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Your search keyword '"Hu, Zengyun"' showing total 35 results
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35 results on '"Hu, Zengyun"'

1. Constraining the global mean surface temperature during 1850-1880 with new statistical physical model

Author

Li, Qingxiang, Li, Zichen, Li, Xuqian, Hu, Zengyun, Dai, Aiguo, Dong, Wenjie, Huang, Boyin, Jiang, Zhihong, Zhai, Panmao, Zhou, Tianjun, and Jones, Phil

Subjects
Physics - Atmospheric and Oceanic Physics
Abstract

As IPCC ARs stated, global warming is estimated based on the average from 1850 to 1900 (global average temperature of preindustrialization estimated from relatively sparse observations). Given the impossibility of massive increasing observation data in the early stages, accurately constraining this baseline has become an unresolved issue. Here we developed a new statistical physical model to quantify the contribution of external forcings to global warming as a "deterministic trend" of the surface temperature series (instead of as non-stationary processes that yield a stochastic trend) and constrained the reconstruction of the early time series (1850-1880). We find that the existing datasets slightly overestimated the temperature anomalies in this period, thus the speed of global warming since pre-industrialization is still underestimated.

Published
2023

8. A Unified System for Evaluating, Ranking and Clustering in Diverse Scientific Domains.

Author

Hu, Zengyun, Chen, Xi, Chen, Deliang, Zhang, Zhuo, Zhou, Qiming, and Li, Qingxiang

Subjects
*EUCLIDEAN distance, *GEOGRAPHY
Abstract

Evaluating, ranking, and clustering (ERC) stand as fundamental tasks in scientific research, each requiring a mathematical foundation. This study presents an ERC system anchored in the CCHZ-DISO (Chen, Chen, Hu, and Zhou-Distance between Indices of Simulation and Observation) system. Previous research underscores the optimality achieved by the CCHZ-DISO system (Hu et al., 2022). Since the inception of CCHZ- DISO-series research by Hu et al. (2019), DISO has found extensive applications across various domains including geography, hydrology, and economics. Analogous to the CCHZ-DISO system's construction, the ERC system employs the Euclidean distance to perform evaluating, ranking, and clustering tasks. Furthermore, illustrative examples are provided to elucidate the application of the ERC system. In fact, the ERC system unified the evaluating, ranking, and clustering tasks in one simple equation which is more flexible and simpler than the present system. It will have a more widely application than CCHZ-DISO in diverse scientific domains. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Dynamic Changes of Terrestrial Water Cycle Components over Central Asia in the Last Two Decades from 2003 to 2020.

Author

Odinaev, Mirshakar, Hu, Zengyun, Chen, Xi, Mao, Min, Zhang, Zhuo, Zhang, Hao, and Wang, Meijun

Subjects
*HYDROLOGIC cycle, *WATER management, *RESOURCE exploitation, *WATER withdrawals, *ARID regions
Abstract

The terrestrial water cycle is important for the arid regions of central Asia (CA). In this study, the spatiotemporal variations in the three climate variables [temperature (TMP), precipitation (PRE), and potential evapotranspiration (PET)] and terrestrial water cycle components [soil moisture (SM), snow water equivalent (SWE), runoff, terrestrial water storage (TWS), and groundwater storage (GWS)] of CA are comprehensively analyzed based on multiple datasets from 2003 to 2020. The major results are as follows: (1) Significant decreasing trends were observed for the TWS anomaly (TWSA) and GWS anomaly (GWSA) during 2003–2020, indicating serious water resource depletion. The annual linear trend values of TWSA and GWSA are −0.31 and −0.27 mm/a, respectively. The depletion centers are distributed over most areas of western and southern Kazakhstan (KAZ) and nearly all areas of Uzbekistan (UZB), Kyrgyzstan (KGZ), and Tajikistan (TJK). (2) TMP and PET have the largest significant negative impacts on SM and SWE. The PRE has a positive impact on terrestrial water variations. (3) During 1999–2019, water withdrawal did not significantly increase, whereas TWS showed a significant decreasing trend. Our results provide a comprehensive analysis of the basic TWS variation that plays a significant role in the water resource management of CA. [ABSTRACT FROM AUTHOR]

Published
2023
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27. Transmission Risk Prediction and Evaluation of Mountain-Type Zoonotic Visceral Leishmaniasis in China Based on Climatic and Environmental Variables

Author

Hao, Yuwan, primary, Luo, Zhuowei, additional, Zhao, Jian, additional, Gong, Yanfeng, additional, Li, Yuanyuan, additional, Zhu, Zelin, additional, Tian, Tian, additional, Wang, Qiang, additional, Zhang, Yi, additional, Zhou, Zhengbin, additional, Hu, Zengyun, additional, and Li, Shizhu, additional

Published
2022
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35. Modeling and analysis of the transmission dynamics of cystic echinococcosis: Effects of increasing the number of sheep.

Author

He Y, Cui Q, and Hu Z

Subjects
Animals, Sheep, Dogs, Basic Reproduction Number, Uncertainty, Echinococcosis epidemiology, Echinococcosis veterinary
Abstract

A transmission dynamics model with the logistic growth of cystic echinococcus in sheep was formulated and analyzed. The basic reproduction number was derived and the results showed that the global dynamical behaviors were determined by its value. The disease-free equilibrium is globally asymptotically stable when the value of the basic reproduction number is less than one; otherwise, there exists a unique endemic equilibrium and it is globally asymptotically stable. Sensitivity analysis and uncertainty analysis of the basic reproduction number were also performed to screen the important factors that influence the spread of cystic echinococcosis. Contour plots of the basic reproduction number versus these important factors are presented, too. The results showed that the higher the deworming rate of dogs, the lower the prevalence of echinococcosis in sheep and dogs. Similarly, the higher the slaughter rate of sheep, the lower the prevalence of echinococcosis in sheep and dogs. It also showed that the spread of echinococcosis has a close relationship with the maximum environmental capacity of sheep, and that they have a remarkable negative correlation. This reminds us that the risk of cystic echinococcosis may be underestimated if we ignore the increasing number of sheep in reality.

Published
2023
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