Diurnal Vegetation Moisture Cycle in the Amazon and Response to Water Stress
Name
Geophysical Research Letters - 2024 - Asgarimehr - Diurnal Vegetation Moisture Cycle in the Amazon and Response to Water.pdf
Description
Published version
Size
2.5 MB
Format
Adobe PDF
Checksum (MD5)
0981df13d09993333b29dbd3d2310a6b
Author(s)
Asgarimehr, Milad
Entekhabi, Dara
Camps, Adriano
Date Issued
October 8, 2024
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Asgarimehr, M., Entekhabi, D., & Camps, A. (2024). Diurnal vegetation moisture cycle in the Amazon and response to water stress. Geophysical Research Letters, 51, e2024GL111462.
Version
Final published version
Abstract
Water stress in the Amazon is exacerbated by rising temperatures and reduced moisture levels. However, understanding forest responses to increased aridity is hindered by limited in situ water potential observations in the Amazon. Remote sensing of water content has emerged as a promising metric. Vegetation Water Content (VWC) diurnal dynamics is hypothesized to reflect water stress responses. Conventional sensors' low sampling rates impede capturing and studying sub‐daily VWC dynamics. Leveraging Global Navigation Satellite System Reflectometry (GNSS‐R) with unprecedented sampling rates, this study reveals significant disparities in morning and evening VWCs in the Amazon, for example, by 1.1 and 1.0 kg/ during the wet and dry seasons of 2019. A strong correlation between VWC (the difference between evening and morning VWCs) and vapor pressure deficit is observed in Amazonian peatland. This highlights the potential of VWC from innovative remote sensing techniques in elucidating water stress dynamics in critical ecosystems.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
10.1029/2024gl111462
