The zonal structure of the Hadley circulation
The zonal structure of the Hadley circulation
复制标题
哈德利环流的纬向结构
DOI：
10.1007/s00376-006-0869-5
复制
发表时间：
2006
影响因子：
5.8
通讯作者：
P. Baines
中科院分区：
文献类型：
--
作者：
P. Baines
本文讨论了Hadley环流的物质输运及其纵向结构。从1948-2005年期间的NCEP/NCAR再分析数据集的数据进行检查，侧重于冬至季节的6月至8月和12月至2月。从数据中提取了定量估计，以观察对流层上部北/南质量输送的纬向平均值与热带降水（意味着潜热释放）和副热带高压带沉降的驱动因素之间的关系。然后检查这三个主要变量的纵向结构的流动。对流层上层极向输送有4个（JJA）或3个（DJF）主支，连接强降水区和相应的大沉降区，还有1个（6、7、8月）或2个（12、1、2月）反向支。这一结构在过去60年中保持稳定。虽然各季对流层高层输送总量小于目标副热带高压带下沉输送总量，但这并不适用于个别分支，其平衡是由对流层高层反向输送来弥补的。然而，对所有这些不同组成部分之间相互关系的分析表明，整个情况更为复杂，有些降水区与其自身分支以外的沉降区相连。
A discussion of the mass transport of the Hadley circulation is presented, with regard to its longitudinal structure. Data from the NCEP/NCAR reanalysis data set for the period 1948–2005 is examined, focusing on the solsticial seasons of June–August and December–February. Quantitative estimates have been extracted from the data to observe connections between the zonal mean of the upper tropospheric north/south mass transports and their relationship to the driving factor of tropical precipitation (implying latent heat release) and subsidence in the subtropical high pressure belts. The longitudinal structure of this flow is then examined with regard to these three main variables. The poleward upper tropospheric transport has four (JJA) or three (DJF) main branches, which link regions of major precipitation with corresponding regions of large subsidence, and one (June, July, August) or two (December, January, February) reverse branches. This structure has remained stable over the past sixty years. Although the total upper tropospheric transport in each season is less than the total sinking transport in the target subtropical high pressure belt, this does not apply to the individual branches, the balance being made up by the upper tropospheric reverse transports. An analysis of correlations between all of these various components shows, however, that the complete picture is more complex, with some precipitation regions being linked to subsidence regions outside their own branch.