Advances in Atmospheric Sciences最新文献_第10页

Alignment of Track Oscillations during Tropical Cyclone Rapid Intensification 热带气旋快速增强过程中的轨迹振荡排列

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-02-09 DOI: 10.1007/s00376-023-3073-y

{"title":"Alignment of Track Oscillations during Tropical Cyclone Rapid Intensification","authors":"","doi":"10.1007/s00376-023-3073-y","DOIUrl":"https://doi.org/10.1007/s00376-023-3073-y","url":null,"abstract":"<h3>Abstract</h3> Recent studies on tropical cyclone (TC) intensity change indicate that the development of a vertically aligned TC circulation is a key feature of its rapid intensification (RI), however, understanding how vortex alignment occurs remains a challenging topic in TC intensity change research. Based on the simulation outputs of North Atlantic Hurricane Wilma (2005) and western North Pacific Typhoon Rammasun (2014), vortex track oscillations at different vertical levels and their associated role in vortex alignment are examined to improve our understanding of the vortex alignment during RI of TCs with initial hurricane intensity. It is found that vortex tracks at different vertical levels oscillate consistently in speed and direction during the RI of the two simulated TCs. While the consistent track oscillation reduces the oscillation tilt during RI, the reduction of vortex tilt results mainly from the mean track before RI. It is also found that the vortex tilt is primarily due to the mean vortex track before and after RI. The track oscillations are closely associated with wavenumber-1 vortex Rossby waves that are dominant wavenumber-1 circulations in the TC inner-core region. This study suggests that the dynamics of the wavenumber-1 vortex Rossby waves play an important role in the regulation of the physical processes associated with the track oscillation and vertical alignment of TCs.","PeriodicalId":7249,"journal":{"name":"Advances in Atmospheric Sciences","volume":"93 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Unprecedented Extreme Anticyclonic Anomaly over Northeast Asia in July 2021 and Its Climatic Impacts 2021 年 7 月东北亚上空前所未有的极端反气旋异常及其气候影响

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-02-09 DOI: 10.1007/s00376-023-3026-5

Xingyan Zhou, Riyu Lu

{"title":"The Unprecedented Extreme Anticyclonic Anomaly over Northeast Asia in July 2021 and Its Climatic Impacts","authors":"Xingyan Zhou, Riyu Lu","doi":"10.1007/s00376-023-3026-5","DOIUrl":"https://doi.org/10.1007/s00376-023-3026-5","url":null,"abstract":"This study investigates the evolution of an extreme anomalous anticyclone (AA) event over Northeast Asia, which was one of the dominant circulation systems responsible for the catastrophic extreme precipitation event in July 2021 in Henan, and further explores the significant impact of this AA on surface temperatures beneath it. The results indicate that this AA event over Northeast Asia was unprecedented in terms of intensity and duration. The AA was very persistent and extremely strong for 10 consecutive days from 13 to 22 July 2021. This long-lived and unprecedented AA led to the persistence of warmer surface temperatures beyond the temporal span of the pronounced 500-hPa anticyclonic signature as the surface air temperatures over land in Northeast Asia remained extremely warm through 29 July 2021. Moreover, the sea surface temperatures in the Sea of Japan/East Sea were extremely high for 30 consecutive days from 13 July to 11 August 2021, persisting well after the weakening or departure of this AA. These results emphasize the extreme nature of this AA over Northeast Asia in July 2021 and its role in multiple extreme climate events, even over remote regions. Furthermore, possible reasons for this long-lasting AA are explored, and it is suggested to be a byproduct of a teleconnection pattern over extratropical Eurasia during the first half of its life cycle, and of the Pacific–Japan teleconnection pattern during the latter half.","PeriodicalId":7249,"journal":{"name":"Advances in Atmospheric Sciences","volume":"27 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Enhancing Deep Learning Soil Moisture Forecasting Models by Integrating Physics-based Models 通过整合物理模型加强深度学习土壤水分预报模型

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-02-07 DOI: 10.1007/s00376-023-3181-8

Lu Li, Yongjiu Dai, Zhongwang Wei, Wei Shangguan, Nan Wei, Yonggen Zhang, Qingliang Li, Xian-Xiang Li

{"title":"Enhancing Deep Learning Soil Moisture Forecasting Models by Integrating Physics-based Models","authors":"Lu Li, Yongjiu Dai, Zhongwang Wei, Wei Shangguan, Nan Wei, Yonggen Zhang, Qingliang Li, Xian-Xiang Li","doi":"10.1007/s00376-023-3181-8","DOIUrl":"https://doi.org/10.1007/s00376-023-3181-8","url":null,"abstract":"Accurate soil moisture (SM) prediction is critical for understanding hydrological processes. Physics-based (PB) models exhibit large uncertainties in SM predictions arising from uncertain parameterizations and insufficient representation of land-surface processes. In addition to PB models, deep learning (DL) models have been widely used in SM predictions recently. However, few pure DL models have notably high success rates due to lacking physical information. Thus, we developed hybrid models to effectively integrate the outputs of PB models into DL models to improve SM predictions. To this end, we first developed a hybrid model based on the attention mechanism to take advantage of PB models at each forecast time scale (attention model). We further built an ensemble model that combined the advantages of different hybrid schemes (ensemble model). We utilized SM forecasts from the Global Forecast System to enhance the convolutional long short-term memory (ConvLSTM) model for 1–16 days of SM predictions. The performances of the proposed hybrid models were investigated and compared with two existing hybrid models. The results showed that the attention model could leverage benefits of PB models and achieved the best predictability of drought events among the different hybrid models. Moreover, the ensemble model performed best among all hybrid models at all forecast time scales and different soil conditions. It is highlighted that the ensemble model outperformed the pure DL model over 79.5% of in situ stations for 16-day predictions. These findings suggest that our proposed hybrid models can adequately exploit the benefits of PB model outputs to aid DL models in making SM predictions.","PeriodicalId":7249,"journal":{"name":"Advances in Atmospheric Sciences","volume":"93 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Different El Niño Flavors and Associated Atmospheric Teleconnections as Simulated in a Hybrid Coupled Model 混合耦合模型模拟的不同厄尔尼诺现象及相关大气远缘联系

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-02-06 DOI: 10.1007/s00376-023-3082-x

Junya Hu, Hongna Wang, Chuan Gao, Rong-Hua Zhang

{"title":"Different El Niño Flavors and Associated Atmospheric Teleconnections as Simulated in a Hybrid Coupled Model","authors":"Junya Hu, Hongna Wang, Chuan Gao, Rong-Hua Zhang","doi":"10.1007/s00376-023-3082-x","DOIUrl":"https://doi.org/10.1007/s00376-023-3082-x","url":null,"abstract":"A previously developed hybrid coupled model (HCM) is composed of an intermediate tropical Pacific Ocean model and a global atmospheric general circulation model (AGCM), denoted as HCMAGCM. In this study, different El Niño flavors, namely the Eastern-Pacific (EP) and Central-Pacific (CP) types, and the associated global atmospheric teleconnections are examined in a 1000-yr control simulation of the HCMAGCM. The HCMAGCM indicates profoundly different characteristics among EP and CP El Niño events in terms of related oceanic and atmospheric variables in the tropical Pacific, including the amplitude and spatial patterns of sea surface temperature (SST), zonal wind stress, and precipitation anomalies. An SST budget analysis indicates that the thermocline feedback and zonal advective feedback dominantly contribute to the growth of EP and CP El Niño events, respectively. Corresponding to the shifts in the tropical rainfall and deep convection during EP and CP El Niño events, the model also reproduces the differences in the extratropical atmospheric responses during the boreal winter. In particular, the EP El Niño tends to be dominant in exciting a poleward wave train pattern to the Northern Hemisphere, while the CP El Niño tends to preferably produce a wave train similar to the Pacific North American (PNA) pattern. As a result, different climatic impacts exist in North American regions, with a warm-north and cold-south pattern during an EP El Niño and a warm-northeast and cold-southwest pattern during a CP El Niño, respectively. This modeling result highlights the importance of internal natural processes within the tropical Pacific as they relate to the genesis of ENSO diversity because the active ocean–atmosphere coupling is allowed only in the tropical Pacific within the framework of the HCMAGCM.","PeriodicalId":7249,"journal":{"name":"Advances in Atmospheric Sciences","volume":"27 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Assessing the Performance of a Dynamical Downscaling Simulation Driven by a Bias-Corrected CMIP6 Dataset for Asian Climate 评估由偏差校正 CMIP6 数据集驱动的亚洲气候动态降尺度模拟的性能

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-02-06 DOI: 10.1007/s00376-023-3101-y

{"title":"Assessing the Performance of a Dynamical Downscaling Simulation Driven by a Bias-Corrected CMIP6 Dataset for Asian Climate","authors":"","doi":"10.1007/s00376-023-3101-y","DOIUrl":"https://doi.org/10.1007/s00376-023-3101-y","url":null,"abstract":"<h3>Abstract</h3> In this study, we aim to assess dynamical downscaling simulations by utilizing a novel bias-corrected global climate model (GCM) data to drive a regional climate model (RCM) over the Asia-western North Pacific region. Three simulations were conducted with a 25-km grid spacing for the period 1980–2014. The first simulation (WRF_ERA5) was driven by the European Centre for Medium-Range Weather Forecasts Reanalysis 5 (ERA5) dataset and served as the validation dataset. The original GCM dataset (MPI-ESM1-2-HR model) was used to drive the second simulation (WRF_GCM), while the third simulation (WRF_GCMbc) was driven by the bias-corrected GCM dataset. The bias-corrected GCM data has an ERA5-based mean and interannual variance and long-term trends derived from the ensemble mean of 18 CMIP6 models. Results demonstrate that the WRFGCMbc significantly reduced the root-mean-square errors (RMSEs) of the climatological mean of downscaled variables, including temperature, precipitation, snow, wind, relative humidity, and planetary boundary layer height by 50%–90% compared to the WRF_GCM. Similarly, the RMSEs of interannual-to-interdecadal variances of downscaled variables were reduced by 30%–60%. Furthermore, the WRFGCMbc better captured the annual cycle of the monsoon circulation and intraseasonal and day-to-day variabilities. The leading empirical orthogonal function (EOF) shows a monopole precipitation mode in the WRFGCM. In contrast, the WRF_GCMbc successfully reproduced the observed tri-pole mode of summer precipitation over eastern China. This improvement could be attributed to a better-simulated location of the western North Pacific subtropical high in the WRF_GCMbc after GCM bias correction.","PeriodicalId":7249,"journal":{"name":"Advances in Atmospheric Sciences","volume":"4 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Deep Learning Shows Promise for Seasonal Prediction of Antarctic Sea Ice in a Rapid Decline Scenario 深度学习显示出在南极海冰迅速减少情况下进行季节性预测的前景

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-02-06 DOI: 10.1007/s00376-024-3380-y

引用次数: 0

The Persistence and Zonal Scale of Atmospheric Dipolar Modes 大气双极模式的持久性和地带尺度

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-01-05 DOI: 10.1007/s00376-023-3023-8

Jie Song

{"title":"The Persistence and Zonal Scale of Atmospheric Dipolar Modes","authors":"Jie Song","doi":"10.1007/s00376-023-3023-8","DOIUrl":"https://doi.org/10.1007/s00376-023-3023-8","url":null,"abstract":"This study investigates the relationship between the persistence and the zonal scale of atmospheric dipolar modes (DMs). Results from the daily data of ERA5 and the long-term output of an idealized atmospheric model show that the atmospheric DMs with a broader (narrower) zonal scale dipolar structure possess a longer (shorter) persistence. A detailed vorticity budget analysis indicates that the persistence of a hemispheric-scale DM (1/1 DM) and a regional or sectoral DM (1/8 DM) in the model both largely rely on the persistence of the nonlinear eddy forcing. Linear terms can indirectly reduce the persistence of the anomalous nonlinear eddy forcing in a 1/8 DM by modifying the baroclinicity via the arousal of anomalous vertical motions. Therefore, the atmospheric DMs with a broader (narrower) zonal scale possess a longer (shorter) persistence because the effects of the linear terms are less (more) pronounced when the atmospheric DMs have better (worse) zonal symmetry. Further analyses show that the positive eddy feedback effect is weak or even absent in a 1/8 DM and the high-frequency eddy forcing acts more like a concomitant phenomenon rather than a leading driving factor for a 1/8 DM. Thus, the hemispheric-scale DM and the regional or sectoral DMs are different, not only in their persistence but also in their dynamics.","PeriodicalId":7249,"journal":{"name":"Advances in Atmospheric Sciences","volume":"27 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139101832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Frontogenesis and Frontolysis of a Cold Filament Driven by the Cross-Filament Wind and Wave Fields Simulated by a Large Eddy Simulation 大涡模拟法模拟的冷丝交叉风场和波场驱动的锋面生成和锋面溶解过程

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-01-05 DOI: 10.1007/s00376-023-3037-2

Guojing Li, Dongxiao Wang, Changming Dong, Jiayi Pan, Yeqiang Shu, Zhenqiu Zhang

引用次数: 0

Comparison of the Minimum Bounding Rectangle and Minimum Circumscribed Ellipse of Rain Cells from TRMM TRMM 雨区最小边界矩形与最小圆刻椭圆的比较

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-01-05 DOI: 10.1007/s00376-023-2281-9

Hongke Cai, Yaqin Mao, Xuanhao Zhu, Yunfei Fu, Renjun Zhou

{"title":"Comparison of the Minimum Bounding Rectangle and Minimum Circumscribed Ellipse of Rain Cells from TRMM","authors":"Hongke Cai, Yaqin Mao, Xuanhao Zhu, Yunfei Fu, Renjun Zhou","doi":"10.1007/s00376-023-2281-9","DOIUrl":"https://doi.org/10.1007/s00376-023-2281-9","url":null,"abstract":"Based on the TRMM dataset, this paper compares the applicability of the improved MCE (minimum circumscribed ellipse), MBR (minimum bounding rectangle), and DIA (direct indexing area) methods for rain cell fitting. These three methods can reflect the geometric characteristics of clouds and apply geometric parameters to estimate the real dimensions of rain cells. The MCE method shows a major advantage in identifying the circumference of rain cells. The circumference of rain cells identified by MCE in most samples is smaller than that identified by DIA and MBR, and more similar to the observed rain cells. The area of rain cells identified by MBR is relatively robust. For rain cells composed of many pixels (N > 20), the overall performance is better than that of MCE, but the contribution of MBR to the best identification results, which have the shortest circumference and the smallest area, is less than that of MCE. The DIA method is best suited to small rain cells with a circumference of less than 100 km and an area of less than 120 km2, but the overall performance is mediocre. The MCE method tends to achieve the highest success at any angle, whereas there are fewer “best identification” results from DIA or MBR and more of the worst ones in the along-track direction and cross-track direction. Through this comprehensive comparison, we conclude that MCE can obtain the best fitting results with the shortest circumference and the smallest area on behalf of the high filling effect for all sizes of rain cells.","PeriodicalId":7249,"journal":{"name":"Advances in Atmospheric Sciences","volume":"208 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139101835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A Long-Time-Step-Permitting Tracer Transport Model on the Regular Latitude–Longitude Grid 常规纬度-经度网格上的长时步长允许示踪剂迁移模型

IF 5.8 2区地球科学

Advances in Atmospheric Sciences Pub Date : 2024-01-05 DOI: 10.1007/s00376-023-2270-z

Jianghao Li, Li Dong

引用次数: 0