| タイトル | The 2010 Russian Drought Impact on Satellite Measurements of Solar-Induced Chlorophyll Fluorescence: Insights from Modeling and Comparisons with the Normalized Differential Vegetation Index (NDVI) |
| 本文（外部サイト） | http://hdl.handle.net/2060/20160000352 |
| 著者（英） | Lee, J. -E.; Koster, R.; Berry, J.; Yoshida, Y.; Tucker, C.; Joiner, J.; Walker, G.; Lyapustin, A.; Wang, Y.; Reichle, R. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2015-06-24 |
| 言語 | eng |
| 内容記述 | We examine satellite-based measurements of chlorophyll solar-induced fluorescence (SIF) over the region impacted by the Russian drought and heat wave of 2010. Like the popular Normalized Difference Vegetation Index (NDVI) that has been used for decades to measure photosynthetic capacity, SIF measurements are sensitive to the fraction of absorbed photosynthetically-active radiation (fPAR). However, in addition, SIF is sensitive to the fluorescence yield that is related to the photosynthetic yield. Both SIF and NDVI from satellite data show drought-related declines early in the growing season in 2010 as compared to other years between 2007 and 2013 for areas dominated by crops and grasslands. This suggests an early manifestation of the dry conditions on fPAR. We also simulated SIF using a global land surface model driven by observation-based meteorological fields. The model provides a reasonable simulation of the drought and heat impacts on SIF in terms of the timing and spatial extents of anomalies, but there are some differences between modeled and observed SIF. The model may potentially be improved through data assimilation or parameter estimation using satellite observations of SIF (as well as NDVI). The model simulations also offer the opportunity to examine separately the different components of the SIF signal and relationships with Gross Primary Productivity (GPP). |
| NASA分類 | Geosciences (General) |
| レポートNO | GSFC-E-DAA-TN19995 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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