Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-08-25 Cooperative journals: 《干旱区研究》
Abstract： The temporal variation, spatial distribution, and temporal and spatial evolution characteristics of thetotal radiation in Northwest China were studied using meteorological observation data from 169 nationalmeteorological stations in Northwest China, over the past 60 years. The Qaidam Basin in the Northwest ofQinghai and the west of Gansu were the most abundant areas for solar energy resources, the smaller areas in thesouth of Shaanxi and the southeast of Gansu were found to be resource rich areas, and the other large areas areresource rich areas. From 1961 to 2020, the total radiation showed an upward trend in Southwest Xinjiang, theborder area between Gansu and Xinjiang, and smaller areas in northern Gansu and northern Shaanxi, while thetotal radiation showed a downward trend in most regions of Northwest China. The eigenvector field of EOF mode1 shows that the total radiation oscillation intensifies from west to east, and the high load area for eachcomponent is mainly concentrated in the middle and east, which is the region where the total radiation is prone tobe abnormal and the oscillation is strong and sensitive. The eigenvector field of the second EOF mode presents adipole type from west to east. Qinghai and most of the Gansu are positive regions, which are also the regions withthe strongest total radiation and abnormal oscillation. According to the different modal spatial differentiationstructure types for the REOF eigenvectors, the study area can be divided into three sub regions, namely:“Easternnorthwest anomaly type”which is affected by the East Asian monsoon;“Central northwest anomaly type”whichis the marginal region and mainly affected by the East Asian monsoon; and“Western Northwest anomaly type”which is mainly affected by the westerlies. The mutation points for total radiation reduction in the threesubregions occurred in 1973, 2017, and 2008 respectively.
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