Phenological characteristics of global ecosystems based on optical, fluorescence, and microwave remote sensing

Matthew Dannenberg, Xian Wang, Dong Yan, William Smith

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Growing seasons of vegetation generally start earlier and last longer due to anthropogenic warming. To facilitate the detection and monitoring of these phenological changes, we developed a discrete, hierarchical set of global "phenoregions" using self-organizing maps and three satellite-based vegetation indices representing multiple aspects of vegetation structure and function, including the normalized difference vegetation index (NDVI), solar-induced chlorophyll fluorescence (SIF), and vegetation optical depth (VOD). Here, wedescribe the distribution and phenological characteristics of these phenoregions, including their mean temperature and precipitation, differences among the three satellite indices, the number of annual growth cycles within each phenoregion and index, and recent changes in the land area of each phenoregion. We found that the phenoregions "self-organized" along two primary dimensions: degree of seasonality and peak productivity. The three satellite-based indices each appeared to provide unique information on land surface phenology, with SIF and VOD improving the ability to detect distinct annual and subannual growth cycles in some regions. Over the nine-year study period (limited in length by the short satellite SIF record), there was generally a decrease in the spatial extent of the highest productivity phenoregions, though whether due to climate or land use change remains unclear.

Original languageEnglish (US)
Article number671
JournalRemote Sensing
Volume12
Issue number4
DOIs
StatePublished - Feb 1 2020

Keywords

  • Classification
  • Normalized difference vegetation index (NDVI)
  • Phenoregions
  • Self-organizing maps (SOM)
  • Solar-induced fluorescence (SIF)
  • Time series analysis
  • Vegetation optical depth (VOD)

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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