Seasonal And Interannual Variation Of Temperature And Salt In The Blackwater Export Area Of ​​the East China Sea In 1945 And Its Influencing Factors

Climate change and its impact is one of the most concern to the international community, the ocean is a part of the climate system, and plays a key role in the energy balance and material balance of the climate system in. Seawater temperature is an important parameter of the reaction of ocean water heat balance, the salinity is the basic element of characterization of physical oceanography, chemical characteristics, but also reflect the characteristics of one of the important indicators of marine hydrology and climate, and changes in ocean salinity can be a good indicator of local and global hydrologic cycle. The Kuroshio is an important factor affecting the offshore of China and East Asia climate environment, the Kuroshio in the East China Sea outlet area, refers to the Kuroshio in the East China Sea outflow from the middle of the Tokara Strait sea returned to the Pacific region, Tokara Strait is one of the key channels on the Kuroshio path. Discussion of the Kuroshio in the East China Sea region temperature, salt export season \ interannual and spatial variability of the Kuroshio in the East China Sea region, Northwest Pacific water masses and interaction, to lay the foundation for the thorough understanding of Kuroshio effects on the climate change of china.In this paper, the use of East Asian regional ocean temperature and salinity data set Ishii(1945-2010), the construction of the Kuroshio in the East China Sea Temperature and salinity database export zone, by extracting the thermohaline characteristics exit area value, hierarchical analysis of seasonal interannual variation of the Kuroshio in the East China Sea, export zone 0-700 m 1945-2010 annual temperature salt. The results showed that:1)the trends of 0-700 m temperature at the outlet of the Kuroshio in the East China Sea area is divided into three layers: 20 C and 17 C isotherm section divided into 300 m to shallow feature layer, this layer fluctuates greatly, the overall depth of variable depth trend; 300-450 m layer to draw 14 C isotherm, the fluctuation range of gentle; at 11 C isotherm of 400-500 m layer the emergence of isotherms rise phenomenon, and the depth is deeper, the greater the amplitude of fluctuation. Data from eight point analysis 500-700 m temperatures it is known that in general, 500-700 m temperature interannual variability present cooling trend, change and 0-500 m layer temperature of this trend is not consistent; temperature interannual variation range from 500-700 m but appeared from shallow to deep gently to temperature changes strongly change, and temperature of the 500 m layer is also a rising trend, 600 m and 700 m are cool.2)of the Kuroshio in the East China Sea export zone temperature mutation analysis obtained the mutation point year, year is concentrated, there are more 1970-1980 mutations in five years, the temperature change trend and mutation section is similar to the temperature increase year, mostly from the beginning of the 60’s, 90’s warming phenomenon significantly; and from the month can be seen, in the four months of selection, eleven temperature M-K analysis of more than 0.05 significant critical values of the amplitude maximum, that the warming trend is strongest in November.4) The periodic variation analysis section 2-5 years, 5-7 years and 9-11 years are the three main periodic temperature variation; selected four typical month had different cycle, seasonal is not obvious; the data can be judged according to 2-5 years cycle is mainly affected by ENSO induced, 5-7 years and 9-11 years cycle basis for further the study, preliminary consideration 9-11 year cycle and sunspot movement related.5)The Kuroshio in the East China Sea export zone 0-700 m salinity interannual variation is divided into three layers: the 0-300 m layer results of each section of salinity generally showed decreasing trend in 66 years, Section A and section B wave amplitude with respect to section TK, Section C and D small 300-500 m layer on the whole; main upward trend, this and the 0-300 m layer on the contrary; salinity fluctuation the relatively large 0-300 m layer and 0-300 m layer; appear "W ’type is different, the 300-500 m layer salinity appeared in" M’ type change, but the two have 1980 as the boundary; 500-700 m layer 66 years salinity interannual variation trend is from shallow to deep in down up down state; salinity fluctuation. Are small, and the 0-300 m layer is strongly consistent, fluctuation is mainly in autumn and winter, spring and summer fluctuation.6)The Kuroshio in the East China Sea area of each section of export 0-700 m layer 66 years average periodic variation of salinity is consistent, and the results and analysis of temperature is close to: 5 years, 7-9 years and 11-13 years is the three main cycles of salinity in the past 66 years change can be judged; according to the data of 2-5 year cycle is mainly affected by ENSO the influence caused by, 5 years and 7-9 years cycle on the basis of further study, also preliminary consideration 11 year cycle and sunspot movement related.7)By using the same method of the Kuroshio in the East China Sea area of each section and export data points 0-700 m layer 66 years of temperature, salinity variation, mutation, year periodic variation of temperature and salinity, can be found the following: 1) the similarities and differences between the same 66 years export area of the inter annual change of temperature salinity 0-700 m layer is divided into three layer 0-300m\300-500m\500-700m; 2 the temperature and salinity) mutation year consistent; 3) thermohaline change cycle appeared 5 years, 9-11 years cycle; similarities and differences: changes in the surface temperature of the three layer, significant warming phenomenon; salinity increase phenomenon is concentrated in the 300-500 m layer.