NCEP North American Regional Reanalysis (NARR)

The NCEP North American Regional Reanalysis products are on the Eta 221 grid at 29 pressure levels. They were produced using the Eta 32 km model with 45 vertical layers. The input data includes all observations used in NCEP/NCAR Global Reanalysis project, and additional precipitation data, TOVS 1B radiances, profiler data, land surface and moisture data, etc. The output analyses are 3-hourly with additional 9 variables in the 3-hour forecasts to reflect accumulations or averages.

NARR reruns from 20090311 to 20091214 are updated on February 4, 2010. In April 2015, NCEP has released rerun 4 [http://rda.ucar.edu/datasets/ds608.0/docs/rr4.pdf] from April 1, 2009 to January 31, 2015 to fix codes and Mexico precipitation data preparation.

See NCEP's NARR Frequently Asked Questions [http://www.emc.ncep.noaa.gov/mmb/rreanl/faq.html]

NCEP北美区域再分析产品位于Eta 221网格，包含29个压力层级。这些产品是基于Eta 32公里分辨率模型，并具有45层垂直结构的模型生成。输入数据涵盖了NCEP/NCAR全球再分析项目中使用的所有观测数据，以及额外的降水数据、TOVS 1B辐射亮度数据、探空数据、地表和湿度数据等。输出分析结果以3小时为周期，并在3小时预报中增加了9个变量，以反映累积值或平均值。
NARR从20090311至20091214的再分析结果于2010年2月4日进行了更新。2015年4月，NCEP发布了从2009年4月1日至2015年1月31日的第4次再分析版本[http://rda.ucar.edu/datasets/ds608.0/docs/rr4.pdf]，以修正代码并准备墨西哥的降水数据。
请参阅NCEP的NARR常见问题解答[http://www.emc.ncep.noaa.gov/mmb/rreanl/faq.html]