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

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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 25% 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

Southern Hemisphere mean zonal wind in upper troposphere and East Asian summer monsoon circulation

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Chinese Science Bulletin 2006年第12期51卷 1508-1514页

作者： wang huijun FAN Ke Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Department of Atmospheric Science Yunnan University Kunming 650091 China

Rlationship between the Southern Hemisphere upper troposphere zonal wind variability and the East Asian summer monsoon was studied. The mean zonal wind difference in 150 hPa between 60°S and 30°S is defined as an index (ISH). The re- search reveals that ISH is negatively correlated with the East Asian summer monsoon (EASM) circulation in the interannual scale. It is also suggested that the meridional teleconnection in the zonal wind field, with the main part in Eastern Hemisphere, from mid-and- high latitudes in the Southern Hemisphere to the tropical region is responsible for the ISH-EASM link- age. The teleconnection may result in changes of the wind fields and pressure system changes causing variability of the East Asian monsoon. In addition, the anomalous teleconnection pattern in Eurasia is likely to be another mechanism. ISH and EASM circulation are found to have both simultaneous and lag correla- tions, thus, the relationship has implications for sea- sonal climate prediction over East Asia.

关键词：南半球对流层东亚季风

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

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

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

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 *** 2018,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 2019 and *** implies that the reduction of PM_(2.5)emission has resulted in a reduction of CP days(about 11 days in 2019 and 2020).The differences in atmospheric 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 2020,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

State Machine with Tracking Tree and Traffic Allocation Scheme Based on Cumulative Entropy for Satellite Network

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Chinese Journal of Electronics 2020年第1期29卷 183-189页

作者： LIN Wenliang wang huijun DENG Zhongliang wang Ke ZHOU Xiaotian The School of Electronic Engineering Beijing University of Posts and Telecommunications Science and Technology on Communication Networks Laboratory 54th Institute CETC Chinese Institute of Electronics

Satellite network is regarded as an important component of 5 th Generation(5 G). New deployment scenarios have been designed in form of satellite network fused 5 G terrestrial network. Service requests in Non terrestrial networks(NTN) are noncentralized in the time and space domain, which cause services modelling uncertain and lack of balance between latency and bandwidth. Targeted at those bottlenecks,a Satellite service model based on State machine with tracking tree(SM-SMTT) and traffic allocation scheme base on cumulative entropy is proposed. Enhanced mobile broadband service, low latency service and massive machine type communications in satellite will be modelled by SM-SMTT. Cumulative entropy is introduced as the criterion to allocate traffic. According to the lower bound from cumulative entropy, the balance of latency and bandwidth is achieved in different deployment *** simulation in OPNET, demonstrations the new scheme has promoted the performance of delay and bandwidth utilization by 37.8% and 12.0%.

关键词： Heterogeneous network Traffic congestion Channel utilization OPNET

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

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 1961-2004. 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 20-30 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