Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1007/s00477-012-0658-x
Volltext Shareable Link
Titel (primär) Phase difference analysis of temperature and vegetation phenology for beech forest: a wavelet approach
Autor Carl, G.; Doktor, D.; Koslowsky, D.; Kühn, I. ORCID logo
Journal / Serie Stochastic Environmental Research and Risk Assessment
Erscheinungsjahr 2013
Department CLE; BZF
Band/Volume 27
Heft 5
Seite von 1221
Seite bis 1230
Sprache englisch
Keywords Beech forest; Bivariate time series analysis; Coherence phase; Morlet wavelet;Normalized difference vegetation index;Remote sensing signal
UFZ Querschnittsthemen RU1;
Abstract Temporal shifts in phenology or vegetation period of plants are seen as indicators of global warming with potentially severe impacts on ecosystem functioning. In spite of increasing knowledge on drivers, it is of utmost importance to disentangle the relationship between air temperatures, phenological events, potential temporal lags (phase shifts) and time scale for certain plant species. Assessing the phase shifts as well as the scale-dependent relationship between temperature and vegetation phenology requires the development of a nonlinear temporal model. Therefore, we use wavelet analysis and present a framework for identifying scale-dependent cross-phase coupling of bivariate time series. It allows the calculation of (a) scale-dependent decompositions of time series, (b) phase shifts of seasonal components in relation to the annual cycle, and (c) inter-annual phase differences between seasonal phases of different time series. The model is applied to air temperature data and remote sensing phenology data of a beech forest in Germany. Our study reveals that certain seasonal changes in amplitude and phase with respect to the normal annual rhythm of temperature and beech phenology are coupled time-delayed components, which are characterized by a time shift of about one year.

dauerhafte UFZ-Verlinkung
Carl, G., Doktor, D., Koslowsky, D., Kühn, I. (2013):
Phase difference analysis of temperature and vegetation phenology for beech forest: a wavelet approach
Stoch. Environ. Res. Risk Assess. 27 (5), 1221 - 1230