Analysis Of The Characteristics Of Sea Temperature Changes In The East China Sea And The Adjacent Northwest Pacific In The Past 140 Years

Climate change has become the most important environmental issue in today's society.The East China Sea and the adjacent Northwest Pacific not only has great impact on China's climate,but also is hot topic the international hot spots in recent years.Since sea water temperature of each layer influences each other,ocean is able to transfer heat to the atmosphere through the air-sea heat exchange,drive atmospheric movement through thermal variations,affect the atmospheric circulation and thus affect the climate change.Therefore,by using the SODA(Simple Ocean Data Assimilation)ocean reanalysis data sets,the thesis mainly study the temperature structure of the East China Sea and the djacent northwest Pacific Ocean during the latest climate reference period(1981.1-2010.12)and the characterists of the long-term scale(140 years)climate change process.This study hopes to provide a basis for further understanding of the impact of the East China Sea and the adjacent Northwest Pacific on China's climate change.The results showed that in the study area:1)From 1981 to 2010,the structural characteristics of the surface temperature are as follows: in the East China Sea continental shelf,the monthly average temperature is increasing from the continental shelf to the southeast,the isotherm is dense,the temperature range is 17-25.5 ° C,reaching the maximum temperature at the Okinawa Trough.In the Kuroshio area of the East China Sea,due to the flow of the Kuroshio in the East China Sea,the temperature continued to rise,and some of the high temperature water tongues extended to the Kuroshio extension by the Kuraray Monastery and the other part extending to the northeastern direction.In the northwest Pacific region,the monthly mean temperature decreases from low latitudes to high latitudes,and the temperature range is 27-24 ° C.The isotherms travel roughly parallel to the latitudes and the isotherms are sparse.The average temperature in the East China Sea is lower than that in the northwest Pacific,while the temperature gradient in the East China Sea is greater than that in the Northwest Pacific.The temperature structure of the East China Sea continental shelf is mainly affected by the terrain.The temperature structure of the Kuroshio in the East China Sea is mainly affected by ocean currents.The temperature structure of the Northwest Pacific is mainly affected by the latitude position.2)In the new climate reference period,the monthly variation of the surface temperature in 1-12 months is characterized by obvious seasonal variation.The low temperature area in 1-3 months is mainly affected by the coastal waters of the East China Sea continental shelf(February),in 7-9 months the temperature in the whole sea area is generally high,and the temperature of the whole area is mainly affected by the temperature in the northern part of the Yangtze River.Solar radiation,the East China Sea Kuroshio and river run off;10-12 months the temperature began to decline,the northern coastal waters began to appear(December).3)The temperature difference is very large,the temperature difference is-7 ~ 0 ° C,the temperature difference between the Okinawa Trough is very small;the temperature difference of the Okinawa Trough is very small.In the Kuroshio area of the East China Sea,due to the high temperature of the East China Sea Kuroshio flow,the temperature range of 0 ~ 2° C;in the Northwest Pacific region,the temperature difference between the latitude position,isothermal line sparse,temperature range of 0 ~ 3 ° C.According to the temperature difference between 0 ° C and 2 ° C,the study area can be divided into five climatic zones: the East China Sea continental shelf,the East China Sea Kuroshio area,the northwest Pacific Ocean,the northwest Pacific Ocean and the southwest of Taiwan.4)30 years of deep changes in the characteristics of the performance: as the depth of the deepening of the overall temperature is down.The Kuroshio wave in the East China Sea can only affect the depth of 171 m.From the 381 m depth layer,the temperature of the northwest Pacific rises with the increase of the latitude,and the temperature change is not affected by the solar radiation.5)140 years of temperature characteristics of the performance: high temperature center with the Okinawa Trough(East China Sea Kuroshio)direction to the northwest extension to the horse warm current,the other part of the extension to the Beng Kala Strait for the Kuroshio extension,in the On the eastern side of the strait,the sub-high temperature center,the middle sea water to the East China Sea continental shelf.Kuroshio flows from the east coast of Taiwan to the East China Sea,flowing roughly along the slope to the northeast,accompanied by an invasion of the East China Sea continental shelf.Kuroshio invasion mainly manifested as Kuroshio sub-surface water surge.6)From the surface to the depth,140 years of temperature characteristics of the performance: the temperature from the surface to the deep decline,the middle of the temperature change is not uniform,especially 15-20° C temperature change significantly,with the longitude east The temperature of the maximum depth of 200 ~ 500 m,divided into three distinct layers,the temperature is more stable in the bottom.7)In the past 25 years,the temperature change from the surface to the 100 m layer is the largest in the East China Sea and the adjacent northwest Pacific.With the deepening of the depth,the temperature change rate of the other 25 years is not the largest.The depth of the temperature began to decline with the East China Sea continental shelf to the northwest Pacific transition and slowly deepened.