西藏羊八井地区地表辐射的时间变化特征研究  

Study on the Temporal Variation of Surface Radiation at Yangbajing on the Qinghai-Tibet Plateau

作　　者：赵文娜 次仁尼玛[1,2] 王一楠 宣越健 ZHAO Wenna;Tsering-Nyima;WANG Yinan;XUAN Yuejian(School of Science,Tibet University,Lhasa 850000,China;Key Laboratory of Cosmic Rays,Ministry of Education,Tibet University,Lhasa 850000,China;Key Laboratory of Middle Atmosphere and Global Environment Observation(LAGEO),Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]西藏大学理学院,西藏拉萨850000 [2]西藏大学宇宙线教育部重点实验室,西藏拉萨850000 [3]中科院大气物理研究所中层大气和全球环境探测重点实验室,北京100049

出　　处：《高原科学研究》2022年第4期42-49,共8页Plateau Science Research

基　　金：国家自然科学基金项目(11947411);第二次青藏高原综合科学考察研究“大气成分垂直结构及其气候影响”(2019QZKK0604)。

摘　　要：文章利用青藏高原羊八井观测站2020—2021年为期两年的太阳短波辐射数据和地气长波辐射数据,对该地区的短波辐射和长波辐射、地表反照率、云短波辐射强迫效应随时间(月份和季节)变化特征进行了分析。结果显示,羊八井地区太阳短波总辐射和地表净辐射都呈显著的单峰月际变化特征,月平均值6月最高,12月最低;大气逆辐射和地面向上长波辐射月平均值1月最低,最高值分别出现在7月和6月;地面反射的太阳短波辐射月平均值4月最高,9月最低;地表反照率的日变化和年变化趋势均呈“U”形分布,且月平均值2月最大,7月最小;云对太阳短波辐射的强迫效应值全年为负值,变化范围为-22.4~-233.6 W/m^(2),7月最高,11月最低。此外还发现该地区太阳短波总辐射瞬时值超过太阳常数的现象存在且主要发生在春季、夏季和秋季三个季节,其中夏季发生次数最多。In this paper,the temporal variation of surface radiation,surface albedo,as well as cloud-induced shortwave radiative forcing are studied using the data measured at Yangbajing Observation Station on the Qinghai-Tibet Plateau in 2020 and 2021.According to our derived results,the monthly variation of the total solar radiation and the net surface radiation in the Yangbajing area show a significant unimodal pattern,with the highest value found in June and the lowest value in December.The lowest monthly averaged values of downward solar radiation and upward longwave radiation are found in January,while their highest values are found in July and June,respectively.Moreover,for the upward solar shortwave radiation,its highest monthly mean value appeared in April and the lowest value in September.The diurnal and annual variation of surface albedo in this area show a"U-shaped"distribution,with the highest value found in February and the lowest in July.The cloud-induced shortwave radiative forcing in this area is negative throughout the year,ranging from-22.4 W/m^(2) to-233.6W/m^(2),with the highest value appearing in July and the lowest value in November.In addition,the phenomenon that the instantaneous value of the measured total solar radiation exceeds the solar constant mainly occurs in spring,summer,and autumn,and summer is the most frequent one.

关 键 词：太阳辐照度 地表辐射 净辐射 地表反照率 云辐射强迫 羊八井 

分 类 号：P422.2[天文地球—大气科学及气象学]