The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2)
The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2)
复制标题
DOI：
10.1175/jcli-d-16-0758.1
复制
发表时间：
2017-07-01
影响因子：
4.9
通讯作者：
Zhao, Bin
中科院分区：
文献类型：
--
作者：
Gelaro, Ronald;McCarty, Will;Zhao, Bin
现代研究与应用回顾性分析第二版（MERRA - 2）是美国国家航空航天局（NASA）全球建模与同化办公室（GMAO）制作的现代卫星时代最新的大气再分析资料。MERRA - 2同化了其前身MERRA无法获取的观测类型，并对戈达德地球观测系统（GEOS）模型和分析方案进行了更新，以便在MERRA结束后提供可行的持续气候分析。在解决MERRA已知局限性的同时，MERRA - 2也旨在成为GMAO目前正在开发的未来综合地球系统分析（IESA）的一个发展里程碑。本文概述了MERRA - 2系统以及各种性能指标。MERRA - 2中与IESA相关的进展包括气溶胶观测的同化、对平流层（包括臭氧）表示的若干改进以及对冰冻圈过程更好的表示。与MERRA相比，MERRA - 2质量的其他改进包括减少了一些与观测系统变化相关的虚假趋势和跳跃，以及水循环各方面偏差和不平衡的减少。同时也指出了仍然存在的不足。MERRA - 2于2014年6月在四个处理流程中开始制作，并于2015年年中合并为一个近实时流程。MERRA - 2产品可通过美国国家航空航天局戈达德地球科学数据信息服务中心（GES DISC）在线获取。
The Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2), is the latest atmospheric reanalysis of the modern satellite era produced by NASA's Global Modeling and Assimilation Office (GMAO). MERRA-2 assimilates observation types not available to its predecessor, MERRA, and includes updates to the Goddard Earth Observing System(GEOS) model and analysis scheme so as to provide a viable ongoing climate analysis beyond MERRA's terminus. While addressing known limitations of MERRA, MERRA-2 is also intended to be a development milestone for a future integrated Earth system analysis (IESA) currently under development at GMAO. This paper provides an overview of the MERRA-2 system and various performance metrics. Among the advances in MERRA-2 relevant to IESA are the assimilation of aerosol observations, several improvements to the representation of the stratosphere including ozone, and improved representations of cryospheric processes. Other improvements in the quality of MERRA-2 compared with MERRA include the reduction of some spurious trends and jumps related to changes in the observing system and reduced biases and imbalances in aspects of the water cycle. Remaining deficiencies are also identified. Production of MERRA-2 began in June 2014 in four processing streams and converged to a single near-real-time stream in mid-2015. MERRA-2 products are accessible online through the NASA Goddard Earth Sciences Data Information Services Center (GES DISC).