Atmos. Chem. Phys. Discuss., 8, 1291-1320, 2008
www.atmos-chem-phys-discuss.net/8/1291/2008/
doi:10.5194/acpd-8-1291-2008
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Eclipse effects on field crops and marine zooplankton: the 29 March 2006 Total Solar Eclipse
G. Economou1, E. D. Christou2, A. Giannakourou2, E. Gerasopoulos3, D. Georgopoulos3, V. Kotoulas1, D. Lyra1, N. Tsakalis1, M. Tziortzou4, P. Vahamidis1, E. Papathanassiou2, and A. Karamanos1
1Laboratory of Agronomy, Faculty of Plant Production, Agricultural University of Athens, 75 Iera Odos Str., 11855 Athens, Greece
2Institute of Oceanography, Hellenic Center for Marine Research, Greece
3Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Greece
4NASA Goddard Space Flight Center – ESSIC/Univ. of Maryland Smithsonian Institution, SERC, USA

Abstract. The effects in the biosphere from the Total Solar Eclipse of 29 March 2006 were investigated in field crops and marine zooplankton. Taking into account the decisive role of light on the photoenergetic and photoregulatory plant processes, measurements of photosynthesis and stomatal behaviour were conducted on seven important field-grown cereal and leguminous crops. A drop in photosynthetic rates, by more than a factor of 5 in some cases, was observed, and the minimum values of photosynthetic rates ranged between 3.13 and 10.13 μmol CO2 m−2 s−1. However, since solar irradiance attenuation has not at the same time induced stomatal closure thus not blocking CO2 uptake by plants, it is probably other endogenous factors that has been responsible for the observed fall in photosynthetic rates. Field studies addressing the migratory responses of marine zooplankton (micro-zooplankton (ciliates), and meso-zooplankton) due to the rapid changes in underwater light intensity were also performed. The light intensity attenuation was simulated with the use of accurate underwater radiative transfer modeling techniques. Ciliates, responded to the rapid decrease in light intensity during the eclipse adopting night-time behaviour. From the meso-zooplankton assemblage, various vertical migratory behaviours were adopted by different species.

Citation: Economou, G., Christou, E. D., Giannakourou, A., Gerasopoulos, E., Georgopoulos, D., Kotoulas, V., Lyra, D., Tsakalis, N., Tziortzou, M., Vahamidis, P., Papathanassiou, E., and Karamanos, A.: Eclipse effects on field crops and marine zooplankton: the 29 March 2006 Total Solar Eclipse, Atmos. Chem. Phys. Discuss., 8, 1291-1320, doi:10.5194/acpd-8-1291-2008, 2008.
 
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