Hexbyte Glen Cove Volcanic ash cloud closes La Palma airport; new vent emerges thumbnail

Hexbyte Glen Cove Volcanic ash cloud closes La Palma airport; new vent emerges

Hexbyte Glen Cove

Two people walk as lava spews from a volcano on the Canary island of La Palma, Spain in the early hours of Saturday Sept. 25, 2021. A volcano in Spain’s Canary Islands is keeping nerves on edge several days since it erupted, producing loud explosions, a huge ash cloud and cracking open a new fissure that spewed out more fiery molten rock. The prompt evacuations are credited with helping avoid casualties but scientists say the lava flows could last for weeks or months. Credit: AP Photo/Daniel Roca

The airport on the Spanish island of La Palma shut down Saturday because of an ash cloud spewing out of a volcano that has been erupting for a week, and scientists said another volcanic vent opened up, exposing islanders to possible new dangers.

The intensity of the eruption that began Sept. 19 has increased in recent days, prompting the evacuation of three additional villages on the island, part of Spain’s Canary Islands archipelago in the Atlantic Ocean off northwest Africa. Almost 7,000 people have been forced to abandon their homes.

The recent volcanic eruption is the first since 1971 on La Palma, which has a population of 85,000.

La Palma Airport operator Aena said the was “inoperative” due to the accumulation of ash. Other airports in the Canary Islands were still operating Saturday but some airlines were suspending flights, Aena said.

Emergency crews pulled back from the volcano Friday as explosions sent molten rock and ash over a wide area. The Canary Islands Volcanology Institute said another vent opened early Saturday.

Rivers of lava have been sliding down the mountainside toward the southwestern coast of the island, destroying everything in their path, including hundreds of homes. The speed of the flow has slowed down considerably, however, and the lava is now barely moving forward, with about 2 kilometers left to reach the sea, said Miguel Ángel Morcuende, head of the Canary Island Volcanic Emergency Plan.

  • Vehicles are covered by ashes from a volcano eruption at the island of La Palma in the Canaries, Spain, Friday, Sept. 24, 2021. A volcano on a small Spanish island in the Atlantic Ocean erupted on Sunday, forcing the evacuation of thousands of people. Experts say the volcanic eruption and its aftermath on a Spanish island could last for up to 84 days. Credit: AP Photo/Emilio Morenatti
  • Lava spews from a volcano on the Canary island of La Palma, Spain in the early hours of Saturday Sept. 25, 2021. A volcano in Spain’s Canary Islands is keeping nerves on edge several days since it erupted, producing loud explosions, a huge ash cloud and cracking open a new fissure that spewed out more fiery molten rock. The prompt evacuations are credited with helping avoid casualties but scientists say the lava flows could last for weeks or months. Credit: AP Photo/Daniel Roca
  • Lava flows in an eruption on the island of La Palma in the Canaries, Spain, Thursday, Sept. 23, 2021. A volcano on the small Spanish island in the Atlantic Ocean erupted on Sunday, forcing the evacuation of thousands of people. Experts say the eruption and its aftermath could last for up to 84 days. Credit: AP Photo/Emilio Morenatti
  • Residents look from a hill as lava continues to flow from an erupted volcano, on the island of La Palma in the Canaries, Spain, Friday, Sept. 24, 2021. A volcano in Spain’s Canary Islands continues to produce explosions and spew out lava, five days after it erupted. Two rivers of lava continue to slide slowly down the hillside of La Palma on Friday. Credit: AP Photo/Emilio Morenatti
  • Lava spews from a volcano on the Canary island of La Palma, Spain in the early hours of Saturday Sept. 25, 2021. A volcano in Spain’s Canary Islands is keeping nerves on edge several days since it erupted, producing loud explosions, a huge ash cloud and cracking open a new fissure that spewed out more fiery molten rock. The prompt evacuations are credited with helping avoid casualties but scientists say the lava flows could last for weeks or months. Credit: AP Photo/Daniel Roca
  • Lava from a volcano eruption flows on the island of La Palma in the Canaries, Spain, Thursday, Sept. 23, 2021. A volcano on a small Spanish island in the Atlantic Ocean erupted on Sunday, forcing the evacuation of thousands of people. Experts say the volcanic eruption and its aftermath on a Spanish island could last for up to 84 days. Credit: AP Photo/Emilio Morenatti, Pool
  • Lava from a volcano eruption flows on the island of La Palma in the Canaries, Spain, Thursday, Sept. 23, 2021. A volcano on a small Spanish island in the Atlantic Ocean erupted on Sunday, forcing the evacuation of thousands of people. Experts say the volcanic eruption and its aftermath on a Spanish island could last for up to 84 days. Credit: AP Photo/Emilio Morenatti, Pool
  • Lava from a volcano eruption flows on the island of La Palma in the Canaries, Spain, Thursday, Sept. 23, 2021. A volcano on a small Spanish island in the Atlantic Ocean erupted on Sunday, forcing the evacuation of thousands of people. Experts say the volcanic eruption and its aftermath on a Spanish island could last for up to 84 days. Credit: AP Photo/Emilio Morenatti, Pool
  • Lava from a volcano eruption surrounds a house on the island of La Palma in the Canaries, Spain, Thursday, Sept. 23, 2021. A volcano on a small Spanish island in the Atlantic Ocean erupted on Sunday, forcing the evacuation of thousands of people. Experts say the volcanic eruption and its aftermath on a Spanish island could last for up to 84 days. Credit: AP Photo/Emilio Morenatti, Pool
  • Lava from a volcano eruption engulfs houses on the island of La Palma in the Canaries, Spain, Thursday, Sept. 23, 2021. A volcano on a small Spanish island in the Atlantic Ocean erupted on Sunday, forcing the evacuation of thousands of people. Experts say the volcanic eruption and its aftermath on a Spanish island could last for up to 84 days. Credit: AP Photo/Emilio Morenatti, Pool

“I don’t dare to tell you when it’s going to get there, nor do I dare to make a forecast,” Morcuende told reporters in a news conference.

A more immediate concern for the residents of La Palma is the huge that is rising from the volcano and being carried by the wind to other parts of the island. In addition to being a significant danger to aviation, he said volcanic ash can cause damage to people’s airways, lungs and eyes. The local government has urged residents in affected areas to avoid going outside and only do so wearing masks and goggles.



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Volcanic ash cloud closes La Palma airport; new vent emerges (2021, September 25)
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Hexbyte Glen Cove Effects of organohalogen pollution are coded in hepatic gene expression profiles of Baltic salmon thumbnail

Hexbyte Glen Cove Effects of organohalogen pollution are coded in hepatic gene expression profiles of Baltic salmon

Hexbyte Glen Cove

Hepatic transcriptomes in salmon are affected by OHC contamination. Credit: Environmental Science & Technology, American Chemical Society

Researchers of Ehime University and the University of Helsinki measured hepatic organohalogen (OHC) concentrations and gene expression profiles in Atlantic salmon collected from three areas in the Baltic Sea. The results showed that OHCs and gene expression profiles were individually grouped in three areas and the covariation of the two datasets provided by a multivariate method was significantly similar. This suggests that the gene expression profiles in salmon are affected by OHC contamination.

Hatchery-reared Atlantic salmon (Salmo salar) have been released to support the wild salmon stocks in the Baltic Sea for decades. During their feeding migration, salmon are exposed to organohalogen compounds (OHCs). Here, we investigated the OHC levels and transcriptome profiles in the liver of wild and hatchery-reared salmon collected from the Baltic main basin, the Bothnian Sea, and the Gulf of Finland and examined whether salmon origin and OHC levels contributed to the hepatic transcriptome profiles. There were no differences in the OHC concentrations and transcriptome profiles between wild and hatchery-reared fish but there were large differences among the areas. Several transcript levels were associated with polychlorinated biphenyls, chlordanes, and dichlorodiphenyltrichloroethane in a concentration-dependent manner. When comparing the different areas, , , cell growth and death-related pathways were enriched in the liver transcriptome. Coinertia analysis, a multivariate method, showed that the covariation in the OHC levels and the transcriptome were significantly similar. These results suggest that the hepatic transcriptomes in wild and hatchery-reared salmon are more affected by the OHC level than the salmon’s origin.

This paper was published in Environmental Science and Technology on November 9, 2020.



More information:
Mirella Kanerva et al. Effects on the Liver Transcriptome in Baltic Salmon: Contributions of Contamination with Organohalogen Compounds and Origin of Salmon, Environmental Science & Technology (2020). DOI: 10.1021/acs.est.0c04763

Provided by
Ehime University

Citation:
Effects of organohalogen pollution are coded in hepatic gene expression profiles of Baltic salmon (2020, December 16)
retrieved 16 December 2020
from https://phys.org/news/2020-12-effects-organohalogen-pollution-coded-hepatic.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without th

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