A New Simple Model of Direct Spectral Irradiance with Easily Observable Atmospheric Parameters

作者：Oke Shinichiro^*; Fukushige Naoyuki; Kemmoku Yoshishige; Takikawa Hirofumi; Sakakibara Tateki; Araki Kenji

来源：IEEJ Transactions on Electrical and Electronic Engineering, 2010, 5(5): 548-552.

DOI：10.1002/tee.20571

• direct irradiance
• spectral irradiance
• model DISPEC
• atmospheric parameters

Direct irradiance and direct spectral irradiance were measured for 16 months along, with other basic atmospheric parameters. The direct irradiance changed smoothly on a clear day and fluctuated on a fair day. Then, we considered the possibility of a new, simple model of direct spectral irradiance expressed with fewer atmospheric parameters and applicable for even fair days. This new model, called DISPEC, can calculate the direct spectral irradiance from basic atmospheric parameters for wavelengths >400 nm. In DISPEC, the ozone absorption was ignored and the thin cloud effect was taken into account as a new parameter, which was considered to be proportional to the direct irradiance, instead of aerosol parameters. The performance of DISPEC was then compared with that of a well-known model of SPCTRAL2. Although the calculation results by SPCTRAL2 exhibited considerable error, especially in visible wavelength range on a fair day, those calculated using DISPEC showed good agreement with observed data on both clear and fair days.

• 出版日期2010-9