| 1. | Developing data assimilation system of numeric predict model by using the adjoint code technique is one of new four - dimensional data assimilation methods
用伴随码方法构造数值预报模式的伴随同化系统是目前较新的四维同化方法之一。 |
| 2. | Developing data assimilation system of numeric predict model by the use of adjoint coding technique is one of the new four - dimensional data assimilation methods
而用伴随码方法构造数值预报模式的四维变分伴随同化系统则是目前国际主流的方法之一。 |
| 3. | A two - dimensional variational ( 2dvar ) data assimilation system connected with mm5 model is set up which based on the augmented lagrangian algorithm of sasaki
本论文建立了基于sasaki增广lagrange算子算法并和mm5中尺度模式相结合的二维变分同化系统。 |
| 4. | The 3dvar data assimilation system has the ability to assimilate gms - 5 cloud drifted winds and toys data . the numerical simulation experiments of typhoon processes are carried out using the 3dvar data assimilation system
该同化系统有同化gms一5的红外和水汽轨迹风数据和tovs温湿数据的能力并可在pc机的linux系统下顺利运行。 |
| 5. | The typhoon track errors at model integral 24 hours and 48 hours reduce about 5 % and 10 . 5 % , respectively . though numerical simulation experiments of typhoon processes using 2dvar data assimilation system is not so good as that of the nudging method
但就所有的同化实验整体而言，台风路径误差在模式积分24时和48时分别减小约5和10 . 5 ，对单个台风路径误差可减少30 - 50 。 |
| 6. | The results of numerical experiments , using the four - dimensional variational data assimilation system of the nonhydrostatic mesoscale model mm5 , show that : the tangent linear model and adjoint model conducted by keeping the " on - off " switches the same as the basic state , can provide a good approximation of the first - order information to the nlm perturbation and a good descent direction for the minimization procedure ; switching on and off at every other time step in the kuo cumulus parameterization scheme do n ' t impact the convergence rate of cost function ; the existence of the switches do n ' t impact improvement to the mm5 model rainfall prediction because that not only specific humidity , but also wind , temperature and pressure are assimilated into the model
非静力中尺度数值模式mm5的四维变分资料同化系统进行的数值试验结果表明： “开关”变量保持与基态一致，所构造的切向线性模式能够提供关于非线性模式扰动的一阶近似，伴随模式所计算的梯度值能够为最小化过程提供较好的下降方向；郭氏降水参数化方案中对流每隔一个积分步的交替发生并不影响目标函数最小化的收敛速度； “开关”变量的存在也不影响将风、温度、气压和比湿结合起来同化对mm5降水预报准确性的提高。 |
| 7. | Then , the numerical simulation experiments with satellite assimilation are launched on three typhoons in 2002 using the 2dvar data assimilation system . the comparison analysis with other data assimilation methods , such as nudging , is also going on the simulation results to typhoon track influence
使用该二维变分同化系统，对2002年发生的三个台风进行了同化卫星数据的数值模拟实验，并对模拟结果同三维观测松弛逼近等数据同化方法对台风路径影响做了比较分析。 |
