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| 1 | Growing Operational Use of FY-3 Data in the ECMWF System显示文摘This paper reviews the data quality and impact of observations from the FY-3 satellite series used operationally in the ECMWF system. This includes data from the passive microwave radiometers MWHS-1, MWHS-2 and MWRI, as well as observations from the radio occultation receiver GNOS. Evaluations against background equivalents show that the quality of the observations is broadly comparable to that of similar instruments on other polar-orbiting satellites, even though biases for the passive microwave observations can be somewhat larger and more complex for some channels. An observing system experiment shows that the FY-3 instruments jointly contribute significantly to the forecast skill in the ECMWF system. Positive impact of up to 2% is seen for most variables out to the day-2 forecasts over hemispheric scales, with significant benefits for total column water vapor or for temperature and wind in the stratosphere out to day 4. | Niels BORMANN David DUNCAN Stephen ENGLISH Sean HEALY Katrin LONITZ Keyi CHEN Heather LAWRENCE Qifeng LU | 2021 | Advances in Atmospheric Sciences2021，38，8： | 3 |
| 2 | Tree-ring δ^(15)N of Qinghai spruce in the central Qilian Mountains of China:Is pre-treatment of wood samples necessary?显示文摘A knowledge of the tree-ring stable nitrogen isotope ratio(δ^(15)N)can deepen our understanding of forest ecosystem dynamics by indicating the long-term availability,cycling and sources of nitrogen(N).However,the radial mobility of N blurs the interannual variations in the long-term N records.Previous studies of the chemical extraction of tree rings before analysis had produced inconsistent results and it is still unclear whether it is necessary to pre-treat wood samples from specific tree species to remove soluble N compounds before determining theδ^(15)N values.We compared the effects of pre-treatment with organic solvents and hot ultrapure water on the N concentration andδ^(15)N of tree rings from endemic Qinghai spruce(Picea crassifolia)growing in the interior of the central Qilian Mountains,China,during the last 60 a.We assessed the effects of different preparation protocols on the removal of the labile N compounds and investigated the need to pre-treat wood samples before determining theδ^(15)N values of tree rings.Increasing trends of the tree-ring N concentration were consistently observed in both the extracted and unextracted wood samples.The total N removed by extraction with organic solvents was about 17.60%,with a significantly higher amount in the sapwood section(P<0.01).Theδ^(15)N values of tree rings decreased consistently from 1960 to 2019 in both the extracted and unextracted wood samples.Extraction with organic solvents increased theδ^(15)N values markedly by about 5.2‰and reduced the variations in theδ^(15)N series.However,extraction with hot ultrapure water had little effect,with only a slight decrease in theδ^(15)N values of about 0.5‰.Our results showed that the radial pattern in the inter-ring movement of N in Qinghai spruce was not minimized by extraction with either organic solvents or hot ultrapure water.It is unnecessary to conduct hot ultrapure water extraction for the wood samples from Qinghai spruce because of its negligible effect on the removal of the labile N.Theδ^(15)N variation trend of tree rings in the unextracted wood samples was not influenced by the heartwood-sapwood transition zone.We suggest that theδ^(15)N values of the unextracted wood samples of the climate-sensitive Qinghai spruce could be used to explore the ecophysiological dynamics while focusing on the long-term variations. | WANG Ziyi LIU Xiaohong WANG Keyi ZENG Xiaomin ZHANG Yu GE Wensen KANG Huhu LU Qiangqiang | 2022 | Journal of Arid Land2022，14，6： | 1 |
| 3 | The value of SPECT/CT fusion imaging in the whole-body bone scan 显示文摘 | Wang Jin Lu Keyi Li Xianfeng | 2009 | Journal of Nuclear Medicine2009，50，5： | 1 |
| 4 | Detect Peripheral Hardware Faults Using I/O-state-based Dynamic Value Invariants显示文摘 | ZHENG Yansong LU Junlin TONG Dong WANG Keyi CHENG Xu | 2012 | Chinese Journal of Electronics2012，21，2： | 0 |
| 5 | Research on the Impact of VR Technology Application on Red Tourism in Jiangxi Province显示文摘Jiangxi Province is rich in red tourism resources.However,its current situation in the development of red culture and the combination of tourism and VR technology is not optimistic.This paper takes the subsequent development of Jiangxi red tourism as the research object and looks through the historical background of Jiangxi red resources to analyze the current situation of the Jiangxi red tourism.In the meantime,it explores and investigates the current situation of the development of VR technology in Jiangxi,the degree of the combination between theory with practice and the possibility of VR technology application.On this basis,it studies how to reasonably apply VR technology to promote the sustainable development of red tourism in Jiangxi,how to pull the economic growth of Jiangxi,and how to achieve a win-win scenario for the modern economy and traditional culture of Jiangxi. | WANG Keyi LU Yang CAI Yiwen CHEN Wenjie ZHOU Guang ZHOU Siyi | 2022 | Journal of Tourism and Hospitality Management2022，10，2： | 0 |
| 6 | Carboniferous integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas显示文摘During the Carboniferous Period,the Qinghai-Tibetan Plateau and its surrounding areas were located in quite different paleogeographic positions with various sedimentary and biological types.It is important to systematically compile and summarize the Carboniferous strata and biotas of the Qinghai-Tibetan Plateau and its surrounding areas,to establish an integrated stratigraphic framework for correlation,and to reconstruct the paleogeography for correctly understanding the breakup of the Gondwana Continent and the evolution of the Paleo-Tethys Ocean in the Late Paleozoic.The Carboniferous of the Qinghai-Tibetan Plateau and its surrounding areas can be subdivided into the Gondwanan,Cimmerian,and Tethyan types.The Gondwanan-type Carboniferous are distributed in the North Himalayan,Kangmar-Lhunze,and Zanda-Zumba regions of the South Tibet Subprovince and northern India-Pakistan Area,where only the Mississippian is developed and the biota is of Gondwanan affinity.The Cimmerian-type Carboniferous,which are found in the Baoshan,Tengchong,Coqen-Xainza,LhasaZayu,Nagqu-Biru,and South Qiangtang regions,as well as Shan-Thai and South Afghanistan-Pamir areas,also represent only the Mississippian strata,but their biota is characterized by mixed characters of European,South China,Australian,and North American types.The Tethyan-type Carboniferous are distributed in the Tanggula Mountains,Hoh Xil-Bayanhar,ChamdoHengduanshan,Tiekelike,West Kunlun,Karakorum,East Kunlun-Central Qinling,and Qilian regions,where the Carboniferous succession is well developed,and the biota is of warm-water Tethyan affinity.The biostratigraphical correlation of the Gondwanan-type and Cimmerian-type Carboniferous is based mainly on conodonts and additionally on brachiopods and rugose corals.The Mississippian of the Tethyan-type Carboniferous is correlated mainly by using rugose corals and brachiopods,whereas in the Pennsylvanian foraminifera(fusuline)and conodonts are regarded as primary fossil groups,subordinated by rugose corals and brachiopods.Adhering to the International standard chronostratigraphy of the Carboniferous,we have reconstructed a framework of the litho-and biostratigraphic subdivision and correlation of the Qinghai-Tibetan Plateau and its surrounding areas.Further studies should focus on isotope geochronology,geochemistry,paleoclimates,and paleoenvironments of the Carboniferous in the Qinghai-Tibetan Plateau and its surrounding areas. | Keyi HU Xiangdong WANG Wenqi WANG Yingfan SONG Xunyan YE Lu LI Yukun SHI Sunrong YANG Ying LI | 2024 | Science China Earth Sciences2024，67，4： | 0 |
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