Rawat, Shivam
- Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet
Sammanfattning
This study investigates the influence of diurnal variations in sap flux density and vapor pressure deficit (VPD) on L-band radar backscatter patterns, using BorealScat-2 data to focus on polarization and height-specific correlations for understanding forest water dynamics. Multi-polarization and height-resolved backscatter profiles from BorealScat-2 were analyzed alongside sap flux and VPD measurements. Temporal heatmaps highlighted distinct backscatter dynamics, with the mid-to-upper canopy (14 to 20 m) having influence on radar signals. Diurnal cycles of backscatter intensity correlated strongly with sap flux density under varying VPD conditions, demonstrating the radar's sensitivity to canopy water dynamics. Co-polarized backscatter (HH and VV) consistently exhibited stronger and more stable correlations with sap flux compared to cross-polarized signals. By integrating BorealScat-2 radar data with physiological and meteorological variables, this study underscores the potential of L-band radar backscatter as a proxy for transpiration and forest water exchange processes. The findings enhance understanding of the interplay between environmental factors and radar scattering mechanisms, contributing to advancements in radar-based monitoring of forest hydrology and evapotranspiration.
Nyckelord
L-band backscatter; tomographic radar analysis; forest water dynamics; vapor pressure deficit (VPD); sap flux density
Publicerad i
IEEE International Geoscience and Remote Sensing Symposium proceedings
2025, sidor: 9230-9233
Titel: 2025 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS)
Utgivare: IEEE
Konferens
2025 International Geoscience and Remote Sensing Symposium-IGARSS-Annual, AUG 03-08, 2025, Brisbane, AUSTRALIA
SLU författare
Gutierrez Lopez, Jose
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
Laudon, Hjalmar
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
Persson, Henrik
- Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet
- Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet
UKÄ forskningsämne
Jordobservationsteknik
Publikationens identifierare
- DOI: https://doi.org/10.1109/IGARSS55030.2025.11242862
- ISBN: 979-8-3315-0811-1
- eISBN: 979-8-3315-0810-4
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/146714