Modelling equable climates of the Late Cretaceous: Can new boundary conditions resolve data-model discrepancies?

Modelling equable climates of the Late Cretaceous: Can new boundary conditions resolve data-model discrepancies?
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模拟晚白垩世的均匀气候:新的边界条件能否解决数据模型的差异?

DOI:
10.1016/j.palaeo.2013.08.009
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发表时间:
2013
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Hunter S
Hunter S
中科院分区:
--
文献类型:
--
作者:
Hunter S

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使用 HadCM3L 全耦合大气-海洋模型和 TRIFFID 动态植被模型对白垩纪晚期(马斯特里赫特阶)气候和植被进行建模。我们通过探索模拟陆地气候对植被处理、大气 pCO2 水平变化以及北极航道连接的表征的敏感性,研究高纬度地区和大陆内部的数据模型不一致问题。我们通过使用千禧年规模的 GCM 运行和动态植被来扩展之前的工作,以改进海洋热传输和陆地边界条件的表示。结合现实的植被会通过减少地表反照率和诱导的大气-海洋反馈来驱动高纬度变暖,特别是在夏季。由此产生的区域升温可能超过 10°C。由于落叶树向常绿树的变化增加了反照率,一些地区的天冬氨酸CO2 上升,温度变冷。结合增强的北极连通性,重新配置的海洋热传输导致区域范围内陆地广泛变暖约 3°C 和 > 5°C。将敏感性与重要的古植物学数据相结合,北部高纬度地区和大陆内陆地区的模型不一致仍然存在。需要开展进一步的工作来解决气候和植被模型的缺陷,并改进定量气候敏感地质代理的解释和地理分布。
Late Cretaceous (Maastrichtian) climate and vegetation is modelled using the HadCM3L fully-coupled atmosphere–ocean model and the TRIFFID dynamic vegetation model. We investigate data–model inconsistencies in the high-latitudes and continental interiors by exploring the sensitivity of modelled terrestrial climate to vegetation treatment, changing atmosphericpCO2levels and the representation of Arctic seaway connections. We expand on previous work by using millennial-scale GCM runs with dynamic vegetation to allow for improved representations of ocean heat transport and terrestrial boundary conditions.Incorporating realistic vegetation drives high-latitude warming particularly during summer through reductions in surface albedo and induced atmosphere–ocean feedbacks. Resulting regional warming can exceed 10 °C. AspCO2rises some regions cool as deciduous to evergreen change increases albedo. Incorporating enhanced Arctic connectivity, reconfigured ocean heat transport drives widespread terrestrial warming of ~ 3 °C and > 5 °C regionally. Applying sensitivities in combination significant palaeobotanical data–model inconsistencies in the northern high-latitudes and continental interiors remain. Further work is required to resolve climate and vegetation model deficiencies and improve the interpretation and geographic distribution of quantitative climate-sensitive geological proxies.
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