As a China’s second generation of polar-orbitting meteorological satellites

FY-3A（Fen Yun means wind and cloud） was launched on May 27

2008.The microwave temperature sounder（MWTS） and microwave humidity sounder（MWHS） are first aboard the Chinese FY satellite for the purpose of retrieving atmospheric temperature and humidity profiles.There are four channels of MWTS

i.e.50.30

53.596±0.115

54.94 and 57.29 GHz

with corresponding bandwidths 180

340

400 and 330 MHz

respectively

and five channels of MWHS

i.e.dual polarized（V

H） 150

183.31±1.0

183.31±3.0 and 183.31±7.0 GHz

which are corresponding to the bandwidths 1000

500

1000 and 2000 MHz

respectively.The spatial resolutions of MWTS and MWHS at sub-point are 50/75 km and 15 km

respectively

and the fields of views are 15 and 98 lines

respectively.Both scan modes are cross-track scanning. Based on the algorithms of atmospheric absorption coefficients

i.e.the MPM（Millimeter Propagation Model） and ROS（Rosenkranz’s model）

this paper presents a novel MIX（mixed） model for calculation of atmospheric absorption coefficients in the multiple channels of MWTS and MWHS under China National Standard Atmosphere （GB 1920-80） and U.S.Standard Atmosphere

1976. Using atmospheric radiative transfer with the in situ measurements of 836 radiosonde datasets（including the altitude

pressure

atmospheric temperature and humidity） from 16 sites in China and Japan

multiple channel brightness temperature（T

b

） are simulated

and compared with FY-3A MWTS/MWHS observations as good validation.The radiosonde measurements were issued by NOAA/ESRL（National Oceanic and Atmospheric Administration/Earth System Research Laboratory）.The simulations with the atmospheric absorption coefficients based on respective MPM

ROS and our MIX algorithms are also analyzed.Data validation shows good performance of the MIX model. The statistical D-matrix is firstly constructed from the MWTS/MWHS T

b

data and the corresponding radiosonde measurements

and then is applied to the retrieval of atmospheric temperature and humidity profiles over the northwestern Pacific Ocean during 2008’s Phoenix typhoon.A 3D distribution of the atmospheric temperature and humidity is also presented.Comparison and data fusing of FY-3A and other satellites shall be an interesting mission for future operational service.Large coverage of MWHS can be beneficial to further study of atmospheric parameters retrievals.