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Spatiotemporal patterns of precipitation based on the Bayesian maximum entropy method in a typical catchment of the Heihe River watershed,northwest China

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International Journal of Digital Earth 2022年第1期15卷 911-933页

作者： Hong Wang Chuanyan Zhao Fei Zang Zhanlei Rong Yapeng Chang Youyan Liu State Key Laboratory of Grassland Agro-ecosystems Key Laboratory of Grassland Livestock Industry InnovationMinistry of Agriculture and Rural AffairsCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhouPeople’s Republic of China College of Geographical Science Qinghai Normal UniversityXiningPeople’s Republic of China Academy of Plateau Science and Sustainability People’s Government of Qinghai Province & Beijing Normal UniversityXiningPeople’s Republic of China Qinghai Research Centre of Qilian Mountain National Park Qinghai Normal UniversityXiningPeople’s Republic of China

precipitation patterns are vital to water resource management and hydrological research,especially in the upper reaches of inland rivers in arid and semiarid ***,estimating spatiotemporal precipitation patterns at a basin scale is challenging due to limited *** this study,spatiotemporal patterns of precipitation amount,frequency,duration,and intensity at different time scales from 2014 to 2019 are estimated using the Bayesian maximum entropy method in the Tianlaochi catchment of the Heihe River watershed,northwest *** study's results show that the annual average precipitation amount was 535.9 mm from 2014 to 2019,with precipitation amount between May and September accounting for 85.9%of the annual precipitation *** daily precipitation,the average frequency rate of light precipitation is highest at 59.55%,however,the average contribution rate of moderate precipitation is highest at 50.33%.The spatial distribution of precipitation is characterized by high-value areas concentrated in the central valley and low-value areas located at the catchment's *** most important driving factors of precipitation patterns are elevation,relative humidity,and wind *** outcomes can be used to establish accurate hydrological models in the catchment and provide support for water resource management in the Heihe River watershed.

关键词： Geostatistics precipitation patterns spatial estimation cross-validation grey relational analysis

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Review on the Impact of Climate Change on Great Lakes Region’s Agriculture and Water Resources

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Journal of Geoscience and Environment Protection 2024年第7期12卷 165-176页

作者： Zeyu Shen College of Liberal Arts and Science Environmental Sciences University of Iowa Iowa City USA

This study investigates the multifaceted impacts of climate change on the Midwest region of the United States, particularly the rising temperatures and precipitation brought about by hot weather activities and technological advances since the 19th century. From 1900 to 2010, temperatures in the Midwest rose by an average of 1.5 degrees Fahrenheit, which would also lead to an increase in greenhouse gas emissions. precipitation is also expected to increase due to increased storm activity and changes in regional weather patterns. This paper explores the impact of these changes on urban and agricultural areas. In urban areas such as the city of Chicago, runoff from the increasing impervious surface areas poses challenges to the drainage system, and agriculture areas are challenged by soil erosion, nutrient loss, and fewer planting days due to excessive rainfall. Sustainable solutions such as no-till agriculture and the creation of grassland zones are discussed. Using historical data, recent climate studies and projections, the paper Outlines ways to enhance the Midwest’s ecology and resilience to climate change.

关键词： Climate Change Midwest USA Agricultural Impacts Urban Runoff Sustainable Practices precipitation patterns Temperature Increase Greenhouse Gas Emissions Soil Erosion Water Management

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A New precipitation Index for the Spatiotemporal Distribution of Drought and Flooding in the Reaches of the Yangtze and Huaihe Rivers and Related Characteristics of Atmospheric Circulation

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Advances in Atmospheric Sciences 2011年第2期28卷 375-386页

作者：宗海锋张庆云 Institute of Atmospheric Physics Chinese Academy of Sciences State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences

Characteristics of the spatiotemporal distributions of precipitation anomalies in the reaches of the Yangtze River and Huaihe River （YHR） were studied using EOF method. Four main precipitation pat-terns for the YHR in summer identified by the first two modes： a region-wide flood over the entire YHR （RWF）; a region-wide drought over the entire YHR （RWD）; a flood in the south with a drought in the northern region of the Yangtze River （FS-DN）; and a drought in the south with a flood in the northern region of the Yangtze River （DS-FN）. Based on the first two modes and the actual precipitation departure percentage, a new precipitation index is defined in this paper. The typical flood/drought years associated with the various rainfall patterns defined by this precipitation index are more representative and closer to reality compared to some existing precipitation indexes which just use the area-mean precipitation or the EOF time components individually. The characteristics of atmospheric circulation in summer corresponding to the four main precipitation patterns over the YHR in summer show the features of atmospheric circulation differ in different precipitation pattern years. Although the different patterns share a common main influential circulation system, such as the blocking high over northeastern Asia, the low trough of westerly flows in the mid latitudes, the West Pacific Subtropical High （WPSH）, and the high ridge over the Tibet Plateau, the difference in location and intensity of these systems can lead to different distributions of precipitation anomalies.

关键词： reaches of Yangtze River and Huaihe River precipitation index precipitation patterns

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precipitation amount and frequency affect seedling emergence and growth of Reaumuria soongarica in northwestern China

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Journal of Arid Land 2018年第4期10卷 574-587页

作者： SHAN Lishan ZHAO Wenzhi LI Yi ZHANG Zhengzhong XIE Tingting Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences College of Forestry Gansu Agricultural University

Climate change is shifting the amount and frequency of precipitation in many regions, which is expected to affect seedling recruitment across ecosystems. However, the combined effects of precipitation amount and frequency on seedling recruitment remain largely unknown. An understanding of the effects of precipitation amount and frequency and their interaction on seedling emergence and growth of typical desert plants is vital for managing populations of desert plants. We conducted two experiments to study the effects of variation in precipitation on Reaumuria soongarica （Pall.） Maxim. First, greenhouse experiments were conducted to examine the effects of three precipitation amount treatments （ambient, ＋30%, and -30%） and two precipitation frequency treatments （ambient and -50%） on seedling emergence. Second, the morphological responses of R. soongarica to changes in precipitation amount and frequency were tested in a controlled field experiment. Stage-specific changes in growth were monitored by sampling in different growth seasons. Our results showed that precipitation amount significantly affected germination, seedling emergence, and growth of R. soongarica, and there was a larger effect with decreased precipitation frequency compared with ambient. Germination and seedling emergence increased as precipitation increased under the same frequency of precipitation. The highest emergence percentage was obtained with a 30% increase in precipitation amount and a 50% reduction in precipitation frequency. Compared with ambient precipitation, a 30% increase in precipitation amount increased above- and below-ground biomass accumulation of R. soongarica during the growth season. A decrease of 30% in precipitation amount also resulted in an increase in below-ground biomass and root/shoot ratio in the early stages of the growth season, however, above- and below-ground biomass showed the opposite results at the end of the growth season, with larger effects on above-ground than be

关键词： precipitation patterns seedling emergence biomass root/shoot ratio seedling recruitment

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中国西南-东南季风交汇区降水时空格局变化及其对食物产量的影响--以云南省为例

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Journal of Geographical Sciences 2021年第10期31卷 1490-1506页

作者：刘志林丁银平角媛梅 Faculty of Geography Yunnan Normal UniversityKunming 650500China

Following climate change,changes in precipitation patterns and food security are major challenges faced by ***,research on how these changes in precipitation pattern impacts food supply is *** study aims to elucidate this impact and response mechanisms using precipitation data of a climate change-sensitive confluence zone of the southwest and southeast monsoons in Yunnan Province from 1988 to *** results revealed that the precipitation pattern could be divided into three periods:abundant precipitation(Stage I,from 1988 to 2004),decreased precipitation(Stage II,from 2005 to 2015),and drought recovery(Stage III,from 2016 to 2018).Following the transition from Stage I to Stage II and from Stage II to Stage III,the area of precipitation changed significantly,accounting for 15.07%,13.87%,and 16.53%of Yunnan’s total area,for Stages I,II,and III,*** the provincial level,a significant positive correlation was observed between precipitation and food production(r=0.535,Pprecipitation and grain yield was higher than that between precipitation and meat and milk *** on a precipitation–grain yield transect and breakpoint detection method,key precipitation thresholds affecting grain yield were estimated as 700 and 1500 mm,respectively;when precipitation wasprecipitation and grain yield were 0.448(P0.05),*** on the precipitation thresholds,Yunnan Province can be divided into precipitation surplus,precipitation equilibrium,and precipitation deficit regions,corresponding countermeasures to stabilize grain yield were proposed for each of these *** threshold effect of precipitation on grain yield is controlled by molecular-level water–crop mechanisms,in which reactive oxygen species,a by-product of plant aerobic metabolism,plays a key regulatory role.

关键词： monsoon confluence region precipitation patterns food supply influencing mechanisms Yunnan Province

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