Interannual and Decadal Variations of Surface Solar Radiation over East China in the First Half of the 20th Century

Variability and long-term trends of sunshine duration(SSD) and total cloud cover(TCC) were studied based on surface observations from 10 meteorological stations over East China in the first half of the 20 th century. The correlation coefficients between SSD and diurnal temperature range(DTR), as well as TCC, were analyzed. SSD experienced a significant increasing trend(0.16 h d-1 per decade) from 1908 to 1936, and the maximum brightening was in autumn(0.33 h d-1 per decade). The good agreement between the variability of SSD and DTR, supported by the correlation coefficient between them of 0.72, implies that the SSD measurements were reliable. TCC showed a decreasing trend(-0.93% per decade) and was significantly inversely related to SSD(-0.74), indicating the variation of SSD was attributable to changes in cloud cover. The result was obviously different to that since the 1960 s, when clouds could not account for the decadal trend of surface solar radiation in China.

Effect of ground cover changes on solar radiation absorption in Three Northeastern Provinces of China

Background,aim,and scope Solar radiation is the main source of energy for terrestrial ecosystems.Small changes in the absorption of solar radiation at the ground surface can have a significant impact on the climatic environment.Natural and anthropogenic changes in ground cover are important factors affecting the absorption of solar radiation at the ground surface.This phenomenon is particularly pronounced in the mid and high latitudes.In order to quantify the inf luence of surface cover change on the absorption of solar radiation at the surface and to provide a scientific basis for changes in the climatic environment,this paper analyzed ground cover change,ground absorbed solar radiation change and the effect of ground cover change on ground absorbed solar radiation in the Three Northeastern Provinces of China from 2001 to 2018.Materials and methods In this study,the Three Northeastern Provinces of China were used as the study area.Firstly,satellite remote sensing data were used to obtain land cover data and albedo data for Aug.1st of each year in 2001,2005,2010,2015 and 2018.The albedo data were further used to calculate the absorbed solar radiation data at the ground surface.Next,the land cover data were used to count the area changes and shifts of different land classes over the five-year period.The land cover data were overlaid with the surface absorbed solar radiation data to obtain the mean and standard deviation of radiation absorption for different ground classes.The surface absorbed solar radiation data were subtracted to obtain the changes in surface absorbed solar radiation for 2001-2005,2005-2010,2010-2015 and 2015-2018.Ultimately,we used a combination of shifted changes in ground classes and changes in surface absorbed solar radiation data,with unchanged ground classes as a baseline and data such as slope orientation as an aid.We analyzed the effect of ground cover change on surface absorbed solar radiation at regional and pixel point scales.Results(1)The area of woodland and waters in the Three Northeastern Provinces of China increased and then decreased from 2001 to 2018,with an overall increase of 3.96%and 10.51%respectively.Cropland decreased and then increased,with a total decrease of 1.22%.Grassland continued to decrease,with an overall decrease of 19.36%.Building sites increased all the time,with a total increase of 11.08%.The main types of ground cover shifted were woodland,cropland and grassland.The main factors for the change in ground cover were China’s woodland protection policy and the saturation of the total woodland stock.(2)The five ground types absorb solar radiation in the order of waters>building sites>woodland>grassland>cropland.The surface absorption of solar radiation in the Songnen Plain,the Sanjiang Plain and the Songhua River Basin flowing through the Songnen Plain and the Sanjiang Plain varies significantly,by more than 25 W·m^(-2).(3)Changes in the ground cover type affected the absorption of solar radiation energy by the ground surface.There was a clear trend of interconversion between waters and cropland/grassland,cropland and woodland/grassland.In particular,the conversion of waters to both cropland and grassland radiation absorption values decreased significantly,while the opposite increased.The absolute difference between waters and cropland was a maximum of -156.66 W·m^(-2)in 2010-2015,and between waters and grassland was a maximum of 102.36 W·m^(-2) in 2005-2010.The radiative absorption values of woodland and grassland reclamation declined and conversely increased.The absolute difference between woodland and cropland was a maximum of-13.94 W·m^(-2) in 2010-2015 when woodland converted to cropland,and between grassland and cropland was a maximum of 22.36 W·m^(-2) in 2001-2005 when cropland converted to grassland,respectively.Discussion Ground cover changes in the Three Northeastern Provinces of China from 2001-2018 were inextricably linked to natural factors and the inf luence of Chinese national policies.The main inf luencing factors were China’s woodland protection policy,restoration of woodland fire sites,saturation of total woodland,optimization of cropland patterns,sanding of grassland,expansion of water conservancy projects,and urbanization expansion.There were differences in the radiation absorption characteristics of different ground cover types.This was due to the nature of the ground type itself and the regional environment.When ground cover types changed,their ability to absorb solar radiation also changed.The degree of change could be inf luenced by different ground types and different environmental factors.Different spatial scales can also produce variability.We need to consider the effects of ground cover change on the absorption of solar radiation at the surface in an integrated and comprehensive way.Conclusions The Three Northeastern Provinces of China had frequent changes in ground cover from 2001-2018,with the area of grassland decreased by almost 20%.These changes were due to natural environmental change and policies issued by China since the 21st century.The extent to which solar radiation was absorbed by different ground cover types was different,with grassland being the strongest and cropland the least.In the past few years,the Songnen Plain and Sanjiang Plain regions were the most significant changes in the absorption of solar radiation by the ground cover.The change in ground cover type led to a change in solar radiation absorption at the ground surface,with the conversion of waters to cropland or grassland and the conversion of cropland to woodland or grassland showing the greatest change in radiation absorption values,and vice versa.Of these,the absolute difference in the conversion of waters to cropland amounts to-156.66 W·m^(-2) in 2010-2015.The variation in the absorption of solar radiation at the ground surface was related to the characteristics of the ground class itself,but was also limited by the regional environment.Recommendations and perspectives This study showed that surface cover change can affect the absorption of solar radiation at the surface to varying degrees.The unchanged land classes were used as a comparative analysis in this paper,and it was clear from the paper that some of the unchanged land classes showed significant changes in radiation absorption that should be of interest in future studies.

Variation Trend of Total Solar Radiation in Nujiang Basin in Recent 30 Years

Based on the data of sunshine duration,cloud cover and relative humidity from 9 stations in 1981-2008,the spatial and temporal distribution and change trend of total solar radiation in river valley basin of Nujiang were analyzed,as well as its impact factors.The results showed that annual solar radiation decreased obviously in Nujiang basin from 1981 to 1997,with the rate of-161.1 MJ/(m2·10 a),while it went up after 1997 at the rate of 111.3 MJ/(m2·10 a).Annual total cloud cover showed significant decrease trend with the rate of 1.8%/10 a,but annual low cloud cover increased at the rate of 3.2%/10 a.Contrary to the change trend of annual solar radiation,relative humidity rose at the increase of 3.1%/10 a from 1981 to 1997 and decreased significantly at the rate of 5.6%/10 a in 1997-2008.The change of water vapor pressure was consistent with relative humility change.Low cloud cover was the main impact factor of total solar radiation and had a negative correlation with total solar radiation.

Regional long-term trend of ground solar radiation in China over the past 50 years

Based on global solar radiation and related meteorological data from 57 stations in China between 1961 and 2009, we analyze the variation of surface global solar radiation (G) and its relationship to meteorological elements using linear-trend estimation, wavelet analysis, and the Mann-Kendall test. The results show that of the 33 stations with time series longer than 45 years, G is significant at the 95% confidence level. G has a decreasing trend at many stations, but results vary across different areas. The decadal departure percentage of G increased from the 1960s to 1970s, declined gradually after the 1970s, and decreased significantly in the 1980s. In the 1990s, the trend at a few sites slightly increased. The trend of cumulative variance is of four types, i.e. rise-fall, rise-fall-slight rise, rise-fall-rise, and not obvious. For changes within a year, the most obvious decline was in winter, and the rest of the year had a slight decrease. The major cycles of annual G were 6-9, 10-13, and 29-33 a. The inflection points were mostly in the 1970s. The reasons for greater changes were complex. Relevant meteorological elements were selected and analyzed by statistical methods. Trends in climatic parameters, such as annual average percentage of sunshine, annual average wind speed, and annual average of low cloud cover, were closely related to G. Thus, this indicated the potential causes of the observed trends in G. The long-term trend for annual G in some regions was also influenced by anthro- pogenic activities. Annual average percentage of sunshine and annual average wind speed were positively correlated with annual G, respectively.

新疆和周边“一带一路”地区不同云天条件下地表太阳辐射

基于CERES Aqua FM3 Edition4A SSF数据集,对新疆和周边“一带一路”地区2002—2022年无云和有云条件下地表太阳辐射时空变化特征进行分析。结果表明:(1)研究区多年平均太阳辐射高值区均出现在新疆南部、青藏高原、巴基斯坦中北部等地区,无云、有云条件下的最高辐照度分别为1029 W·m^(-2)、789 W·m^(-2);低值区主要出现在天山山脉、巴基斯坦北部、塔吉克斯坦北部,最低辐照度分别为117 W·m^(-2)、314 W·m^(-2),有云条件下太阳辐射的变化幅度更小。(2)2002—2022年研究区无云与有云条件的年均太阳辐射分别以0.36 W·m^(-2)、0.39 W·m^(-2)的速率增长。2003—2022年,无云与有云条件下年均辐照度的最高值分别出现在2005年(759.32 W·m^(-2))、2016年(599.70 W·m^(-2)),最低值分别出现在2016年(740.43 W·m^(-2))、2010年(578.31 W·m^(-2))。(3)无云条件下大部分区域的辐照度比有云时高100~200 W·m^(-2),差值较大的区域主要分布于天山山脉、青藏高原北部、昆仑山脉、喜马拉雅山脉、塔吉克斯坦、阿富汗东部等地势较高的地区,差值最大为505.76 W·m^(-2)。

中国太阳辐射时空变化趋势研究

近年来受雾霾、PM2.5等环境污染影响,地表太阳辐射变化剧烈。分析研究太阳辐射时空变化规律对于太阳能资源利用的部署和规划有着重要意义。本文研究基于85个太阳辐射数据监测台站数据及太阳辐射估算模型,补全了1994个台站1970—2020年的太阳辐射数据,在此基础上利用创新趋势及M-K突变检测分析了各台站的长期变化趋势及突变情况,得到了中国年、季节总太阳辐射时间变化的空间分布。结果显示:在1970—2020年间,我国的年总太阳辐射整体呈减小趋势,平均变化为-4.26 MJ/(m~2·a);西藏西部、甘肃西部及陕西中部呈现增大变化趋势,平均变化约30~105 MJ/(m~2·a);在山西、河南、山东的部分地区,减小趋势最快,约为-100~-45 MJ/(m~2·a);春季总太阳辐射呈增大趋势,平均变化为0.89 MJ/m~2,夏季总太阳辐射减小趋势最明显,平均变化为-2.40 MJ/m~2。

中国西北地区地表覆被变化对太阳辐射吸收的影响

地表覆被类型的变化会影响地表对太阳辐射能量吸收的大小,进而影响地表生态系统中辐射能量的收支平衡,在地表覆被剧烈变化的背景下,地表对太阳辐射吸收的格局和变化对地表热量收支具有重要影响。本研究基于2001—2020年间的MODIS MCD12Q1地表覆被数据、MCD43A3地表反照率数据和MCD43A2太阳天顶角数据,结合相邻2期西北地区的地表覆被类型和地表吸收太阳辐射能量的时空变化分析并探讨地表覆被类型变化对吸收太阳辐射能量的影响。结果表明:①研究区地表覆被类型变化以裸地面积减少和其他类型的扩张为主要特征,面积变化最大的是裸地向草地的转换;②不同地表覆被类型吸收太阳辐射存在差异,其中,水体最大,其次为林地、耕地、草地、建设用地,裸地、永久冰雪吸收太阳辐射较小;③地表覆被类型间转换会导致地表辐射吸收能力不同,草地、耕地、裸地、永久冰雪的转出以吸收太阳辐射增加为主导趋势,而水体和林地则以减少居多;④相同地表覆被类型其吸收太阳辐射值在时间序列上存在差异,建设用地、草地、耕地、裸地和水体以吸收增加为主,林地、永久冰雪以减少为主。本研究结果对中国西北气候变化研究、生态建设和可持续发展提供科学依据和参考。

地面太阳辐射的变化、影响因子及其可能的气候效应最新研究进展

近几十年来,全球和我国大部分区域的地面太阳辐射都经历了一个从减少到增加的过程,也就是所谓的地球"变暗"到"变亮";引起这种变化的原因复杂多样,总云量的变化无法完全解释,而气溶胶的变化则有可能在某些地区(包括中国)起着重要作用;地面太阳辐射的这种变化会产生重要的气候效应,在"变亮"的过程中有可能使温室气体的增暖效应表现得更加明显。从以上3个方面,对近几年国内外利用地面观测资料和卫星遥感资料所得到的最新研究成果进行了总结和分析,这些研究所揭示的与全球气候变化有关的基本事实也可以为我国的气候变化研究提供一定的参考和启示。

1961—2007年云南太阳总辐射时空变化特征

根据云南省7个辐射站太阳总辐射资料和113个台站日照百分率资料,建立了1961—2007年全省太阳总辐射时间序列,运用旋转主分量方法将全省分为4个区,并在此基础上研究云南太阳总辐射的时空分布和变化特征。结果表明:云南太阳总辐射呈中部多,西南部次之,东部及西北部少的分布特征。1961—2007年呈波段减少的变化趋势,线性倾向率为-0.64%/10a,其中中部及东部显著减少,西南部略有增加。其间出现两次突变,一次是1986年的显著减少,另一次是1993年以后的回升。分析表明,相对湿度和云量是影响太阳总辐射变化的主要气象因子。

榆林地区1970-2010年气候因子变化特征分析

榆林位于陕西省黄土高原和内蒙古毛乌素沙地的交接地带,是我国北方农牧交错带的典型地区,地理环境复杂多样,致使该地区生态环境比较敏感,极易受到气候变化和人类活动的影响和干扰。为探讨榆林地区气候变化的发展趋势和特征,基于1970-2010年气象资料,对榆林地区5个气象指标(平均最低气温、平均最高气温、平均气温、降水量和太阳辐射)进行空间插值,进而分析了各指标的季节和年际变化特征,即趋势变化、周期性变化、突变特征。结果表明,榆林地区气温呈现上升的趋势,春季和冬季的气温增幅对全年的增温贡献较大;降水量波动变化较大,夏季降水量减少比其他季节明显。20世纪80年代的降水量较大,90年代前期和中期降水量减少,而90年代后期降水量出现了回升趋势;41 a来的太阳辐射呈现下降的趋势,夏季太阳辐射的减少对全年太阳辐射的减少贡献较大。5个气象指标的周期性变化在大时间尺度上(如25～32 a)变化比较稳定,在小时间尺度上差异比较明显;降水量和平均最低气温在三类时间尺度(如5～15 a、15～25 a和25～30 a)上的周期比较明显。另外,除春季降水量外,其他季节的气象因子在1970-2010年期间变化频率有增加、时间间隔减少的趋势,说明最近10～20 a榆林地区气候变化比较活跃。对榆林地区气候变化特征进行分析,为进一步揭示气候变化下榆林地区农业生产系统的影响机理提供理论基础,为当地政府制定农业生产政策提供决策支持。

1961～2003年中国大陆地表太阳总辐射变化趋势

利用中国大陆30个气象站1961～2003年地表太阳总辐射观测数据,研究了辐射年总量和季节总量的变化趋势及其空间分布特征,并探讨了其原因。结果表明:1961～1989年中国大陆地表太阳总辐射总体呈减少趋势,减少约11%;1990～2003年间略有回升,但其均值仍比1961～1965年的均值低8.2%。大部分地区春夏两季减少明显,约占年减少量的55%～85%。对各站点观测数据的趋势分析表明,地表太阳总辐射随时间的变化大致可分为4种类型,其特征分别为:1961～2003年间持续减少(占总站点数20%);20世纪60年代初到80年代中期呈显著减少趋势,其后线性趋势不明显(占总站点数40%)或呈逐步增加趋势(占总站点数16.7%);1961～2003年间无显著变化(占总站点数23.3%)。这4种类型在空间分布上无明显的区域特征。日照时数减少是总辐射减少的主要原因,可以解释地表太阳辐射年总量变化的72%,日照时数随风速的增大而增加。

夏季东亚地区AOD与地面太阳辐射变化的联系及季风环流异常:季节趋势影响

利用2000—2013年MODIS-Terra卫星产品提供的气溶胶光学厚度(aerosol optical depth,AOD)资料及NCEP/NCAR再分析资料集,使用奇异值分解(singular value decomposition,SVD)方法,分析了夏季东亚地区AOD与到达地面太阳辐射(downward solar radiation flux,DSRF)相联系的主要模态,并分析了其与夏季风变化的关系。夏季多年平均的AOD分布显示,在东亚地区存在两个AOD大值区(>0.9),分别位于山东、河南、河北交界处附近以及苏中部分地区。而在福建、台湾及其附近洋面上,夏季AOD的值小于0.4。地面太阳辐射总体上呈现出由南往北递增的分布。比较发现,AOD与地面太阳辐射的气候分布较为相似。在保留季节趋势的情况下,运用SVD方法对两者进行分解,结果表明东亚地区AOD与地面太阳辐射表现出较好的正相关关系。由于相对于年际变化而言,季节趋势是更为主要的部分,因而这种同相关系可归因于季风活动的季节性进程。利用SVD1左场时间系数进行相关分析发现:6月(2013年除外),当中国东部气溶胶AOD大而地面太阳辐射亦大时,在中国东南部以及日本岛南部地区,由于气流辐合增强和存在较强的上升运动,降水偏多,而由于副高位置偏南,使得中国中东部偏北地区水汽供应偏弱,降水偏少。由于地面净太阳辐射增强,华北部分地区异常增暖。8月,大陆上空AOD为负(时间系数为负),地面太阳辐射减少,北方降水增多而南方降水减少,华北地区有一小范围的异常降温。上述结果表明北方气溶胶明显偏少时,云量增加,降水将增多,且辐射明显减弱;说明夏季风的季节进程对气溶胶、到达地面的太阳辐射变化等具有重要影响。

近年气候变化对我国不同地区供暖供冷度日数的影响

通过对覆盖不同气候区的83个站点气象数据进行系统分析,研究了不同气候区供暖供冷度日数受气候变化的影响规律。结果表明:近20年来,空气相对湿度和太阳辐照度在我国大部分地区均呈上升趋势,而气温上升现象主要出现在中部地区和东北地区;近年气候变化造成我国寒冷地区和严寒地区的供暖度日数分别以每10年4.49%和2.41%的速率下降;夏热冬冷地区的供冷度日数以每10年19.22%的速率上升,而夏热冬暖地区供冷度日数则以每10年15.36%的速率下降。

格尔木地区总辐射、反射辐射的变化特征

格尔木辐射站是青海省唯一的太阳辐射观测一级站,地处柴达木盆地,太阳总辐射及地表反射辐射均较强.1993—2011年19 a的观测结果表明:反射辐射时总量的变化规律与总辐射时总量同步,只是量值比较小,总辐射瞬时最大值为1 596 W/m2,反射辐射瞬时最大值为383 W/m2;总辐射日总量、反射辐射日总量的年变化曲线呈不规则的正弦波曲线变化过程,两者变化趋势完全一致;总辐射日总量、反射辐射日总量的年变化、年际变化与日照时数相同,说明日照时数是太阳总辐射、反射辐射的重要影响因素之一;总辐射日总量、反射辐射日总量均是夏季>秋季>春季>冬季,反射比是冬季>春季>秋季>夏季;反射比分布主要与太阳高度角的变化有关,反射比的大小取决于地面的性质和状态,地面被积雪覆盖时,各时及日反射比值明显大于晴天和土壤潮湿的时期.

基于多源数据集估算缺资料地区地表净辐射及其时空变化特征

本文以黄河源区为例,利用ITPCAS气象要素驱动数据集和GLASS地表反照率数据集,基于Penman-Monteith公式估算缺资料地区1979-2015年逐日地表净辐射(Rn),用GIS空间分析技术与Mann-Kendall趋势分析方法揭示其时间动态特征与空间演变规律。结果表明:1)对比ITPCAS气象要素驱动数据集和气象站数据估算的Rn,其相关系数均在0.98以上,均方根误差处于1.29～1.77之间;2)黄河源区年和四季Rn均呈下降趋势,每10年均降幅为-0.067MJ·m^(-2)·d^(-1),秋季降幅最小,春、冬降幅最大;黄河源区Rn年内呈单峰型,最大值出现在5月(14.31MJ·m^(-2)·d^(-1)),最小值出现在12月(3.34MJ·m^(-2)·d^(-1));3)年和各季节Rn值及变化趋势的空间分布相似;年平均Rn的大部分地区(91.6%)呈下降趋势,其中冬季Rn下降最明显,秋季Rn下降最不明显;4)黄河源区Rn在4 000～4 500m的区域内最大,而在4 500m以上最小;除了秋季Rn在3 500～4 000m区域外,其余季节在所有DEM分区中皆呈现下降趋势。

1980—2009年中国大陆中东部气溶胶-云-辐射变化及其关系

基于中国大陆中东部484个气象站1980—2009年日照时数、总云量、能见度数据,按区域分析了地表太阳辐射长期变化特征及云量和气溶胶对辐射变化的可能影响,深入理解地表太阳辐射变化趋势成因。中国大陆中东部地区地表太阳辐射呈下降趋势(-0.7 Wm-2/10a)。从季节变化分析,下降趋势主要集中于夏季(-2.7 Wm^(-2)/10a);从区域分析,下降幅度最大的为华北地区(-3.9 Wm^(-2)/10a),该区云量不明显上升、能见度明显下降,且地表太阳辐射与云量低频部分相关系数(年代际变率)约-0.25,与气溶胶低频部分相关系数达-0.87,以此推测华北地区地表辐射的长期变化是气溶胶与总云量共同作用的结果。华南地区春季辐射上升(4.2 Wm^(-2)/10a)则归因于总云量的下降(-2.1%/10a)。地表太阳辐射与总云量高频部分的相关系数(年际变率)达到-0.85以上,表明地表太阳辐射的年际短期变率主要贡献是来自于总云量的年际变化。

基于正态分布特性的太阳日总辐射数据细化

介绍了一种气候学方法计算研究地区太阳日总辐射。利用太阳辐射观测站观测到的数据拟合出代表周边地区的每日太阳辐射量变化趋势,并与该地区太阳日总辐射量相结合,得出每目各整点时刻间的太阳辐射量分布,为研究地区的光伏发电规划奠定基础。美国尤金地区的算例结果验证了本文所提方法的有效性。

邯郸太阳辐射时空分布特征

利用邯郸1980—2017年气象观测资料和河北乐亭太阳辐射观测资料,基于Hybrid radiation模型,估算邯郸近38 a太阳辐射,采用线性倾向率、突变检验、复小波分解等方法,分析邯郸太阳辐射的空间特征、线性趋势、突变和周期。结果表明:邯郸年辐射值为5 000~5 300 MJ/m2,春、夏季太阳辐射约是秋、冬季的2倍,大部分县太阳辐射资源很丰富。邯郸太阳辐射总体呈下降趋势,期间经历了连续减少、稳定维持和缓慢增长3个阶段,近10 a太阳辐射的缓慢增长主要是由春、夏季太阳辐射增加引起的。邯郸春季没有突变点,夏、秋、冬季和年序列的突变点分别为1995、1999、2001和1996年,突变年之后,下降趋势减缓。除春季外,邯郸太阳辐射存在2~4 a显著的短震荡周期。

怒江流域近30年太阳总辐射变化趋势

利用怒江流域河谷盆地的9个气象站1981～2008年的日照时数、云量、相对湿度等资料,分析了该流域太阳总辐射的时空分布、变化趋势等气候特征及其影响因子。结果表明,怒江流域年太阳总辐射1981～1997年呈明显下降趋势,为-161.1MJ/(m2.10a),1997年之后以111.3MJ/(m2.10a)的速度上升。年总云量呈显著的减少趋势,减幅为0.18成/10a;而年低云量表现出与总云量相反的变化趋势,以0.32成/10a的速度增加。相对湿度的变化趋势与年太阳辐射的趋势相反,1981～1997年以3.1%/10a的速率增加,1997～2008年为明显的减少趋势,减幅为5.6%/10a。水汽压的变化和相对湿度的变化一致。低云量是怒江流域太阳总辐射变化的主要影响因子,它与太阳总辐射存在明显的负相关关系。

基于改进的MT-CLIM模型的中高纬低山丘陵区太阳辐射模拟——以小兴安岭为例

将DEM、坡度和坡向作为地形因子,基于ENVI/IDL编写MT-CLIM模型批量处理程序,使用改进MTCLIM模型对小兴安岭地区的地面气象台站进行太阳辐射模拟,并将模拟结果分别与辐射台站实测数据和二次趋势面统计模型进行验证。研究结果表明:从整年上,其与辐射台站的拟合精度R2为0.813 3,其中,夏季模拟太阳辐射日值拟合精度偏低,而其与二次趋势面统计模型拟合精度R2值范围为0.571 3~0.793 3;采用改进的MT-CLIM模型模拟较大区域的太阳辐射,比统计模型具有更好的普适性和高效性,能获得较好的中高纬低山丘陵区模拟效果,且为森林生态过程模型的输入参数研究提供依据。