On the secular change of spring onset at Stockholm

Details On the secular change of spring onset at Stockholm On the secular change of spring onset at Stockholm

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3612706q&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 12, CiteID L12706

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Computation

7

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Global Change: Impacts Of Global Change (1225), Mathematical Geophysics: Time Series Analysis (1872, 4277, 4475), General Or Miscellaneous: Techniques Applicable In Three Or More Fields, Computational Geophysics: Data Analysis: Algorithms And Implementation

Scientific paper

A newly developed method, the Ensemble Empirical Mode Decomposition, was applied to adaptively determine the timing of climatic spring onset from the daily temperature records at Stockholm during 1756-2000. Secular variations of spring onset and its relationships to the North Atlantic Oscillation (NAO) and to the temperature variability were analyzed. A clear turning point of secular trend in spring onset around 1884/1885, from delaying to advancing, was found. The delaying trend of spring onset (6.9 days/century) during 1757-1884 and the advancing one (-7 days/century) during 1885-1999 were both significant. The winter NAO indices were found to be correlated with the spring onset at Stockholm at an inter-annual timescale only for some decades, but unable to explain the change of the long-term trends. The secular change from cooling to warming around the 1880s, especially in terms of spring temperature, might have led to the secular change of spring onset.

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