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Author |
Chapelle, G; Peck, LS |
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Title |
Polar gigantism dictated by oxygen availability |
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Journal Article |
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Year |
1999 |
Publication |
Nature |
Abbreviated Journal |
Nature |
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Volume |
399 |
Issue |
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Pages |
114-115 |
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English |
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ISSN |
0028-0836 |
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Black Sea; Caspian Sea; Lake Baikal |
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no |
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Call Number |
refbase @ user @ 137 |
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1 |
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Author |
Gerland, S; Winther, J-G; Örbæk, JB; Ivanov, BV |
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Title |
Physical properties, spectral reflectance and thickness development of first year fast ice in Kongsfjorden, Svalbard |
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Book Chapter |
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Year |
1999 |
Publication |
Proceedings of the International Symposium on Polar Aspects of Global Change |
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275-282 |
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Keywords |
Fast ice; Ice properties; Reflectance; Ice thickness; Physical properties; PNE, Norway, Svalbard, Kongsfjorden |
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Abstract |
A ground truth study was performed on first year fast ice in Kongsfjorden, Svalbard, during spring 1997 and 1998. The survey included sea ice thickness monitoring as well as observation of surface albedo, attenuation of optical radiation in the ice, physical properties and texture of snow and sea ice. The average total sea ice thickness in May was about 0.9 m, including a 0.2 m thick snow layer on top. Within a few weeks in both years, the snow melted almost completely, whereas the ice thickness decreased by not more than 0.05 m. During spring, the lower part of the snow refroze into a solid layer. The sea ice became more porous. Temperatures in the sea ice increased and the measurable salinity of the sea ice decreased with time. Due to snow cover thinning and snow grain growth, maximum surface albedo decreased from 0.96 to 0.74. Texture analysis on cores showed columnar ice with large crystals (max. crystal length > 0.1 m) below a 0.11 m thick mixed surface layer of granular ice with smaller crystals. In both years, we observed sea ice algae at the bottom part of the ice. This layer has a significant effect on the radiation transmissivity. |
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Norwegian Polar Institute, Polar Environmental Centre, N-9296 Tromsoe, Norway |
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Norsk Polarinstitutt |
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English |
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English |
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Polar Research |
Abbreviated Series Title |
Polar Res |
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Series Volume |
18 |
Series Issue |
2 |
Edition |
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ISSN |
0800-0395 |
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International Symposium on Polar Aspects of Global Change, Tromso (Norway), 24-28 Aug 1998 |
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Conference |
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no |
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Call Number |
refbase @ user @ 726 |
Serial |
6 |
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Author |
Lohrmann, A; Cabrera, R; Kraus, NC |
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Title |
Acoustic-doppler velocimeter (ADV) for laboratory use |
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Journal Article |
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Year |
1994 |
Publication |
Fundamentals and advancements in hydraulic measurements and experimentation. Proceedings, Hydraulic Division/ASCE, August 1994 |
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Pages |
351-365 |
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Keywords |
methods; flow; flume |
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Symposium on fundamentals and advancements in hydraulic measurements and experimentation |
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no |
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Call Number |
refbase @ user @ |
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8 |
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Author |
Schleser, GH; Jayasekera, R |
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Title |
δ13C-variations of leaves in forests as an indication of reassimilated CO2 from the soil |
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Journal Article |
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Year |
1985 |
Publication |
Oecologia |
Abbreviated Journal |
Oecologia |
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Volume |
65 |
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Pages |
536-542 |
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Keywords |
soil respiration; photosynthesis; vascular plant |
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no |
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Call Number |
refbase @ user @ ms |
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11 |
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Author |
Bischof, K; Peralta, G; Kräbs, G; van de Poll, WH; Perez-Llorens, JL; Breeman, AM |
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Title |
Effects of solar UV-B radiation on canopy structure of Ulva communities from southern Spain |
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Journal Article |
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Year |
2002 |
Publication |
Journal of Experimental Botany |
Abbreviated Journal |
J Exp Bot |
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Volume |
53 |
Issue |
379 |
Pages |
2411-2421 |
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Keywords |
canopy formation; photosynthesis; ultraviolet radiation; Ulva rotundata |
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Abstract |
Within the sheltered creeks of Cádiz bay, Ulva thalli form extended mat-like canopies. The effect of solar ultraviolet radiation on photosynthetic activity, the composition of photosynthetic and xanthophyll cycle pigments, and the amount of RubisCO, chaperonin 60 (CPN 60), and the induction of DNA damage in Ulva aff. rotundata Bliding from southern Spain was assessed in the field. Samples collected from the natural community were covered by screening filters, generating different radiation conditions. During daily cycles, individual thalli showed photoinhibitory effects of the natural solar radiation. This inhibition was ev
en more pronounced in samples only exposed to photosynthetically active radiation (PAR). Strongly increased heat dissipation in these samples indicated the activity of regulatory mechanisms involved in dynamic photoinhibition. Adverse effects of UV-B radiation on photosynthesis were only observed in combination with high levels of PAR, indicating the synergistic effects of the two wavelength ranges. In samples exposed either to PAR+UV-A or to UV-B+UV-A without PAR, no inhibition of photosynthetic quantum yield was found in the course of the day. At the natural site, the top layer of the mat-like canopies is generally completely bleached. Artificially designed Ulva canopies exhibited fast bleaching of the top layer under the natural solar radiation conditions, while this was not observed in canopies either shielded from UV or from PAR. The bleached first layer of the canopies acts as a selective UV-B filter, and thus prevents subcanopy thalli from exposure to harmful radiation. This was confirmed by the diff
erences in photosynthetic activity, pigment composition, and the concentration of RubisCO in thalli with different positions within the canopy. In addition, the induction of the stress protein CPN 60 under UV exposure and the low accumulation of DNA damage indicate the presence of physiological protection mechanisms against harmful UV-B. A mechanism of UV-B-induced inhibition of photosynthesis under field conditions is proposed. |
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Publisher |
Oxford University Press |
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English |
Summary Language |
English |
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southern Spain |
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Call Number |
refbase @ user @ |
Serial |
12 |
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