Huang et al. (2024) Cumulative and Lagged Effects: Seasonal Characteristics of Drought Effects on East Asian Grasslands

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Identification

• Journal: Remote Sensing
• Year: 2024
• Date: 2024-09-19
• Authors: Weiwei Huang, Mark Henderson, Binhui Liu, Yuanhang Su, Wanying Zhou, Rong Ma, Mingyang Chen, Zhi Zhang
• DOI: 10.3390/rs16183478

Research Groups

Not specified

Short Summary

This study investigates the seasonal cumulative and lagged effects (CALEs) of drought on grassland growth in East Asia from 2001 to 2020, revealing that drought sensitivity and the dominance of lagged versus cumulative effects vary significantly by season.

Objective

• To explore the seasonal characteristics of the cumulative and lagged effects (CALEs) of drought on grassland growth in East Asia.

Study Configuration

• Spatial Scale: Grasslands of East Asia.
• Temporal Scale: 2001–2020.

Methodology and Data

• Models used: Not explicitly mentioned (statistical analysis of vegetation and drought indices).
• Data sources: Normalized Difference Vegetation Index (NDVI) and Standardized Precipitation Evapotranspiration Index (SPEI).

Main Results

• Over 40% of the studied grasslands are significantly affected by the CALEs of drought across spring, summer, and autumn.
• Summer is the season where grasslands exhibit the highest sensitivity to the CALEs of drought.
• The dominant drought effect is season-dependent: the lagged effect (LE) predominates in spring and autumn, whereas the cumulative effect (CE) dominates in summer.
• During the growing season, the LE exceeds the CE across 54.89% of the study area.
• Response patterns vary by intensity: as drought intensifies, the cumulative time scale increases in spring and autumn but decreases in summer.
• Spatial variability of the cumulative time scale is highest in spring, while the lagged time scale variability peaks in summer.

Contributions

• The research demonstrates that traditional annual or growing-season scale analyses obscure critical seasonal response characteristics, highlighting the necessity of seasonal resolution to accurately predict grassland ecosystem changes under global warming.

Funding

Not specified

Citation

@article{Huang2024Cumulative,
  author = {Huang, Weiwei and Henderson, Mark and Liu, Binhui and Su, Yuanhang and Zhou, Wanying and Ma, Rong and Chen, Mingyang and Zhang, Zhi},
  title = {Cumulative and Lagged Effects: Seasonal Characteristics of Drought Effects on East Asian Grasslands},
  journal = {Remote Sensing},
  year = {2024},
  doi = {10.3390/rs16183478},
  url = {https://doi.org/10.3390/rs16183478}
}