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Dye, D.G., 2012. Looking skyward to study ecosystem carbon dynamics. Eos, Transactions American Geophysical Union, Volume 93, Issue 14, pages 141-143, 3 April 2012.

Studies on Phenology — Carbon — Climate Relations

The sky distribution of photosynthetically active radiation measured by HDR-ASIS--an important new data source for estimating rates of photosynthesis and carbon uptake with state-of-the-art, 3-dimensional process models.
The sky distribution of photosynthetically active radiation measured by
HDR-ASIS--an important new data source for estimating rates of
photosynthesis and carbon uptake with state-of-the-art, 3-dimensional
process models.
The overarching goals of the LCS project for Studies on Phenology-Carbon-Climate Relations are to improve knowledge and understanding of the response of seasonal vegetation growth patterns (phenology) to climate change and its effects on terrestrial carbon cycling through remote sensing-based observation, analysis and modeling. Major accomplishments to date include the development of two innovative, ground-based remote sensing systems for improved, quantitative monitoring and analysis of key biotic and abiotic factors that determine terrestrial photosynthesis and its temporal dynamics. The High Dynamic Range All-Sky Imaging System (HDR-ASIS) is providing new data and information on the role of atmospheric conditions in controlling the local 3-dimensional solar radiation regime. HDR-ASIS is used to quantify, and ultimately help reduce, radiation-related uncertainties in models of terrestrial carbon cycling and biological carbon sequestration. The High Dynamic Range (HDR) Phenocam acquires multispectral images of vegetation at canopy-to-landscape scales with greater fidelity than is typically achieved with standard cameras ("phenocams") used to monitor landscape phenology. Initial results suggest the HDR-Phenocam may provide improved accuracy in the characterization of landscape phenology and associated modeling of terrestrial carbon dynamics. The LCS Phenology-Carbon-Climate Relations project is conducted in coordination and partnership with projects sponsored by other federal research funding programs. Recent examples include the Department of Energy’s Atmospheric Radiation Measurement (ARM) Program ("Field Test of a High Dynamic Range All-Sky Imaging System", 2011) and NASA’s Terrestrial Ecology Program ("Scaling Photosynthesis in Tropical Systems: From Forest to Savanna, from Seasons to Extreme Events", 2011-2014).

Principal Investigator: Dennis Dye, ddye@usgs.gov, Western Geographic Science Center, Menlo Park, CA

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