Land-atmosphere coupling in EURO-CORDEX evaluation experiments
Land-atmosphere coupling in EURO-CORDEX evaluation experiments
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DOI：
10.1002/2016jd025476
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发表时间：
2017-01-01
影响因子：
4.4
通讯作者：
Simmer, Clemens
中科院分区：
文献类型：
--
作者：
Knist, Sebastian;Goergen, Klaus;Simmer, Clemens
陆地表面和大气之间的相互作用在天气和气候系统中发挥着重要作用。在这里，我们对 ERA-Interim 驱动的欧洲域协调区域气候降尺度实验 (EURO-CORDEX) 模型集合 (1989-2008) 的子集中发现的夏季陆地-大气耦合强度进行了比较。大多数区域气候模型 (RCM) 再现了全球土地蒸发阿姆斯特丹观测模型 (GLEAM) 和 FLUXNET 数据集所建议的不同欧洲气候区的总体土壤湿度年际变化、空间模式和地表交换通量的年周期。然而，一些 RCM 与某些地区的 FLUXNET 观察结果存在很大差异。耦合强度通过表面感热通量与潜热通量之间的相关性以及潜热通量与 2m 温度之间的相关性来量化。第一个相关性与少数可用的长期欧洲高质量 FLUXNET 观测结果的估计值进行比较，后者与网格化 GLEAM 数据的结果进行比较。 RCM模拟与南欧强耦合和北欧弱耦合的大尺度模式下的观测数据集一致。然而，在覆盖中欧大部分地区的从强耦合到弱耦合的过渡区域，与 FLUXNET 和 GLEAM 相比，许多 RCM 往往会高估耦合强度。 RCM 集合扩散主要是由应用的不同陆地表面模型以及不同大气参数化产生的模型特定天气条件引起的。
Interactions between the land surface and the atmosphere play a fundamental role in the weather and climate system. Here we present a comparison of summertime land-atmosphere coupling strength found in a subset of the ERA-Interim-driven European domain Coordinated Regional Climate Downscaling Experiment (EURO-CORDEX) model ensemble (1989-2008). Most of the regional climate models (RCMs) reproduce the overall soil moisture interannual variability, spatial patterns, and annual cycles of surface exchange fluxes for the different European climate zones suggested by the observational Global Land Evaporation Amsterdam Model (GLEAM) and FLUXNET data sets. However, some RCMs differ substantially from FLUXNET observations for some regions. The coupling strength is quantified by the correlation between the surface sensible and the latent heat flux, and by the correlation between the latent heat flux and 2m temperature. The first correlation is compared to its estimate from the few available long-term European high-quality FLUXNET observations, and the latter to results from gridded GLEAM data. The RCM simulations agree with both observational datasets in the large-scale pattern characterized by strong coupling in southern Europe and weak coupling in northern Europe. However, in the transition zone from strong to weak coupling covering large parts of central Europe many of the RCMs tend to overestimate the coupling strength in comparison to both FLUXNET and GLEAM. The RCM ensemble spread is caused primarily by the different land surface models applied, and by the model-specific weather conditions resulting from different atmospheric parameterizations.