A 4.2 million years record of interglacial paleoclimate from sclerochronological data of Florida carbonate platform (Early Pliocene to recent)
A 4.2 million years record of interglacial paleoclimate from sclerochronological data of Florida carbonate platform (Early Pliocene to recent)
复制标题
佛罗里达碳酸盐台地的硬化年代学数据记录了 4200 万年间冰期古气候（上新世早期至近代）
DOI：
10.1016/j.gloplacha.2014.06.001
复制
发表时间：
2014
影响因子：
3.9
通讯作者：
Petuch
中科院分区：
文献类型：
--
作者：
Brachert;Reuter;Krüger;Lohmann;Petuch
上新世和早更新世的气候是一个短暂的模式，从普遍较温暖的气候新第三纪早期的最大冰川的第四纪晚期。在高纬度地区，气温的降低越来越剧烈，而低纬度地区则保持温暖。在过去的500万年（Ma）中，在西大西洋暖池中记录了相当恒定的海面温度;然而，迄今为止缺乏关于浅近岸环境温度和湿度的直接气候数据。在这项研究中，我们提出了26个新的和46（包括）的合成。24最近）发表的硬年代学稳定同位素记录（18 O/16 O，13 C/12 C）与亚年度的分辨率从珊瑚礁（Z-珊瑚）和软体动物。这些化石取自佛罗里达碳酸盐台地的浅水碳酸盐沉积物，属于12个间冰期时间切片，时间跨度从上新世早期到最近（4.2到0 Ma）。虽然台地碳酸盐岩被认为是经历快速成岩稳定化由于溶解的亚稳文石壳，我们表明，仍然有大量的材料可供大规模系统的地球化学研究。我们排除了显着的成岩修改的稳定同位素数据，因为测量18 O/16 O比从Z-珊瑚和软体动物转换成温度得到一致的结果。因此，在最近4.2 Ma期间，开放沃茨的年平均温度从~ 23 °C上升到26 °C，因为现代海水18 O/16 O值对新近纪是有效的。然而，由于冰量的长期增加，即使在间冰期，全球水价值也发生了变化，相当于2.3 °C的温度上升。然而，在过去4.2 Ma中，温度净增加5.3 °C与深海记录不一致，并暗示测量的18 O/16 O湿度效应总体增加。特别冷的温度已登记在1.9和2.5 Ma，但结合18 O/16 O和13 C/12 C数据确定这些作为文物从强化蒸发，适合在这些时间片的整体限制海洋方面的化石动物群。季节性温度差异似乎在有限的环境中很高（约11 °C），在混合开放的海洋单元中很小（7-8 °C）。虽然这一发现符合现代情况，沿海环境经历14 °C的季节变化和礁区7-9 °C，间接证据表明，重建是有偏见的，在当地海水的18 O/16 O值的年际变化。由于18 O/16 O的季节性增加，在过去的4.2马，我们建议现代佛罗里达的湿度已经从过去的间冰期干燥的前体气候演变而来，而温度在本质上保持不变。这一趋势可能代表了Rupdas高压电池日益重要的表现。佛罗里达的冰川气候不能使用我们的方法重建的佛罗里达平台是在海平面低水位期间出现。
The climate of the Pliocene and early Pleistocene was in a transient mode from generally warmer climates of the early Neogene to the maximum glaciations of the late Quaternary. Increasingly severe coolings occurred episodically in the high latitudes, whereas the low latitudes remained warm. For the last 5 million years (Ma), rather constant sea surface temperatures have been recorded in the Western Atlantic warm pool; however, direct climate data on temperature and humidity from shallow near-shore settings are lacking so far. In this study we present a synthesis of 26 new and 46 (incl. 24 recent) published sclerochronogical stable isotope records (18O/16O,13C/12C) with a sub-annual resolution from reef corals (z-corals) and mollusks. The fossils were sampled from shallow-water carbonate deposits of the Florida carbonate platform and belong to 12 interglacial time-slices spanning collectively the period from the Early Pliocene to the recent (4.2 to 0 Ma). Although platform carbonates are believed to undergo rapid diagenetic stabilization due to the dissolution of metastable aragonite shells, we show that there is still a wealth of material to be recovered for large-scale systematic geochemical studies. We rule out significant diagenetic modifications of the stable isotope data because measured18O/16O ratios from z-corals and mollusks converted into temperature give consistent results. Accordingly, annual mean temperatures have risen during the last 4.2 Ma from ~ 23 °C to 26 °C in open waters, given the modern seawater value of18O/16O is valid for Neogene. However, the global water value has changed due to long-term increases in ice volume even during interglacials, equivalent with a 2.3 °C temperature rise. A net 5.3 °C temperature increase over the last 4.2 Ma is inconsistent with the deep-sea record, however, and suggestive of an overall increase of humidity effects in measured18O/16O instead. Particularly cool temperatures have been registered at 1.9 and 2.5 Ma, but combined18O/16O and13C/12C data identify these as artifacts from intensified evaporation which fits the overall restricted marine aspect of the fossil fauna in these time-slices. Seasonal temperature contrasts seem to have been high within restricted settings (~ 11 °C) and small in mixed open marine units (7–8 °C). Although this finding fits the modern situation with coastal environments undergoing 14 °C seasonal change and the reef tract 7–9 °C only, circumstantial evidence suggests reconstructions to be biased by sub-annual changes in the local seawater value for18O/16O. Since18O/16O seasonality has increased over the last 4.2 Ma, we suggest the humidity of modern Florida to have evolved from dryer precursor climates of past interglacials, whereas temperatures in essence remained the same. This trend possibly represents the expression of the growing relevance of the Bermudas High pressure cell. Glacial climates of Florida cannot be reconstructed using our methodology as the Florida platform was emergent during sea level lowstands.
登录
查看更多内容
影响因子：
64.8
作者：
Tsuyoshi Watanabe;A. Suzuki;S. Minobe;Tatsunori Kawashima;K. Kameo;K. Minoshima;Y. M. Aguilar;Ryoji Wani;H. Kawahata;K. Sowa;T. Nagai;T. Kase
通讯作者：
Tsuyoshi Watanabe;A. Suzuki;S. Minobe;Tatsunori Kawashima;K. Kameo;K. Minoshima;Y. M. Aguilar;Ryoji Wani;H. Kawahata;K. Sowa;T. Nagai;T. Kase
佛罗里达州上新世软体动物壳稳定同位素剖面的上升流、季节性和生长记录
影响因子：
1.5
作者：
Douglas S. Jones;W. Allmon
通讯作者：
W. Allmon
Mercenaria Mercenaria、M. Campechiensis 及其自然杂交形式的同位素硬化年代学：基因型重要吗？
影响因子：
3.5
作者：
D. Surge;G. M. Kelly;W. S. Arnold;Stephen P. Geiger;A. E. Goewert;K. Walker
通讯作者：
K. Walker
上新世中期佛罗里达州西南部季节到十年尺度的气候变化：来自珊瑚稳定同位素记录的推论
影响因子：
--
作者：
L. M. Roulier;T. Quinn
通讯作者：
T. Quinn
石珊瑚生长带的成岩作用：识别和保存模式
影响因子：
1.8
作者：
M. Reuter;T. Brachert;K. Kroeger
通讯作者：
K. Kroeger