Page 52 - 《高原气象》2023年第1期

高 原 气 象 42 卷
48

Integration and Evaluation of Multi-source Meteorological

Radiation Data over Qinghai-Xizang Plateau

LIU Na， XIONG Anyuan， ZHANG Qiang， FENG Aixia
（National Meteorological Information Center， Beijing 100081）

Abstract： Based on multi-source of radiation observations from CMA operational， Qinghai-Xizang Plateau At‐
mospheric Scientific Experiment and Chinese Academy of Sciences field stations， the integrated of multi-
source radiation data over Qinghai-Xizang Plateau（IRDQTP）since 1993 has been constructed through quality
control， splicing and integration. The percent of each radiation element actual records is more than 99. 4%. The
accuracy rate of photosynthetic effective radiation is less than 76%， and other elements are more than 96. 7%.
The correlation coefficient of downward shortwave radiation between atmospheric scientific experiment and
meteorological operational observations at the same or similar sites exceeds 0. 88. The Mbias （RMSE） of Ali
（the same station site） between operational and experimental observations is -0. 006 （0. 141） MJ·m ·h ，
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with 99. 8% distributes between -1. 0 and 1. 0 MJ·m ·h ， and Naqu （similar station site） is -0. 028 （0. 615）
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MJ·m ·h ， with 84. 6% distributes between -1. 0 and 1. 0 MJ·m ·h . The difference between the operational
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and experimental observations shows obvious seasonal and diurnal variations. It is little in autumn and winter
while large in spring and summer. Affected by the difference of radiometer sensitivity and environmental re‐
sponse parameters， the difference gradually increases with the rapid increase （rapid decrease） of short-wave radi‐
ance in the sunrise period （sunset period） while decreases gradually with the increase of short-wave radiance dur‐
ing other times. It reaches the maximum when the change rate of short-wave radiation reaches the maximum.
There are daily variations in downward shortwave radiation and net radiation with a single peak distribution. The
downward shortwave radiation reaches the maximum at 12:00 （local average solar time， similarly hereinafter） in
spring and autumn which is 2. 71 and 2. 21 MJ·m ·h respectively while at 13:00 in summer and winter which is
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2. 58 and 1. 89 MJ·m ·h respectively. The net radiation reaches the maximum at 12:00 in spring and autumn
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which is 1. 37 and 1. 15 MJ·m ·h respectively while at 13:00 in summer and winter which is 1. 53 and 0. 80
MJ·m ·h respectively. Affected by climatic conditions and topographic factors， there are obvious spatial varia‐
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tions for downward shortwave radiation and net radiation distribution. Taking 85°E and 95°E as the dividing line，
the downward shortwave radiation shows a gradually decreasing distribution pattern from west to east. It is
594. 44， 582. 56 and 461. 95 MJ·m ·mon in western， central and eastern region respectively. The net radiation
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presents a low-high-low distribution pattern from west to east. It is 129. 68， 207. 13 and 173. 56 MJ·m ·mon in
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western， central and eastern region respectively.
Key words： Qinghai-Xizang Plateau； multi-source； meteorological radiation data； integration； evaluation