Wavelet-based spatiotemporal analyses of climate and vegetation for the Athabasca river basin in Canada

Hatef Dastour, Ebrahim Ghaderpour, Mohamed Sherif Zaghloul, Babak Farjad, Anil Gupta, Hyung Eum, Gopal Achari, Quazi K. Hassan

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Monitoring spatiotemporal changes in climate and vegetation coverage are crucial for various purposes, including water, hazard, and agricultural management. Climate has an impact on vegetation, however, studying their relationship is challenging. We implemented the Least-Squares Wavelet (LSWAVE) software for investigating trend, coherency, and time lag estimation between climate and vegetation time series. We utilized Normalized Difference Vegetation Index (NDVI) time series provided by the Terra satellite and hybrid climate time series. We found that the seasonal cycles of climate and NDVI are coherent with time delay. For the entire Athabasca River Basin (ARB), the most coherent component was the annual cycle with 84% annual coherency between vegetation and temperature and 46% between vegetation and precipitation. The annual cycles of temperature and precipitation led the ones in vegetation by about two and three weeks, respectively. Relatively lower coherency was observed in the mountainous region (upper ARB) and higher coherency in the middle ARB. From the cross-spectrograms, a clear time delay pattern was observed between the annual cycles of climate and vegetation since 2000 but not for other high-frequency seasonal cycles. The results also highlighted the advantages of LSWAVE algorithms over traditional algorithms, such as linear regression and correlation. Furthermore, we analyzed the annual land use and land cover data provided by the Terra and Aqua satellites and discussed their linkage with the climate and NDVI results.

Original languageEnglish
Article number103044
JournalInternational Journal of Applied Earth Observation and Geoinformation
Volume114
DOIs
Publication statusPublished - Nov 2022
Externally publishedYes

Keywords

  • Coherency analysis
  • Land Use/Land Cover
  • MODIS
  • NDVI
  • Phase discrepancy
  • Spectral analysis
  • Trend analysis

ASJC Scopus subject areas

  • Global and Planetary Change
  • Earth-Surface Processes
  • Computers in Earth Sciences
  • Management, Monitoring, Policy and Law

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