Spatial and Temporal Variations in Global Land Surface Phenology

Authored by: Jianjun Zhao , Xiaoyi Guo , Hongyan Zhang

Atmosphere and Climate

Print publication date:  June  2020
Online publication date:  May  2020

Print ISBN: 9781138339675
eBook ISBN: 9780429440984
Adobe ISBN:

10.1201/9780429440984-42

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Abstract

Vegetation phenology is a key biological indicator for monitoring terrestrial ecosystems and global changes. Satellite remote sensing technology, an important means for monitoring global land surface phenology (LSP), is of great significance for research on the spatial and temporal variations in global land surface phenology and for understanding global climate change. Based on third-generation Global Inventory Modeling and Mapping Studies (GIMMS3g) data, the start of the growing season (SOS) and the end of the growing season (EOS) are extracted at the global scale from 1982 to 2015 by using three reconstruction methods and two extraction methods to study the spatial and temporal variation regularities and trend characteristics at different scales. The results show that the LSP changes in global vegetation from 1982 to 2015 have obvious spatial differences, and their distribution pattern follows some regularity. The distributions of the SOS and EOS in the vegetation pixel frequency map for the Northern Hemisphere over the past 34 years have obvious peaks, while the distributions of the SOS and EOS in the Southern Hemisphere exhibit no notable peaks. The changes in the SOS and EOS along a defined latitude show a distinct opposite trend. At the pixel scale, significant SOS advancing trends are located mainly in some Asian and European regions, while the EOS dates in some regions throughout North America, Europe, and South America are noticeably delayed. At the continental scale, the SOS dates in some regions throughout Europe and Oceania are significantly advanced, while the EOS dates in some regions of Europe, South America, South America, and Africa are noticeably delayed. The variation trends of different land-cover types vary among different latitude zones. Generally, the SOS dates in the Northern Hemisphere are more advanced than those in the Southern Hemisphere. At low latitudes, the SOS dates in both the Northern Hemisphere and the Southern Hemisphere are not significantly advanced, and at some latitudes, they are even delayed.

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