Discrepancies between Different Northern Hemisphere Summer Atmospheric Data Products
Discrepancies between Different Northern Hemisphere Summer Atmospheric Data Products
复制标题
DOI：
10.1175/jcli3643.1
复制
发表时间：
2006-04
影响因子：
4.9
通讯作者：
R. Greatbatch;P. Rong
中科院分区：
文献类型：
--
作者：
R. Greatbatch;P. Rong
摘要 将 NCEP-NCAR 和 ECMWF 40 年重新分析 (ERA-40) 重新分析的北半球夏季（7 月至 8 月）数据相互进行比较，并与 Trenberth 的海平面压力 (SLP) 数据集进行比较。 SLP 和 500 hPa 的差异主要局限于连接北非和亚洲的频段。在 NCEP-NCAR 再分析中，1960 年代末之前北非和亚洲的海平面气压存在负偏移，500 hPa 高度也存在类似问题，而在 Trenberth 的数据中，1990 年代初之前亚洲的海平面气压存在负偏移。这两种抵消都放大了 NCEP-NCAR 和 Trenberth 数据集中 1958 年至 2002 年北非和亚洲的线性趋势。另一方面，在这些偏移量之间的时期内，三个数据集的年际变化高度相关。与海平面气压和 500 hPa 高度相比，2 米气温差异范围更广，从北非向东穿过亚热带进入太平洋，并增加了...
Abstract Northern Hemisphere summer (July–August) data from the NCEP–NCAR and ECMWF 40-yr Re-Analysis (ERA-40) reanalyses are compared with each other and with Trenberth's sea level pressure (SLP) dataset. Discrepancies in SLP and 500 hPa are mostly confined to a band connecting North Africa and Asia. In the NCEP–NCAR reanalysis, there is a negative offset in SLP over North Africa and Asia prior to the late 1960s, together with a similar problem in 500-hPa height, and in Trenberth's data there is a negative offset in SLP over Asia prior to the early 1990s. Both these offsets magnify the linear trend from 1958 to 2002 over North Africa and Asia in the NCEP–NCAR and Trenberth datasets. On the other hand, the interannual variability in the three datasets is highly correlated during the periods between these offsets. Compared to SLP and 500-hPa height, there is a more extensive area of discrepancy in 2-m temperature that extends eastward from North Africa across the subtropics into the Pacific, with an additi...