Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency

Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
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南极洲东部阿德利盆地记录的铍同位素变化反映了全新世冰动力学、生产力和清除效率的变化

DOI:
10.1016/j.qsa.2022.100054
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发表时间:
2022
影响因子:
4.5
通讯作者:
Dunbar, Robert B.
Dunbar, Robert B.
中科院分区:
--
文献类型:
--
作者:
Behrens, Bethany C.;Yokoyama, Yusuke;Miyairi, Yosuke;Sproson, Adam D.;Yamane, Masako;Jimenez-Espejo, Francisco J.;McKay, Robert M.;Johnson, Katelyn M.;Escutia, Carlota;Dunbar, Robert B.

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阿德利海盆是一个相对较小(约1600平方公里)的半封闭大陆架水深洼地,位于威尔克斯冰下海盆附近,该海盆位于东南极冰盖的一部分之下,含有相当于海平面1.3 -4米的冰。位于阿德利盆地内的是一个184米厚的层状沉积物存款,阿德利漂移,非常适合研究冰盖和海洋动力学的区域变化。在这里,我们研究反应性铍-10反应性铍-9((10 Be/9 Be)reac)在海洋沉积物芯从阿德利漂移,以评估这些变化在全新世时期(11.7万年BP到现在)。(10 Be/9 Be)反应记录提供了对淡水输入、初级生产力和清除效率变化的深入了解,同时消除了颗粒大小对10 Be浓度的影响。在全新世早期,(10 Be/9 Be)的再比值表明,增加的融水排放约。11.7到10 ka BP,因为接地冰从阿德利盆地和邻近的测深高点撤退。在距今约10 ka BP后,铍同位素的影响清除效率和稀释控制的洋流和积累率,操作旁边的融水输入,这表明有额外的因素要考虑使用(10 Be/9 Be)reacas代理冰架覆盖和冰川动力学。
The Adélie Basin is a relatively small (∼1600 km2), semi-enclosed continental shelf bathymetric depression located adjacent to the Wilkes Subglacial Basin, a basin underlying a sector of the East Antarctic Ice Sheet that contains ∼3–4 m sea level equivalent of ice. Located within the Adélie Basin is a ∼184 m thick laminated sediment deposit, the Adélie Drift, ideal for examining regional changes in ice sheet and ocean dynamics. Here, we examine the ratio of reactive beryllium-10 to reactive beryllium-9 ((10Be/9Be)reac) in a marine sediment core obtained from the Adélie Drift to assess these changes during the Holocene epoch (11.7 ka BP to present). The (10Be/9Be)reacrecord provides insight into changes in freshwater input, primary productivity, and scavenging efficiency, while removing the influence of particle size on10Be concentration. During the early Holocene, (10Be/9Be)reacratios indicate increased meltwater discharge from ca. 11.7 to 10 ka BP, as grounded ice retreated from the Adélie Basin and adjacent bathymetric highs. After ∼10 ka BP, beryllium isotopes are influenced by scavenging efficiency and dilution controlled by ocean currents and accumulation rate, operating alongside meltwater input, suggesting there are additional factors to consider when using (10Be/9Be)reacas a proxy for ice shelf cover and glacial dynamics.
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