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| Titel |
Impact of meteorological anomalies in the 2003 summer on Gross Primary Productivity in East Asia |
| VerfasserIn |
N. Saigusa, K. Ichii, H. Murakami, R. Hirata, J. Asanuma, H. Den, S.-J. Han, R. Ide, S.-G. Li, T. Ohta, T. Sasai, S.-Q. Wang, G.-R. Yu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 2 ; Nr. 7, no. 2 (2010-02-15), S.641-655 |
| Datensatznummer |
250004493
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| Publikation (Nr.) |
 copernicus.org/bg-7-641-2010.pdf |
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| Zusammenfassung |
| Northern Eurasia experienced anomalous weather conditions in the 2003
summer. We examined how forest ecosystems responded to the meteorological
anomalies during the period using the dataset collected at flux monitoring
sites in Asia, including a boreal forest in Mongolia, temperate forests in
China and Japan, and a sub-tropical forest in China, as well as the dataset
from satellite remote sensing. From July to August 2003, an active rain band
stayed in the mid-latitude in East Asia for an unusually long period. Under
the influence of the rain band, the Gross Primary Production (GPP), of
temperate forests was 20–30% lower in the 2003 summer than in other
years due to significant reduction in the Photosynthetic Photon Flux Density
(PPFD). The GPP of a cool-temperate forest in the north of the rain band was
slightly enhanced by the higher PPFD; however, the GPP of a sub-tropical
forest located in the south of the rain band was reduced by drought stress
due to extremely hot and dry conditions. The correlation coefficients for
the year-to-year changes in the PPFD and GPP during mid-summer were
calculated, and the spatial distribution was examined. The spatial pattern
of the PPFD was calculated by satellite data, and that of the GPP was
estimated by a regression-type model, which was trained and tested by ground
observation data. The correlation was positive in the mid- and
high-latitudes since light was an essential factor of the summer GPP. On the
other hand, a negative correlation appeared in the lower latitudes,
suggesting that the water limitation was much more important than the PPFD
in the region. Our study illustrated that the integration of flux data from
wide areas by combining satellite remote sensing data can help us gain an
understanding of the ecosystem responses to large-scale meteorological
phenomena. |
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