The Spatial And Temporal Variations Of The SST In The South China Sea And The Adjacent Northwest Pacific From 1871 To 2010 Were Different

Climate change is one of the most important environmental problems in today's society,and the survival and development of human beings are closely related to climate change.The ocean is a part of the climate system,which plays an important role in the climate and climate change.Seawater temperature is an important parameter for the heat balance of marine water.The study of sea water temperature distribution and its long-term changes in the South China Sea and the Northwest Pacific Ocean will lay the foundation for an in-depth understanding of the impact of Chinese marginal season climate change in China.This paper uses SODA₂.2.4 data which is developed by Maryland University ocean assimilation data,analysis of the South China Sea and adjacent to the Pacific Northwest climatological sea surface temperature distribution and the seven section surface to the deep sea water temperature distribution.The EOF method and wavelet analysis method are used to analyze the sea surface temperature anomaly and the variation period of six representative layers in 1871-2010.The main conclusions are as follows:?1?To study the state of SST temporal distribution characteristics of climate 1-4 months,North High and South low temperature distribution showed obviously characteristics,15°N north of in a large temperature gradient.The highest temperature in the South China Sea is in the west of Palawan?>27.5°C?.The Luzon Strait 121°E temperature is higher than the surroundings,convex to the north.Northwest Pacific Ocean warm water?>28 °C?appeared at 10°N south.In May,the sea water temperature increased significantly,18°N in the south,the temperature is over 29°C.Since June,the high temperature center moved to northward.In July,August and September,the temperature difference in the study area is not clear,most parts of the sea temperature is much higher?>29°C?,which is the highest temperature?>29.5°C?near the eastern Luzon Island and Hainan Island,the South China Sea Midwest 10-14°N temperature is relatively low.After October,the high temperature center moved to the south,and then North and the emergence of the phenomenon of isotherms along the latitude distribution,regional north-south temperature gradually increased.In December,the South China Sea and 29°C high temperature water no longer exists,the Pacific Northwest 29°C isotherm has dropped back to 10°N to the south.?2?To study the distribution characteristics of the SST spatial climatological surface,can be divided into seven regions: the South China Sea is divided into three zones,according to the regional differences of each month in the winter SST,southern latitude along the isotherm distribution of-2°C area isothermal line?18°N?is bounded by the isotherm north to the southeast coast of China is S1;18°N south of the isotherm in Vietnam coast region deflection is S2;0°C area isothermal line?15°N?to the south to 5°N is S3;in view of the Luzon Strait and the South China Sea and the Northwest Pacific SST distribution difference is bigger,the the Luzon Strait is divided into a separate district?L?.The Northwest Pacific Ocean is divided into 3 zones,in winter 0°C area isothermal line?17°N?is bounded to the north is divided into P1;the south of 17°N to 1.5°C area isothermal line?10°N?area the latitude of for the sector,divided into P2;1.5°C area isothermal line to the south is divided into P3.?3?According to the depth distribution of the climate sea surface temperature,it can be concluded that the 25 m has obvious seasonal variation,and the temperature difference is larger from January to March.After April,the temperature tends to the same,and the temperature difference began to increase after October.The thermocline depth in 200 m with shallow,the higher latitude with the seasonal thermocline is the higer temperature increases.In South China Sea area and the thermocline depth in the Luzon Strait winter is deeper than the summer,the depth difference occurred in Northwest Pacific District of the thermocline is large,which is no regularity.465 m,with a depth of almost no seasonal change,729 m to deep,the temperature of each district has no obvious partition,1625 m in depth,the temperature increaseing with the depth remains almost unchanged.?4?EOF analysis shows that the 5m layer has the same positive sea surface temperature anomaly,and the most positive anomaly is from Taiwan Island to Hainan Island and Vietnam coast.The 46 m layer in the South China Sea and the Pacific Northwest,there is a strong positive anomaly center,strong anomaly center of the South China Sea than the Pacific Northwest positive anomaly center north.The 197 m layer,which is located in the center of the positive anomaly in the Northwest Pacific Ocean,is larger than the 46 m layer.In the 465 m layer,the South China Sea is a positive anomaly,and there are two positive anomalies and two negative anomalies in the Northwest pacific.729 m layer and 1625 m layer,there is a weak positive and negative anomalies in the whole study area,the South China Sea is a consistent positive anomaly center,the positive anomaly is 10-14°N in the Northwest Pacific,and the rest is negative anomaly.?5?The time series and cycle analysis of the sea level anomaly EOF of the six representative layers are obtained,and the variation period of the South China Sea and the adjacent Northwest Pacific Ocean during 1871-2010.5m layer,which has 3-5 years,7 years and 13-15 years cycle.46 m layer,which has 5 years,7-9years,9-11 years and 13-15 years cycle.197 m layer,465 m layer,729 m layer and 1625 m layer,with 3-5,years 6-7 years,11-13 years cycle.?6?The change rate of the surface layer to the deep sea surface temperature in each district,and the maximum layer of sea surface temperature increase rate from 1871 to 2010 did not appear in the surface layer,which was located between the 25 and 125 m layers.The cooling layer appears between 100 m to 200 m.The maximum temperature increase rate is less than the South China Sea in the northwestern Pacific and the Luzon Strait,the maximum temperature increase rate of the depth of shallow waters of the South China Sea in the Northwest Pacific ocean.The maximum cooling rate is higher than the South China Sea in the Northwestern Pacific and the Luzon strait.From 1911 to 2010,except for S2 and P1 area,the maximum warming rate did not appear in the surface.During the four periods,the change rate of sea surface temperature in the South China Sea tend to be consistant,but the change rate of sea surface temperature in the North Pacific varied greatly with depth.