A Review of Assessment and Adaptation Strategy to Climate Change Impacts on the Coastal Areas in South China

This paper reviews assessment of climate change impacts on economy,society and ecological environment in the coastal areas of South China based on published literatures;it also proposes suitable adaptation strategies and countermeasures.Review shows that climate change has resulted in sea level rise in the coastal areas of South China,increasing the occurrence and intensity of storm surges,aggravating the influence of saltwater intrusion,coastal erosion,urban drainage and flood control,threatening the coastal facility and infrastructures,inundating lowland areas,ofsetting mudflat silting,and degrading mangroves and coral reef ecosystem.Therefore,in order to reduce the adverse efects of climate change and to support the sustainable development in the coastal areas of South China,it is critical to improve the monitoring and early warning system,enhance prevention criteria,fortify coastal protection engineering,strengthen salt tide prevention,and reinforce the ecological restoration and protection.

Impacts of Climate Change on Human Health and Adaptation Strategies in South China

This study reviews the impacts of climate change on human health and presents corresponding adaptation strategies in South China.The daily mean surface air temperatures above or below 26.4 C increase the death risk for the people in Guangzhou,especially the elderly are vulnerable to variations in temperature.Heat waves can cause insomnia,fatigue,clinical exacerbation,or death from heatstroke etc.,while cold spells show increases in patients with fractures.During a cold spell period,the rates of both on-site emergency rescues and non-implementable rescues increase,and the risk of non-accidental deaths and respiratory disease deaths significantly rise as well.Both time series of hazy days and ozone concentrations have significant positive correlations with the number of patients with cardiovascular diseases.Both malaria and dengue fever reach higher altitudes and mountainous areas due to climate warming.Climate change is likely to bring stronger heat waves in the future,thereby increasing heat wave-related illnesses and deaths,particularly in the metropolitan areas of the Pearl River Delta.The projected increase of continuous cold days in Guangdong province and parts of northern Guangxi province will afect residents’health in the future.The rising temperature exaggerates ozone pollution,but it is not clear whether climate change is aggravating or mitigating haze pollution.The transmission potential of malaria in South China will increase by 39%–140%and the transmission season will extend by 1–2 months with an air temperature increase of 1–2 C.By 2050,most areas in Hainan province are projected to convert from non-endemic dengue into endemic dengue areas.The aging population will cause more vulnerable people.To mitigate the adverse impacts of climate change on human health,sound and scientific adaptation strategies must be adopted in advance,such as strengthening the surveillance of epidemic diseases in potential transmission areas,conducting timely weather forecasting for human health,evaluating health vulnerability to climate change,improving environmental and health education,and strengthening hazard management and the cooperation between meteorological and health departments.

Changes in Climate Factors and Extreme Climate Events in South China during 1961-2010

Daily climate data at 110 stations during 1961-2010 were selected to examine the changing characteristics of climate factors and extreme climate events in South China. The annual mean surface air temperature has increased significantly by 0.16℃ per decade, most notably in the Pearl River Delta and in winter. The increase rate of the annual extreme minimum temperature (0.48℃ per decade) is over twice that of the annual extreme maximum temperature (0.20℃ per decade), and the increase of the mean temperature is mainly the result of the increase of the extreme minimum temperature. The increase rate of high-temperature days (1.1 d per decade) is close to the decrease rate of low-temperature days (-1.3 d per decade). The rainfall has not shown any significant trend, but the number of rainy days has decreased and the rain intensity has increased. The regional mean sunshine duration has a significant decreasing trend of -40.9 h per decade, and the number of hazy days has a significant increasing trend of 6.3 d per decade. The decrease of sunshine duration is mainly caused by the increase of total cloud, not by the increase of hazy days in South China. Both the regional mean pan evaporation and mean wind speed have significant decreasing trends of -65.9 mm per decade and -0.11 m s-1 per decade, respectively. The decrease of both sunshine duration and mean wind speed plays an important role in the decrease of pan evaporation. The number of landing tropical cyclones has an insignificant decreasing trend of -0.6 per decade, but their intensities show a weak increasing trend. The formation location of tropical cyclones landing in South China has converged towards 10-19°N, and the landing position has shown a northward trend. The date of the first landfall tropical cyclone postpones 1.8 d per decade, and the date of the last landfall advances 3.6 d per decade, resulting in reduction of the typhoon season by 5.4 d per decade.

东南亚华人华侨网络与中国企业海外投资的区位选择关系研究（英文）

With the implementation of the 'Going out' strategy and the Belt and Road Initiative, China’s investments have become increasingly influential in the global market. The contemporary literature has revealed how overseas Chinese networks and communities have actively promoted foreign investments into China over the past four decades. Whether this factor can help Chinese capital flow out once again is still ambiguous. This study examines this question by investigating Chinese corporate investments in Southeast Asia from 2001 to 2016. Through the discrete-selection logistic regression model, the study analyzes the correlation between overseas Chinese social networks and the location choices of Chinese corporate investments. The results show the following:(1) overall, there is a significant positive correlation between the population of overseas Chinese in Southeast Asian countries and the location choices of Chinese corporate investments;(2) in terms of the time sequence, the significance of the correlation is increasing, which implies that overseas Chinese have positive impacts on promoting the location choice of Chinese enterprises and that the impact is potentially increasing;and(3) in terms of the industrial structure and corporate functions, the impacts vary and are only significant in some industries and corporate segments.

Re-examining urban region and inferring regional function based on spatial-temporal interaction

Urban system is shaped by the interactions between different regions and regions planned by the government,then reshaped by human activities and residents’needs.Understanding the changes of regional structure and dynamics of city function based on the residents’movement demand are important to evaluate and adjust the planning and management of urban services and internal structures.This paper constructed a probabilistic factor model on the basis of probabilistic latent semantic analysis and tensor decomposition,for purpose of understanding the higher order interactive population mobility and its impact on urban structure changes.First,a four-dimensional tensor of time(T)×week(W)×origin(O)×destination(D)was constructed to identify the day-to-day activities in three time modes and weekly regularity of weekday/weekend pattern.Then we reclassified the urban regions based on the space clustering formed by the space factor matrix and core tensor.Finally,we further analysed the space–time interaction on different time scales to deduce the actual function and connection strength of each region.Our research shows that the application of individual-based spatial–temporal data in human mobility and space–time interaction study can help to analyse urban spatial structure and understand the actual regional function from a new perspective.