Multi-scale Spatiotemporal Variation Process And Mechanism Of Ocean Temperature And Salinity In The Typhoon Transit Area

Upper ocean response to the typhoon and forecasting model,was one of important to support the direction of the National Key Basic Research in 2013.Grasp the changing state of the marine environment during typhoon,is the key to further reveal the air sea interaction process during typhoon,which is the basis of forecasts for intensity and path.Due to the lack of high resolution ocean measured data within the Tropical Cyclone in the past,the research of the marine boundary layer inside typhoon is less.Currently,along with the accumulation of all kinds of marine data(such as Argo),the conditions for carrying out the research on the interior of typhoon are already available.Based on all kinds of data,this research established the spatial structure of temperature and salinity of the upper ocean during typhoon.Process changes in ocean temperature and salinity were obtained,for the next typhoon intensity of services.Firstly,by comparing the two types of typhoon data sets,the research data and the research area are selected.The feasibility of using Argo data to calculate the sea temperature field during typhoon was analyzed.The results showed that: time error is less than the distance error.When the selected buoy time is 13 hours earlier than the target time and the range of target is less than 8km,the error is the smallest.If the power value of p is 2,while the number is around five buoys,RMSE will be less than 0.6,and the relative error is less than 0.2%.Secondly,typhoon case test results show that: typhoon will lead to heating and cooling of sea in 0-300 m deep.Structural changes of temperature in the vertical direction can be divided into four types: the upper and lower temperature cooling predominant,the upper and lower temperature heating predominant,upper temperature heating lower cooling,upper and lower variedThere was 60-80% of the typhoon center cooling in 0-50 m depth.From the 50 m deep,cool percentage decreased gradually,while fell 50 percent in the 120 m deep.From the depths of 120 m temperature starts to heat up,which mainly in the 150 m deep warming percentage accounted for 68%.The results of changes of sea salinity during typhoon show that: typhoon would change the depth of the halocline,but in the 600 m depth,salinity was almost no change.Within in three days during typhoon,the typhoon will change the vertical distribution of salinity of the upper ocean,in 0-10 m depth salinity would fall due to precipitation,and in 50-150 m depth increases due to the mix,where the maximum salinity values was in this depth.The impact of the typhoon on the ocean could be divided into inner and outer two layers in in 0-300 m depth.The central area was pumping action,which could affect the depth of 300 m.In the periphery was mixed as the main effect,forming one high and one low water temperature structure,while the most significant effect was at 160 m.Eight studies of typhoon show that: when the wind speed of typhoon center maximum is less than 25m/s,salinity of 8 typhoons overall reduction in 0-50 m depth.When the wind speed of typhoon center maximum is 25-35m/s,in 0-50 m depth salinity of 7 typhoons increases,a typhoon reduced.Compared with the change of temperature and salinity,when the maximum wind speed of typhoon center is 25-33m/s,changes of temperature and salinity in point,line,and surface were got during typhoon.