Simulation Of Nutrient Deposition In Offshore China Based On Regional Sand Dust Nutrient Numerical Model

Sand and dust not only affect the radiation balance of the Earth system,but also increase the concentration of atmospheric particulate matter,leading to a decrease in air quality.Sand and dust are also important sources of marine nutrient inputs,accelerating marine biological cycles and ocean-atmosphere material exchange,and affecting marine primary productivity.In this study,WRF-chem is the main model.Under the framework of the improved dust-nutrient numerical model,the global soil surface nutrient data and meteorological data in binary format are input.Quantitative assessment of soil nutrient loss under spring wind erosion in the arid region of eastern Asia in the past five years and its nutrient deposition to the eastern coastal waters of my country.The main research results are as follows.Soil nutrient loss in spring in the arid zone of eastern Asia in the last five years was fluctuating,with total nutrient loss in 2018>2017>2021>2020>2019.The annual average total spring loss fluxes of nutrients total potassium（TK）,total nitrogen（TN）,iron（Fe）and total phosphorus（TP）in the last five years were111.78mg/m~2,71.01mg/m~2,21.34mg/m~2 and 0.593mg/m~2,respectively.the areas with higher nutrient losses were mainly concentrated in southern Mongolia,northwestern Inner Mongolia and Xinjiang and Gansu.Sand and dust carrying nutrients transported over long distances can be deposited to sea areas such as the Bohai Sea and the Yellow Sea.The total deposition flux in the Bohai Sea waters in the spring of the last five years is smaller than that in the Yellow Sea waters,and the total deposition of nutrients deposited to the waters each year is 600.52t,397.23t,242.99t,228.49t and 176.56t respectively by size,and the deposition of nutrients TP is much smaller than that of TK,TN and Fe.The annual average deposition amounts of different nutrients such as TP,TN,TK and Fe deposited to the sea in the spring of the last five years were 0.96t,156.32t,134.61t and 37.27t,respectively,and the deposition distribution of nutrients in the sea had temporal variability.Establish a reasonable dust-nutrient release,transport and deposition scheme,quantitatively assess soil surface nutrient loss,estimate the contribution of dust to ocean nutrients,and provide a basic reference for studying carbon exchange at the air-sea interface.Simulate the nutrient deposition flux in the offshore waters of my country,use the calibrated parameters,and extrapolate the scale to the global scale to generate the spatiotemporal patterns of nutrient deposition such as N,P,Fe,etc.,to study the response of marine biomes to climate change,and the impact of marine carbon sinks on The response to elevated carbon dioxide concentrations is significant.