Since the Beijing 2022 Winter Olympics was the first Winter Olympics in history held in continental winter monsoon climate conditions across complex terrain areas,there is a deficiency of relevant research,operational...Since the Beijing 2022 Winter Olympics was the first Winter Olympics in history held in continental winter monsoon climate conditions across complex terrain areas,there is a deficiency of relevant research,operational techniques,and experience.This made providing meteorological services for this event particularly challenging.The China Meteorological Administration(CMA)Earth System Modeling and Prediction Centre,achieved breakthroughs in research on short-and medium-term deterministic and ensemble numerical predictions.Several key technologies crucial for precise winter weather services during the Winter Olympics were developed.A comprehensive framework,known as the Operational System for High-Precision Weather Forecasting for the Winter Olympics,was established.Some of these advancements represent the highest level of capabilities currently available in China.The meteorological service provided to the Beijing 2022 Games also exceeded previous Winter Olympic Games in both variety and quality.This included achievements such as the“100-meter level,minute level”downscaled spatiotemporal resolution and forecasts spanning 1 to 15 days.Around 30 new technologies and over 60 kinds of products that align with the requirements of the Winter Olympics Organizing Committee were developed,and many of these techniques have since been integrated into the CMA’s operational national forecasting systems.These accomplishments were facilitated by a dedicated weather forecasting and research initiative,in conjunction with the preexisting real-time operational forecasting systems of the CMA.This program represents one of the five subprograms of the WMO’s high-impact weather forecasting demonstration project(SMART2022),and continues to play an important role in their Regional Association(RA)II Research Development Project(Hangzhou RDP).Therefore,the research accomplishments and meteorological service experiences from this program will be carried forward into forthcoming highimpact weather forecasting activities.This article provides an overview and assessment of this program and the operational national forecasting systems.展开更多
Time:2008Place:BeijingCharacters:Beibei,Jingjing,Huanhuan,Yingying,Nini,Some kids,Storyteller Scene I:We are FuwaStoryteller: Look,five lovely little friends—Fuwa are coming.
This paper presents a comparison and analysis method of data at traffic meteorological observation station during Beijing Winter Olympic Games period based on Grubbs criterion. By comparing the data of a set of standa...This paper presents a comparison and analysis method of data at traffic meteorological observation station during Beijing Winter Olympic Games period based on Grubbs criterion. By comparing the data of a set of standard multi-element observation stations with the data of multiple measured traffic stations, the outliers of each element data at each station were analyzed. It could provide data support for the maintenance of Zhangjiakou traffic meteorological observation station and a guarantee for the accuracy of forest service during Beijing Winter Olympic Games period.展开更多
On the occasion of the XXIX Olympic Games,the ambassadors from foreign countries in Beijing sent their messages to China's For- eign Trade to express their best wishes for the exciting and grand event, so we open ...On the occasion of the XXIX Olympic Games,the ambassadors from foreign countries in Beijing sent their messages to China's For- eign Trade to express their best wishes for the exciting and grand event, so we open the special column'Wishes for Beijing Olympic Games'for expressing these sincere congratulations.One World One Dream. Let's wish a great success to Beijing Olympic Games and Paralympic Games and carry forward the spirit of Olympics together.展开更多
Conversation 服务生:请坐!这是菜谱,想吃点儿什么? Fú wù shēng:Qǐng zuò!Zhè shì càipǔ,xiǎng chīdiǎnr shénme? Waiter:Please take a seat.Here is the menu.May I take your order now?...Conversation 服务生:请坐!这是菜谱,想吃点儿什么? Fú wù shēng:Qǐng zuò!Zhè shì càipǔ,xiǎng chīdiǎnr shénme? Waiter:Please take a seat.Here is the menu.May I take your order now? 家明:吉瑞,你喜欢吃中餐还是西餐?展开更多
It was back in 1908 when the Olympic dream began to take hold. This year, in 2008, this centennial dream has come true. Regarding it as a hard-won opportunity, China has all along wished to host the most successful
Sponsored by Beijing Tour Administration,co-organized by Singapore Conference and Exhibition Administration Service Co.,Ltd.and Beijing Relation Exhibition Co.,Ltd.,“2007 Beijing International Tour Expo”was held in ...Sponsored by Beijing Tour Administration,co-organized by Singapore Conference and Exhibition Administration Service Co.,Ltd.and Beijing Relation Exhibition Co.,Ltd.,“2007 Beijing International Tour Expo”was held in Beijing in June.Commissioner Du Jiang gave a presentation with the opening ceremmony,and pointed out that with the theme of“Tasting Beijing,Approaching Olympic Games”,the expo was a platform of promoting the communication and cooperation between the Chinese and foreign tourism industries.展开更多
2005年6月26日,北京2008年奥运会主题口号发布仪式在北京工人体育馆举行。中共中央政治局常委李长春出席仪式并发布了“同一个世界同一个梦想”(One World, One Dream )的主题口号。中共中央政治局委员、北京市委书记、北京奥组委主席...2005年6月26日,北京2008年奥运会主题口号发布仪式在北京工人体育馆举行。中共中央政治局常委李长春出席仪式并发布了“同一个世界同一个梦想”(One World, One Dream )的主题口号。中共中央政治局委员、北京市委书记、北京奥组委主席刘淇主持仪式并致辞。展开更多
The exhibition co-sponsored by the China Association for Preservation and Development of Tibetan Culture and the Government of Garze Tibetan Autonomous Prefecture in Sichuan Province was held from July 30th to August ...The exhibition co-sponsored by the China Association for Preservation and Development of Tibetan Culture and the Government of Garze Tibetan Autonomous Prefecture in Sichuan Province was held from July 30th to August 30th in the Beijing Ethnic Culture Palace.展开更多
At the advent of the grand opening of the 29th Olympiad in Beijing,with the entire world watching,on behalf of the Standardization Administration of the People’s Republic of China,I would like to extend our kind rega...At the advent of the grand opening of the 29th Olympiad in Beijing,with the entire world watching,on behalf of the Standardization Administration of the People’s Republic of China,I would like to extend our kind regards to the standardization professionals in China and around the展开更多
Weather forecasting for the Zhangjiakou competition zone of the Beijing 2022 Winter Olympic Games is a challenging task due to its complex terrain.Numerical weather prediction models generally perform poorly for cold ...Weather forecasting for the Zhangjiakou competition zone of the Beijing 2022 Winter Olympic Games is a challenging task due to its complex terrain.Numerical weather prediction models generally perform poorly for cold air pools and winds over complex terrains,due to their low spatiotemporal resolution and limitations in the description of dynamics,thermodynamics,and microphysics in mountainous areas.This study proposes an ensemble-learning model,named ENSL,for surface temperature and wind forecasts at the venues of the Zhangjiakou competition zone,by integrating five individual models—linear regression,random forest,gradient boosting decision tree,support vector machine,and artificial neural network(ANN),with a ridge regression as meta model.The ENSL employs predictors from the high-resolution ECMWF model forecast(ECMWF-HRES) data and topography data,and targets from automatic weather station observations.Four categories of predictors(synoptic-pattern related fields,surface element fields,terrain,and temporal features) are fed into ENSL.The results demonstrate that ENSL achieves better performance and generalization than individual models.The root-mean-square error(RMSE) for the temperature and wind speed predictions is reduced by 48.2% and 28.5%,respectively,relative to ECMWF-HRES.For the gust speed,the performance of ENSL is consistent with ANN(best individual model) in the whole dataset,whereas ENSL outperforms on extreme gust samples(42.7% compared with 38.7% obtained by ECMWF-HRES in terms of RMSE reduction).Sensitivity analysis of predictors in the four categories shows that ENSL fits their feature importance rankings and physical explanations effectively.展开更多
基金This work was jointly supported by the National Natural Science Foundation of China(Grant Nos.41975137,42175012,and 41475097)the National Key Research and Development Program(Grant No.2018YFF0300103).
文摘Since the Beijing 2022 Winter Olympics was the first Winter Olympics in history held in continental winter monsoon climate conditions across complex terrain areas,there is a deficiency of relevant research,operational techniques,and experience.This made providing meteorological services for this event particularly challenging.The China Meteorological Administration(CMA)Earth System Modeling and Prediction Centre,achieved breakthroughs in research on short-and medium-term deterministic and ensemble numerical predictions.Several key technologies crucial for precise winter weather services during the Winter Olympics were developed.A comprehensive framework,known as the Operational System for High-Precision Weather Forecasting for the Winter Olympics,was established.Some of these advancements represent the highest level of capabilities currently available in China.The meteorological service provided to the Beijing 2022 Games also exceeded previous Winter Olympic Games in both variety and quality.This included achievements such as the“100-meter level,minute level”downscaled spatiotemporal resolution and forecasts spanning 1 to 15 days.Around 30 new technologies and over 60 kinds of products that align with the requirements of the Winter Olympics Organizing Committee were developed,and many of these techniques have since been integrated into the CMA’s operational national forecasting systems.These accomplishments were facilitated by a dedicated weather forecasting and research initiative,in conjunction with the preexisting real-time operational forecasting systems of the CMA.This program represents one of the five subprograms of the WMO’s high-impact weather forecasting demonstration project(SMART2022),and continues to play an important role in their Regional Association(RA)II Research Development Project(Hangzhou RDP).Therefore,the research accomplishments and meteorological service experiences from this program will be carried forward into forthcoming highimpact weather forecasting activities.This article provides an overview and assessment of this program and the operational national forecasting systems.
文摘Time:2008Place:BeijingCharacters:Beibei,Jingjing,Huanhuan,Yingying,Nini,Some kids,Storyteller Scene I:We are FuwaStoryteller: Look,five lovely little friends—Fuwa are coming.
文摘This paper presents a comparison and analysis method of data at traffic meteorological observation station during Beijing Winter Olympic Games period based on Grubbs criterion. By comparing the data of a set of standard multi-element observation stations with the data of multiple measured traffic stations, the outliers of each element data at each station were analyzed. It could provide data support for the maintenance of Zhangjiakou traffic meteorological observation station and a guarantee for the accuracy of forest service during Beijing Winter Olympic Games period.
文摘On the occasion of the XXIX Olympic Games,the ambassadors from foreign countries in Beijing sent their messages to China's For- eign Trade to express their best wishes for the exciting and grand event, so we open the special column'Wishes for Beijing Olympic Games'for expressing these sincere congratulations.One World One Dream. Let's wish a great success to Beijing Olympic Games and Paralympic Games and carry forward the spirit of Olympics together.
文摘Conversation 服务生:请坐!这是菜谱,想吃点儿什么? Fú wù shēng:Qǐng zuò!Zhè shì càipǔ,xiǎng chīdiǎnr shénme? Waiter:Please take a seat.Here is the menu.May I take your order now? 家明:吉瑞,你喜欢吃中餐还是西餐?
文摘It was back in 1908 when the Olympic dream began to take hold. This year, in 2008, this centennial dream has come true. Regarding it as a hard-won opportunity, China has all along wished to host the most successful
文摘Sponsored by Beijing Tour Administration,co-organized by Singapore Conference and Exhibition Administration Service Co.,Ltd.and Beijing Relation Exhibition Co.,Ltd.,“2007 Beijing International Tour Expo”was held in Beijing in June.Commissioner Du Jiang gave a presentation with the opening ceremmony,and pointed out that with the theme of“Tasting Beijing,Approaching Olympic Games”,the expo was a platform of promoting the communication and cooperation between the Chinese and foreign tourism industries.
文摘The exhibition co-sponsored by the China Association for Preservation and Development of Tibetan Culture and the Government of Garze Tibetan Autonomous Prefecture in Sichuan Province was held from July 30th to August 30th in the Beijing Ethnic Culture Palace.
文摘At the advent of the grand opening of the 29th Olympiad in Beijing,with the entire world watching,on behalf of the Standardization Administration of the People’s Republic of China,I would like to extend our kind regards to the standardization professionals in China and around the
基金Supported by the National Key Research and Development Program of China (2018YDD0300104)Key Research and Development Program of Hebei Province of China (21375404D)After-Action-Review Project of China Meteorological Administration(FPZJ2023-014)。
文摘Weather forecasting for the Zhangjiakou competition zone of the Beijing 2022 Winter Olympic Games is a challenging task due to its complex terrain.Numerical weather prediction models generally perform poorly for cold air pools and winds over complex terrains,due to their low spatiotemporal resolution and limitations in the description of dynamics,thermodynamics,and microphysics in mountainous areas.This study proposes an ensemble-learning model,named ENSL,for surface temperature and wind forecasts at the venues of the Zhangjiakou competition zone,by integrating five individual models—linear regression,random forest,gradient boosting decision tree,support vector machine,and artificial neural network(ANN),with a ridge regression as meta model.The ENSL employs predictors from the high-resolution ECMWF model forecast(ECMWF-HRES) data and topography data,and targets from automatic weather station observations.Four categories of predictors(synoptic-pattern related fields,surface element fields,terrain,and temporal features) are fed into ENSL.The results demonstrate that ENSL achieves better performance and generalization than individual models.The root-mean-square error(RMSE) for the temperature and wind speed predictions is reduced by 48.2% and 28.5%,respectively,relative to ECMWF-HRES.For the gust speed,the performance of ENSL is consistent with ANN(best individual model) in the whole dataset,whereas ENSL outperforms on extreme gust samples(42.7% compared with 38.7% obtained by ECMWF-HRES in terms of RMSE reduction).Sensitivity analysis of predictors in the four categories shows that ENSL fits their feature importance rankings and physical explanations effectively.
