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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Middleton, E.M. Cheng, Y.-B. Hilker, T. Coops, N.C. Huemmrich, K.F. Black, T.A. Krishnan, P. |
| Copyright Year | 2008 |
| Description | Author affiliation: Fac. of Forest Resource Manage., Univ. of British Columbia, Vancouver, BC (Hilker, T.; Coops, N.C.) || Goddard Space Flight Center, Greenbelt, MD (Middleton, E.M.; Cheng, Y.-B.) || Fac. of Land & Food Syst., Univ. of British Columbia, Vancouver, BC (Black, T.A.) || Nat. Oceanic Atmos. Adm., Oak Ridge, TN (Krishnan, P.) || Joint Center for Earth Syst. Sci., Univ. of Maryland Baltimore County, Baltimore, MD (Huemmrich, K.F.) |
| Abstract | Hyperspectral reflectance data collected diurnally from an instrumented tower were examined in conjunction with the eddy correlation fluxes and meteorological measurements made throughout a growing season at a mature Douglas fir forest in British Columbia, Canada (DF49). Here we present 2006 in situ results relating the Photochemical Reflectance Index $(PRI_{551})$ to photosynthetic light use efficiency (LUE). Canopy structure information was used to partition the forest canopy into sunlit and shaded fractions. At each observation period, the $PRI_{551}$ was examined for the sunlit, shaded, and mixed sunlit/shaded canopy segments as defined by their instantaneous position relative to the solar principal plane (SPP). We show that the $PRI_{551}$ clearly captures the differences in leaf groups on sunny days. We also examined $PRI_{551}$ from MODIS ocean band imagery acquired over DF49 during a five year period (2001-2006) from both Terra (late morning) and Aqua (early afternoon) platforms. The MODIS observations from Terra and Aqua were acquired in different viewing planes above the landscape over a range of view zenith angles, and sampled the backscatter (sunlit) and forward scatter (shaded) sectors of the forest's bidirectional reflectance distribution function. When tower-based bulk canopy LUE from 2006 was recalculated to estimate foliage-based values for the three foliage groups under their incident light environments, a strong linear relationship with $PRI_{551}$ was demonstrated $(r^{2}~0.80).$ A similar relationship between the MODIS $PRI_{551}$ and tower-based bulk LUE was obtained from satellite observations $(r^{2}~0.62),$ but only for the backscatter observations obtained at high light levels (APAR, >1500 mumol $m^{-2}$ $s^{-1}).$ The MODIS observations, while not ideal in terms of spatial resolution (> 1 $km^{2})$ or optimal viewing configuration, nevertheless provided a means to monitor forest under stress using narrow spectral band indices and off-nadir observations. |
| File Size | 460114 |
| File Format | |
| ISBN | 9781424428076 |
| DOI | 10.1109/IGARSS.2008.4778989 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2008-07-07 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | MODIS Ecosystems Sea measurements Reflectivity Backscatter Hyperspectral imaging Instruments Poles and towers Meteorology Photochemistry MODIS Aqua and Terra Light use efficiency Douglas fir Photochemical Reflectance Index |
| Content Type | Text |
| Resource Type | Article |
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