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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >An Assessment of the FY-3A Microwave Temperature Sounder Using the NCEP Numerical Weather Prediction Model
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An Assessment of the FY-3A Microwave Temperature Sounder Using the NCEP Numerical Weather Prediction Model

机译：使用NCEP数值天气预报模型评估FY-3A微波测温仪

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摘要

The MicroWave Temperature Sounder (MWTS) on FY-3A has four channels with designed band central frequencies of 50.3, 53.6, 54.9, and 57.3 GHz, respectively. Lu found that the central frequency for three upper level sounding channels shifted after the satellite launch into orbit. This study confirms the findings Lu using a different numerical weather prediction (NWP) model and a different radiative transfer model. Furthermore, it is shown that the strong temperature dependence of MWTS $O - B^{rm DF}$ biases found in our earlier work is mostly induced by these frequency shifts, where O represents MWTS observations and $B^{rm DF}$ is model simulations. The mean difference of brightness temperature simulations with $(B^{rm SF})$ and without $(B^{rm SF})$ incorporating the frequency shifts into the radiative transfer model resembles the $O - B^{rm SF}$ biases. For NWP applications of FY-3A MWTS data, it is sufficient to generate new fast radiative transfer model coefficients that incorporate the new passband parameters, and the resulting MWTS $O - B^{rm shifted}$ biases become constant as those of MetOp-A/NOAA-18 AMSU-A data. For climate applications, the FY-3A MWTS brightness temperatures adjusted by subtracting $B^{rm SF} - B^{rm DF}$ match quite well with the MetOp-A/NOAA-18 AMSU-A data at the simultaneous nadir overpass locations in both the Arctic and Antarctic.
机译：FY-3A上的MicroWave温度探测器（MWTS）具有四个通道，其设计的频带中心频率分别为50.3、53.6、54.9和57.3 GHz。卢发现卫星发射进入轨道后，三个高层探测通道的中心频率发生了变化。这项研究使用不同的数值天气预报（NWP）模型和不同的辐射传递模型证实了Lu的发现。此外，还表明，在我们较早的工作中发现的MWTS $ O-B ^ {rm DF} $偏差与温度的强烈相关性主要是由这些频移引起的，其中O代表MWTS观测值，而$ B ^ {rm DF} $是模型模拟。带有$（B ^ {rm SF}）$和不带有$（B ^ {rm SF}）$且未将频率偏移纳入辐射传递模型的亮度温度模拟的平均差类似于$ O-B ^ {rm SF} $偏差。对于FY-3A MWTS数据的NWP应用，生成包含新通带参数的新的快速辐射传递模型系数就足够了，并且由此产生的MWTS $ O-B ^ {rm shift} $偏差与MetOp- A / NOAA-18 AMSU-A数据。对于气候应用，通过减去$ B ^ {rm SF}-B ^ {rm DF} $调整的FY-3A MWTS亮度温度与同时达到最低点的MetOp-A / NOAA-18 AMSU-A数据非常匹配在北极和南极的位置。

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