. Because of its long ground-track repeat period (368 days) and its diverse measurement modes, low-rate mode (LRM) over the ocean and synthetic aperture radar interferometric mode (SARin) over ice surfaces and parts of the ocean, the CryoSat-2 data pose a number of challenges for tidal analysis. The space and time sampling properties of the exact repeat, near-repeat, and crossover ground tracks have been analyzed to discover which tides may be estimated using a combination of conventional harmonic analysis and local spatial regression. Using this information, the M-2, S-2, K-2, N-2, K-1, O-1, P-1, and Q(1) tides have been mapped for both the ocean and floating ice shelves in this domain. Validation against independent in situ data, along with comparison with existing tide models, finds that the CryoSat-2-derived tides are consistent with previous estimates and that they are more accurate than other models at the M-2 and S-2 frequencies. The high inclination of the CryoSat-2 orbit causes the orbit plane to precess relatively slowly, which leads to significantly less accurate estimates of the K-2 tide. This purely empirical model ought to provide improved tidal corrections for studies of low-frequency variability and secular trends in ice shelf thickness, and it suggests that further increases in quantitative accuracy could be achieved by assimilation of CryoSat-2 data into dynamical tide models.
机译：利用来自CryoSat-2卫星任务的六年雷达高度计数据，已经为南纬668度，西纬90度至0度的韦德尔海开发了新的海洋潮汐经验模型。由于其长期的地面跟踪重复周期（368天）和多样的测量模式，海洋上的低速率模式（LRM）和冰面和部分海洋上的合成孔径雷达干涉测量模式（SARin），CryoSat- 2数据对潮汐分析提出了许多挑战。已对精确重复，近重复和交叉地面轨道的空间和时间采样特性进行了分析，以发现可以使用常规谐波分析和局部空间回归的组合来估算哪些潮汐。使用此信息，已经为海洋和浮冰架绘制了M-2，S-2，K-2，N-2，K-1，O-1，P-1和Q（1）潮汐图。在这个领域。针对独立的原位数据进行验证以及与现有潮汐模型进行比较，发现CryoSat-2衍生的潮汐与之前的估计一致，并且在M-2和S-2频率下它们比其他模型更准确。 CryoSat-2轨道的高倾斜度导致轨道平面相对较慢地进动，从而导致对K-2潮汐的估计准确性大大降低。这个纯粹的经验模型应该为研究低频变化和冰架厚度的长期趋势提供改进的潮汐改正，并且表明通过将CryoSat-2数据同化为潮汐模型可以实现定量精度的进一步提高。

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