The interactions between soil-biosphere-atmosphere land surface model with a multi-energy balance (ISBA-MEB) option in SURFEXv8-Part 1: Model description
The interactions between soil-biosphere-atmosphere land surface model with a multi-energy balance (ISBA-MEB) option in SURFEXv8-Part 1: Model description
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DOI：
10.5194/gmd-10-843-2017
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发表时间：
2017-02-21
影响因子：
5.1
通讯作者：
Decharme, Bertrand
中科院分区：
文献类型：
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作者：
Boone, Aaron;Samuelsson, Patrick;Decharme, Bertrand
由于地方尺度的观测数量不断增加，卫星数据集和最佳利用此类数据的相关方法不断改进，计算资源得到改善，并对用户群体作出了回应，陆地表面模型正朝着更加真实的方向发展。作为LSM发展趋势的一部分，人们一直在努力改进外部化表面（SURFEX）模式平台内土壤-生物圈-大气（ISBA）LSM之间相互作用的陆面过程的代表性。近年来，ISBA中的强制恢复方法已被用于次表层传热、土壤水文过程和复合积雪的多层显式物理选项所取代。近年来，SURFEX对植被过程的描述也变得更加复杂，包括光合作用、呼吸作用和生物化学过程。很明显，国际土壤-植被管理局内的土壤-植被综合计划已经达到了概念上的极限，需要明确地将冠层植被与土壤表面分开。针对这一问题，2008年开始在高分辨率有限区域模型（HIRLAM）联合体和法国气象局之间开展合作，目的是在SURFEX平台下在ISBA中开发植被的明确表示。为了解决这些问题，已经开发了一种称为ISBA多能量平衡的新参数化。ISBA-MEB包括在一个完全隐式的数值耦合之间的多层物理积雪模型，一个可变层土壤计划，一个明确的凋落物层，散装植被计划，和大气。它还包括一个功能，允许耦合过渡的积雪从冠层空气的自由大气。它与ISBA的标准版本共享许多例程和物理参数化。本文是两部分的第一部分，第一部分介绍了ISBA-MEB模式方程、数值格式和理论背景。在第二部分（Napoly等人，2016年），这是一个单独的配套文件，提出了新方案的地方规模的评估沿着与新的森林凋落物计划的详细说明。
Land surface models (LSMs) are pushing towards improved realism owing to an increasing number of observations at the local scale, constantly improving satellite data sets and the associated methodologies to best exploit such data, improved computing resources, and in response to the user community. As a part of the trend in LSM development, there have been ongoing efforts to improve the representation of the land surface processes in the interactions between the soil-biosphere-atmosphere (ISBA) LSM within the EXternalized SURFace (SURFEX) model platform. The force-restore approach in ISBA has been replaced in recent years by multi-layer explicit physically based options for sub-surface heat transfer, soil hydrological processes, and the composite snowpack. The representation of vegetation processes in SURFEX has also become much more sophisticated in recent years, including photosynthesis and respiration and biochemical processes. It became clear that the conceptual limits of the composite soil-vegetation scheme within ISBA had been reached and there was a need to explicitly separate the canopy vegetation from the soil surface. In response to this issue, a collaboration began in 2008 between the high-resolution limited area model (HIRLAM) consortium and Meteo-France with the intention to develop an explicit representation of the vegetation in ISBA under the SURFEX platform. A new parameterization has been developed called the ISBA multi-energy balance (MEB) in order to address these issues. ISBA-MEB consists in a fully implicit numerical coupling between a multi-layer physically based snow-pack model, a variable-layer soil scheme, an explicit litter layer, a bulk vegetation scheme, and the atmosphere. It also includes a feature that permits a coupling transition of the snowpack from the canopy air to the free atmosphere. It shares many of the routines and physics parameterizations with the standard version of ISBA. This paper is the first of two parts; in part one, the ISBA-MEB model equations, numerical schemes, and theoretical background are presented. In part two (Napoly et al., 2016), which is a separate companion paper, a local scale evaluation of the new scheme is presented along with a detailed description of the new forest litter scheme.