You need JavaScript to view this

Latitudinal effect in the transport of radiocarbon from stratosphere to troposphere; Eflet de la latitude sur le transport du radiocarbone de la stratosphere a la troposphere; Vliyanie geograficheskoj shiroty na peremeshchenie radioaktivnogo ugleroda iz stratosfery v troposferu; Efecto de la latitud sobre el transporte del carbono radiactivo de la estratosfera a la troposfera

Abstract

The large amount of bomb-produced carbon-14 (approx. 3 Mc), which has been released chiefly in the stratosphere, offers possibilities of investigating the routes of transport of carbon dioxide from the stratosphere to the troposphere, as well as the mixing times within the stratosphere and the troposphere. This is done by measuring the rates of increase in the C{sup 14} content of atmospheric CO{sub 2} and of plant material. Such measurements are available from many different localities. Carbon-14 measurements in Denmark on cereals have shown that during 1958 and 1959 the increase in C{sup 14} content was several per cent higher in this country than the average increase for the hemisphere. By the summer of 1959 the C{sup 14} content was 33 % above the 1954 level. The large increases in 1958 and 1959 are probably a C{sup 14} parallel to the spring peaks in Sr{sup 90} fallout found in the North Temperate Zone in the same years. The additional increase in the C{sup 14} content of Danish cereals above the average for the hemisphere suggests latitudinal variations in C{sup 14} contamination. This is in keeping with the findings for particulate fallout, which is brought down from the stratosphere by a  More>>
Authors:
Tauber, Henrik [1] 
  1. Carbon-14 Dating Laboratory, Dept. of Natural Sciences, National Museum, Copenhagen (Denmark)
Publication Date:
Jan 15, 1962
Product Type:
Conference
Resource Relation:
Conference: Conference on the Use of Radioisotopes in the Physical Sciences and Industry, Copenhagen (Denmark), 6-17 Sep 1960; Other Information: 1 fig., 1 tab., 17 refs; Related Information: In: Radioisotopes in the Physical Sciences and Industry. Proceedings of the Conference on the Use of Radioisotopes in the Physical Sciences and Industry. V. 1| 556 p.
Subject:
54 ENVIRONMENTAL SCIENCES; BOMBS; CARBON 14; CARBON DIOXIDE; CEREALS; CONTAMINATION; FALLOUT; LOCALITY; MIXING; PARTICLE TRACKS; PEAKS; STRATOSPHERE; STRONTIUM 90; TROPOSPHERE
OSTI ID:
22025615
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); United Nations Educational, Scientific and Cultural Organization, Paris (France)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA12N1594112908
Submitting Site:
INIS
Size:
page(s) 67-74
Announcement Date:
Jan 16, 2013

Citation Formats

Tauber, Henrik. Latitudinal effect in the transport of radiocarbon from stratosphere to troposphere; Eflet de la latitude sur le transport du radiocarbone de la stratosphere a la troposphere; Vliyanie geograficheskoj shiroty na peremeshchenie radioaktivnogo ugleroda iz stratosfery v troposferu; Efecto de la latitud sobre el transporte del carbono radiactivo de la estratosfera a la troposfera. IAEA: N. p., 1962. Web.
Tauber, Henrik. Latitudinal effect in the transport of radiocarbon from stratosphere to troposphere; Eflet de la latitude sur le transport du radiocarbone de la stratosphere a la troposphere; Vliyanie geograficheskoj shiroty na peremeshchenie radioaktivnogo ugleroda iz stratosfery v troposferu; Efecto de la latitud sobre el transporte del carbono radiactivo de la estratosfera a la troposfera. IAEA.
Tauber, Henrik. 1962. "Latitudinal effect in the transport of radiocarbon from stratosphere to troposphere; Eflet de la latitude sur le transport du radiocarbone de la stratosphere a la troposphere; Vliyanie geograficheskoj shiroty na peremeshchenie radioaktivnogo ugleroda iz stratosfery v troposferu; Efecto de la latitud sobre el transporte del carbono radiactivo de la estratosfera a la troposfera." IAEA.
@misc{etde_22025615,
title = {Latitudinal effect in the transport of radiocarbon from stratosphere to troposphere; Eflet de la latitude sur le transport du radiocarbone de la stratosphere a la troposphere; Vliyanie geograficheskoj shiroty na peremeshchenie radioaktivnogo ugleroda iz stratosfery v troposferu; Efecto de la latitud sobre el transporte del carbono radiactivo de la estratosfera a la troposfera}
author = {Tauber, Henrik}
abstractNote = {The large amount of bomb-produced carbon-14 (approx. 3 Mc), which has been released chiefly in the stratosphere, offers possibilities of investigating the routes of transport of carbon dioxide from the stratosphere to the troposphere, as well as the mixing times within the stratosphere and the troposphere. This is done by measuring the rates of increase in the C{sup 14} content of atmospheric CO{sub 2} and of plant material. Such measurements are available from many different localities. Carbon-14 measurements in Denmark on cereals have shown that during 1958 and 1959 the increase in C{sup 14} content was several per cent higher in this country than the average increase for the hemisphere. By the summer of 1959 the C{sup 14} content was 33 % above the 1954 level. The large increases in 1958 and 1959 are probably a C{sup 14} parallel to the spring peaks in Sr{sup 90} fallout found in the North Temperate Zone in the same years. The additional increase in the C{sup 14} content of Danish cereals above the average for the hemisphere suggests latitudinal variations in C{sup 14} contamination. This is in keeping with the findings for particulate fallout, which is brought down from the stratosphere by a similar circulation mechanism. Latitudinal effects of this magnitude make it possible to track the routes of transport from the stratosphere to the troposphere by direct measurements of the C{sup 14} activity of tropospheric CO{sub 2} from a number of widespread sampling stations. The magnitude of a possible latitudinal effect in the pre-bomb steady state is estimated. Such an effect may be part of the explanation of the short-term oscillations in carbon-14 activity found in tree-rings from the last 1300 years. (author) [French] Les grandes quantites de carbone-14 (environ 3 Mc) que l'explosion de bombes a liberees, principalement dans la stratosphere, offrent la possibilite d'etudier les voies suivies par le gaz carbonique entre la stratosphere et la troposphere, ainsi que les temps de melange a l'interieur de la stratosphere et de la troposphere. A cet effet, on mesure le taux d'accroissement de la teneur en carbone-14 du CO{sub 2} atmospherique et de certains vegetaux. Ces donnees sont actuellement recueillies dans de nombreuses localites differentes. Il ressort des mesures effectuees au Danemark sur des cereales qu'en 1958 et 1959 la teneur en carbone-14 de ces cereales y accusait une augmentation superieure de plusieurs centiemes a l'augmentation moyenne pour l'hemisphere nord. Au cours de l'ete 1959, la teneur en carbone-14 etait superieure de 33% au niveau de 1954. Les accroissements considerables ainsi intervenus en 1958 et 1959 sont sans doute un phenomene parallele aux , printanieres des retombees de strontium-90, enregistrees au cours de ces memes annees dans la zone temperee boreale. Ayant ainsi constate que la teneur en carbone-14 des cereales danoises est superieure a la moyenne relevee pour l'hemisphere, on peut supposer que la contamination par le carbone-14 varie selon la latitude. Cela concorde avec les observations faites au sujet de la retombee de particules qui descendent de la stratosphere par un mecanisme circulatoire analogue. Des effets latitudinaux de cette importance permettent de determiner les voies empruntees par le CO{sub 2} entre la stratosphere et la troposphere, en mesurant directement la radioactivite du carbone-14 que contient le CO{sub 2} tropospherique recueilli par un certain nombre de stations d'echantillonnage disseminees. L'auteur evalue l'ordre de grandeur de l'effet possible de la latitude lors de l'etat stable avant la bombe. Cet effet peut expliquer en partie les variations a court terme de l'activite du carbone-14, constatees dans les cercles annuels des arbres au cours des 1300 dernieres annees. (author) [Spanish] La gran cantidad de carbono-14 (aproximadamente 3 Mc) que las explosiones atomicas han liberado, principalmente en la estratosfera, permite estudiar los caminos seguidos por el anhidrido carbonico al descender de la estratosfera a la troasi posfera, como la velocidad de mezcla en la estratosfera y la troposfera. Estos estudios pueden efectuarse midiendo la velocidad con que aumenta el contenido de {sup 14}C en el CO{sub 2} atmosferico y en muestras de origen vegetal. Se dispone de los resultados de mediciones de esa indole, efectuadas en muchos lugares diferentes. Las mediciones del carbono-14 contenido en los cereales, que se han llevado a cabo en Dinamarca han permitido comprobar que durante los anos 1958 y 1959 el aumento del contenido de {sup 14}C era en ese pais superior en varias unidades de por ciento al aumento medio correspondiente al hemisferio norte. En el verano de 1959, el contenido de {sup 14}C supero en un 33 por ciento al valor obtenido en 1954. Es probable que los grandes aumentos observados en 1958 y en 1959 constituyan un fenomeno paralelo a los maximos primaverales de precipitacion del {sup 90}Sr registrados en los mismos anos en la zona templada del hemisferio norte. Como el aumento del contenido de {sup 14}C de los cereales de Dinamarca es superior al promedio correspondiente al hemisferio noret, puede suponerse que la contaminacion por el {sup 14}C varia con la latitud. Esto concuerda con las observaciones efectuadas al estudiar la precipitacion de particulas, que descienden de la estratosfera en virtud de un mecanismo de circulacion analogo. Los efectos en funcion de la latitud, cuando son do esta importancia, permiten identificar los caminos seguidos en el transporte de la estratosfera a la troposfera, por medicion directa de la actividad del {sup 14}C contenido en el CO{sub 2} troposferico recogido por una serie de estaciones de muestreo repartidas por una vasta zona. Los autores determinan la influencia de un posible efecto de la latitud sobre el estado de equilibrio anterior a los ensayos de armas nucleares. Tal efecto podria explicar en parte las oscilaciones de corto periodo en la actividad del {sup 14}C que se observan en los anillos concentricos de los arboles de los ultimos 1300 anos. (author) [Russian] Bol'shoe kolichestvo vydelennogo vzryvami bomb ugleroda-14 (priblizitel'no 3 Mc), kotoryj byl vybroshen glavnym obrazom v stratosferu, daet vozmozhnost' issledovat' puti pereneseniya uglekislogo gaza iz stratosfery v troposferu, a takzhe opredelit' vremya smeshivaniya v stratosfere i v troposfere. EHto dostigaetsya putem zamera tempa uvelicheniya soderzhaniya C{sup 14} v atmosfernom CO{sub 2} i v tkanyakh rastenij. Takie zamery sushchestvuyut dlya mnogikh mest. Izmerenie kolichestva ugleroda-14 na khlebnykh zlakakh v Danii pokazalo, chto v Danii za 1958-59 gg. soderzhanie S14 uvelichilos' na mnogo protsentov bol'she, chem srednee uvelichenie dlya vsego zapadnogo polushariya. K letu 1959 goda soderzhanie C{sup 14} prevysilo na 33% uroven' 1954 goda. Znachitel'nye uvelicheniya soderzhaniya C{sup 14} v 1958 i 1959 godakh, veroyatno, yavlyayutsya parallel'yu s pikovym vypadeniem strontsiya-90, obnaruzhennogo vesnoyu v te zhe samye gody v severnoj umerennoj zone. Prevyshenie soderzhaniya C{sup 14} v datskikh zlakakh svyshe urovnya dlya vsego zapadnogo polushariya zastavlyaet dumat', chto zagryaznenie C{sup 14} izmenyaetsya v zavisimosti ot geograficheskoj shiroty. EHto sootvetstvuet zaklyucheniyam, svyazannym s vypadeniem chastits, kotorye pri- nosyatsya iz stratosfery analogichnym tsirkulyatsionnym mekhanizmom. Takoe vozdejstvie geograficheskoj shiroty daet vozmozhnost' prosledit' puti pereneseniya radioaktivnogo ugleroda iz stratosfery v troposferu putem neposredstvennogo zamera aktivnosti C{sup 14} troposfericheskogo CO{sub 2} iz tselogo ryada obraztsov, sobiraemykh na shiroko rasseyannoj seti stantsij. V doklade daetsya otsenka masshtaba vozmozhnogo vozdejstviya geograficheskoj shiroty v otnoshenii ustojchivogo polozheniya do vzryva bomby. EHto vozdejstvie mozhet yavit'sya chast'yu ob{sup y}asneniya kratkosrochnykh ostsillyatsij v aktivnosti ugleroda-14, obnaruzhennoj v drevesnykh kol'tsakh s vozrastom do 1300 let. (author)}
place = {IAEA}
year = {1962}
month = {Jan}
}