Examination of seasonal variation of the equatorial undercurrent termination in the Eastern Pacifi c diagnosed by ECCO2

Seasonal variations of the equatorial undercurrent(EUC) termination in the Eastern Pacific,and their mechanism were examined using the Estimating the Circulation and Climate of the Ocean,PhaseⅡ(ECCO2).The ECCO2 reproduced a weak and shallow eastward EUC east of the Galapagos Islands,with annual mean transport of half of EUC to the west of the Islands.The diagnosis of zonal momentum equation suggests that the zonal advection(nonlinear terms) drives the EUC beyond the Islands rather than the pressure gradient force.The EUC in the Far Eastern Pacific has the large st core velocity in boreal spring and the smallest one in boreal summer,and its volume transport exhibits two maxima in boreal spring and autumn.The seasonal variability of the EUC in the Eastern Pacific is dominated by the Kelvin and Rossby waves excited by the zonal winds anomalies in the central and Eastern Pacific that are associated with the seasonal relaxation or intensification of the trade wind.In the Far Eastern Pacific to the east of 120°W,the eastward propagation Kelvin waves play a dominate role in the seasonal cycle of the EUC,results in a semiannual fluctuation with double peaks in boreal spring and autumn.A construction of water mass budget suggests that approximately 24.1% of the EUC water east of 100°W has upwelled to the mixed layer by0.35 m/d.The estimated upwelling is stronge st during boreal autumn and weake st during boreal winter.It is also found that approximately 42.6% of the EUC turns westward to feed the south equatorial current(SEC),13.2% flows north of the equator,and 20.1% flows south of the equator,mainly contributing to Peru-Chile undercurrent.

Temporal and Spatial Distribution and Influence Systems of Spring Thunderstorms in 2013 in Sichuan Province

Based on the lightning monitoring data, automatic and routine weather station observation data in spring （March-May） of 2013 of Sichuan Province, the corresponding relationship between the spatial distribution and the different regions, and the characteristics of atmospheric circulation and evolution of influence the sys- tem were analyzed and summarized. The results show that： the lightning and thunderstorm showed great regional differences in the spring of 2013 in Sichuan Province and the thunderstorm activity period was not the same in different areas. Because of the change of atmospheric circulation, the influence system from March to May corresponding to the thunderstorms in Sichuan tended to be volatile, also.

Reform and opening up in the area of circulation:a retrospect

China＇s reform and opening up in the area of circulation are an important component of the establishment of a socialist mgrket economy system. Prior to reform and opening up, this area had long been characterized by a high level of centralization, closedness and segmentation. The domestic market was isolated from the overseas market and internal trade from foreign trade, and each had its own management system and policy environment. The thirty years of reform and opening up, however, have put a new face on the institutional environment of circulation： an open and modern system of circulation has been basically established, an embryonic WTO-consistent business administration system is taking shape, and the extension Of business and trade service ixidustries has facilitated institutional innovation. The main experience of reform is the following： first, taking opening up as the leading principle and making use of opening up to promote reform; second, following an incremental path of dealing with the easier issues before the harder ones, building up while you tear down, and gradual improvement; and third, breaking through the traditional framework of commodity circulation and establishing new business systems that accommodate more service industries. The economic implication of China＇s reform experience is as follows： an export-oriented strategy must inevitably be chosen as the point of entry for reform; there is an inherent linkage between market structure and human capital in the circulation of goods and services; and expanding the circulation of non-material goods is an important basis for institutional innovation.