| Title | Temporal trend analysis of synthetic and real hydroclimate time series and impacts of long term quasi-periodic components on trend tests |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Chen, Z ; Grasby,
S E |
| Source | Geological Survey of Canada, Open File 5691, 2009, 14 pages; 1 CD-ROM, https://doi.org/10.4095/247832  Open Access |
| Year | 2009 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | CD-ROM; on-line; digital |
| File format | pdf; txt |
| Subjects | hydrogeology; environmental geology; Nature and Environment; climatic fluctuations; climatology; climate; climate effects; environmental impacts; environmental studies; environmental analysis; models;
modelling; Climate change |
| Illustrations | graphs; plots; tables |
| Program | Climate Change Geoscience |
| Released | 2009 09 01 |
| Abstract | Studies of climate and hydro-meteorological time series have found the presence of decadal and inter-decadal oscillations of quasi-periodic components (broader band signals) as part of long term natural
variations in the data. If the oscillation of the quasi-periodic component is prominent, the impacts on the Mann-Kendall (M-K) and Thiel-Sen (T-S) trend tests could lead to a biased estimate and affect the prediction of future trends. This study
performed the Thiel-Sen test on simulated time series of periodic components with and without trends as well as real time series of climate and river discharge data with long records in the Canadian Prairies. The results of tests suggest that the
T-S test is sensitive to the presence of oscillation of long term quasi-periodic components. Data record length, magnitude of cyclic components and phase are the three most important factors affecting the M-K type of tests. The conclusion derived
for the T-S test in this study can also be applied to the M-K test. |
| GEOSCAN ID | 247832 |
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