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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >COMPARISON OF MODEL ESTIMATED AND MEASURED DIRECT-NORMAL SOLAR IRRADIANCE
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COMPARISON OF MODEL ESTIMATED AND MEASURED DIRECT-NORMAL SOLAR IRRADIANCE

机译：直接和正常太阳辐射模型估算值与实测值的比较

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Direct-normal solar irradiance (DNSI), the energy in the solar spectrum incident in unit time at the Earth's surface on a unit area perpendicular to the direction to the Sun, depends only on atmospheric extinction of solar energy without regard to the details of the extinction, whether absorption or scattering. Here we report a set of closure experiments performed in north central Oklahoma in April 1996 under cloud-free conditions, wherein measured atmospheric composition and aerosol optical thickness are input to a radiative transfer model, MODTRAN 3, to estimate DNSI, which is then compared with measured values obtained with normal incidence pyrheliometers and absolute cavity radiometers. Uncertainty in aerosol optical thickness (AOT) dominates the uncertainty in DNSI calculation. AOT measured by an independently calibrated Sun photometer and a rotating shadow-band radiometer agree to within the uncertainties of each measurement. For 36 independent comparisons the agreement between measured and model-estimated values of DNSI falls within the combined uncertainties in the measurement (0.3-0.7%) and model calculation (1.8%), albeit with a slight average model underestimate (-0.18 +/- 0.94)%; for a DNSI of 839 W m(-2) this corresponds to -1.5 +/- 7.9 W m(-2). The agreement is nearly independent of air mass and water-vapor path abundance. These results thus establish the accuracy of the current knowledge of the solar spectrum, its integrated power, and the atmospheric extinction as a function of wavelength as represented in MODTRAN 3. An important consequence is that atmospheric absorption of short-wave energy is accurately parametrized in the model to within the above uncertainties. [References: 31]
机译：直接法向太阳辐照度（DNSI），即单位时间内入射在垂直于太阳方向的单位面积上的地球表面上的太阳光谱中的太阳光谱能量，仅取决于太阳能在大气中的消光状态，而无需考虑其详细信息。消光，无论是吸收还是散射。在这里，我们报告了1996年4月在俄克拉荷马州中北部无云条件下进行的一系列封闭实验，其中将测得的大气成分和气溶胶光学厚度输入到辐射传输模型MODTRAN 3中，以估算DNSI，然后将其与用法向入射高温辐射计和绝对腔辐射计获得的测量值。气溶胶光学厚度（AOT）的不确定性主导着DNSI计算的不确定性。由独立校准的太阳光度计和旋转阴影带辐射计测量的AOT符合每次测量的不确定性。对于36个独立的比较，DNSI的测量值和模型估计值之间的一致性落在测量的不确定性（0.3-0.7％）和模型计算（1.8％）的组合不确定性之内，尽管平均模型略有低估（-0.18 +/- 0.94）％;对于839 W m（-2）的DNSI，这对应于-1.5 +/- 7.9 W m（-2）。该协议几乎与空气质量和水蒸气路径的丰度无关。因此，这些结果建立了以MODTRAN 3表示的太阳光谱，其积分功率和大气消退作为波长函数的当前知识的准确性。一个重要的结果是，大气中短波能量的吸收被精确地参数化。模型要在上述不确定性范围内。 [参考：31]

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