Radiation and coral bleaching

Dunne, R. P.

doi:10.1038/368697a0

Cited by 134 publications

(207 citation statements)

References 4 publications

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“…Blain, Barnard & Chapman 2003) which is consistent with SED fitting of low and high‐ z systems (e.g. Dunne et al 2001). A higher value of β d will result in lower dust temperatures (Sajina et al 2006).…”

Section: Resultssupporting

confidence: 85%

HerMES: Herschel-SPIRE observations of Lyman break galaxies

Rigopoulou¹,

Magdis²,

Ivison³

et al. 2010

Monthly Notices of the Royal Astronomical Society: Letters

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International audienceWe present first results of a study of the submillimetre (submm) (rest-frame far-infrared) properties of z similar to 3 Lyman break galaxies (LBGs) and their lower redshift counterparts BX/BM galaxies, based on Herschel-SPIRE observations of the Northern field of the Great Observatories Origins Deep Survey (GOODS-N). We use stacking analysis to determine the properties of LBGs well below the current limit of the survey. Although LBGs are not detected individually, stacking the infrared luminous LBGs (those detected with Spitzer at 24 mu m) yields a statistically significant submm detection with mean flux \textless S-250 \textgreater = 5.9 +/- 1.4 mJy confirming the power of SPIRE in detecting UV-selected high-redshift galaxies at submm wavelengths. In comparison, the Spitzer 24 mu m detected BX/BM galaxies appear fainter with a stacked value of \textless S-250 \textgreater = 2.7 +/- 0.8 mJy. By fitting the spectral energy distributions (SEDs) we derive median infrared luminosities, L-IR, of 2.8 x 10(12) L-circle dot and 1.5 x 10(11) L-circle dot for z similar to 3 LBGs and BX/BMs, respectively. We find that L-IR estimates derived from present measurements are in good agreement with those based on UV data for z similar to 2 BX/BM galaxies, unlike the case for z similar to 3 infrared luminous LBGs where the UV underestimates the true L-IR. Although sample selection effects may influence this result we suggest that differences in physical properties (such as morphologies, dust distribution and extent of star-forming regions) between z similar to 3 LBGs and z similar to 2 BX/BMs may also play a significant role

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Section: Resultssupporting

confidence: 85%

HerMES: Herschel-SPIRE observations of Lyman break galaxies

Rigopoulou¹,

Magdis²,

Ivison³

et al. 2010

Monthly Notices of the Royal Astronomical Society: Letters

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“…Siringo et al 2009), was used to determine the values used in the data reduction. Following Dunne & Eales (2001), the fractional error in the flux from the error due to the range of opacities calculated with these two methods is 6 per cent.…”

Section: O B S E Rvat I O N S a N D Data R E D U C T I O Nmentioning

confidence: 99%

Submillimetre variability of Eta Carinae: cool dust within the outer ejecta

Gomez

Vlahakis

Stretch

et al. 2010

Monthly Notices of the Royal Astronomical Society: Letters

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Previous submillimetre (submm) observations detected 0.7 M⊙ of cool dust emission around the luminous blue variable (LBV) star η Carinae. These observations were hindered by the low declination of η Carinae and contamination from free–free emission originating from the stellar wind. Here, we present deep submm observations with LABOCA at 870 μm, taken shortly after a maximum in the 5.5‐year radio cycle. We find a significant difference in the submm flux measured here compared with the previous measurement: the first indication of variability at submm wavelengths. A comparison of the submm structures with ionized emission features suggests the 870 μm is dominated by emission from the ionized wind and not thermal emission from dust. We estimate of dust surrounding η Carinae. The spatial distribution of the submm emission limits the mass loss to within the last thousand years, and is associated with mass ejected during the great eruptions and the pre‐outburst LBV wind phase; we estimate that η Carinae has ejected >40 M⊙ of gas within this time‐scale.

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“…Their ability to withstand such variations suggests that shallow water corals can protect themselves very effectively either through behavioural mechanisms (e.g polyp retraction) or biochernical/physiological adaptations (e.g, protective pigments) (see Brown 1996 for review). Indeed it seems that in intertidal corals high PAR irradiance (possibly in addition to UVR), rather than UVB, is responsible for inducing specific damage such as solar bleaching in corals (Brown et al 1994. Dunne 1994.…”

Section: Biological Damage Potentialmentioning

confidence: 99%

Penetration of solar UVB radiation in shallow tropical waters and its potential biological effects on coral reefs; results from the central Indian Ocean and Andaman Sea

Rp¹,

Be²

1996

Mar. Ecol. Prog. Ser.

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ABSTRACT. This paper presents the first complete data of global downwelling irradiance (Ed) and the diffuse attenuation coefficient (K,,) for solar ultraviolet-B (UVB; 280 to 320 nm) in tropical waters. The penetration of solar UVB into shallow (0 to 5 m) seawater a t 3 sites in the central Indian Ocean and Andaman Sea, adjacent to areas of coral reefs. 1 t . d~ studied using a semi-submersible scanning spectroradiometer. Downwelling global spectral irradiance (E,) w~i s measured at 2 nm intervals over the wavebands 280-320 nm (UVB), 320-400 nm (U\-:\) and 400-700 n m (PAR) above the sea surface (O* m) and at each of 5 depths (1, 2, 3. 4, and 5 m). The 3 sltes consisted of a n ocean atoll in the Maldives (central Indian Ocean), a small (8 km') high island 11 km off the continental coastline at Phuket, Thailand (Andaman Sea), and a n inshore reef at Phuket. E, at each of the depths was integrated over the wavebands as a percentage of the above-watcr irradiance. E,(UVB) at 5 m depth was found to decrease to 12"& of incident ~rradiancye at the mid-occan atoll, to 2 % for the high island site, and to 0.4 %) in the turbid waters of the inshore reef. A 1 'X, Ed(UVB) depth was computed for each site and found to be 11, 6, and 3 m respectively. The diffuse attenuation for downwelling irradiance (Kd) for the depth range 0-m (just below the surface) to 5 m showed a very rapid attenuation with decreasing ~vavelength in the UVB at all sites. Biological damage potential, as weighted by the DNA-damage action spectrum, showed a more rapid attenuation with depth than Ed(UVB), w~t h a 1 % EDN, depth of 9 m for the ocean atoll, 4.7 m for the coastal island, and 2.6 m for the inshore reef.

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Radiation and coral bleaching

Cited by 134 publications

References 4 publications

HerMES: Herschel-SPIRE observations of Lyman break galaxies

HerMES: Herschel-SPIRE observations of Lyman break galaxies

Submillimetre variability of Eta Carinae: cool dust within the outer ejecta

Penetration of solar UVB radiation in shallow tropical waters and its potential biological effects on coral reefs; results from the central Indian Ocean and Andaman Sea

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