Study Of Interdecadal Change In East Asian Summer Monsoon With A Dimensional Nonlinear Model

The aberrance of the East Asian monsoon has a great influence on the climate of China, to which the meteorologists pay a lot attention. The research includes a huge number of genes. This dissertation includes following three parts:1. Based on observation of NVEP/NCAR reanalysis data, it is found that the East Asian summer monsoon variated in the late 1970s, which is proved right by using the MTT method.We establish a model to investigate the East Asian summer monsoon:CdT/dt=1/4μI₀(1-α)(1-ε)(a+bT) 1/4μI₀(1-α)αis the planetary albedo, andεis resultful emissivity of the atmosphere thereinto, on which the cloudage,co₂,vapor and moteall have a huge influence .2. Then we disscuss how canαandεwork on the system.3. We study the model of the East summer monsoon by using Entropy theoretics. The most notable result is the occurrence of saddle-node bifurcations against changes in those quantities which govern the heat balance of the system, i.e., the planetary albedo, the insolation, and the CO₂ concentration. These findings are remarkable insofar as they indicate that anthropogenic perturbations of the planetary albedo, such as sulphur emissions and/or land-use changes, or natural variations in insolation and CO₂ concentration could trigger abrupt transitions between different monsoon regimes.