TY - JOUR

T1 - Disequilibrium Uranium (234U/238U) in Natural Aqueous Objects and Climatic Variations: World Ocean

T2 - World Ocean

AU - Tokarev, I. V.

AU - Yakovlev, E. Yu

AU - Zykov, S. B.

AU - Zimina, I. A.

N1 - Tokarev, I.V., Yakovlev, E.Y., Zykov, S.B. et al. Disequilibrium Uranium (234U/238U) in Natural Aqueous Objects and Climatic Variations: World Ocean. Geochem. Int. 59, 895–902 (2021). https://proxy.library.spbu.ru:2060/10.1134/S001670292109007X

PY - 2021/9/1

Y1 - 2021/9/1

N2 - Natural waters usually demonstrate the disturbance of radioactive equilibrium between parent U-238 and and daughter U-234 (usually, U-234/U-238 approximate to 0.8-3 in activities). The ratio of U-234/U-238 > 10 found in groundwaters can be explained by climatic variations, and it is result of U-234 accumulation in permafrost rocks during cold periods and its more rapid loss compared to U-238 during thawing. We tested this hypothesis for data on uranium isotope composition in water, and also chemo- and biogenic formations of the World Ocean. Most significant enrichment in U-234 is discovered in the northern and internal seas during climatic warmings, which is consistent with an inferred influence of the permafrost formation and degradation on the anomalous increase of U-234/U-238 in groundwaters. Sampling of the Barents Sea shows that the uranium-234 enrichment in oceanic water increases with increase (a) of isolation from oceanic circulation system, (b) of the relative length of the coastal line, (c) and the contribution of continental waters to the chemical balance of the basin.

AB - Natural waters usually demonstrate the disturbance of radioactive equilibrium between parent U-238 and and daughter U-234 (usually, U-234/U-238 approximate to 0.8-3 in activities). The ratio of U-234/U-238 > 10 found in groundwaters can be explained by climatic variations, and it is result of U-234 accumulation in permafrost rocks during cold periods and its more rapid loss compared to U-238 during thawing. We tested this hypothesis for data on uranium isotope composition in water, and also chemo- and biogenic formations of the World Ocean. Most significant enrichment in U-234 is discovered in the northern and internal seas during climatic warmings, which is consistent with an inferred influence of the permafrost formation and degradation on the anomalous increase of U-234/U-238 in groundwaters. Sampling of the Barents Sea shows that the uranium-234 enrichment in oceanic water increases with increase (a) of isolation from oceanic circulation system, (b) of the relative length of the coastal line, (c) and the contribution of continental waters to the chemical balance of the basin.

KW - U/U

KW - climatic variations

KW - disequilibrium uranium

KW - permafrost

KW - World Ocean

KW - RAPID FLUCTUATIONS

KW - SEA-LEVEL

KW - RADIOCARBON

KW - MASS-SPECTROMETRY

KW - GLOBAL CLIMATE

KW - HUON PENINSULA

KW - DEEP-SEA

KW - LONG-TERM SAFETY

KW - U-234

KW - U-238

KW - CORAL TERRACES

KW - WATER

KW - 234U/238U

UR - http://www.scopus.com/inward/record.url?scp=85114271905&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/97ed07aa-1929-38a3-b3ff-f3eb8524b75e/

U2 - 10.1134/s001670292109007x

DO - 10.1134/s001670292109007x

M3 - Article

AN - SCOPUS:85114271905

VL - 59

SP - 895

EP - 902

JO - Geochemistry International

JF - Geochemistry International

SN - 0016-7029

IS - 9

ER -