NCEP Daily Northern Hemisphere Tropospheric Analyses for 1973 January to 1997 March

This dataset contains twice daily gridded Northern Hemisphere analyses from NCEP's operational model on 47-by-51 and 65-by-65 polar-stereographic grids centered on the North Pole. Available parameters include geopotential height, temperature, stream functions, thickness, and vertical velocity for various levels and layers through the troposphere.

NCEP prepared the 65-by-65 analyses, and were an advancement over the 47-by-51 "B3" analyses. Later NCEP made global analyses, from which the 65-by-65 analyses were interpolated. To continue the 47-by-51 analyses, NCAR/CISL/DSS extracted them from the 65-by-65 grid.

本数据集包含来自美国国家环境预报中心（NCEP）运行模型的每日两次的格网化北半球分析，分析网格为以北极为中心的47×51和65×65极地投影网格。其中可用的参数包括位势高度、温度、流函数、厚度以及通过对流层不同层次和层级的垂直速度。美国国家环境预报中心（NCEP）制备了65×65的分析，相较于47×51的“B3”分析有所进步。随后，NCEP进行了全球分析，并将65×65的分析进行插值处理。为了延续47×51的分析，美国国家大气研究中心/大气化学与海洋学实验室/数据服务系统（NCAR/CISL/DSS）从65×65网格中提取了这些分析。