 |
| Titel |
First observations of global and seasonal terrestrial chlorophyll fluorescence from space |
| VerfasserIn |
J. Joiner, Y. Yoshida, A. P. Vasilkov, Y. Yoshida, L. A. Corp, E. M. Middleton |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 3 ; Nr. 8, no. 3 (2011-03-08), S.637-651 |
| Datensatznummer |
250005567
|
| Publikation (Nr.) |
 copernicus.org/bg-8-637-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| Remote sensing of terrestrial vegetation fluorescence from space is of
interest because it can potentially provide global coverage of the
functional status of vegetation. For example, fluorescence
observations may provide a means to detect vegetation stress before
chlorophyll reductions take place. Although there have been many
measurements of fluorescence from ground- and airborne-based
instruments, there has been scant information available from
satellites. In this work, we use high-spectral resolution data from
the Thermal And Near-infrared Sensor for carbon Observation – Fourier
Transform Spectrometer (TANSO-FTS) on the Japanese Greenhouse gases
Observing SATellite (GOSAT) that is in a sun-synchronous orbit with an
equator crossing time near 13:00 LT. We use filling-in of the
potassium (K) I solar Fraunhofer line near 770 nm to derive
chlorophyll fluorescence and related parameters such as the
fluorescence yield at that wavelength. We map these parameters
globally for two months (July and December 2009) and show a full
seasonal cycle for several different locations, including two in the
Amazonia region. We also compare the derived fluorescence information
with that provided by the MODIS Enhanced Vegetation Index (EVI). These
comparisons show that for several areas these two indices exhibit
different seasonality and/or relative intensity variations, and that
changes in fluorescence frequently lead those seen in the EVI for
those regions. The derived fluorescence therefore provides
information that is related to, but independent of the reflectance. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|