Response of Subdaily L-Band Backscatter to Internal and Surface Canopy Water Dynamics
| Autor: | Paul C. Vermunt, Leila Guerriero, Pang-Wei Liu, Alejandro Monsivais-Huertero, Susan C. Steele-Dunne, Saeed Khabbazan, Jasmeet Judge |
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| Rok vydání: | 2021 |
| Předmět: |
Settore ING-INF/02
Synthetic aperture radar Backscatter 0211 other engineering and technologies dew 02 engineering and technology interception Atmospheric sciences law.invention sap flow vegetation law diurnal Electrical and Electronic Engineering Radar Water content 021101 geological & geomatics engineering Vegetation Scatterometer L-band corn General Earth and Planetary Sciences Environmental science ground-based Dew scatterometer subdaily radar Interception water content |
| Zdroj: | IEEE Transactions on Geoscience and Remote Sensing, 59(9) |
| ISSN: | 1558-0644 0196-2892 |
| Popis: | The latest developments in radar mission concepts suggest that subdaily synthetic aperture radar will become available in the next decades. The goal of this study was to demonstrate the potential value of subdaily spaceborne radar for monitoring vegetation water dynamics, which is essential to understand the role of vegetation in the climate system. In particular, we aimed to quantify fluctuations of internal and surface canopy water (SCW) and understand their effect on subdaily patterns of L-band backscatter. An intensive field campaign was conducted in north-central Florida, USA, in 2018. A truck-mounted polarimetric L-band scatterometer was used to scan a sweet corn field multiple times per day, from sowing to harvest. SCW (dew, interception), soil moisture, and plant and soil hydraulics were monitored every 15 min. In addition, regular destructive sampling was conducted to measure seasonal and diurnal variations of internal vegetation water content. The results showed that backscatter was sensitive to both transient rainfall interception events, and slower daily cycles of internal canopy water and dew. On late-season days without rainfall, maximum diurnal backscatter variations of >2 dB due to internal and SCW were observed in all polarizations. These results demonstrate a potentially valuable application for the next generation of spaceborne radar missions. |
| Databáze: | OpenAIRE |
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