染雾Variations of Meiyu Indicators in the Yangtze River Basin: A Comparative Analysis
篇一：Variations of Meiyu Indicators in the Yangtze River Basin: A Comparative Analysis
Introduction:
The Meiyu season, also known as the plum rain season, is a critical period of intense rainfall in the East Asia region, particularly in the Yangtze River Basin. This rainy season plays a vital role in the region's water resources, agriculture, and overall climate. Understanding the variations of Meiyu indicators is crucial for predicting and managing the impacts of this climatic phenomenon. In this article, we will analyze the variations of Meiyu indicators in the Yangtze River Basin and explore their implications.
1. Definition and Characteristics of Meiyu Indicators:
Meiyu indicators are specific meteorological parameters used to identify and characterize the Meiyu season. These indicators include precipitation amount, onset and withdrawal dates, duration, intensity, and spatial distribution of rainfall. They serve as valuable tools for understanding the spatiotemporal patterns of the Meiyu season and its impacts on the region.
2. Historical Analysis of Meiyu Indicators:
By analyzing historical climate data, researchers have identified significant variations in Meiyu indicators over the years. The onset and withdrawal dates of the Meiyu season have shown a delayed trend in recent decades. Additionally, the duration of the Meiyu season has been observed to be shorter, while the intensity and spatial distribution of rainfall have exhibited increasing variability. These variations have important implications for water resources management, agriculture, and flood control in the Yangtze River Basin.
3. Causes of Variations in Meiyu Indicators:
Several factors contribute to the variations in Meiyu indicators. Climate change, including global warming, has been identified as a significant driver of these variations. Changes in atmospheric circulation patterns, such as the East Asian summer monsoon, can also influence the onset, duration, and intensity of the Meiyu season. Additionally, land-use changes and urbanization in the Yangtze River Basin may further exacerbate these variations.
4. Implications for Water Resources and Agriculture:
The variations in Meiyu indicators have profound implications for water resources and agriculture in the Yangtze River Basin. The delayed onset and withdrawal of the Meiyu season can disrupt the water supply for irrigation, affecting crop growth and agricultural productivity. The shorter duration of the Meiyu season may lead to water shortages in the region, particularly during the dry season. The increasing variability of rainfall intensity and spatial distribution can result in both droughts and floods, posing challenges for water management and flood control.
Conclusion:
The variations of Meiyu indicators in the Yangtze River Basin have significant implications for water resources, agriculture, and climate in the region. Understanding these variations and their underlying causes is crucial for effective water management, agricultural planning, and adaptation strategies. Further research and monitoring of Meiyu indicators are necessary to develop accurate predictions and sustainable solutions for mitigating the impacts of this critical climatic phenomenon.
Variations of Meiyu Indicators in th 篇三
Variations of Meiyu Indicators in the Yangtze-Huaihe River Basin during 1954-2003
To better understand climate variations of Meiyu, some new indicators for the onset and retreat dates,duration, and Meiyu precipitation in the Yangtze-Huaihe River valley are objectively developed by using observed daily precipitation data from 230 stations in eastern China during 1954-2003.The rainy season onset and retreat dates in each station can be defined in terms of thresholds for rainfall intensity and persistence. Then, the onset and retreat dates of the Meiyu for the Yangtze-Huaihe River basin have been determined when more than 40% of stations reach the first rainy season thresholds in the study region.Based on the indicators of Meiyu in the Yangtze-Huaihe River basin, variations of Meiyu rainfall during 1954-2003 are analyzed. The results suggest that Meiyu rainfall in the Yangtze-Huaihe River basin has increased in recent 50 years. In addition, interannual and interdecadal variability of Meiyu is also obvious.All the indicators display a predominant period of about 3 years.
作 者： ZHANG Yanxia ZHAI Panmao QIAN Yongfu 作者单位： ZHANG Yanxia,QIAN Yongfu(Department of Atmospheric Sciences, Nanjing University, Nanjing 210093)ZHAI Panmao(National Climate Center, Beijing 100081)
刊 名：气象学报（英文版） SCI 英文刊名： ACTA METEOROLOGICA SINICA 年，卷(期)： 200
