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Discussion on Collection of Precious Meteorological Archives under the Background of New Archives Law
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作者 Xiaobei LIU Xiao LIU +1 位作者 Yun CAI Song YUAN 《Meteorological and Environmental Research》 CAS 2023年第3期45-47,53,共4页
On January 1,2021,the newly revised Archives Law of the People's Republic of China(hereinafter referred to as the new Archives Law)was officially implemented,providing legal protection for archive management,archi... On January 1,2021,the newly revised Archives Law of the People's Republic of China(hereinafter referred to as the new Archives Law)was officially implemented,providing legal protection for archive management,archive work and archive undertaking in the new era.Starting from the relevant provisions of the new Archives Law,the collection of precious meteorological archives was discussed,and it is believed that only on the basis of clarifying the definition,collection responsibility subject,collection scope,ways and methods of precious meteorological archives can the relevant units be convenient to practice and obtain substantive collection effect. 展开更多
关键词 Archives Law Precious meteorological archives COLLECTION IDENTIFICATION
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Classification of yearly extreme precipitation events and associated flood risk in the Yangtze-Huaihe River Valley 被引量:11
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作者 Zhiqing XIE Yin DU +1 位作者 Yan ZENG Qian MIAO 《Science China Earth Sciences》 SCIE EI CAS CSCD 2018年第9期1341-1356,共16页
Fifty cases of regional yearly extreme precipitation events (RYEPEs) were identified over the Yangtze-Huaihe River Valley (YHRV) during 1979-2016 applying the statistical percentile method. There were five types o... Fifty cases of regional yearly extreme precipitation events (RYEPEs) were identified over the Yangtze-Huaihe River Valley (YHRV) during 1979-2016 applying the statistical percentile method. There were five types of RYEPEs, namely Yangtze Meiyu (YM-RYEPE), Huaihe Meiyu (HM-RYEPE), southwest-northeast-oriented Meiyu (SWNE-RYEPE) and typhoon I and II (TC-RYEPE) types of RYEPEs. Potential vorticity diagnosis showed that propagation trajectories of the RYEPEs along the Western Pacific Subtropical High and its steering flow were concentrated over the southern YHRV. As a result, the strongest and most frequently RYEPEs events, about 16-21 cases with average rainfall above 100 mm, occurred in the southern YHRV, particularly in the Nanjing metropolitan area. There have been 14 cases of flood-inducing RYEPEs since 1979, with the submerged area exceeding 120 km2 as simulated by the FloodArea hydraulic model, comprising six HM-RYEPEs, five YM- RYEPEs, two TC-RYEPEs, and one SWNE-RYEPE. The combination of evolving RYEPEs and rapid expansion of urban agglomeration is most likely to change the flood risk distribution over the Nanjing metropolitan area in the future. In the RCP6.0 (RCPS.5) scenario, the built-up area increases at a rate of about 10.41 km2 (10 yr)-t(24.67 km2 (10 yr)-1) from 2010 to 2100, and the area of high flood risk correspondingly increases from 3.86 km2(3.86 km2) to 9.00 kin2(13.51 km2). Areas of high flood risk are mainly located at Chishan Lake in Jurong, Lukou International Airport in Nanjing, Dongshan in Jiangning District, Lishui District and other low-lying areas. The accurate simulation of flood scenarios can help reduce losses due to torrential flooding and improve early warnings, evacuation planning and risk analysis. More attention should be paid to the projected high flood risk because of the concentrated population, industrial zones and social wealth throughout the Nanjing metropolitan area. 展开更多
关键词 Yangtze-Huaihe River Valley Extreme precipitation events FloodArea model Flood risk
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Impact of EnKF assimilating Himawari-8 all-sky infrared radiance on the forecasting of a warm-sector rainstorm event
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作者 Shanshan LOU Lei ZHU +3 位作者 Xuexing QIU Guangzhou CHEN Song YUAN Shengnan ZHOU 《Science China Earth Sciences》 SCIE EI CAS CSCD 2024年第10期3110-3127,共18页
Warm-sector rainstorms are highly localized events, with weather systems and triggering mechanisms are not obvious,leading to limited forecasting capabilities in numerical models. Based on the ensemble Kalman filter(P... Warm-sector rainstorms are highly localized events, with weather systems and triggering mechanisms are not obvious,leading to limited forecasting capabilities in numerical models. Based on the ensemble Kalman filter(PSU-En KF) assimilation system and the regional mesoscale model WRF, this study conducted a simulation experiment assimilating all-sky infrared(IR)radiance for a warm-sector rainstorm in East China and investigated the positive impact of assimilating the Himawari-8 moisture channel all-sky IR radiance on the forecast of the rainstorm. Results indicate that hourly cycling assimilation of all-sky IR radiance can significantly improve the forecast accuracy of this warm-sector rainstorm. There is a notable increase in the Threat Score(TS), with the simulated location and intensity of the 3-hour precipitation aligning more closely with observations. These improvements result from the assimilation of cloud-affected radiance, which introduces more mesoscale convective information into the model's initial fields. The adjustments include enhancements to the moisture field, such as increased humidity and moisture transport, and modifications to the wind field, including the intrusion of mid-level cold air and the strengthening of lowlevel convergent shear. These factors are critical in improving the forecast of this warm-sector rainstorm event. 展开更多
关键词 Ensemble Kalman filter WRF model Himawari-8 All-sky radiance Warm-sector rainstorm
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