SWAT模型中国大气同化驱动数据集（CMADS V1.1）（2008-2016）

CMADS V1.1(The China Meteorological Assimilation Driving Datasets for the SWAT model Version 1.1) 版本数据集引入STMAS同化算法, 利用数据循环嵌套,模式推算等多种技术手段而建立。CMADS V1.1数据集按照SWAT模型输入驱动数据格式进行了格式整理与修正,使SWAT模型可直接使用该数据集而不需要任何格式转换。CMADS V1.1数据集同时建立了两种格式的数据(.dbf和.txt),方便其他它模型应用人员及气象分析人员调用与分析。CMADS数据源介绍：气温、气压、比湿、风速驱动数据采用了2421个国家级自动站和业务考核的29452个区域自动站2009年1月以来地面基本气象要素逐小时观测数据以及相应时期的台站信息（台站经纬度、海拔高度）,利用多重网格三维变分方法（STMAS）,在NCEP/GFS背景场基础上制作地面基本要素分析场；其中,中国区域以外,只对NCEP/GFS背景数据做地形调整、变量诊断,并插值到分析格点；中国区域以内,利用STMAS算法,将经过前处理的NCEP/GFS背景数据和自动站观测融合,并与中国区域以外的数据进行拼接。降水：由多卫星与地面自动站降水融合而成。其中,中国区域以外采用NCEP-CPC制作的CMORPH卫星融合降水产品,中国区域采用CMORPH产品为背景场融合中国降水自动站观测制作的中国区域小时降水量融合产品。辐射：基于DISSORT辐射传输模型,获取来自FY2E卫星一级产品实时反演太阳短波辐射产品。主要以ISCCP资料为背景数据,利用大气辐射传输模式DISORT对FY2D/E标称图数据进行反演,计算出分析格点上的地面入射太阳总辐射辐照度。本页发布的数据集为CMADS V1.1版本空间分辨率: 1/4°,时间分辨率:逐日，时间尺度为2008-2016年。空间覆盖范围:东亚(0°N-65°N,60°E-160°E)。提供要素:日平均2米温度,日最高\低2米温度,日累计24时降水量,日平均太阳辐射,日平均气压,日比湿度,日相对湿度,日平均10米风速,提供数据格式:dbf及txt。

The CMADS V1.1 (The China Meteorological Assimilation Driving Datasets for the SWAT model Version 1.1) dataset was developed by introducing the STMAS assimilation algorithm and multiple technical means including data cyclic nesting and model extrapolation.
The CMADS V1.1 dataset has been formatted and revised in accordance with the input driving data requirements of the SWAT model, enabling direct usage of the dataset by the SWAT model without any format conversion.
Meanwhile, two data formats (.dbf and .txt) are provided to facilitate access and analysis by users of other models and meteorological analysts.

Data sources of CMADS: For the driving data of air temperature, atmospheric pressure, specific humidity and wind speed, hourly observational data of surface basic meteorological elements since January 2009 from 2421 national automatic weather stations and 29452 regional automatic weather stations under operational assessment, as well as station information (station longitude, latitude and altitude) in the corresponding period were used. The surface basic element analysis fields were generated based on the NCEP/GFS background field using the multi-grid three-dimensional variational method (STMAS). For regions outside China, only terrain adjustment, variable diagnosis and interpolation to analysis grid points are performed on the NCEP/GFS background data; within China, the preprocessed NCEP/GFS background data and automatic station observations are fused using the STMAS algorithm, and then spliced with data from regions outside China.

Precipitation data: Derived from the fusion of multi-satellite and ground automatic station precipitation observations. For regions outside China, the CMORPH satellite fusion precipitation product developed by NCEP-CPC is adopted; within China, the hourly precipitation fusion product for China is generated by fusing China's precipitation automatic station observations using the CMORPH product as the background field.

Solar radiation data: Real-time retrieved solar shortwave radiation products from the FY-2E satellite level 1 data are obtained based on the DISSORT radiative transfer model. Taking ISCCP data as the background data, the DISORT atmospheric radiative transfer model is used to retrieve the nominal map data of FY-2D/E, and the ground-incident total solar radiation irradiance at the analysis grid points is calculated.

The dataset released on this page is CMADS V1.1, with the following specifications:
- Spatial resolution: 1/4°
- Temporal resolution: Daily
- Temporal coverage: 2008–2016
- Spatial coverage: East Asia (0°N–65°N, 60°E–160°E)
- Provided variables: Daily average 2-meter temperature, daily maximum and minimum 2-meter temperature, daily cumulative 24-hour precipitation, daily average solar radiation, daily average atmospheric pressure, daily specific humidity, daily relative humidity, daily average 10-meter wind speed
- Provided data formats: .dbf and .txt