Century-Long Variations in Surface Incident Solar Radiation Over Japan——Characterized by Observations and Reanalyses

IF 3.5 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Qian Ma, Han Liu
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引用次数: 0

Abstract

Surface incident solar radiation (R s ) is of great importance in determining the energy balance in the Earth system. In this study, we use century-long homogenized observations over Japan to constrain five 20th century reanalyses to explore their performance in reproducing R s variation on different time scales (high-frequency components [HFCs], for signals with cycles less than 10 years; low-frequency components [LFCs], for signals with cycles more than 10 years) by ensemble empirical mode decomposition (EEMD) method and to quantify the impact factors on the R s estimations by the sum of tree (SOT) model. It is found that ERA20C, ERA20CM and CERA20C overestimated R s by 0.48–1.49 W/m−2, while 20CRv2c and 20CRv3 underestimated R s by −0.63 and −1.18 W/m−2, respectively for 1931–2010. Poor correlation coefficient (R) was found to be 0.10 for ERA20CM and 0.22 for 20CRv2c. 20CRv2c failed for 1931–1960 but improved considerably for 1961–2010. 20CRv3 uses an upgraded model and assimilates more observations compared with its predecessor 20CRv2c; however, only the original components and HFCs in R s were improved, with nearly no improvement in the LFCs. In general, CERA20C R s , with small biases and higher R of 0.73 for original signals, 0.83 for HFCs and LFCs, is superior to other reanalyses. No obvious trend in clear sky R s demonstrated that reanalysed R s are insensitive to the aerosol forcings. Therefore, cloud cover and water vapour maybe the main factors influenced reanalysed R s . Most of time, R s is more sensitive to cloud cover than vapour pressure for all reanalyses except original signals (with contribution ratio of 0.29 for cloud cover and 0.71 for vapour pressure) and LFCs (with contribution ratio of 0.41 for cloud cover and 0.59 for vapour pressure) in CERA20C, and original signals (with contribution ratio of 0.37 for cloud cover and 0.63 for vapour pressure) in ERA20C. This work pointed out that aerosol related processes such as aerosol forcings or aerosol radiative effect in reanalyses should be improved in the future, which will ultimately improve the interaction between aerosol and cloud in R s simulations.

Abstract Image

日本地表入射太阳辐射的百年变化——以观测和再分析为特征
地表入射太阳辐射(R s)对确定地球系统的能量平衡具有重要意义。在这项研究中,我们使用日本的百年均质观测来约束5次20世纪再分析,以探索它们在不同时间尺度(高频成分[HFCs])上再现R s变化的性能,对于周期小于10年的信号;利用集合经验模态分解(EEMD)方法对周期大于10年的信号进行低频分量分析,并利用树和(SOT)模型对R s估计的影响因子进行量化。研究发现,ERA20C、ERA20CM和CERA20C对R s的高估幅度为0.48 ~ 1.49 W/m−2,而20CRv2c和20CRv3对R s的低估幅度分别为- 0.63和- 1.18 W/m−2。ERA20CM和20CRv2c的低相关系数(R)分别为0.10和0.22。20CRv2c在1931-1960年失败了,但在1961-2010年有了很大的改进。20CRv3采用升级后的模型,与之前的20CRv2c相比,吸收了更多的观测数据;然而,只有R中的原始成分和hfc得到改善,lfc几乎没有改善。总的来说,CERA20C R s的偏差较小,对原始信号的R值较高,为0.73,对hfc和lfc的R值为0.83,优于其他再分析。晴空rs无明显变化趋势,表明重新分析的rs对气溶胶强迫不敏感。因此,云量和水蒸气可能是影响重分析rs的主要因素。除了CERA20C的原始信号(云量贡献比为0.29,蒸气压贡献比为0.71)和lfc(云量贡献比为0.41,蒸气压贡献比为0.59)和ERA20C的原始信号(云量贡献比为0.37,蒸气压贡献比为0.63)外,大多数情况下,rs对云量的再分析比蒸汽压更敏感。这一工作指出,在未来的再分析中,气溶胶相关过程如气溶胶强迫或气溶胶辐射效应等应得到改进,这将最终改善rs模拟中气溶胶与云之间的相互作用。
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来源期刊
International Journal of Climatology
International Journal of Climatology 地学-气象与大气科学
CiteScore
7.50
自引率
7.70%
发文量
417
审稿时长
4 months
期刊介绍: The International Journal of Climatology aims to span the well established but rapidly growing field of climatology, through the publication of research papers, short communications, major reviews of progress and reviews of new books and reports in the area of climate science. The Journal’s main role is to stimulate and report research in climatology, from the expansive fields of the atmospheric, biophysical, engineering and social sciences. Coverage includes: Climate system science; Local to global scale climate observations and modelling; Seasonal to interannual climate prediction; Climatic variability and climate change; Synoptic, dynamic and urban climatology, hydroclimatology, human bioclimatology, ecoclimatology, dendroclimatology, palaeoclimatology, marine climatology and atmosphere-ocean interactions; Application of climatological knowledge to environmental assessment and management and economic production; Climate and society interactions
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