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- Chen, Tao, et al.
(författare)
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Comprehensive applicability evaluation of multi-source snow depth datasets over the Tibetan Plateau
- 2022
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Ingår i: Journal of Glaciology and Geocryology. - 1000-0240. ; 44:3, s. 795-809
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Tidskriftsartikel (refereegranskat)abstract
- Snow cover over the Tibetan Plateau has an important impact on the regional climate and water cycle. At present, the existing snow cover datasets have great uncertainty across this region, so the applicability assessment is indispensable in order to make best use of the advantages and bypass the disadvantages. In this study, a comprehensive quantitative evaluation of multiple variables and multiple evaluation indicators was carried out for three snow depth datasets over the Tibetan Plateau against the meteorological station observations（OBS）. The three snow depth datasets include one passive microwave remote sensing dataset（CHE）and two reanalysis datasets（ERA5-Land and MERRA2）. The variables are the annual mean snow depth, the annual maximum snow depth, and the annual snow cover days. In addition, the evaluation indicators are seasonal cycle, climatology, maximum value, standard deviation, interannual variation, and trend. A rank score（RS）value of 0~1 is computed for each evaluation indicator of each variable, the larger value of RS indicate relatively better performance of a snow depth dataset. Assessment results imply that, comprehensively considered, MERRA2 exhibits best agreement with OBS, followed by ERA5-Land, and finally CHE. Evaluate based on the RS of each variable, MERRA2 shows better performance on annual maximum snow depth and annual snow cover days, CHE shows better performance on annual mean snow depth. Evaluate based on the RS of each evaluation indicator, CHE shows advantages in describing trend, ERA5-Land exhibits better agreement with OBS on interannual variation, and MERRA2 show better performance on the rest of the indicators including seasonal cycle, climatology, maximum value and standard deviation. The RS statistics in terms of regional average and spatial distribution show that CHE performs better in the former, and ERA5-Land performs better in the latter. On the other hand, there are obvious deficiencies in all three snow depth datasets. MERRA2 has insufficient ability to characterize the interdecadal variation in snow cover, and its qualitative results for trend in snow cover is inconsistent with OBS, the reason for the first deficiency needs to be further studied and the second deficiency may be mainly related to its simulation capability to precipitation trend. ERA5-Land significantly overestimates the snow cover over the Tibetan Plateau, this may be mostly related to its data assimilation scheme. CHE has poor ability to characterize the spatial distribution of snow cover, coarse spatial resolution of passive microwave remote sensing may be the main reason. The conclusions are only applicable to the central and eastern part of the Tibetan Plateau due to the scarcity of meteorological station in west part of the Tibetan Plateau. Based on the remote sensing and reanalysis data, there is great uncertainty in the trend of snow cover in the western part of the Tibetan Plateau. These systematic classification evaluation of the three representative snow depth datasets provides information on data selection and data refinement.
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- Chen, Xiaochen, 1984, et al.
(författare)
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South Pacific Developmental Regionalism: Concept, Characteristics and Progress
- 2019
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Ingår i: The Journal of South China Sea Studies. - 2096-0166. ; 5:4, s. 100-109
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Tidskriftsartikel (refereegranskat)abstract
- Developmental regionalism is a combination of the frontier theory of regionalism and the practice of regionalism in developing countries. It also reflects China's Views on Global Governance, in particular supporting expanding representation and voice of developing countries in international affairs. This paper studies the general concept of developmental regionalism and its uniqueness in the South Pacific Region (SPR). By taking the new developments of South Pacific regionalism in the new era as case studies, the paper investigates how the connotation of developmental regionalism and the characteristics of the South Pacific shape the core features of the developmental regionalism in the South Pacific beyond regional integration, trade issues and purely economic development, focusing on regional collective diplomacy with oceanic characteristics, in particular in the issues concerning the South Pacific such as climate change and fisheries and ocean governance, which works for generalized regional development rights.
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- Guo, Yanfei, 1984, et al.
(författare)
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Frailty trajectories in people aged 50 years and above in China
- 2022
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Ingår i: Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi. - 0254-6450. ; 43:11, s. 1711-1716
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Tidskriftsartikel (refereegranskat)abstract
- 目的： 识别中国≥50岁人群的衰弱轨迹，并探索相关影响因素。 方法： 采用WHO“全球老龄化与成人健康研究”（SAGE）中国项目第一至第三轮纵向数据，由32种变量计算衰弱指数得分，并在此基础上在组基轨迹模型中采用删失正态模型确定随时间变化的衰弱轨迹模式，采用多项式logistic回归模型研究社会经济地位和行为影响因素对衰弱轨迹的影响。 结果： 共纳入4 303名≥50岁且拥有3轮完整数据的调查对象进入分析，本研究识别出3条衰弱轨迹：低水平稳定轨迹（LT）、中度增加轨迹（MT）和高度增加轨迹（HT），分别占所有调查对象的75.9%，19.1%和5.0%。多项式logistic回归分析的结果显示，与LT组相比，HT组更倾向是女性（OR=1.88，95%CI：1.22~2.92）和农村居民（OR=1.87，95%CI：1.29~2.70）。在家庭人均财富方面，OR值有一个明显的梯度，较低的家庭财富更有可能归为HT组。 结论： 本研究识别出了3种我国≥50岁人群衰弱轨迹的进展模式，并强调了干预措施应尽可能地以那些衰弱进展快速的脆弱人群为目标。. Objective: To identify distinct frailty trajectories in a cohort of nationwide community adults aged 50 years and above, and explore the relationship between frailty trajectories and their socioeconomic characteristics and behavioral factors at baseline survey. Methods: Data were from the three waves of "Global Ageing and Adult Health Research" (SAGE) by World Health Organization in China. The frailty index is generated from 32 items. Group-based trajectory modeling using a censored normal model was conducted to identify the patterns in frailty progression over time. Multinomial logistic regression model was used to examine the effect of socioeconomic status and behavioral factors on the frailty trajectories. Results: A total of 4 303 adults aged 50 years and above with complete data from all three rounds of project were included in the final analysis. Three frailty trajectories were identified: low and stable trajectory (LT) (56.8%), moderately increased trajectory (MT) (34.4%) and highly increased trajectory (HT) (8.8%). The results of the multinomial logistic regression analysis showed that the HT group was more likely to be women (OR=1.88, 95%CI:1.22-2.92) and rural residents (OR=1.87, 95%CI:1.29-2.70) compared with the LT group. In terms of household wealth per capita, there was a clear gradient in ORs, the people with lower household wealth were more likely to be classified in the HT group. Conclusion: This study identified three patterns of progression of frailty trajectories in population aged 50 years and above in China and highlighted that interventions should target those vulnerable populations with rapid progression of frailty.
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- Gustafsson, Björn, 1948, et al.
(författare)
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Changes in household income and poverty in urban China
- 2020
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Ingår i: Research on China’s Income Distribution and Labor Market (Vol.10, Ch.10). - Beijing, P.R. China : China Human Resources & Social Security Publishing Group Co., Ltd. - 9787516743119 ; , s. 203-223
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