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arXiv 1601.04730physics.ao-ph
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从多个initial condition和多模式集合描述气候可预报性和模式响应变率

Characterizing climate predictability and model response variability from multiple initial condition and multi-model ensembles

Devashish Kumar, Auroop R. Ganguly

摘要:

气候模式被认为是解决边界值问题,不像数值天气预报,这是一个初始值问题。然而,气候内部变率(CIV)被认为是相对重要的,在近期(0-30年)的预测范围内,特别是在较高的分辨率。最近大量的多模型(MME)和多初始条件(MICE)合奏的可用性允许第一次直接灵敏度分析CIV与模型响应变异性(MRV)。了解MME和MICE集合在多个区域、分辨率和预测范围内的相对一致性和可变性对于关注模型改进、诊断和预测以及影响、适应和脆弱性研究至关重要。在这里,我们发现,CIV(MICE协议)是低于(高于)比MRV(MME协议)在所有的空间分辨率和投影时间范围的温度和降水。然而,在高纬度地区和特定地区,CIV占主导地位。此外,在所有水平和投影尺度和季节,CIV比MRV大得多的降水温度相比。降水表现出较大的不确定性,急剧衰减的MICE协议相比,MME,和相对较大的优势,在较高的纬度CIV MRV。这些发现对于气候可预测性和与气候变化相关的适应战略至关重要。

英文摘要:

Climate models are thought to solve boundary value problems unlike numerical weather prediction, which is an initial value problem. However, climate internal variability (CIV) is thought to be relatively important at near-term (0-30 year) prediction horizons, especially at higher resolutions. The recent availability of significant numbers of multi-model (MME) and multi-initial condition (MICE) ensembles allows for the first time a direct sensitivity analysis of CIV versus model response variability (MRV). Understanding the relative agreement and variability of MME and MICE ensembles for multiple regions, resolutions, and projection horizons is critical for focusing model improvements, diagnostics, and prognosis, as well as impacts, adaptation, and vulnerability studies. Here we find that CIV (MICE agreement) is lower (higher) than MRV (MME agreement) across all spatial resolutions and projection time horizons for both temperature and precipitation. However, CIV dominates MRV over higher latitudes generally and in specific regions. Furthermore, CIV is considerably larger than MRV for precipitation compared to temperature across all horizontal and projection scales and seasons. Precipitation exhibits larger uncertainties, sharper decay of MICE agreement compared to MME, and relatively greater dominance of CIV over MRV at higher latitudes. The findings are crucial for climate predictability and adaptation strategies at stakeholder-relevant scales.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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