Climate change: Daily minimum temperature projections, daily data, RCP2.6 scenario, resolution 0.125°
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The database contains a time series of daily climate projections of the daily lowest air temperature in the period 1981-2100 for the scenario of greenhouse gas emissions RCP2.6 above Slovenia in the correct grid, resolution 0.125°. For RCP2.6, simulations of two regional climate models are available. The simulations are the result of regional models of the EURO-CORDEX project. Their resolution is 0.11°. The data are corrected according to measurements in Slovenia in the period 1981-2010 (the so-called bias correction). Find out more about the EURO-CORDEX project through additional links. The data is in NetCDF format files, which are divided into 30-year periods due to their size. There are four files available for each model. Each 30-year period is marked with the year of the last year of the period. Model projection files have names that contain information about the name of the variable, models, projection time, version, etc. separated by underscores. The components of the names are: name of variable (tasmin: daily minimum air temperature), model resolution (12 km: 0.125°), the name of the global climate model that gave marginal conditions to the regional, abbreviated greenhouse gas emissions scenario (rcp26: RCP2.6), ensemble parameters (e.g. r1i1p1), regional climate model name, projection version, projection time step (day: 1 day) and start and end dates of the projection (as YYYYMMDD where YYYY is year, MM month and DD day). The model results represent the physically possible states of the climate system in the future relative to the day, which in this case is the path of greenhouse gas concentration. As greenhouse gas concentrations cannot be predicted, the International Panel on Climate Change (IPCC) in its fifth report from 2014 produced four plausible scenarios for it, given the socio-economic evolution of humanity in the future. Since model results differ from one another and each of them represents a possible state of the climate, their results must be statistically processed. The differences between them form the basis for assessing the uncertainty of the projections. A summary of analyses of climate change by the end of the century in Slovenia can be found among additional links. There is also the first synthesis report on climate change in Slovenia, which contains a more detailed description of the methodology and results of climate projections. About climate projections are discussed in Chapter 1, on regional climate models, Chapter 3.2, and on the correction of errors or bias of models Chapter 4.3. One of the options for working with NetCDF files (extraction, aggregation, etc.) is the CDO program. Reading and statistical processing on NetCDF files are also possible with the statistical package R, especially its ncdf4 and raster packages. Links to CDO and R programs can be found in additional links.
本数据集包含1981年至2100年间,针对温室气体排放情景RCP2.6下斯洛文尼亚区域的逐日最低气温时序气候预测数据,采用精度为0.125°的标准格网组织。 针对RCP2.6情景,本数据集提供两套区域气候模式的模拟结果。这些模拟结果源自EURO-CORDEX计划下的区域气候模式,其分辨率为0.11°。数据已依据1981-2010年斯洛文尼亚本土观测数据进行偏差校正(bias correction)。可通过附加链接了解EURO-CORDEX计划的更多详情。 数据集采用NetCDF格式存储,因文件体量较大,按30年时段进行拆分。每套模式对应4个数据文件,每个30年时段以该时段的结束年份作为标识。 模式预测文件的文件名以下划线分隔的字段包含变量名、模式、预测时段、版本等信息。文件名各组成部分依次为:变量名(tasmin:逐日最低气温)、模式分辨率(12 km:0.125°)、为区域模式提供边界条件的全球气候模式名称、温室气体排放情景缩写(rcp26:RCP2.6)、集合参数(例如r1i1p1)、区域气候模式名称、预测版本、预测时间步长(day:1天)以及预测起止日期(格式为YYYYMMDD,其中YYYY代表年份、MM代表月份、DD代表日期)。 模式模拟结果表征了相对于温室气体浓度路径的未来气候系统的物理可能状态。由于温室气体浓度无法精准预测,政府间气候变化专门委员会(Intergovernmental Panel on Climate Change, IPCC)在2014年发布的第五次评估报告中,结合人类未来社会经济发展路径,提出了四种合理的排放情景。由于不同模式的模拟结果存在差异,且每套结果仅代表气候系统的一种可能状态,因此需对模拟结果开展统计处理。模式间的差异是评估预测不确定性的核心依据。关于斯洛文尼亚至本世纪末的气候变化分析总结,可通过附加链接获取。此外还有斯洛文尼亚首份气候变化综合报告,其中详细阐述了气候预测的方法学与研究结果:气候预测相关讨论见于第1章,区域气候模式相关内容见于第3.2节,模式误差(偏差)校正相关内容见于第4.3节。 处理NetCDF文件(如数据提取、聚合等)的常用工具之一为CDO程序。亦可通过统计软件包R及其ncdf4、raster扩展包完成NetCDF文件的读取与统计分析。CDO与R程序的相关链接可在附加链接中获取。



