IF 1.2 4区地球科学

热带气象学报 Pub Date : 2023-12-01 DOI: 10.3724/j.1006-8775.2023.036

Huan-tong Geng, Bo-yang Xie, Xiao-yan Ge, Jin-zhong Min, Xiao-ran Zhuang

{"title":"Improved Weather Radar Echo Extrapolation Through Wind Speed Data Fusion Using a New Spatiotemporal Neural Network Model","authors":"Huan-tong Geng, Bo-yang Xie, Xiao-yan Ge, Jin-zhong Min, Xiao-ran Zhuang","doi":"10.3724/j.1006-8775.2023.036","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.036","url":null,"abstract":": Weather radar echo extrapolation plays a crucial role in weather forecasting. However, traditional weather radar echo extrapolation methods are not very accurate and do not make full use of historical data. Deep learning algorithms based on Recurrent Neural Networks also have the problem of accumulating errors. Moreover, it is difficult to obtain higher accuracy by relying on a single historical radar echo observation. Therefore, in this study, we constructed the Fusion GRU module, which leverages a cascade structure to effectively combine radar echo data and mean wind data. We also designed the Top Connection so that the model can capture the global spatial relationship to construct constraints on the predictions. Based on the Jiangsu Province dataset, we compared some models. The results show that our proposed model, Cascade Fusion Spatiotemporal Network (CFSN), improved the critical success index (CSI) by 10.7% over the baseline at the threshold of 30 dBZ. Ablation experiments further validated the effectiveness of our model. Similarly, the CSI of the complete CFSN was 0.004 higher than the suboptimal solution without the cross-attention module at the threshold of 30 dBZ.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"55 ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138988791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of the CMA-GD Model in Predicting Wind Speed at Wind Farms in Hubei, China CMA-GD 模型在预测中国湖北风电场风速方面的性能

IF 1.2 4区地球科学

热带气象学报 Pub Date : 2023-12-01 DOI: 10.3724/j.1006-8775.2023.035

Pei-hua Xu, Chi Cheng, Wen Wang, Zheng-hong Chen, Shui-xin Zhong, Yan-xia Zhang

{"title":"Performance of the CMA-GD Model in Predicting Wind Speed at Wind Farms in Hubei, China","authors":"Pei-hua Xu, Chi Cheng, Wen Wang, Zheng-hong Chen, Shui-xin Zhong, Yan-xia Zhang","doi":"10.3724/j.1006-8775.2023.035","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.035","url":null,"abstract":": This study assesses the predictive capabilities of the CMA-GD model for wind speed prediction in two wind farms located in Hubei Province, China. The observed wind speeds at the height of 70m in wind turbines of two wind farms in Suizhou serve as the actual observation data for comparison and testing. At the same time, the wind speed predicted by the EC model is also included for comparative analysis. The results indicate that the CMA-GD model performs better than the EC model in Wind Farm A. The CMA-GD model exhibits a monthly average correlation coefficient of 0.56, root mean square error of 2.72 m s –1 , and average absolute error of 2.11 m s –1 . In contrast, the EC model shows a monthly average correlation coefficient of 0.51, root mean square error of 2.83 m s –1 , and average absolute error of 2.21 m s –1 . Conversely, in Wind Farm B, the EC model outperforms the CMA-GD model. The CMA-GD model achieves a monthly average correlation coefficient of 0.55, root mean square error of 2.61 m s –1 , and average absolute error of 2.13 m s –1 . By contrast, the EC model displays a monthly average correlation coefficient of 0.63, root mean square error of 2.04 m s –1 , and average absolute error of 1.67 m s –1 .","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"567 2","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139020851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correcting Black Carbon Absorption Measurements with Micro-aethalometer Model 200: Insights from Comparative Analysis 用 200 型微测速仪校正黑碳吸收测量结果：对比分析的启示

IF 1.2 4区地球科学

热带气象学报 Pub Date : 2023-12-01 DOI: 10.3724/j.1006-8775.2023.030

Wei-lun Zhao, Chun-sheng Zhao

{"title":"Correcting Black Carbon Absorption Measurements with Micro-aethalometer Model 200: Insights from Comparative Analysis","authors":"Wei-lun Zhao, Chun-sheng Zhao","doi":"10.3724/j.1006-8775.2023.030","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.030","url":null,"abstract":": Black carbon (BC) is the strongest visible-light-absorbing aerosol component in the atmosphere, with a significant impact on Earth’s radiative budget. Accurate measurement of BC light absorption is crucial for estimating its radiative effect. The micro-aethalometer model 200 (MA200) by AethLabs, USA, offers high-time-resolution measurement of the multi-wavelength absorption coefficient ( σ ab ) within 1 s, making it widely used in aerial measurement due to its compact size and light weight. However, the reliability of the measured σ ab has not been extensively studied in previous research. In this study, we evaluate the performance of MA200 by comparing σ ab measurements obtained from MA200 with those from the aethalometer model 33 (AE33) by Magee, USA. Our results revealed a significant variation in the determinant coefficient ( R 2 ) between σ ab measurements from MA200 and AE33, depending on the time resolution. The R 2 increases from 0.1 to 0.5 and further to 0.97 as the time resolution of σ ab increases from 1 s to 30 s and 60 s, respectively. We recommend a minimum time resolution of 30 s for stable σ ab measurements using MA200. Moreover, we determine σ ab from attenuation coefficient ( σ ATN ) measured by MA200 as σ ab = ( σ ATN – σ 0 )/ C MA , where σ 0 ranges from – 15.3 Mm –1 to – 6.4 Mm –1 and C MA ranges from 2.65 to 3.21. Correcting the measured σ ab based on the findings of this study can provide reliable results for estimating the radiative effects of BC.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"252 ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138985618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interannual Variation and Statistical Prediction of Summer Dry and Hot Days in South China from 1970 to 2018 1970-2018年中国南方夏季干热日的年际变化与统计预测

IF 1.2 4区地球科学

热带气象学报 Pub Date : 2023-12-01 DOI: 10.3724/j.1006-8775.2023.032

Xin Xue, Yan-xing Wu, Zhen Chen, Run Liu, Zhi-jun Zhao

{"title":"Interannual Variation and Statistical Prediction of Summer Dry and Hot Days in South China from 1970 to 2018","authors":"Xin Xue, Yan-xing Wu, Zhen Chen, Run Liu, Zhi-jun Zhao","doi":"10.3724/j.1006-8775.2023.032","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.032","url":null,"abstract":": The frequent occurrence of dry and hot (DH) days in South China in summer has a negative impact on social development and human health. This study explored the variation characteristics of DH days and the possible reasons for this knotty problem. The findings revealed a notable increase in the number of DH days across most stations, indicating a significant upward trend. Additionally, DH events were observed to occur frequently. The number of DH days increased during 1970–1990, decreased from 1991 to 1997, and stayed stable after 1997. The key climate factors affecting the interannual variability of the number of DH days were the Indian Ocean Basin warming (IOBW) in spring and the East Asian Summer Monsoon (EASM). Compared with the negative phase of IOBW, in the positive phase of IOBW, 500 hPa and 850 hPa geopotential height enhanced, the West Pacific subtropical high strengthened and extended abnormally to the west, more solar radiation reached the surface, surface outgoing longwave radiation increased, and there was an anomalous anticyclone in eastern South China. The atmospheric circulation characteristics of the positive and negative phases of ESAM were opposite to those of IOBW, and the abnormal circulation of the positive (negative) phases of ESAM was unfavorable (favorable) for the increase in the number of DH days. A long-term prediction model for the number of summer DH days was established using multiple linear regression, incorporating the key climate factors. The correlation coefficient between the observed and predicted number of DH days was 0.65, and the root-mean-square error was 2.8. In addition, independent forecasts for 2019 showed a deviation of just 1 day. The results of the independent recovery test confirmed the stability of the model, providing evidence that climatic factors did have an impact on DH days in South China.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"132 ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138989807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of Performance of Polar WRF Model in Simulating Precipitation over Qinghai-Tibet Plateau 极地 WRF 模型模拟青藏高原降水的性能评估

IF 1.2 4区地球科学

热带气象学报 Pub Date : 2023-12-01 DOI: 10.3724/j.1006-8775.2023.031

Jian-jun Xue, Zi-niu Xiao

{"title":"Evaluation of Performance of Polar WRF Model in Simulating Precipitation over Qinghai-Tibet Plateau","authors":"Jian-jun Xue, Zi-niu Xiao","doi":"10.3724/j.1006-8775.2023.031","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.031","url":null,"abstract":": Considering the complex topographic forcing and large cryosphere concentration, the present study utilized the polar-optimized WRF model (Polar WRF) to conduct downscaling simulations over the Qinghai-Tibet Plateau (TP) and its surrounding regions. Multi-group experiments with the 10 km horizontal resolution are used to evaluate the modeling of precipitation. Firstly, on the basis of the model ground surface properties upgrade and the optimized Noah-MP, the “better-performing” configuration suite for modeling precipitation is comprehensively examined. Various model parameters such as nudging options, five cumulus parameterization schemes, two planetary boundary layer schemes, and six microphysics schemes are investigated to further refine the Polar WRF configuration. Moreover, the precipitation simulation for a full calendar year is compared with multiple reanalyses and observations. The simulations demonstrate that the Polar WRF model successfully captures the general features of precipitation over this region and is sensitive to model parameters. Based on the results, it is recommended to use grid nudging with q intensity coefficient of 0.0002, the multi-scale kain-fritsch cumulus parameterization, the Yonsei University boundary layer scheme, and the Morrison 2-mom microphysics with reduced default droplet concentration value of 100 cm –3 . Overall, the model performance is better than the ERA-interim and TRMM 3b42. It is comparable to, and in some cases slightly better than, the CRA-Land, especially in the prediction for the western part of the plateau where in situ observations are limited, and the cryosphere-atmosphere interaction is more pronounced.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"48 18","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139016060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Zoning Evaluation of Hourly Precipitation in High-resolution Regional Numerical Models over Hainan Island 海南岛上空高分辨率区域数值模式逐时降水分区评价

IF 1.2 4区地球科学

热带气象学报 Pub Date : 2023-12-01 DOI: 10.3724/j.1006-8775.2023.034

Xiao Feng, Yu Wu, Wei Yang, Xun Li

{"title":"Zoning Evaluation of Hourly Precipitation in High-resolution Regional Numerical Models over Hainan Island","authors":"Xiao Feng, Yu Wu, Wei Yang, Xun Li","doi":"10.3724/j.1006-8775.2023.034","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.034","url":null,"abstract":": This study assesses the performance of three high-resolution regional numerical models in predicting hourly rainfall over Hainan Island from April to October for the years from 2020 to 2022. The rainfall amount, frequency, intensity, duration, and diurnal cycle are examined through zoning evaluation. The results show that the China Meteorological Administration Guangdong Rapid Update Assimilation Numerical Forecast System (CMA-GD) tends to forecast a higher occurrence of light precipitation. It underestimates the late afternoon precipitation and the occurrence of short-duration events. The China Meteorological Administration Shanghai Numerical Forecast Model System (CMA-SH9) reproduces excessive precipitation at a higher frequency and intensity throughout the island. It overestimates rainfall during the late afternoon and midnight periods. The simulated most frequent peak times of rainfall in CMA-SH9 are 0–1 hour deviations from the observed data. The China Meteorological Administration Mesoscale Weather Numerical Forecasting System (CMA-MESO) displays a similar pattern to rainfall observations but fails to replicate reasonable structure and diurnal variation of frequency-intensity. It underestimates the occurrence of long-duration events and overestimates related rainfall amounts from midnight to early morning. Notably, significant discrepancies are observed in the predictions of the three models for areas with complex terrain, such as the central, southeastern, and southwestern regions of Hainan Island.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"132 2","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139025299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Adaptive Wind Gust and Associated Gust-factor Model for the Gust-producing Weather over the Northern South China Sea 南海北部阵风天气的自适应阵风及相关阵风因子模型

IF 1.2 4区地球科学

热带气象学报 Pub Date : 2023-12-01 DOI: 10.3724/j.1006-8775.2023.029

Ling Huang, Chun-xia Liu, Qian Liu

{"title":"Adaptive Wind Gust and Associated Gust-factor Model for the Gust-producing Weather over the Northern South China Sea","authors":"Ling Huang, Chun-xia Liu, Qian Liu","doi":"10.3724/j.1006-8775.2023.029","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.029","url":null,"abstract":": Wind gusts are common environmental hazards that can damage buildings, bridges, aircraft, and cruise ships and interrupt electric power distribution, air traffic, waterway transport and port operations. Accurately predicting peak wind gusts in numerical models is essential for saving lives and preventing economic losses. This study investigates the climatology of peak wind gusts and their associated gust factors (GFs) using observations in the coastal and open ocean of the northern South China Sea (NSCS), where severe gust-producing weather occurs throughout the year. The stratified climatology demonstrates that the peak wind gust and GF vary with seasons and particularly with weather types. Based on the inversely proportional relationship between the GF and mean wind speed (MWS), a variety of GF models are constructed through least squares regression analysis. Peak gust speed (PGS) forecasts are obtained through the GF models by multiplying the GFs by observed wind speeds rather than forecasted wind speeds. The errors are thus entirely due to the representation of the GF models. The GF models are improved with weather-adaptive GFs, as evaluated by the stratified MWS. Nevertheless, these weather-adaptive GF models show negative bias for predicting stronger PGSs due to insufficient data representation of the extreme wind gusts. The evaluation of the above models provides insight into maximizing the performance of GF models. This study further proposes a stratified process for forecasting peak wind gusts for routine operations.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"65 13","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139014294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observational and Mechanistic Analysis of a Nighttime Warm-Sector Heavy Rainfall Event Within the Subtropical High over the Southeastern Coast of China 中国东南沿海副热带高压区夜间暖扇区强降雨事件的观测与机理分析

IF 1.2 4区地球科学

热带气象学报 Pub Date : 2023-12-01 DOI: 10.3724/j.1006-8775.2023.033

Long-bin Ye, Jing Zhu, Yun Chen, Fei Li, Lin-ye Zheng

{"title":"Observational and Mechanistic Analysis of a Nighttime Warm-Sector Heavy Rainfall Event Within the Subtropical High over the Southeastern Coast of China","authors":"Long-bin Ye, Jing Zhu, Yun Chen, Fei Li, Lin-ye Zheng","doi":"10.3724/j.1006-8775.2023.033","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.033","url":null,"abstract":": In August 2021, a warm-sector heavy rainfall event under the control of the western Pacific subtropical high occurred over the southeastern coast of China. Induced by a linearly shaped mesoscale convective system (MCS), this heavy rainfall event was characterized by localized heavy rainfall, high cumulative rainfall, and extreme rainfall intensity. Using various observational data, this study first analyzed the precipitation features and radar reflectivity evolution. It then examined the role of environmental conditions and the relationship between the ambient wind field and convective initiation (CI). Furthermore, the dynamic lifting mechanism within the organization of the MCS was revealed by employing multi-Doppler radar retrieval methods. Results demonstrated that the linearly shaped MCS, developed under the influence of the subtropical high, was the primary cause of the extreme rainfall event. High temperatures and humidity, coupled with the convergence of low-level southerly winds, established the environmental conditions for MCS development. The superposition of the convergence zone generated by the southerly winds in the boundary layer (925–1000 hPa) and the divergence zone in the lower layer (700–925 hPa) supplied dynamic lifting conditions for CI. Additionally, a long-term shear line (southerly southwesterly) offered favorable conditions for the organization of the linearly shaped MCS. The combined effects of strengthening low-level southerly winds and secondary circulation in mid-upper levels were influential factors in the development and maintenance of the linearly shaped MCS.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"590 ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139012866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Relationship Between Indian Ocean SST and Tropical Cyclone Genesis Frequency over North Indian Ocean in May 印度洋海温与5月北印度洋热带气旋发生频率的关系

4区地球科学

热带气象学报 Pub Date : 2023-09-01 DOI: 10.3724/j.1006-8775.2023.027

Yan CHEN, Hong-ming YAN, Yun TAO, Kun-lin YANG, Meng-qiu WANG

{"title":"The Relationship Between Indian Ocean SST and Tropical Cyclone Genesis Frequency over North Indian Ocean in May","authors":"Yan CHEN, Hong-ming YAN, Yun TAO, Kun-lin YANG, Meng-qiu WANG","doi":"10.3724/j.1006-8775.2023.027","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.027","url":null,"abstract":": Tropical cyclone (TC) activities in the North Indian Ocean (NIO) peak in May during the pre-monsoon period, but the TC frequency shows obvious inter-annual variations. By conducting statistical analysis and dynamic diagnosis of long-term data from 1948 to 2016, the relationship between the inter-annual variations of Indian Ocean SST and NIO TC genesis frequency in May is analyzed in this paper. Furthermore, the potential mechanism concerning the effect of SST anomaly on TC frequency is also investigated. The findings are as follows: 1) there is a broadly consistent negative correlation between NIO TC frequency in May and SST in the Indian Ocean from March to May, with the key influencing area located in the southwestern Indian Ocean (SWIO); 2) the anomalies of SST in SWIO (SWIO-SST) are closely related to a teleconnection pattern surrounding the Indian Ocean, which can significantly modulate the high-level divergence, mid-level vertical motion and other related environmental factors and ultimately influence the formation of TCs over the NIO; 3) the increasing trend of SWIO-SST may play an essential role in the downward trend of NIO TC frequency over the past 69 years.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135735435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diversity on the Interannual Variations of Spring Monthly Precipitation in Southern China and the Associated Tropical Sea Surface Temperature Anomalies 华南春季月降水年际变化多样性及其相关的热带海温异常

4区地球科学

热带气象学报 Pub Date : 2023-09-01 DOI: 10.3724/j.1006-8775.2023.025

Ru-yue GUO, Wei-juan PAN, Min-ling KE, Wei WEI, Zi-qian WANG

{"title":"Diversity on the Interannual Variations of Spring Monthly Precipitation in Southern China and the Associated Tropical Sea Surface Temperature Anomalies","authors":"Ru-yue GUO, Wei-juan PAN, Min-ling KE, Wei WEI, Zi-qian WANG","doi":"10.3724/j.1006-8775.2023.025","DOIUrl":"https://doi.org/10.3724/j.1006-8775.2023.025","url":null,"abstract":": There is a continuous and relatively stable rainy period every spring in southern China (SC). This spring precipitation process is a unique weather and climate phenomenon in East Asia. Previously, the variation characteristics and associated mechanisms of this precipitation process have been mostly discussed from the perspective of seasonal mean. Based on the observed and reanalysis datasets from 1982 to 2021, this study investigates the diversity of the interannual variations of monthly precipitation in spring in SC, and focuses on the potential influence of the tropical sea surface temperature (SST) anomalies. The results show that the interannual variations of monthly precipitation in spring in SC have significant differences, and the correlations between each two months are very weak. All the interannual variations of precipitation in three months are related to a similar western North Pacific anomalous anticyclone (WNPAC), and the southwesterlies at the western flank of WNPAC bring abundant water vapor for the precipitation in SC. However, the WNPAC is influenced by tropical SST anomalies in different regions each month. The interannual variation of precipitation in March in SC is mainly influenced by the signal of El Niño-Southern Oscillation, and the associated SST anomalies in the equatorial central-eastern Pacific regulate the WNPAC through the Pacific-East Asia (PEA) tele-connection. In contrast, the WNPAC associated with the interannual variation of precipitation in April can be affected by the SST anomalies in the northwestern equatorial Pacific through a thermally induced Rossby wave response. The interannual variation of precipitation in May is regulated by the SST anomalies around the western Maritime Continent, which stimulates the development of low-level anomalous anticyclones over the South China Sea and east of the Philippine Sea by driving anomalous meridional vertical circulation.","PeriodicalId":17432,"journal":{"name":"热带气象学报","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135735420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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