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Solar-wind–magnetosphere energy influences the interannual variability of the northern-hemispheric winter climate

National Science Review 2020年第1期7卷 141-148页

作者： Shengping He huijun wang Fei Li Hui Li Chi wang Geophysical institute University of Bergen and Bjerknes Center for Climate Research Key Laboratory of Meteorological Disaster/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Climate Change Research Center Chinese Academy of Sciences Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Norwegian institute for Air Research State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences

Solar irradiance has been universally acknowledged to be dominant by quasi-decadal variability, which has been adopted frequently to investigate its effect on climate decadal variability. As one major terrestrial energy source, solar-wind energy flux into Earth’s magnetosphere(Ein) exhibits dramatic interannual variation, the effect of which on Earth’s climate, however, has not drawn much attention. Based on the Einestimated by 3D magnetohydrodynamic simulations, we demonstrate a novelty that the annual mean Eincan explain up to 2.% total interannual variance of the northern-hemispheric temperature in the subsequent boreal winter. The concurrent anomalous atmospheric circulation resembles the positive phase of Arctic Oscillation/North Atlantic Oscillation. The warm anomalies in the tropic stratopause and tropopause induced by increased solar-wind–magnetosphere energy persist into the subsequent *** to the dominant change in the polar vortex and mid-latitude westerly in boreal winter, a ‘top-down’propagation of the stationary planetary wave emerges in the Northern Hemisphere and further influences the atmospheric circulation and climate.

关键词： solar wind winter climate interannual variability stratosphere

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The First Global Map of atmospheric Ammonia(NH_(3)) as Observed by the HIRAS/FY-3D Satellite

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Advances in atmospheric Sciences 2024年第3期41卷 379-390页

作者： Minqiang ZHOU Zhili DENG Charles ROBERT Xingying ZHANG Lu ZHANG Yapeng wang Chengli QI Pucai wang Martine De MAZIÈRE institute of atmospheric {2. Chinese Academy of SciencesBeijing 100029China Royal Belgian institute for Space Aeronomy(BIRA-IASB) Brussels 1180Belgium National Satellite Meteorology Center China Meteorological AdministrationBeijing 100081China Department of Science&Technology and Climate Change China Meteorological AdministrationBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China

atmospheric ammonia(NH_(3)) is a chemically active trace gas that plays an important role in the atmospheric environment and climate change. Satellite remote sensing is a powerful technique to monitor NH_(3) concentration based on the absorption lines of NH_(3) in the thermal infrared region. In this study, we establish a retrieval algorithm to derive the NH_(3)column from the Hyperspectral Infrared atmospheric Sounder(HIRAS) onboard the Chinese Feng Yun(FY)-3D satellite and present the first atmospheric NH_(3) column global map observed by the HIRAS instrument. The HIRAS observations can well capture NH_(3) hotspots around the world, e.g., India, West Africa, and East china, where large NH_(3) emissions exist. The HIRAS NH_(3) columns are also compared to the space-based Infrared atmospheric Sounding Interferometer(IASI)measurements, and we find that the two instruments observe a consistent NH_(3) global distribution, with correlation coefficient(R) values of 0.2.–0.73. Finally, some remaining issues about the HIRAS NH_(3) retrieval are discussed.

关键词： ammonia HIRAS/FY-3D satellite thermal-infrared observation remote sensing optimal estimation method

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Strengthened Relationship between the Antarctic Oscillation and ENSO After the Mid-1990s during Austral Spring

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Advances in atmospheric Sciences 2017年第1期34卷 54-65页

作者： Tingting HAN huijun wang Jianqi SUN Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Climate Change Research Center Chinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of EducationNanjing University for Information Science and TechnologyNanjing 210044China University of Chinese Academy of Sciences Beijing 100049China

This paper documents a decadal strengthened co-variability of the Antarctic Oscillation （AAO） and ENSO in austral spring after the mid-1990s. During the period 1979-93, the ENSO （AAO） spatial signatures are restricted to the tropicsmidlatitudes （Antarctic-midlatitudes） of the Southern Hemisphere （SH）, with a weak connection between the two oscillations. Comparatively, after the mid-1990s, the E1 Nifio-related atmospheric anomalies project on a negative AAO pattern with a barotropic structure in the mid-high latitudes of the SH. The expansion of E1 Nifio-related air temperature anomalies have a heightened impact on the meridional thermal structure of the SH, contributing to a weakened circumpolar westerly and strengthened subtropical jet. Meanwhile, the ENSO-related southern three-cell circulations expand poleward and then strongly couple the Antarctic and the tropics. Numerical simulation results suggest that the intensified connection between ENSO and SST in the South Pacific since the mid-1990s is responsible for the strengthened AAO-ENSO relationship.

关键词： ENSO Antarctic Oscillation South Pacific SST austral spring decadal change

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Relationship between Hadley circulation and sea ice extent in the Bering Sea

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Chinese Science Bulletin 2008年第3期53卷 444-449页

作者： ZHOU Bomao wang huijun National Climate Center China Meteorological Administration Beijing 100081 China Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The linkage between Hadley circulation(HC)and sea ice extent in the Bering Sea during March-April is investigated through an analysis of observed data in this *** is found that HC is negatively correlated to the sea ice extent in the Bering Sea,namely,strong(weak)HC is corresponding to less(more)sea ice in the Bering *** present study also addresses the large-scale atmospheric general circulation changes underlying the relationship between HC and sea ice in the Bering *** follows that a positive phase of HC corresponds to westward located Aleutian low,anomalous southerlies over the eastern North Pacific and higher temperature in the Bering Sea,providing unfavorable atmospheric and thermal conditions for the sea ice forming,and thus sea ice extent in the Bering Sea is decreased,and vice *** addition,it is further identified that East Asian-North Pacific-North America telecon-nection may play an important role in linking HC and changes of atmospheric circulations as well as sea ice in the Bering Sea.

关键词：白令海哈德利洋流海冰大气循环远程并置对比

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Weakening relationship between East Asian winter monsoon and ENSO after mid-1970s

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Chinese Science Bulletin 2012年第27期57卷 3535-3540页

作者： wang huijun HE ShengPing Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Climate Change Research Center Chinese Academy of SciencesBeijing 100029China Graduate University of Chinese Academy of Sciences Beijing 100049China

The East Asian winter monsoon(EAWM) is characterized by the frequent cold surges and associated closely with the Siberia High,East Asian Trough,and high-level westerly jet *** ENSO cycle can modulate the EAWM since it has co-variability with the sea surface temperature over the Indo-Western-Pacific which can tune the land-sea thermal contrast for the *** paper,by analyzing the EAWM,ENSO,and associated atmosphere-ocean variability,documents the weakening of the EAWMENSO relationship after the *** significant out-of-phase inter-relationship is found to be diminished after the *** study in this work suggests that the weakened co-variability of the tropical Indo-Western-Pacific climate associated with ENSO after the 1970s is partly responsible for the weakened ***,the reduced EAWM interannual variability and northward retreat of the EAWM-associated climate variability are favorable to the weakened ENSO-EAWM connection.

关键词： ENSO循环东亚冬季风年代热带印度洋中期西太平洋气候变化海表面温度

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Springtime Convective Quasi-Biweekly Oscillation and Interannual Variation of Its Intensity over the South china Sea and Western North Pacific

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Journal of Meteorological Research 2019年第2期33卷 323-335页

作者： Zhiqing XU Ke FAN huijun wang Nansen–Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences University of the Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science &Technology

This study investigates characteristics of the convective quasi-biweekly oscillation(QBWO) over the South china Sea(SCS) and western North Pacific(WNP) in spring, and the interannual variation of its intensity. Convective QBWO over the WNP and SCS shows both similarities and differences. Convective QBWO over the WNP originates mainly from southeast of the Philippine Sea and propagates northwestward. In contrast, convective QBWO over the SCS can be traced mainly to east of the Philippines and features a westward propagation. Such a westward or northwestward propagation is probably related to n = 1 equatorial Rossby waves. During the evolution of convective QBWO over the WNP and SCS, the vertical motion and specific humidity exhibit a barotropic structure and the vertical relative vorticity shows a baroclinic structure in the troposphere. The dominant mode of interannual variation of convective QBWO intensity over the SCS–WNP region in spring is homogeneous. Its positive phase indicates enhanced convective QBWO intensity accompanied by local enhanced QBWO intensity of vertical motion throughout the troposphere as well as local enhanced(weakened) QBWO intensity of kinetic energy, vertical relative vorticity,and wind in the lower(upper) troposphere. The positive phase usually results from local increases of the background moisture and anomalous vertical shear of easterlies. The latter contributes to the relationship between the dominant mode and QBWO intensities of kinetic energy, vertical relative vorticity, and wind. Finally, a connection between the dominant mode and the sea surface temperature anomalies in the tropical Pacific Ocean is demonstrated.

关键词： convective quasi-biweekly oscillation interannual variation South china Sea western North Pacific spring

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Meteorological influences on co-occurrence of O_(3) and PM_(2.5)pollution and implication for emission reductions in beijing-Tianjin-Hebei

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Science china Earth Sciences 2023年第6期66卷 1258-1267页

作者： Xiaoqing MA Zhicong YIN Bufan CAO huijun wang Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing 210044China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Co-occurrence of surface ozone(O_(3))and fine particulate matter(PM_(2.5))pollution(CP)was frequently observed in beijing-Tianjin-Hebei(BTH).More than 50%of CP days occurred during April-May in BTH,and the CP days reached up to 11 in two months of *** PM_(2.5)or O_(3) concentration associated with CP was lower than but close to that in O_(3) and PM_(2.5)pollution,indicating compound harms during CP days with double-high concentrations of PM_(2.5)and O_(3).CP days were significantly facilitated by joint effects of the Rossby wave train that consisted of two centers associated with the Scandinavia pattern and one center over North china as well as a hot,wet,and stagnant environmental condition in *** 2.18,the number of CP days decreased sharply while the meteorological conditions did not change ***,changes in meteorological conditions did not really contribute to the decline of CP days in 2.19 and *** implies that the reduction of PM_(2.5)emission has resulted in a reduction of CP days(about 11 days in 2.19 and 2.2.).The differences in {2. conditions revealed here were helpful to forecast the types of air pollution on a daily to weekly time *** reduction in PM_(2.5)emission was the main driving factor behind the absence of CP days in 2.2.,but the control of surface O_(3) must be stricter and deeper.

关键词： Co-occurrence pollution Ozone PM_(2.5) Meteorology Emission reduction

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Decadal co-variability of the summer surface air temperature and soil moisture in china under global warming

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Chinese Science Bulletin 2007年第11期52卷 1559-1565页

作者： SU MingFeng wang huijun Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The self-calibrating Palmer Drought Severity Index (PDSI) is calculated using newly updated ground observations of monthly surface air temperature (SAT) and precipitation in china. The co-variabilities of PDSI and SAT are examined for summer for the period 1961-2.04. The results show that there exist decadal climate co-variabilities and strong nonlinear interactions between SAT and soil moisture in many regions of china. Some of the co-variabilities can be linked to global warming. In summer,sig-nificant decadal co-variabilities from cool-wet to warm-dry conditions are found in the east region of Northwest china,North china,and Northeast china. An important finding is that in the west region of Northwest china and Southeast china,pronounced decadal co-variabilities take place from warm-dry to cool-wet conditions. Because significant warming was observed over most areas of the global land surface during the past 2.-30 years,the shift to cool-wet conditions is a unique phenomenon which may deserve much scientific attention. The nonlinear interactions between SAT and soil moisture may partly account for the observed decadal co-variabilities. It is shown that anomalies of SAT will greatly affect the climatic co-variabilities,and changes of SAT may bring notable influence on the PDSI in china. These results provide observational evidence for increasing risks of decadal drought and wet-ness as anthropogenic global warming progresses.

关键词：联合可变性土壤湿度表面空气温度自校准器

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Simulated change in the near-surface soil freeze/thaw cycle on the Tibetan Plateau from 1981 to 2.10

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Chinese Science Bulletin 2014年第20期59卷 2439-2448页

作者： Donglin Guo huijun wang Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences

The near-surface freeze/thaw cycle in cold regions plays a major role in the surface energy budget,hydrological activity,and terrestrial *** this study,the Community Land Model,Version 4 and a suite of high-resolution atmospheric data were used to investigate the changes in the near-surface soil freeze/thaw cycle in response to the warming on the Tibetan Plateau from1981 to *** in situ observations-based validation showed that,considering the cause of scale mismatch in the comparison,the simulated soil temperature,freeze start and end dates,and freeze duration at the near-surface were *** response to the warming of the Tibetan Plateau at a rate of approximately 0.44°C decade-1,the freeze start-date became delayed at an area-mean rate of1.7 days decade-1,while the freeze end-date became advanced at an area-mean rate of 4.7 days *** delaying of the freeze start-date,which was combined with the advancing of the freeze end-date,resulted in a statistically significant shortening trend with respect to the freeze duration,at an area-mean rate of 6.4 days *** changes would strongly affect the surface energy flux,hydrological processes,and vegetation *** also found that the rate of freeze-duration shortening at the near-surface soil layer was approximately 3.0 days decade-1lower than that at a depth of 1 *** implied that the changes in soil freeze/thaw cycles at the near surface cannot be assumed to reflect the situation in deeper soil *** significant correlations between freeze duration and air temperature indicated that the shortening of the near-surface freeze duration was caused by the rise in air temperature,which occurred especially in spring,followed by *** results can be used to reveal the laws governing the response of the near-surface freeze/thaw cycle to climate change and indicate related changes in permafrost.

关键词：土壤冻结青藏高原近地表解冻周期模拟冷冻时间陆地生态系统

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基于注意力机制LSTM的电离层TEC预测

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地球物理学报 2024年第2期67卷 439-451页

作者：刘海军雷东兴袁静乐会军单维锋李良超王浩然李忠袁国铭防灾科技学院河北廊坊065201 中国科学院地质与地球物理研究所中国科学院地球与行星物理重点实验室北京100029

电离层总电子含量(Total Electron Content,TEC)的监测与预报是空间环境研究的重要内容,对卫星通讯和导航定位等有重要意义.TEC值影响因素较多,很难确定精确物理模型来对其进行预测.本文设计了基于注意力机制的LSTM模型(Att-LSTM),采用... 详细信息

电离层总电子含量(Total Electron Content,TEC)的监测与预报是空间环境研究的重要内容,对卫星通讯和导航定位等有重要意义.TEC值影响因素较多,很难确定精确物理模型来对其进行预测.本文设计了基于注意力机制的LSTM模型(Att-LSTM),采用过去2.小时TEC观测数据对未来TEC进行预测.选择北半球东经100°上,每2.5°纬度选择一个位置,共计36个位置来验证本文提出模型的性能,并与主流的深度学习模型如DNN、RNN、LSTM进行对比实验.取得了如下成果:(1)在选定的36个地区未来2.时单点预测上,基于本文的Att-LSTM模型的TEC预测性能明显优于其他对比模型;(2.讨论了纬度对Att-LSTM预测未来2.时TEC值时性能的影响,发现在北纬0°到60°之间,Att-LSTM预测性能随着纬度的升高而略有降低,在北纬62.5°~87.5°之间,模型预测性能出现扰动,预测效果略差;(3)讨论了磁暴期和磁静期模型的预测性能,发现无论是磁暴期还是磁静期,本文模型预测性能均较好;(4)还讨论了对未来多时点预测效果,实验结果表明,本文所提出的模型对未来2.4个小时的预测拟合度R-Square均超过0.95,预测结果比较可靠,对未来6、8、10个小时预测拟合度最高为0.7934,预测拟合度R-Square下降迅速,预测结果不可靠.

关键词：注意力机制长短期记忆神经网络电离层总电子含量

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