搜索结果: 1-7 共查到“4D-Var”相关记录7条 . 查询时间(0.218 秒)
条件植被温度指数（VTCI）综合了地表主要参数——归一化植被指数（NDVI）和地表温度（LST），能够较为准确地对干旱进行监测，可为抗旱救灾、作物估产等提供科学依据。为了提高VTCI的区域估产精度，以陕西省关中平原为研究区域，将遥感反演的VTCI与CERES-Wheat小麦生长模型模拟的土壤浅层含水率相结合，通过四维变分（4D-VAR）同化算法实现2008—2014年冬小麦主要生育期旬尺度VTCI...
Comparison of the ensemble Kalman filter and 4D-Var assimilation methods using a stratospheric tracer transport model
the ensemble Kalman filter 4D-Var assimilation methods stratospheric tracer transport model
2014/12/19
An ensemble Kalman filter (EnKF) assimilation method is applied to the tracer transport using the same stratospheric transport model as in the four-dimensional variational (4D-Var) assimilation system...
The SPRINTARS version 3.80/4D-Var data assimilation system: development and inversion experiments based on the observing system simulation experiment framework
SPRINTARS development inversion experiments
2014/12/12
We present an aerosol data assimilation system
based on a global aerosol climate model (SPRINTARSSpectral Radiation-Transport Model for Aerosol Species)
and a four-dimensional variational data assim...
Efficient estimation of time-mean states of ocean models using 4D-Var and implicit time-stepping
Efficient estimation time-mean states ocean models 4D-Var implicit time-stepping
2009/11/3
We propose an efficient method for estimating a time-mean state of an ocean model subject to given observations using implicit time-stepping. The new method uses (i) an implicit implementation of the ...
A comparison of the performance of 4D-Var in an explicit and implicit version of a nonlinear barotropic ocean model
4D-Var explicit and implicit version nonlinear barotropic ocean model
2009/11/3
A comparison is made of the performance of the four-dimensional variational data assimilation (4D-Var) method in an explicit and implicit version of a barotropic quasi-geostrophic model of the wind-dr...
Stratospheric age of air computed with trajectories based on various 3D-Var and 4D-Var data sets
Stratospheric age trajectories 3D-Var 4D-Var
2009/1/23
The age of stratospheric air is computed with a trajectory model, using ECMWF ERA-40 3D-Var and operational 4D-Var winds. Analysis as well as forecast data are used. In the latter case successive fore...
4D-Var assimilation of MIPAS chemical observations: ozone and nitrogen dioxide analyses
4D-Var MIPAS ozone nitrogen dioxide
2008/11/24
This paper discusses the global analyses of stratospheric ozone (O3) and nitrogen dioxide (NO2) obtained by the Belgian Assimilation System for Chemical Observations from Envisat (BASCOE). Based on a ...
