An enhancement to sea ice motion and age products at the National Snow and Ice Data Center (NSIDC)
| Autor: | Mark Tschudi, J. Scott Stewart, Walter N. Meier |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
National Snow and Ice Data Center
lcsh:GE1-350 geography Series (stratigraphy) geography.geographical_feature_category 010504 meteorology & atmospheric sciences lcsh:QE1-996.5 010502 geochemistry & geophysics 01 natural sciences Standard deviation The arctic lcsh:Geology Climatology Sea ice Ice age Environmental science lcsh:Environmental sciences 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology |
| Zdroj: | The Cryosphere, Vol 14, Pp 1519-1536 (2020) |
| ISSN: | 1994-0424 1994-0416 |
| Popis: | A new version of sea ice motion and age products includes several significant upgrades in processing, corrects known issues with the previous version, and updates the time series through 2018, with regular updates planned for the future. First, we provide a history of these NASA products distributed at the National Snow and Ice Data Center. Then we discuss the improvements to the algorithms, provide validation results for the new (Version 4) and older versions, and intercompare the two. While Version 4 algorithm changes were significant, the impact on the products is relatively minor, particularly for more recent years. The changes in Version 4 reduce motion biases by ∼ 0.01 to 0.02 cm s−1 and error standard deviations by ∼ 0.3 cm s−1. Overall, ice speed increased in Version 4 over Version 3 by 0.5 to 2.0 cm s−1 over most of the time series. Version 4 shows a higher positive trend for the Arctic of 0.21 cm s−1 per decade compared to 0.13 cm s−1 per decade for Version 3. The new version of ice age estimates indicates more older ice than Version 3, especially earlier in the record, but similar trends toward less multiyear ice. Changes in sea ice motion and age derived from the product show a significant shift in the Arctic ice cover, from a pack with a high concentration of older ice to a sea ice cover dominated by first-year ice, which is more susceptible to summer melt. We also observe an increase in the speed of the ice over the time series ≥ 30 years, which has been shown in other studies and is anticipated with the annual decrease in sea ice extent. |
| Databáze: | OpenAIRE |
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