THE ARCTIC SYSTEM REANALYSIS, VERSION 2
THE ARCTIC SYSTEM REANALYSIS, VERSION 2
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DOI：
10.1175/bams-d-16-0215.1
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发表时间：
2018-04-01
影响因子：
8
通讯作者：
Walsh, J. E.
中科院分区：
文献类型：
--
作者：
Bromwich, D. H.;Wilson, A. B.;Walsh, J. E.
北极是全球气候的重要组成部分，其快速的环境演变是世界气候变化的重要因素。为了检测和诊断北极气候系统的变化，必须进行最先进的综合评估和监测。本文介绍了北极系统再分析，第2版（ASRv 2），多机构，大学主导的回顾性分析（再分析）的大北极地区使用混合的极地优化版本的天气研究和预报（极地WRF）模型和WRF三维变分数据同化观测的区域气候的北极2000年至2012年的综合一体化。与第1版（ASRv 1）相比，ASRv 2的新功能包括：1）空间分辨率更高（水平分辨率为15公里），2）更新模型物理，包括次网格尺度云分数与辐射的相互作用，以及3）更准确的数据同化的双外循环例程。美国国家大气研究中心（NCAR）提供的ASRv 2表面和压力水平产品具有3小时和月平均时间尺度。ASRv 2的分析揭示了近地面和对流层变量的上级再现。大尺度分析的预测降水和特定地点的向下辐射通量的比较表明，ASRv 1显着改善。高分辨率的地形和陆地表面，包括每周更新的植被和现实的海冰分数，海冰厚度和海冰上的积雪深度，解决精细尺度的过程，如地形强迫风。因此，ASRv 2允许重建自21世纪初以来北极的快速变化-补充全球再分析。ASRv 2产品将有助于环境模型、区域过程的验证或未来观测网络的选址。
The Arctic is a vital component of the global climate, and its rapid environmental evolution is an important element of climate change around the world. To detect and diagnose the changes occurring to the coupled Arctic climate system, a state-of-the-art synthesis for assessment and monitoring is imperative. This paper presents the Arctic System Reanalysis, version 2 (ASRv2), a multiagency, university-led retrospective analysis (reanalysis) of the greater Arctic region using blends of the polar-optimized version of the Weather Research and Forecasting (Polar WRF) Model and WRF three-dimensional variational data assimilated observations for a comprehensive integration of the regional climate of the Arctic for 2000–12. New features in ASRv2 compared to version 1 (ASRv1) include 1) higher-resolution depiction in space (15-km horizontal resolution), 2) updated model physics including subgrid-scale cloud fraction interaction with radiation, and 3) a dual outer-loop routine for more accurate data assimilation. ASRv2 surface and pressure-level products are available at 3-hourly and monthly mean time scales at the National Center for Atmospheric Research (NCAR). Analysis of ASRv2 reveals superior reproduction of near-surface and tropospheric variables. Broadscale analysis of forecast precipitation and site-specific comparisons of downward radiative fluxes demonstrate significant improvement over ASRv1. The high-resolution topography and land surface, including weekly updated vegetation and realistic sea ice fraction, sea ice thickness, and snow-cover depth on sea ice, resolve finescale processes such as topographically forced winds. Thus, ASRv2 permits a reconstruction of the rapid change in the Arctic since the beginning of the twenty-first century–complementing global reanalyses. ASRv2 products will be useful for environmental models, verification of regional processes, or siting of future observation networks.