Characteristics of Meiyu Seen From Multiple Observational Analyses and Reanalyses

Tong, Mingjun; Zheng, Zhihai; Fu, Qiang

doi:10.1029/2021ea001647

Cited by 7 publications

(8 citation statements)

References 42 publications

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“…The main data in this study is the latest meteorological reanalysis data ERA5 of European Center for Medium-Range Weather Forecasts, including precipitation data, wind and geopotential data of multiple barometric layers, etc. The study of Tong [3] showed that ERA5 had similar climate mean, annual variance, and consistent interannual variation of precipitation to satellite data of the Tropical Rainfall Measuring Mission (TRMM) in Meiyu. It also solved the problem of lack of observation data at sea in MYA.…”

Section: Datamentioning

confidence: 91%

“…In this study, we define the MYA as the region between 28 • N-36 • N and 110 • E-140 • E with heavy rainfall [3]. The monthly data of June, July, and August from 1991 to 2020 were used to analyze the intraseasonal variations of precipitation and circulation anomalies so that high-frequency oscillations could be removed as much as possible without losing the major characteristics of intraseasonal variations.…”

Section: Datamentioning

confidence: 99%

“…The Meiyu area (MYA) is a concentrated area of East Asian subtropical summer rainfall, reflecting the characteristics of the East Asian summer monsoon (EASM) [1]. The most prominent feature of local precipitation is the Meiyu [2,3], which is also called Changma in Korea [4] and Baiu in Japan [5], a quasi-stationary rain belt from the lower reaches of the Yangtze River (LRYR) to southern Japan. It usually starts in mid-June and ends in mid-July, marking the beginning of the summer monsoon in the northern hemisphere subtropical regions and the beginning of the rainy season in East Asian temperate regions, respectively, showing its importance as a member of the EASM system [6].…”

Section: Introductionmentioning

confidence: 99%

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The Intraseasonal Variations of the Leading Mode of Summer Precipitation Anomalies in Meiyu Area of East Asia

et al. 2022

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The intraseasonal variations of summer precipitation anomalies in the Meiyu area of East Asia are analyzed by applying a combined empirical orthogonal function (CEOF) of the latest meteorological reanalysis data ERA5 of European Center for Medium-Range Weather Forecasts for the period from 1991 to 2020, and the circulation structures and sources of variability of CEOF are also investigated. The first mode of the intraseasonal variations shows an in-phase pattern over the Meiyu area in June, July, and August, accounting for 22.2% of the total variance in the intraseasonal variations of summer precipitation anomalies. The positive (negative) CEOF1 is accompanied by the negative (positive) East Asia/Pacific pattern, including strong westerly wind anomalies in the upper troposphere and southwest monsoon in the lower troposphere, and the Western Pacific Subtropical High extending westward and its ridge line slightly south. The positive CEOF1 is preceded by decay of El Niño episodes, including the abnormal warm sea surface temperature anomalies (SSTAs) in the equatorial Central-Eastern Pacific in spring and warm SSTAs in the equatorial Indian Ocean in summer. The second mode shows an opposite precipitation anomaly in June and July, and the distribution in August is not significant. The corresponding geopotential height circulation of positive CEOF2 shows the large negative anomaly in the region north of 40° N and a positive anomaly over Japan in June, whereas the pattern reverses in July. At the same time, there is a radical reversion from abnormal eastly to westly wind in the upper troposphere. The structure of CEOF2 is somewhat induced by local SSTAs over the Northern Indian Ocean and South China Sea.

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Section: Datamentioning

confidence: 91%

Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Intraseasonal Variations of the Leading Mode of Summer Precipitation Anomalies in Meiyu Area of East Asia

et al. 2022

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“…There are two prerequisites to forming condensate: one is high humidity, which provides a source of water, and the other is a large temperature difference. Both conditions can be met during the rainy season in southeastern China, since in the subtropical monsoon climate zone, the humid air will stop along the Yangtze River when warm air blowing from the south meets cold air from the north pole, resulting in high temperatures and humidity in the region [33,34]. During this period, condensate was easily formed in caves, tombs, and indoor spaces with rapid temperature changes.…”

Section: Introductionmentioning

confidence: 99%

Environmental Factor Accelerate the Deterioration of Tuff Stone Heritage: A Case Study of a Stone House in Southeast China

Yang

Shen²,

Zhang

et al. 2022

Buildings

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Water plays an important role in the deterioration of rocks. Often, the condensation cannot be ignored in addition to the rain and seepage, especially for stone relics built with tuff in humid areas. As part of this study, a century-old stone house in southeastern China was investigated alongside the microclimate, including temperature, humidity, and rainfall in the study area. Results showed that the main types of deterioration in this house were detachment, with some areas exhibiting surface hardness decreased by more than 50%. This decay was caused in part by condensation on the inner walls of the stone house during the rainy season. According to statistics, more than two-thirds of the time the rainy season produces condensate on the inner wall, which is primarily found on the north side of the house because there is less solar radiation. Conversely, the stress caused by severe temperature differences on the south side contributes more to the deterioration of rock. Environmental conditions with high humidity and strong temperature differences will accelerate the deterioration process of tuff stone with high porosity. Consequently, it is recommended that stones built by tuff in such a humid environment take rainproof measures and maintain good air circulation to reduce the adverse effects of condensation.

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“…Meiyu is the outcome of seasonal adjustment of atmospheric circulation in the East Asian monsoon region (Liang et al 2007;Zhou et al 2020;Tong et al 2021). With the onset of the South China Sea summer monsoon, and following the northward advance of the East Asian monsoon, the northwest Pacific subtropical high (hereinafter, SH) has three northward jumps (Su & Xue 2011;Ye et al 2014).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Identification and characteristics analysis of Meiyu in Anhui Province based on the National Standard of Meiyu monitoring indices

et al. 2021

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Meiyu is the term used to depict the consecutive rainy weather advancing in the months before the flooding season in East Asia. However, the temporal-spatial climatic characteristics of Meiyu can be differently specified by different evaluation criteria. In this study, we employ both the atmospheric circulation conditions and meteorological factors to identify the spatial characteristics of precipitation of Meiyu in Anhui Province using the collected data of 1957–2020. We further conduct a comparison analysis of the precipitation characteristics in the northern Huaihe River of Aihui province (NHA) with Meiyu rainfall features in two other regions: south of the Yangtze River in Anhui Province (SYA) and the region between the Yangtze River and Huaihe River in Anhui Province (YHA). Finally, the relation between the intensity index between Meiyu and flood or drought is investigated. The results showed that the climatic feature in NHA is a transitional region between Meiyu and non-Meiyu. Also, we proposed a Meiyu intensity index determined by the precipitation amount, intensity, and days of heavy rain. This index performs better than the Meiyu intensity index of National Standard in terms of flood and drought identification.

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Characteristics of Meiyu Seen From Multiple Observational Analyses and Reanalyses

Cited by 7 publications

References 42 publications

The Intraseasonal Variations of the Leading Mode of Summer Precipitation Anomalies in Meiyu Area of East Asia

The Intraseasonal Variations of the Leading Mode of Summer Precipitation Anomalies in Meiyu Area of East Asia

Environmental Factor Accelerate the Deterioration of Tuff Stone Heritage: A Case Study of a Stone House in Southeast China

Identification and characteristics analysis of Meiyu in Anhui Province based on the National Standard of Meiyu monitoring indices

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