International Journal of Climatology最新文献

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Variations and comparisons in hourly and daily precipitation extremes over eastern China in recent warming periods 最近变暖时期中国东部地区小时和日极端降水量的变化与比较
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-20 DOI: 10.1002/joc.8632
Yimeng Qi, Danqing Huang, Jiao Chen, Jinwen Zeng, Anqi Liu
{"title":"Variations and comparisons in hourly and daily precipitation extremes over eastern China in recent warming periods","authors":"Yimeng Qi,&nbsp;Danqing Huang,&nbsp;Jiao Chen,&nbsp;Jinwen Zeng,&nbsp;Anqi Liu","doi":"10.1002/joc.8632","DOIUrl":"https://doi.org/10.1002/joc.8632","url":null,"abstract":"<p>Under global warming, a notable intensification of precipitation extremes has posed significant threats to both natural ecosystems and human societies. However, there is still a lack of systematic studies on the variability of hourly precipitation extremes and a comparison with daily precipitation extremes. This study introduces a set of indices for hourly and daily precipitation extremes to systematically examine the changes across eastern China during the summers from 1980 to 2020. The results show that southern China is the sensitive regions with a notable large value of climatology in frequency and intensity for both of hourly and daily precipitation extremes. For the trends, the frequency of hourly precipitation extremes shows a rising trend in southern China, and intensity increased in northern China. Conversely, for daily precipitation extremes, the enhanced intensity and frequency are observed only in southeastern China. Additionally, the eastern coastal area experiences prolonged hourly rainfall with increasing persistence, while the region with an increased duration of daily precipitation is situated further south. Comparing the periods 1980–1999 and 2000–2020, precipitation extremes shift toward more intense and more frequent, with more pronounced variations at the hourly scale. Notably, northeastern China tend to be more intense and shorter-lived hourly precipitation extremes after 1999, while south China experiences more frequent and longer-lasting extremes. These changes are partly attributed to the increased unstable conditions, enhanced convective available potential energy and weakened convective inhibition.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 14","pages":"5192-5206"},"PeriodicalIF":3.5,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Ensemble forecasting of Indian Ocean Dipole events generated by conditional nonlinear optimal perturbation method 条件非线性最优扰动法产生的印度洋偶极子事件的集合预报
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-20 DOI: 10.1002/joc.8627
Rong Feng, Wansuo Duan, Lei Hu, Ting Liu
{"title":"Ensemble forecasting of Indian Ocean Dipole events generated by conditional nonlinear optimal perturbation method","authors":"Rong Feng,&nbsp;Wansuo Duan,&nbsp;Lei Hu,&nbsp;Ting Liu","doi":"10.1002/joc.8627","DOIUrl":"https://doi.org/10.1002/joc.8627","url":null,"abstract":"<p>In this study, we applied the conditional nonlinear optimal perturbation (CNOP) method to generate nonlinear fast-growing initial perturbations for ensemble forecasting, aiming to assess the effectiveness of the CNOP method in improving the forecast skill of climate events. Our findings reveal a significant improvement in the forecast skill of the Indian Ocean Dipole (IOD) within the CNOP ensemble forecast, particularly at long lead times, thereby extending the skilful forecast lead times. Notably, this improvement is more prominent for strong IOD events, with skilful forecast lead times exceeding 12 months, outperforming many current state-of-the-art coupled models. The high forecast skill of the CNOP method is primarily attributed to its ability to capture the uncertainties in the wind anomaly field in the eastern Indian Ocean (EIO) closely associated with IOD evolution. Consequently, CNOP ensemble members exhibit significant deviations from the control forecast, resulting in a large ensemble spread encompassing IOD evolution. Furthermore, a comparison with the climate-relevant singular vectors (CSV) method in terms of IOD and El Niño–Southern Oscillation (ENSO) predictions reveals the superior performance of the CNOP ensemble forecast. Despite the initial perturbations for ensemble forecasting being generated aimed at improving IOD forecast skill, the CNOP method significantly improves the forecast skill of both IOD and ENSO events, with a greater improvement for ENSO. Additionally, the CNOP ensemble forecast system provides more reliable estimates of forecast uncertainties and exhibits higher reliability with increasing lead times. In conclusion, the CNOP method effectively captures the nonlinear physical processes of climate events and improve the forecast skill.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 14","pages":"5119-5135"},"PeriodicalIF":3.5,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Three-dimensional evaluation framework of hazard–exposure–vulnerability for mapping heatwave risk and associated dominant dimensions in China 绘制中国热浪风险及相关主导维度的 "危害-暴露-脆弱性 "三维评估框架
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-20 DOI: 10.1002/joc.8628
Jinping Liu, Tongchang Zhang, Yanqun Ren, Patrick Willems, Ali Mirchi, Arfan Arshad, Tie Liu, Quoc Bao Pham
{"title":"Three-dimensional evaluation framework of hazard–exposure–vulnerability for mapping heatwave risk and associated dominant dimensions in China","authors":"Jinping Liu,&nbsp;Tongchang Zhang,&nbsp;Yanqun Ren,&nbsp;Patrick Willems,&nbsp;Ali Mirchi,&nbsp;Arfan Arshad,&nbsp;Tie Liu,&nbsp;Quoc Bao Pham","doi":"10.1002/joc.8628","DOIUrl":"https://doi.org/10.1002/joc.8628","url":null,"abstract":"<p>In the context of global warming, the frequency, intensity, and duration of heatwave events have markedly increased, bearing profound implications for both natural ecosystems and human societies. To effectively cope with this challenge, it is imperative to accurately identify and comprehensively assess the risks posed by heatwaves. This study undertakes a systematic approach and robust methodology to assess heatwave risks by leveraging a diverse array of data sources—encompassing remote sensing, statistical analyses. The methodology integrates the risk triangle theory alongside established risk assessment frameworks laid out by the Intergovernmental Panel on Climate Change (IPCC). Employing a three-dimensional evaluation framework encompassing hazard, exposure, and vulnerability, we unravel spatial–temporal patterns, high-risk zones, and dominant dimensions of heatwave risks contributing to potential disasters. Results indicated that during 1999–2008, roughly 27% of the study areas were affected by high and above risk levels of heatwaves, and the areas with high and very high hazard, exposure, and vulnerability accounted for approximately 19.5%, 10%, and 32.5%, respectively. During 2009–2018, the proportion of areas with high and very high risk, hazard, and exposure increased to about 31%, 26%, and 14%, respectively, while the percentage of areas with high and very high vulnerability decreased to about 24.43%. Notably, Xinjiang and the western part of Northwestern China are characterized by hazard-dominant conditions, while Southern China's risk profile has shifted from 1999–2008 to 2009–2018 from high hazard and vulnerability conditions to a more complex interaction involving hazard, exposure, and vulnerability. Moreover, Northern China and the northern segment of Southwestern China exhibit simultaneous high-risk rankings across hazard, exposure, and vulnerability dimensions, forming a comprehensive high-risk zone. These findings characterize heatwave risk patterns and offer critical insights for risk management decisions, guiding effective disaster prevention and relief measures to ensure socio-economic stability and public health.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 14","pages":"5136-5155"},"PeriodicalIF":3.5,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Near-surface wind variability in Prydz Bay and Amery Ice Shelf region, East Antarctica: A four-decade SOM analysis 南极洲东部普里兹湾和阿梅里冰架地区的近地表风变化:四十年 SOM 分析
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-19 DOI: 10.1002/joc.8624
Lejiang Yu, Shiyuan Zhong, Enzhao Xiao, Tijun Zhang, Bo Sun
{"title":"Near-surface wind variability in Prydz Bay and Amery Ice Shelf region, East Antarctica: A four-decade SOM analysis","authors":"Lejiang Yu,&nbsp;Shiyuan Zhong,&nbsp;Enzhao Xiao,&nbsp;Tijun Zhang,&nbsp;Bo Sun","doi":"10.1002/joc.8624","DOIUrl":"https://doi.org/10.1002/joc.8624","url":null,"abstract":"<p>Near-surface wind fields in the Prydz Bay and Amery Ice Shelf region of East Antarctica play a crucial role in the formation and variability of Antarctic Bottom Water, a cold, dense water mass that sinks and spreads across the deep ocean basins influencing ocean circulation and modulating earth's climate system. This study investigates the primary modes of variability of these wind fields using the self-organizing map (SOM) method and data from the latest version of the European Centre for Medium-Range Weather Forecasts (ECMWF) ReAnalyses (ERA5), spanning four decades from 1979 to 2020. While the wind field climatology, characterized by small seasonal variation, is dominated by katabatic and large-scale forcing, the spatial patterns of the primary variability modes are mainly influenced by synoptic system activities. The overall trend in annual wind speed anomalies is positive across the study region, with the exception of the southwestern part and central Prydz Bay. However, significant trends are observed in only two out of nine SOM nodes (nodes 4 and 9), which collectively explain less than 30% of the averaged trends over the region. The interannual variability in the seasonal occurrences of certain nodes is linked to several well-known climate modes, including the El Niño–Southern Oscillation, the Southern Annular Mode and Zonal Wavenumber 3. Our results provide a reference for forecasting the occurrence frequency of specific patterns, which could help mitigate the impact of extreme wind events through improved forecasting.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 14","pages":"5075-5089"},"PeriodicalIF":3.5,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Human activities increased compound drought and heat events over China during 1961–2014 1961-2014 年间人类活动增加了中国上空的复合干旱和高温事件
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-19 DOI: 10.1002/joc.8625
Xiaoxin Wang, Xianmei Lang, Dabang Jiang
{"title":"Human activities increased compound drought and heat events over China during 1961–2014","authors":"Xiaoxin Wang,&nbsp;Xianmei Lang,&nbsp;Dabang Jiang","doi":"10.1002/joc.8625","DOIUrl":"https://doi.org/10.1002/joc.8625","url":null,"abstract":"<p>Compared to independent drought or extreme heat events, compound drought and heat events (CDHEs) can pose more adverse impacts on ecosystems and human society. As the anthropogenic influence on CDHEs in China remains largely unquantified, we analyse both observed and simulated changes in the occurrence of CDHEs over China from 1961 to 2014, and perform detection and attribution analyses utilizing an optimal fingerprinting method, based on observations, reanalysis data and numerical experiments from seven Coupled Model Intercomparison Project Phase 6 (CMIP6) models. Upward trends are found in observed CDHEs during 1961–2014 over the majority of China, especially in the last two decades. The increase in CDHEs is largely attributed to human influence. Anthropogenic forcing is detectable in the observed CDHEs changes in the whole China and its eastern region. Furthermore, a three-signal analysis indicates that greenhouse gases play a key role in increasing CDHEs over China, while natural forcing has a negligible effect. Anthropogenic aerosol emissions also play a detectable role in offsetting the greenhouse gas-induced increase of CDHEs over China.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 14","pages":"5090-5103"},"PeriodicalIF":3.5,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Unravelling the performance of atmospheric radiative transfer schemes in the simulation of mean surface climate in Central Africa using the RegCM5 climate model 利用 RegCM5 气候模型模拟中部非洲平均地表气候过程中大气辐射传输方案的性能解析
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-18 DOI: 10.1002/joc.8611
E. E. Djouka Kankeu, A. J. Komkoua Mbienda, P. C. Choumbou, G. M. Guenang, G. P. Demanou Koudjou, C. Mbane Mbioule
{"title":"Unravelling the performance of atmospheric radiative transfer schemes in the simulation of mean surface climate in Central Africa using the RegCM5 climate model","authors":"E. E. Djouka Kankeu,&nbsp;A. J. Komkoua Mbienda,&nbsp;P. C. Choumbou,&nbsp;G. M. Guenang,&nbsp;G. P. Demanou Koudjou,&nbsp;C. Mbane Mbioule","doi":"10.1002/joc.8611","DOIUrl":"https://doi.org/10.1002/joc.8611","url":null,"abstract":"<p>The theory of radiative transfer in the atmosphere is crucial in the study of climate, because radiative exchanges are at the origin of the atmospheric dynamics. It is therefore important to evaluate this phenomenon in order to be able to take effective measures to tackle climate change. The objective of this work is to evaluate the capability of the RegCM5 climate model to reproduce radiative transfer over Central Africa. The analysis is carried out over a 10-year period, from January 2002 to December 2011 preceded by 1 year as spin-up. RegCM5 model were evaluated using the ERA5 dataset for the radiative transfer parameters (the shortwave radiation [SWR], longwave radiation [LWR], cloud cover [CLT], surface albedo [ALB] and surface temperature), as well as CHIRPS dataset for precipitation. Three subregions were identified for more specific analysis of the model, namely the Sahel, Congo basin and Cameroon highlands. Two radiative schemes were used: the radiative scheme of the community climate model (CCM) and Rapid Radiative Transfer Model (RRTM). The assessment of radiative transfer parameters was carried out by examining their seasonal variability and annual cycles using data from two RegCM5 experiments, RegCM5-CCM3 and RegCM5-RRTM. Before this assessment, a sensibility analysis to convective schemes carried out with the default RegCM5 radiative scheme (CCM3) shows that Grell scheme with Arakawa and Shulber closure is the best scheme to represent key radiation parameters (LWR and SWR). This convective scheme is therefore used for assessing the two Radiative transfer schemes. Results show that both RegCM5 experiments simulate relatively well the variables linked to radiative transfer for the four seasons of the year. However, RegCM5 with RRTM as radiative scheme depicts better performance over all subregions and seasons, suggesting that the choice of this scheme does not depend on land cover, topography and rainfall regimes in a complex region such as Central Africa.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 13","pages":"4809-4828"},"PeriodicalIF":3.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Local climate and trends in air mass-based weather types over the Arabian Peninsula 阿拉伯半岛当地气候和以气团为基础的天气类型趋势
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-17 DOI: 10.1002/joc.8631
Ali S. Alghamdi, John Harrington Jr.
{"title":"Local climate and trends in air mass-based weather types over the Arabian Peninsula","authors":"Ali S. Alghamdi,&nbsp;John Harrington Jr.","doi":"10.1002/joc.8631","DOIUrl":"https://doi.org/10.1002/joc.8631","url":null,"abstract":"<p>Although previous research on climate change in the Arabian Peninsula (AP) has studied changes in individual meteorological variables, an analysis of changes in the overall weather conditions based on multiple meteorological variables is limited. Based on an air mass-based classification system, this research explored the local climate (1979–2023) of daily surface weather conditions (i.e., air masses) and associated changes over the Peninsula. For this purpose, the gridded weather typing classification (GWTC-2), an approach to classify multivariate surface weather situations relative to the average local climate, was utilized as it demonstrated outstanding performance in capturing daily weather characteristics in the Peninsula. Cold air mass (C), days with low temperature and near average humidity, was the most common cool weather type, with notable occurrences from Nov to Feb. Warm air mass (W), hot days with near average humidity, was the most common warm weather condition and maintained a marked presence throughout the year, with notable occurrences in summer. Coastal regions showed higher presences of humid warm (HW) and humid (H) days, whereas the central parts demonstrated higher occurrences of air masses of below-average humidity (dry [D], dry cold [DC], and dry warm [DW]). Much of the Peninsula showed high intra-annual variability in cool, warm, humid, and dry air masses. Findings from trend analysis reinforce findings from previous studies related to ongoing warming over the Peninsula, as cool weather types (DC, C, and HC) are becoming less frequent, while warm weather types (W, DW, and HW) are becoming more frequent. This analysis further detected decreases in the average weather conditions along with reduced duration of C-type and increases in the length of warm weather types, further aggravating thermal stress across the AP.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 14","pages":"5172-5191"},"PeriodicalIF":3.5,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Synergistic interactions between urban heat islands and heat waves in the Greater Kuala Lumpur and surrounding areas 大吉隆坡及周边地区城市热岛与热浪之间的协同互动关系
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-15 DOI: 10.1002/joc.8614
Sharifah Faridah Syed Mahbar, Hiroyuki Kusaka
{"title":"Synergistic interactions between urban heat islands and heat waves in the Greater Kuala Lumpur and surrounding areas","authors":"Sharifah Faridah Syed Mahbar,&nbsp;Hiroyuki Kusaka","doi":"10.1002/joc.8614","DOIUrl":"https://doi.org/10.1002/joc.8614","url":null,"abstract":"<p>The synergistic interactions between urban heat islands (UHI) and heat waves (HW) continue to be debated. Despite the expectations of UHI intensification during HW, several studies have demonstrated variations. Notably, there is a dearth of investigations concerning the UHI–HW synergy in tropical climate cities amidst the escalating trend of more frequent and severe HW in Southeast Asia. To address this gap, our study aimed to investigate the synergies between the UHI and HW phenomena in Greater Kuala Lumpur (GKL) and its surrounding areas. We employed the advanced research version 4.2.2 of the Weather Research and Forecasting (WRF) model, coupled with a single-layer Urban Canopy Model (UCM), to examine the impact of UHI during two heat wave events in 2016 (Case 1) and 2020 (Case 2), against the periods immediately before and after these events, which we refer to as Pre-Post HW (PPHW), in GKL. An elevated UHI intensity (UHII) was evident during the HW in both observations and simulations, with a noticeable distinction particularly observed in Case 1. During HW, observed data indicates average UHII peaks at 1.8°C (0100 LST (UTC+8)) and 1.7°C (1500 LST) in Cases 1 and 2, respectively. In contrast, those for PPHW days for Cases 1 and 2 are 1.5°C (0000 LST) and 1.2°C (0100 LST), respectively. The maximum observed heat loads are likely to occur at noon, reaching 2.3°C at 1600 LST in Case 1 and 3.7°C at 1500 LST in Case 2. LST stands for local standard time. Heat flux component analysis from the surface energy balance model confirmed the UHI–HW synergy. A notable difference in the Bowen Ratio between urban and rural areas highlights the effect of urbanisation on heat fluxes, potentially exacerbating urban discomfort during HW. Consistent across all measurement methods, the evidence indicates a clear and positive synergy between the UHI and HW in the GKL. This study can potentially deliver valuable insights, especially in urban planning, where the implications of weather events are substantial.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 13","pages":"4886-4906"},"PeriodicalIF":3.5,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Spatiotemporal changes in tourism climate comfort in Sichuan Province from 1961 to 2022 1961-2022年四川省旅游气候舒适度的时空变化
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-14 DOI: 10.1002/joc.8626
Hongguo Wang, Guohua Liu, Fangying Wu, Ziyu Chen
{"title":"Spatiotemporal changes in tourism climate comfort in Sichuan Province from 1961 to 2022","authors":"Hongguo Wang,&nbsp;Guohua Liu,&nbsp;Fangying Wu,&nbsp;Ziyu Chen","doi":"10.1002/joc.8626","DOIUrl":"https://doi.org/10.1002/joc.8626","url":null,"abstract":"<p>Based on the daily temperature, wind speed, relative humidity, sunshine hours and precipitation in Sichuan Province from 1961 to 2022, the spatiotemporal variation characteristics of tourism climate comfort in Sichuan Province were analysed using the temperature–humidity index (THI), precipitation index (<i>P</i>), sunshine duration index (SSD), wind chill index (WCI) and tourism climate index (TCI). The results show that the average annual TCI in Sichuan Province over the past 62 years is “acceptable” or above and shows a significant increasing trend at a rate of 0.018 per decade. On average, the best travel comfort period in Sichuan Province is from March to May and from October to November. The TCI increased significantly in cold seasons such as February and November with rates of 0.064 and 0.053 per decade, respectively. The increase in TCI is mainly controlled by the increase in THI and WCI, both of which are related to the increase in temperature, with a greater effect in cold seasons and at higher elevations. Most of China's 5A-level tourist attractions in Sichuan Province (14 of 17) have an annual TCI of “acceptable” or better. Similarly, the top 3 months for climate comfort at these attractions tend to be March to May and October, with ratings reaching “good” or even “very good.” For the other three destinations, all characterized by glaciers and mountains, the top 3 months for climate comfort are concentrated in the warm months. The overall tourism climate comfort of Sichuan Province is increasing, and the climate is changing in a positive way for the tourism industry.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 14","pages":"5104-5118"},"PeriodicalIF":3.5,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
China's Yangtze River basin is becoming the super heatwave centre in the East Asian monsoon regions 中国长江流域正成为东亚季风区的超级热浪中心
IF 3.5 3区 地球科学
International Journal of Climatology Pub Date : 2024-09-13 DOI: 10.1002/joc.8621
Jiang Wei, Ding Ting, Gao Hui, Lv Zhuozhuo
{"title":"China's Yangtze River basin is becoming the super heatwave centre in the East Asian monsoon regions","authors":"Jiang Wei,&nbsp;Ding Ting,&nbsp;Gao Hui,&nbsp;Lv Zhuozhuo","doi":"10.1002/joc.8621","DOIUrl":"https://doi.org/10.1002/joc.8621","url":null,"abstract":"<p>Different from the general heatwaves that mainly occur in southeastern China, the super heatwaves in China are concentrated mostly in the mid–lower reaches of the Yangtze River basin. Daily maximum temperature data over land from CPC/NOAA revealed that the basin has become the centre with the highest frequency increase of super heatwaves in the East Asian monsoon regions in the 21st century. Further analyses also indicted that the extent of super heatwaves in the basin has a much higher increasing rate than that of general heatwaves by using running thresholds. The westward extension of the western Pacific subtropical high (WPSH) plays the most dominant role. Statistical results suggested that a 10-gpm increment of the geopotential height (GPH) over the basin leads to a 0.43°C increase in the regionally averaged maximum temperature. Additionally, spatial extent of the super heatwave may expand by approximately 4%. In contrast to the stable eastern boundary of the North Africa high, the western boundary of the WPSH has significantly expanded westward in the 21st century. This expansion has led to the enhancement of the GPH over the Yangtze River basin, resulting in the super heatwave centre due to the heat-dome effect. Projections from 29 Coupled Model Intercomparison Project Phase 6 (CMIP6) models under moderate greenhouse gas emission scenario (SSP2-4.5) suggest that the GPH over the Yangtze River basin will continue to strengthen throughout the 21st century. This implies that the Yangtze River basin will continue to be the centre of super heatwaves in East Asia monsoon region.</p>","PeriodicalId":13779,"journal":{"name":"International Journal of Climatology","volume":"44 14","pages":"5028-5038"},"PeriodicalIF":3.5,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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