Comparison of interannual intrinsic modes in hemispheric sea ice covers and other geophysical parameters

Gloersen P.; Huang N.

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Comparison of interannual intrinsic modes in hemispheric sea ice covers and other geophysical parameters

机译：半球海冰覆盖层年际内在模态与其他地球物理参数的比较

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Recent papers have described 18-year trends and interannual oscillations in the Arctic and Antarctic sea ice extents, areas, and enclosed open water areas based on newly formulated 18.2-year ice concentration time series. They were obtained by fine-tuning the sea ice algorithm tie points individually for each of the four sensors used to acquire the data. In this paper, these analyses are extended to an examination of the intrinsic modes of these time series, obtained by means of empirical mode decomposition, which handles both nonstationary and nonlinear data as found in these time series, unlike filtering techniques based on Fourier analysis. Our analysis centers on periodicities greater than one year. Quasi-biennial and quasi-quadrennial oscillations similar to those observed earlier with a multitaper-filtered Fourier analysis technique were also observed. The intrinsic modes described feature frequency as well as amplitude modulation within their respective frequency bands. The slowest varying mode in the Antarctic sea ice cover has slightly less than a full period during this 18.2-year time period, but the change in sign of its curvature hints at a modal period of about 19 years, with important implications for the trend analyses published earlier.

机译：最近的论文基于新制定的18.2年冰浓度时间序列，描述了北极和南极海冰范围，区域和封闭的开放水域的18年趋势和年际振荡。它们是通过分别微调用于获取数据的四个传感器中每一个的海冰算法联系点而获得的。在本文中，这些分析扩展到对这些时间序列的固有模式的检查，该模式是通过经验模式分解获得的，该方法处理了在这些时间序列中发现的非平稳和非线性数据，这与基于傅立叶分析的过滤技术不同。我们的分析集中于大于一年的周期性。还观察到了类似于每两年一次和准每四年一次的振荡，这种振荡与之前使用多锥滤波傅里叶分析技术观察到的振荡相似。本征模式描述了其各自频带内的频率和幅度调制。在这18.2年的时间段内，南极海冰盖最慢的变化模式略小于整个周期，但其曲率变化标志着大约19年的模态周期，这对趋势分析具有重要意义。较早出版。

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《IEEE Transactions on Geoscience and Remote Sensing.》 |2003年第5期|p.62-74|共13页
作者
Gloersen P.; Huang N.;
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作者单位

NASA Goddard Space Flight Center, Greenbelt, MD, USA;

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正文语种 eng
中图分类无线电电子学、电信技术;
关键词
sea ice; remote sensing; microwave measurement; geophysical measurements; microwave measurements; remote sensing; hemispheric sea ice cover; geophysical parameters; interannual intrinsic modes; Arctic sea ice extent; Antarctic sea ice extent; enclose;

机译：海冰;遥感;微波测量;地球物理测量;微波测量;遥感;半球海冰覆盖;地球物理参数;年际内在模式;北极海冰范围;南极海冰范围;括;

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Comparison of interannual intrinsic modes in hemispheric sea ice covers and other geophysical parameters

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