Besides cumulative temperature and precipitation, the phase synchronization of temperature and precipitation also helps to regulate vegetation distribution and productivity across global lands. However, the phase synchronization has been rarely considered in previous studies related to climate and biogeography due to a lack of a robust and quantitative approach. In this study, we proposed a synchronization index of temperature and precipitation (SI-TaP) and then investigated its global spatial distribution, interannual fluctuation, and long-term trend derived from a global 60-year dataset of meteorological forcings. Further investigation was conducted to understand the relationship between SI-TaP and the annually summed Normalized Difference Vegetation Index (NDVI), which could be a proxy of terrestrial vegetation productivity. Results show differences in both spatial patterns and temporal variations between SI-TaP and air temperature and precipitation, but SI-TaP may help to explain the distribution and productivity of terrestrial vegetation. About 60% of regions where annually summed NDVI is greater than half of its maximum value overlap regions where SI-TaP is greater than half of its maximum value. By using SI-TaP to explain vegetation productivity along with temperature and precipitation, the maximum increase in the coefficient of determination is 0.66 across global lands. Results from this study suggest that the proposed SI-TaP index is helpful to better understand climate change and its relation to the biota.
|Number of pages||11|
|Journal||Geoscience Data Journal|
|State||Published - Nov 1 2019|
Bibliographical noteFunding Information:
This research was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA19040303), the National Key Research and Development Program of China (2017YFC0503805), National Natural Science Foundation of China (31570472), the 100 Talents Program of the Chinese Academy of Sciences, and the Science and Technology Service Network Initiative of the Chinese Academy of Sciences (KFJ‐EW‐STS‐054). Authors are particularly grateful to Prof. Qiuhong Tang and anonymous reviewers for their constructive comments, to Dr. Linlin Guo for her work on literature survey, and to Ms. Huixia Ren for her work on programming.
© 2019 The Authors. Geoscience Data Journal published by Royal Meteorological Society and John Wiley & Sons Ltd.
- phase synchronization
- synchronization index
- vegetation productivity
ASJC Scopus subject areas
- Earth and Planetary Sciences (all)