Transient climate simulations of the deglaciation 21-9 thousand years before present (version 1)-PMIP4 Core experiment design and boundary conditions
Transient climate simulations of the deglaciation 21-9 thousand years before present (version 1)-PMIP4 Core experiment design and boundary conditions
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DOI：
10.5194/gmd-9-2563-2016
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发表时间：
2016-01-01
影响因子：
5.1
通讯作者：
Tarasov, Lev
中科院分区：
文献类型：
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作者：
Ivanovic, Ruza F.;Gregoire, Lauren J.;Tarasov, Lev
末次冰消期标志着末次冰期和现在间冰期之间的过渡，其间发生了一系列快速（百年和十年）气候变化。数值气候模型对于研究气候变化事件的机制非常有用，特别是现在一些复杂的模型可以运行数千年。我们已经成立了一个古气候模拟相互比较项目（PMIP）工作组，以协调对最后一次冰川消退进行瞬态模拟的工作，并促进模拟人员和从事重建过去21000年气候的人员之间的专业知识传播。在这里，我们提出了一个协调的核心实验的设计，在21- 9000年前（ka）的时间变化的轨道强迫，温室气体，冰盖和其他地理变化。给出了两个冰盖重建的选择，我们提出建议，规定冰融水（或不）的核心实验。工作组还将临时协调额外的重点模拟，例如更彻底地调查冰融水对气候系统演变的影响，并审查其他强迫的不确定性。其中一些集中的模拟将针对特定事件的较短持续时间，以便更详细地了解它们，并允许计算成本更高的模型参与其中。
The last deglaciation, which marked the transition between the last glacial and present interglacial periods, was punctuated by a series of rapid ( centennial and decadal) climate changes. Numerical climate models are useful for investigating mechanisms that underpin the climate change events, especially now that some of the complex models can be run for multiple millennia. We have set up a Paleoclimate Modelling Intercomparison Project ( PMIP) working group to coordinate efforts to run transient simulations of the last deglaciation, and to facilitate the dissemination of expertise between modellers and those engaged with reconstructing the climate of the last 21 000 years. Here, we present the design of a coordinated Core experiment over the period 21-9 thousand years before present ( ka) with time-varying orbital forcing, greenhouse gases, ice sheets and other geographical changes. A choice of two ice sheet reconstructions is given, and we make recommendations for prescribing ice meltwater ( or not) in the Core experiment. Additional focussed simulations will also be coordinated on an ad hoc basis by the working group, for example to investigate more thoroughly the effect of ice meltwater on climate system evolution, and to examine the uncertainty in other forcings. Some of these focussed simulations will target shorter durations around specific events in order to understand them in more detail and allow for the more computationally expensive models to take part.