European light dosimeter network (ELDONET): 1998 data

Häder, Donat P.; Lebert, Michael; Colombetti, Giuliano; Figueroa, Félix L.

doi:10.1007/s101520000059

Cited by 14 publications

(8 citation statements)

References 32 publications

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“…The irradiance of PAR, UVB and UVA during both sampling periods was very high, in accordance with the latitude, altitude (3050 m) and low dissolved organic matter content in the lake (Reche et al 2001;Carrillo et al 2002Carrillo et al , 2008. The UVB/UVA and (UVA+UVB)/PAR ratios at 14:00 h local time (12:00 GMT) were higher than at sea level (Häder et al 2001;Aguilera et al 2004). The diffuse attenuation coefficients of the downward PAR and the three UV wavebands (305, 320 and 380 nm), both in July 2006 and August 2007, were higher than those previously reported in La Caldera lake in September 1998 (Carrillo et al 2002) and in other high mountain lakes (Morris et al 1995;Williamson et al 1996;Sommaruga & Psenner 1997).…”

Section: Discussionsupporting

confidence: 56%

The effects of UV radiation on photosynthesis estimated as chlorophyll fluorescence in Zygnemopsis decussata (Chlorophyta) growing in a high mountain lake (Sierra Nevada, Southern Spain)

Figueroa¹,

Korbee²,

Carrillo³

et al. 2009

J Limnol

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The effect of increased UV radiation on photosynthesis estimated as in vivo chlorophyll fluorescence i.e. optimal quantum yield (Fv/Fm) and electron transport rate (ETR) in the green filamentous alga Zygnemopsis decussata (Streptophyta, Zygnematales) growing in the high mountain lake "La Caldera" (Sierra Nevada, Spain) at 3050 m altitude was evaluated. Two sets of in situ experiments were conducted: (1) On July 2006, Fv/Fm was measured throughout the day at different depths (0.1, 0.25, 0.5 and 1 m) and in the afternoon, ETR and phenolic compounds were determined. In addition, in order to analyze the effect of UV radiation, Fv/Fm was determined in algae incubated for 3 days at 0.5m under three different light treatments: PAR+UVA+UVB (PAB), PAR+UVA (PA) and PAR (P). (2) On August 2007, Fv/Fm was determined under PAB, PA and P treatments and desiccation/rehydration conditions. Fv/Fm decreased in algae growing in surface waters (0.1 m) but also at 1 m depth compared to that at 0.5 m depth. The decrease of Fv/Fm at noon due to photoinhibition was small (less than 10%) except in algae growing at 1 m depth (44%). The maximal electron transport rate was 3.5-5 times higher in algae growing at 0.25-0.5 m respectively than that at 0.1 and 1 m depth. These results are related to the accumulation of phenolic compounds: i.e. the algae at 0.25-0.5 m presented respectively about a 3-5 times higher concentration of phenolic compounds than that of algae at 0.1-1 m depth. The protection mechanisms seem to be stimulated by UVB radiation, since Fv/Fm was higher in the presence of UVB (PAB treatment) compared to PA or P treatments. UVA exerts the main photoinhibitory effect, not only at midday, but also in the afternoon. UVB radiation also had a protective effect in algae grown under desiccation conditions for three days. During re-hydration, the rapid increase of Fv/Fm (after 1 h) was higher in the UVB-grown algae than in algae grown under UVA radiation. After 5 h, Fv/Fm values were similar in algae submitted to desiccation/rehydration under PAB and P treatments as they were in the control (submerged algae). The combined effect of desiccation and UVA produced the greatest decrease of photosynthesis in Z. decussata. Thus UVB, in contrast to other species, may support the recovery process. Z. decussata can acclimate to severe stress conditions in this high mountain lake by the photoprotection mechanism induced by UVB radiation through dynamic photoinhibition and the accumulation of phenolic compounds (UV screen and antioxidant substances)

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Section: Discussionsupporting

confidence: 56%

The effects of UV radiation on photosynthesis estimated as chlorophyll fluorescence in Zygnemopsis decussata (Chlorophyta) growing in a high mountain lake (Sierra Nevada, Southern Spain)

Figueroa¹,

Korbee²,

Carrillo³

et al. 2009

J Limnol

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“…The instrument was calibrated in July 2005 for the response cosine, and for the absolute irradiance of three channels according to the protocols followed by the European ELDONET project as described in Häder et al (2001).…”

Section: The Estimation Methodsmentioning

confidence: 99%

Solar ultraviolet doses and vitamin D in a northern mid-latitude

Serrano

Cañada

Moreno

et al. 2017

Science of The Total Environment

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to 15% are similar in the defined interval measurements in relation to the whole UVA band.Regarding the PAR band, the model overestimates the direct normal irradiance of the PAR band by only 2.2%. With this, the results of the PAR band are more conclusive, as it has been found that for direct normal irradiance values higher than 280 W/m 2 the MBE error is almost zero and the other two estimator errors are small, about 5%.

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“…The European light dosimeter network (ELDONET) was originally designed within an EU project and initially involved about a dozen measurement sites along a latitudinal gradient within Europe from the polar circle (Abisko, North Sweden) to the subtropics (Canary Islands, Gran Canaria) (33–36). The instruments developed for this purpose are three‐channel dosimeters for UV‐B (280–315 nm), UV‐A (315–400 nm) and PAR (400–700 nm) in accordance with the definitions by CIE. Over the years the instruments have been technologically improved including an Ulbricht integrating sphere as optical entrance (37), microprocessor control for automatic monitoring and a mechanical shutter to determine the dark current of the UV‐B photodiode.…”

Section: Introductionmentioning

confidence: 99%

ELDONET—A Decade of Monitoring Solar Radiation on Five Continents

Häder

Lebert

Schuster

et al. 2007

Photochem & Photobiology

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The European light dosimeter network (ELDONET) comprises more than 40 stations in 24 countries on 5 continents. The present report compares solar radiation data in the photosynthetic active radiation, UV-A (315-400 nm) and UV-B (280-315 nm) wavelength ranges for 17 stations at different latitudes on the northern and southern hemispheres for up to 10 years of monitoring. While the maximal irradiances on clear days follow a latitudinal gradient due to the cosine dependence on the solar angle, the total doses strongly depend on the local climate and atmospheric conditions as well as the day-length distribution over the year. UV-B irradiances and doses are strongly influenced by the total column ozone, which is recorded for all covered stations.

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European light dosimeter network (ELDONET): 1998 data

Abstract: The European light dosimeter network of over 40 stations has been established in Europe and other continents equipped with three-channel filter dosimeters to measure solar radiation in three channels, UV-B

Cited by 14 publications

References 32 publications

The effects of UV radiation on photosynthesis estimated as chlorophyll fluorescence in Zygnemopsis decussata (Chlorophyta) growing in a high mountain lake (Sierra Nevada, Southern Spain)

The effects of UV radiation on photosynthesis estimated as chlorophyll fluorescence in Zygnemopsis decussata (Chlorophyta) growing in a high mountain lake (Sierra Nevada, Southern Spain)

Solar ultraviolet doses and vitamin D in a northern mid-latitude

ELDONET—A Decade of Monitoring Solar Radiation on Five Continents

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