scholarly journals Total nitrogen dioxide at the Arctic Polar Circle since 1990

1994 ◽  
Vol 21 (13) ◽  
pp. 1371-1374 ◽  
Author(s):  
Florence Goutail ◽  
Jean Pierre Pommereau ◽  
Alain Sarkissian ◽  
Esko Kyro ◽  
Valery Dorokhov
Keyword(s):  
Nitrogen Dioxide ◽  
Total Nitrogen ◽  
The Arctic

Perturbation of stratospheric nitrogen dioxide by volcanic aerosol in the Arctic

1994 ◽  
Vol 21 (13) ◽  
pp. 1411-1414 ◽  
Author(s):  
E. Lateltin ◽  
J.-P. Pommereau ◽  
H. Le Texier ◽  
M. Pirre ◽  
R. A. Ramaroson
Keyword(s):  
Nitrogen Dioxide ◽  
The Arctic ◽  
Volcanic Aerosol

scholarly journals Mercury in Sediment Core Samples From Deep Siberian Ice-Rich Permafrost

2021 ◽  
Vol 9 ◽  
Author(s):  
Clara Rutkowski ◽  
Josefine Lenz ◽  
Andreas Lang ◽  
Juliane Wolter ◽  
Sibylle Mothes ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Susceptibility ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Total Nitrogen ◽  
The Arctic ◽  
Specific Magnetic Susceptibility ◽  
Shallow Soils

We determine Hg concentrations of various deposits in Siberia’s deep permafrost and link sediment properties and Hg enrichment to establish a first Hg inventory of late Pleistocene permafrost down to a depth of 36 m below surface. As Arctic warming is transforming the ice-rich permafrost of Siberia, sediment is released and increases the flux of particulates to the Arctic shelf seas through thawing coasts, lakeshores, and river floodplains. Heavy metals within soils and sediments are also released and may increasingly enter Arctic waters and the biological food chain. High levels of mercury (Hg) have been reported from shallow soils across the Arctic. Rapid thawing is now mobilizing sediment from deeper strata, but so far little is known about Hg concentrations in deep permafrost. Here, forty-one samples from sediment successions at seven sites and of different states of permafrost degradation on Bykovsky Peninsula (northern Yakutian coast) and in the Yukechi Alas region (Central Yakutia) were analyzed for Hg, total carbon, total nitrogen, and total organic carbon as well as grain-size distribution, bulk density, and mass specific magnetic susceptibility. We show average Hg concentrations of 9.72 ± 9.28 μg kg−1 in the deep sediments, an amount comparable to the few previous Arctic studies existing, and a significant correlation of Hg content with total organic carbon, total nitrogen, grain-size distribution, and mass specific magnetic susceptibility. Hg concentrations are higher in the generally sandier sediments of the Bykovsky Peninsula than in the siltier sediments of the Yukechi Alas. The ratio of Hg to total organic carbon in this study is 2.57 g kg−1, including samples with very low carbon content. We conclude that many deep permafrost sediments, some of which have been frozen for millennia, contain elevated concentrations of Hg and the stock of Hg ready to be released by erosion is of significance for the Arctic ecosystem. The Hg mobilized may accumulate on the way to or in the shallow sea, and where it enters into active biogeochemical cycles of aquatic systems it may concentrate in food webs. Our study highlights the need for better understanding Hg stocks and Hg release from permafrost.

Anomalous behavior of the total nitrogen dioxide content in the stratosphere over Tomsk in 2011

2012 ◽  
Author(s):  
Aleksey V. Nevzorov ◽  
Mikhail V. Grishaev ◽  
Natalya S. Salnikova
Keyword(s):  
Nitrogen Dioxide ◽  
Total Nitrogen ◽  
Anomalous Behavior

Mountain wave-induced variations of ozone and total nitrogen dioxide contents over the Subpolar Urals

2017 ◽  
Vol 475 (2) ◽  
pp. 958-962 ◽  
Author(s):  
V. N. Kozhevnikov ◽  
N. F. Elansky ◽  
K. B. Moiseenko
Keyword(s):  
Nitrogen Dioxide ◽  
Total Nitrogen ◽  
Mountain Wave ◽  
Subpolar Urals ◽  
Wave Induced

The Effect of Vitamin A on the Intermittent Nitrogen Dioxide Gas Exposure in Hamsters

1976 ◽  
Vol 34 ◽  
pp. 176-177
Author(s):  
J.C.S. Kim ◽  
M.G. Jourden ◽  
E.S. Carlisle
Keyword(s):  
Electron Microscopy ◽  
Vitamin A ◽  
Nitrogen Dioxide ◽  
Chronic Exposure ◽  
Light And Electron Microscopy ◽  
Specific Effect ◽  
Deficient Diet ◽  
Intermittent Exposure ◽  
Hypovitaminosis A ◽  
Gas Exposure

Chronic exposure to nitrogen dioxide in rodents has shown that injury reaches a maximum after 24 hours, and a reparative adaptive phase follows (1). Damage occurring in the terminal bronchioles and proximal portions of the alveolar ducts in rats has been extensively studied by both light and electron microscopy (1).The present study was undertaken to compare the response of lung tissue to intermittent exposure to 10 ppm of nitrogen dioxide gas for 4 hours per week, while the hamsters were on a vitamin A deficient diet. Ultrastructural observations made from lung tissues obtained from non-gas exposed, hypovitaminosis A animals and gas exposed animals fed a regular commercially prepared diet have been compared to elucidate the specific effect of vitamin A on nitrogen dioxide gas exposure. The interaction occurring between vitamin A and nitrogen dioxide gas has not previously been investigated.

The Arctic Climate System

2005 ◽  
Author(s):  
Mark C. Serreze ◽  
Roger G. Barry
Keyword(s):  
Climate System ◽  
Arctic Climate ◽  
The Arctic
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