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首页> 外文期刊>Atmosphere-ocean >Surface-Absorbed and Top-of-Atmosphere Radiation Fluxes for the Mackenzie River Basin from Satellite Observations and a Regional Climate Model and an Evaluation of the Model
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Surface-Absorbed and Top-of-Atmosphere Radiation Fluxes for the Mackenzie River Basin from Satellite Observations and a Regional Climate Model and an Evaluation of the Model

机译：麦肯齐河流域的地面吸收和大气最高辐射通量的卫星观测和区域气候模型及模型评估

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摘要

Both the earth-reflected shortwave and outgoing longwave radiation (OLR) fluxes at the top of the atmosphere (TOA) as well as surface-absorbed solar fluxes from Canadian Regional Climate Model (CRCM) simulations of the Mackenzie River Basin for the period March 2000 to September 2003 are compared with the radiation fluxes deduced from satellite observations. The differences between the model and satellite solar fluxes at the TOA and at the surface, which are used in this paper to evaluate the CRCM performance, have opposite biases under clear skies and overcast conditions, suggesting that the surface albedo is underestimated while cloud albedo is overestimated. The slightly larger differences between the model and satellite fluxes at the surface compared to those at the TOA indicate the existence of a small positive atmospheric absorption bias in the model. The persistent overestimation of TOA reflected solar fluxes and underestimation of the surface-absorbed solar fluxes by the CRCM under all sky conditions are consistent with the overestimation of cloud fraction by the CRCM. This results in a larger shortwave cloud radiative forcing (CRF) both at the TOA and at the surface in the CRCM simulation. The OLR from the CRCM agrees well with the satellite observations except for persistent negative biases during the winter months under all sky conditions. Under clear skies, the OLR is slightly underestimated by the CRCM during the winter months and overestimated in the other months. Under overcast conditions the OLR is underestimated by the CRCM, suggesting an underestimation of cloud-top temperature by the CRCM. There is an improvement in differences between model and satellite fluxes compared to previously reported results largely because of changes to the treatment of the surface in the model.
机译：大气层顶部的地球反射短波和长波辐射通量（TOA），以及麦肯锡河流域2000年3月加拿大区域气候模型（CRCM）模拟的表面吸收太阳通量将2003年9月之前的数据与通过卫星观测得出的辐射通量进行比较。本文用于评估CRCM性能的TOA和地表模型与卫星太阳通量之间的差异在晴空和阴天条件下具有相反的偏差，这表明表面反照率被低估了，而云层反照率被低估了。高估了。与TOA相比，模型和地面卫星通量之间的差异稍大，表明模型中存在较小的正大气吸收偏差。在所有天空条件下，CRCM对TOA反射太阳通量的持续高估和对表面吸收太阳通量的低估与CRCM对云分的高估相一致。这导致在CRCM模拟中，TOA和地面的短波云辐射强迫（CRF）都更大。 CRCM的OLR与卫星观测非常吻合，除了在冬季在所有天空条件下持续存在的负偏差外。在晴朗的天空下，CRCM在冬季月份略微低估了OLR，而在其他月份则高估了OLR。在阴天条件下，CRCM会低估OLR，这表明CRCM会低估云顶温度。与以前报告的结果相比，模型和卫星通量之间的差异有所改善，这在很大程度上是由于模型表面处理的变化。

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