Shiori Sugimoto, Sachiho A. Adachi, Rui Ito, Chieko Suzuki
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引用次数: 0
Abstract
To identify and characterize the synoptic-scale precipitation systems causing widespread heavy precipitation events over Japan and to evaluate their possible future changes, annual maximum of area-averaged daily and 5-day accumulated precipitation for 720 years were analyzed for both historical and 4 K warming climates using a large ensemble dataset with 5 km horizontal resolution. According to statistical cluster analysis, the approach of tropical cyclones is the primary factor causing widespread heavy precipitation events in both the historical and 4 K warming experiments, although the Baiu front and migratory extratropical cyclones also contribute to event occurrence. The frequency of tropical-cyclone-associated events is lower in the 4 K warming climate compared with the historical experiment because the occurrence frequency of tropical cyclones is lower over the western North Pacific. The decrease in frequency of tropical-cyclone-associated events leads to a relative increase in the frequency of events associated with other precipitation systems (i.e., the Baiu front and migratory extratropical cyclones) under the warming climate. The anomalous moisture supply in the 4 K warming experiment causes the widespread heavy precipitation derived from the Baiu front and migratory extratropical cyclones to intensify to reach a magnitude comparable to that of historical-climate tropical-cyclone-associated events.
为了确定造成日本上空大范围强降水事件的同步尺度降水系统及其特征,并评估其未来可能发生的变化,利用水平分辨率为 5 公里的大型集合数据集,分析了历史气候和 4 K 暖化气候下 720 年的年最大区域平均日降水量和 5 天累计降水量。根据统计聚类分析,在历史气候和 4 K 升温实验中,热带气旋的逼近是造成大范围强降水事件的主要因素,尽管白云前线和迁移性外热带气旋也对事件的发生有影响。与历史实验相比,4 K 暖化气候中热带气旋相关事件的发生频率较低,这是因为热带气旋在北太平洋西部的发生频率较低。在气候变暖的情况下,热带气旋相关事件发生频率的降低导致与其他降水系统(即白云锋和移行外热带气旋)相关事件发生频率的相对增加。4 K 暖化实验中的异常水汽供应导致来自贝尤锋面和移栖性外热带气旋的大范围强降水增强,达到与历史气候下热带气旋相关事件相当的强度。
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.