Impact of spatial aliasing on sea-ice thickness measurements
| Autor: | Jacqueline A. Richter-Menge, Cathleen A. Geiger, Hans-Reinhard Müller, E. Rachel Bernstein, Jesse P. Samluk |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Gaussian 0211 other engineering and technologies 02 engineering and technology 01 natural sciences Power law Footprint symbols.namesake Sea ice thickness Sea ice symbols Range (statistics) Aliasing (computing) Underwater Geology 021101 geological & geomatics engineering 0105 earth and related environmental sciences Earth-Surface Processes Remote sensing |
| Zdroj: | Annals of Glaciology. 56:353-362 |
| ISSN: | 1727-5644 0260-3055 |
| Popis: | We explore spatial aliasing of non-Gaussian distributions of sea-ice thickness. Using a heuristic model and >1000 measurements, we show how different instrument footprint sizes and shapes can cluster thickness distributions into artificial modes, thereby distorting frequency distribution, making it difficult to compare and communicate information across spatial scales. This problem has not been dealt with systematically in sea ice until now, largely because it appears to incur no significant change in integrated thickness which often serves as a volume proxy. Concomitantly, demands are increasing for thickness distribution as a resource for modeling, monitoring and forecasting air–sea fluxes and growing human infrastructure needs in a changing polar environment. New demands include the characterization of uncertainties both regionally and seasonally for spaceborne, airborne, in situ and underwater measurements. To serve these growing needs, we quantify the impact of spatial aliasing by computing resolution error (Er) over a range of horizontal scales (x) from 5 to 500 m. Results are summarized through a power law (Er= bxm) with distinct exponents (m) from 0.3 to 0.5 using example mathematical functions including Gaussian, inverse linear and running mean filters. Recommendations and visualizations are provided to encourage discussion, new data acquisitions, analysis methods and metadata formats. |
| Databáze: | OpenAIRE |
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