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我在哪里可以找到CMIP6元数据中不同变体id的详细描述?

我在哪里可以找到不同的文件VARIANT-IDs的CMIP6数据集?VARIANT-ID的格式如下l r k > <我< > p > < m f < n >，其中的字符r，我，p而且f表示:

r-realisation
i-initialisation方法
p-physics
f-forcing

我检查了概述论文Eyring等人(2016)，但它没有提到任何关于VARIANT-ID的内容。所提供的其他文件我也核对了ESGF，但没有找到任何信息。

有人知道我在哪里可以找到详细的信息吗VARIANT-IDCMIP6数据集?

回答

variant_labels在[CMIP6数据参考语法(DRS)][1]文档中定义，由realization_index、initialization_index、physics_index和forcing_index组成。例如，可以在[CMIP6建模者参与指南][2]中找到该DRS文档的链接。编辑:根据Deditos的评论，我引用下面DRS文档的相应部分:>对于给定的实验，realization_index、initialization_index、> physics_index和forcing_index用于唯一地标识由单个模型贡献的运行集合的每个>模拟。这些指标定义如下:> - realization_index =一个整数(≥1)，用于区分仅在初始条件上不同的模拟集合成员(例如，从控制运行中的不同点初始化)。请注意，如果两个不同的模拟是从相同的初始条件开始的，那么两个模拟应该使用相同的实现号。例如，如果一个只有“自然强迫”的历史运行和另一个包含人为强迫的历史运行都是在控制运行的同一点生成的，那么两者都应该被分配相同的实现。此外，每个所谓的RCP(未来场景)模拟通常应该被分配与启动它的历史运行相同的实现整数。这将允许用户轻松地将适当的历史运行和未来运行拼接在一起。> - initialization_index =整数(≥1)，除了区分在相同条件下执行但初始化过程不同的模拟外，应该为其赋值1。在CMIP6中，除DCPP活动所要求的一些后续和预测实验外，该指数应始终赋值为“1”。 The initialization_index can be used either to distinguish between different algorithms used to impose initial conditions on a forecast or to distinguish between different observational datasets used to initialize a forecast. > - physics_index = an integer (≥1) identifying the physics version used by the model. In the usual case of a single physics version of a model, this argument should normally be assigned the value 1, but it is essential that a consistent assignment of physics_index be used across all simulations performed by a particular model. Use of “physics_index” is reserved for closely-related model versions (e.g., as in a “perturbed physics” ensemble) or for the same model run with slightly different parameterizations (e.g., of cloud physics). Model versions that are substantially different from one another should be given a different source_id” (rather than simply assigning a different value of the physics_index). > - forcing_index = an integer (≥1) used to distinguish runs conforming to the protocol of a single CMIP6 experiment, but with different variants of forcing applied. One can, for example, distinguish between two historical simulations, one forced with the CMIP6-recommended forcing data sets and another forced by a different dataset, which might yield information about how forcing uncertainty affects the simulation. > Each data provider can assign whatever positive integers they like > for the realization_index, intialization_index, physics_index, and > forcing index. For each source/experiment pair, however, consistency > (in these indices) should be maintained across each parent/child pair > whenever sensible (so that, for example, both the ScenarioMIP child > and its “historical” parent simulation would be assigned the same set > of index values for realization, initialization, and physics); the > integer 1 should normally be chosen for each of these in the case of a > single variant or for the primary variant (if there is one). This is > only a suggestion, however; there should be no expectation on the part > of users that every model will have a value of 1 assigned to any of > the r, i, p, f indices, and even if a 1 is assigned it does not imply > that it is the primary variant. Note also that a child spawned by a > control run will not necessarily have the same “ripf” value as the > control, since, for example, multiple realizations of an experiment > will branch from the same control. > > Note that none of the “ripf” indices can be omitted. > > Example of a variant_label: if realization_index=2, > initialization_index=1, physics_index=3, and forcing_index=233, then > variant_label = “r2i1p3f233”. [1]: https://docs.google.com/document/d/1h0r8RZr_f3-8egBMMh7aqLwy3snpD6_MrDz1q8n5XUk/edit [2]: https://pcmdi.llnl.gov/CMIP6/Guide/modelers.html

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2

\ begingroup美元你好。这几乎是一个只有链接的答案，CMIP有一点链接腐烂的历史，所以在这里引用DRS谷歌文档中的所有注释8将是有用的。 \ endgroup美元
- - - - - -Deditos
2022年7月12日9:53

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纠正小的拼写错误
阐明意思而不改变它
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使用反撇号'或波浪号~创建代码围栏
' ' '
像这样
' ' '
添加语言标识符以突出显示代码
”“python
def函数(foo):
打印(foo)
' ' '
在段落之间放置返回
对于换行符，末尾加2个空格
_italic_或* *的* *
通过将>放在行开始来引用
要建立链接(尽可能使用HTTPS)
< https://example.com >
(例子)(https://example.com)
< a href = " https://example.com " > < / >示例
MathJax方程罪\ \ ^ 2θ美元

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