Trends and variability of cloud fraction cover in the Arctic, 1982–2009
| Autor: | Mauro Boccolari, Flavio Parmiggiani |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Atmospheric Science
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences 0208 environmental biotechnology Cloud fraction Empirical orthogonal functions 02 engineering and technology 01 natural sciences 020801 environmental engineering The arctic Arctic Climatology Archipelago Period (geology) Environmental science Satellite Winter season 0105 earth and related environmental sciences |
| Zdroj: | Theoretical and Applied Climatology. 132:739-749 |
| ISSN: | 1434-4483 0177-798X |
| DOI: | 10.1007/s00704-017-2125-6 |
| Popis: | Climatology, trends and variability of cloud fraction cover (CFC) data over the Arctic (north of 70°N), were analysed over the 1982–2009 period. Data, available from the Climate Monitoring Satellite Application Facility (CM SAF), are derived from satellite measurements by AVHRR. Climatological means confirm permanent high CFC values over the Atlantic sector during all the year and during summer over the eastern Arctic Ocean. Lower values are found in the rest of the analysed area especially over Greenland and the Canadian Archipelago, nearly continuously during all the months. These results are confirmed by CFC trends and variability. Statistically significant trends were found during all the months over the Greenland Sea, particularly during the winter season (negative, less than −5 % dec −1) and over the Beaufort Sea in spring (positive, more than +5 % dec −1). CFC variability, investigated by the Empirical Orthogonal Functions, shows a substantial “non-variability” in the Northern Atlantic Ocean. Statistically significant correlations between CFC principal components elements and both the Pacific Decadal Oscillation index and Pacific North America patterns are found. |
| Databáze: | OpenAIRE |
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