Japanese Reanalysis for Three Quarters of a Century (JRA-3Q)

JMA is currently conducting the Japanese Reanalysis for Three Quarters of a Century (JRA-3Q), which covers the period from September 1947 onward to extend the current period of data coverage and improve the quality of long-term reanalysis. The project involves a sophisticated data assimilation system (based on the operational set-up as of December 2018) incorporating development results from the operational NWP system and sea surface temperature analysis achieved since JRA-55 (based on the operational set-up as of December 2009). New datasets of past observations are also assimilated, including rescued historical observations and reprocessed satellite data supplied by meteorological and satellite centers worldwide. Many of the deficiencies of JRA-55 are alleviated in JRA-3Q, providing a high-quality homogeneous reanalysis dataset that covers the previous 75 years.

日本气象厅（Japan Meteorological Agency, JMA）目前正开展75年时段日本再分析数据集（Japanese Reanalysis for Three Quarters of a Century, JRA-3Q）的研发工作，该数据集的时间覆盖范围自1947年9月起，旨在拓展现有数据覆盖周期，并提升长期再分析数据的质量。本项目采用基于2018年12月业务配置的精密数据同化系统（data assimilation system），整合了自日本55年再分析数据集（JRA-55，基于2009年12月业务配置）以来研发的业务数值天气预报（Numerical Weather Prediction, NWP）系统成果与海面温度分析技术。研究团队同时对新增的历史观测数据集开展同化处理，其中涵盖全球气象与卫星机构提供的抢救性历史观测资料与再处理卫星数据。JRA-3Q弥补了JRA-55的诸多不足，可提供覆盖此前75年的高质量均一化再分析数据集。

搜集汇总

背景与挑战

背景概述

JRA-3Q是日本气象厅开发的长期气象再分析数据集，覆盖1947-2026年，整合了历史观测和卫星数据，提供全球范围多种气象变量的高质量同质化数据。数据集包含大气、地表、海洋等多维度信息，总容量473.85TB，采用netCDF4格式存储。