Bienvenido al ::: SerTox :::!

     Menú
· Noticias
· Institucional
· Investigación
· Materiales Educativos
· Biblioteca multimedia
· Preguntas frecuentes
· Boletín
· Buscar
· Contáctenos
· Enlaces - Directorio
· Glosario
· Noticias x Mes
· Temas
· Top 15

EnglishSpanish

     Buscar


     Categorías
· Todas las Categorías
· Aportes
· Ejercicios
· Informan / Escriben
· La prensa
· Noticias del Sertox
· Recomendamos
· Toxicología al día
· Trivia toxicológica
· zNo sólo de tóxicos

     Blogs



     Manifiesto amianto





 Toxicología al día: Tirpitz engagement recorded in Norwegian trees

Ver Imagen

El acorazado Tirpitz en Ofotfjord, Noruega (Foto: WP)

Nazi legacy found in Norwegian trees. By Jonathan Amos. bbcnews. April 11, 2018. The relentless campaign to find and sink Germany's WWII battleship, the Tirpitz, left its mark on the landscape that is evident even today. The largest vessel in Hitler's Kriegsmarine, it was stationed for much of the war along the Norwegian coast to deter an Allied invasion. The German navy would hide the ship in fjords and screen it with chemical fog.



Tree rings
Some had a ring but you would hardly see it
This "smoke" did enormous damage to the surrounding trees which is recorded in their growth rings.

Claudia Hartl, from the Johannes Gutenberg University in Mainz, Germany, stumbled across the impact while examining pines at Kåfjord near Alta.

The dendrochronologist was collecting wood cores to build up a picture of past climate in the area. Severe cold and even infestation from insects can severely stunt annual growth in a stand, but neither of these causes could explain the total absence of rings seen in some trees dated to 1945.

A colleague suggested it could have something to do with the Tirpitz, which was anchored the previous year at Kåfjord where it was attacked by Allied bombers.

Archive documents show the ship released chlorosulphuric acid to camouflage its position.

"We think this artificial smoke damaged the needles on the trees," Dr Hartl told BBC News.

"If trees don't have needles they can't photosynthesise and they can't produce biomass. In pine trees, needles usually last from three to seven years because they're evergreens. So, if the trees lose their needles, it can take a very long time for them to recover."

In one tree, there is no growth seen for nine years from 1945. "Afterwards, it recovered but it took 30 years to get back to normal growth. It's still there; it's still alive, and it's a very impressive tree," Dr Hartl said.

In other pines, rings are present but they are extremely thin - easy to miss. As expected, sampling shows the impacts falling off with distance. But it is only at 4km that trees start to display no effects.

The Tirpitz sustained some damage at Kåfjord. However, a continuous seek-and-destroy campaign eventually caught up with the battleship and it was sunk by RAF Lancasters in late 1944 in Tromso fjord further to the west.

Dr Hartl believes her "warfare dendrochronology" will find similar cases elsewhere.

"I think it's really interesting that the effects of one engagement are still evident in the forests of northern Norway more than 70 years later. In other places in Europe, they also used this artificial smoke and maybe also other chemicals. So perhaps you can find similar patterns and effects from WWII."

The Mainz researcher presented her research here at the European Geosciences Union (EGU) General Assembly in Vienna, Austria.
Tree samples
Sampling shows the impacts falling off with distance



Enviado por jcp el 15 abril 2018 00:00:00 (12 Lecturas)






Artículos e imágenes de:
Aspectos históricos legales regulatorios
Aspectos históricos legales regulatorios
 Contaminantes, ecología y ecotoxicología
Contaminantes, ecología y ecotoxicología
 Unión Europea
Unión Europea

 
     Enlaces Relacionados


Noticia más leída sobre Aspectos históricos legales regulatorios:
¿Qué es el polonio 210?,¿Dónde se suele dar y cómo se puede obtener?, a propósito de Arafat


     Votos del Artículo
Puntuación Promedio: 0
votos: 0

Por favor tómate un segundo y vota por este artículo:

Excelente
Muy Bueno
Bueno
Regular
Malo


     Publicidad






Todos los logos y marcas registradas son propiedad de sus respectivos dueños. Los comentarios son propiedad de quienes lo envían, todo el resto © 2006-2011 by Sertox.

Webs Asociadas: www.country2.com / Radio FM Estacion San Pedro / Lombó Teatro Salamanca - Zamora

PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.
Página Generada en: 0.04 Segundos