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| 1 | Near-surface structure and energy characteristics of the Antarctic Circumpolar Current显示文摘Historical surface drifter observations collected from the Southern Ocean are used to study the near-surface structure,variability,and energy characteristics of the Antarctic Circumpolar Current(ACC).A strong,nearly zonal ACC combined with complex fronts dominates the circulation system in the Southern Ocean.Standard variance ellipses indicate that both the Agulhas Return Current and the East Australian Warm Current are stable supplements of the near-surface ACC,and that the anticyclonic gyre formed by the Brazil warm current and the Malvinas cold current is stable throughout the year.During austral winter,the current velocity increases because of the enhanced westerly wind.Aroused by the meridional motion of the ACC,the meridional velocity shows greater instability characteristics than the zonal velocity does over the core current.Additionally,the ACC exhibits an eastward declining trend in the core current velocity from southern Africa.The characteristics of the ACC are also argued from the perspective of energy.The energy distribution suggests that the mean kinetic energy(MKE),eddy kinetic energy(EKE),and EKE are strong over the core currents of the ACC.However,in contrast,EKE/MKE suggests there is much less(more)eddy dissipation in regions with strong(weak)energy distribution.Both meridional and zonal energy variations are studied to illustrate additional details of the ACC energy characteristics.Generally,all the energy forms except EKE/MKE present west-east reducing trends,which coincide with the velocity statistics.Eddy dissipation has a much greater effect on MKE in the northern part of the Southern Ocean. | GAO Libao YU Weidong WANG Haiyuan LIU Yanliang | 2013 | Advances in Polar Science2013，24，4： | 3 |
| 2 | Structure and seasonal variability of fronts in the Southeast Indian Ocean along sections from Fremantle, Australia to Antarctic Zhongshan Station显示文摘Four sections of expendable conductivity-temperature-depth(XCTD) profiles from Fremantle, Australia to Antarctic Zhongshan Station and Moderate Resolution Imaging Spectroradiometer-Aquarius(MODIS-A) sea surface temperature(SST) products were used to study the structure and seasonal variability of Southeast Indian Ocean fronts. Water mass analysis showed that surface water masses in the Southeast Indian Ocean were less salty in March than in November. Compared with November, the subtropical front(STF) moved southward about one degree of latitude in March, whereas seasonal variability of the subantarctic front(SAF) and polar front(PF) locations was not obvious. In March, the saline front moved northward about two degrees of latitude relative to the thermal front in the upper 100 m at the SAF, which was the northern boundary of subAntarctic surface water(SASW). Analysis of climatological SST gradients from the satellite data showed that regions of enhanced sea surface temperature(SST) gradients were collocated with frontal locations identified with the XCTD data using water mass criteria. The surface expression of the PF identified by the SST gradient was further south by about one degree of latitude relative to the subsurface expression of the PF identified by the northern boundary of cold water. | YANG Wei GAO Libao LI Ruixiang LIU Changjian YAN Jinhui | 2016 | Advances in Polar Science2016，27，1： | 2 |
| 3 | Structures and defects of WO 3? x nanorods grown by in-situ heating tungsten filament显示文摘 | Huairuo Zhang Min Feng Fei Liu Libao Liu Hanyuan Chen Hongjun Gao Jianqi Li | 2004 | Chemical Physics Letters2004，，4： | 1 |
| 4 | Chinese investigation and research in Southern Ocean physical oceanography and meteorology during the Chinese Polar Programs 2011–2015显示文摘Within the context of developing a research presence in the Antarctic region, the first phase of the Chinese Polar Programs covered the period 2011–2015, which almost coincided with the 12 th Five-Year Plan(2011–2015). For the promotion of full understanding of the progress of Chinese expeditions and research in Antarctica, the observations and achievements of cruises during 2011–2015 are summarized in this paper. Four Antarctic cruises(28th–31st) were performed in the Prydz Bay and Antarctic Peninsula regions during the first phase of the Polar Programs. These cruises performed systemic collections of physical oceanographic and meteorological data to support further research on the ice–ocean–atmosphere interactions in Antarctica. Overall, 248 CTD/LADCP stations, 66 microstructure profiles, 507 XBT/XCTDs, 181 air sounding balloons, 58000 total gaseous mercury(TGM) concentrations, 452 aerosol samples, 294 atmospheric samples, 11 moorings, and 28 surface drifters were acquired or deployed during the four cruises. Using these extensive observations and other data, Chinese scientists have achieved new recognition in the fields of Southern Ocean physical oceanography and meteorology, as well as in other interdisciplinary subjects. These studies, which have been associated with scientific techniques, instrumentation, ocean circulation, water mass formation, energy transformation, and carbon uptake, have elucidated the dynamic mechanisms and potential effects of climate change in Antarctica. Finally, some observations based on experience gained during previous Chinese Antarctic Research and Expedition campaigns are summarized with advice for the improvement of future investigations in the Antarctic region. | GAO Libao WEI Zexun GUO Guijun SHI Jiuxin | 2016 | Advances in Polar Science2016，27，4： | 1 |
| 5 | Seasonal variation of mesoscale eddy intensity in the global ocean显示文摘Mesoscale eddies are a prominent oceanic phenomenon that plays an important role in oceanic mass transport and energy conversion.Characterizing by rotational speed,the eddy intensity is one of the most fundamental properties of an eddy.However,the seasonal spatiotemporal variation in eddy intensity has not been examined from a global ocean perspective.In this study,we unveil the seasonal spatiotemporal characteristics of eddy intensity in the global ocean by using the latest satellite-altimetry-derived eddy trajectory data set.The results suggest that the eddy intensity has a distinct seasonal variation,reaching a peak in spring while attaining a minimum in autumn in the Northern Hemisphere and the opposite in the Southern Hemisphere.The seasonal variation of eddy intensity is more intense in the tropical-subtropical transition zones within latitudinal bands between 15°and 30°in the western Pacific Ocean,the northwestern Atlantic Ocean,and the eastern Indian Ocean because baroclinic instability in these areas changes sharply.Further analysis found that the seasonal variation of baroclinic instability precedes the eddy intensity by a phase of 2–3 months due to the initial perturbations needing time to grow into mesoscale eddies. | Yongcan Zu Yue Fang Shuangwen Sun Libao Gao Yang Yang Guijun Guo | 2024 | Acta Oceanologica Sinica2024，43，1： | 0 |
| 6 | Vertical structure of low-level atmosphere over the southeast Indian Ocean fronts显示文摘During the 25th Chinese National Antarctic Research Expedition,GPS radiosondes were launched to detect the atmospheric vertical structure over the southeast Indian Ocean frontal region.Some low-level characteristics along the cruise are studied based on in-situ observation.The observations reveal that vertical distributions of the low-level wind field and air temperature field on both sides of the Subantarctic Front are very different.A stronger(weaker) vertical gradient is on the cold(warm) side,which demonstrates that the mid-latitude ocean-atmosphere interaction is active in the southeast Indian Ocean frontal region.A low-level jet is observed over the Subantarctic Front,with speed up to 14 m.s-1.For the Antarctic polar front,low-level wind speed near the sea surface is greater than that aloft,in contrast with the situation of the Subantarctic Front.Comparing satellite remote sensing data and widely-used reanalysis datasets with our in-situ observations,differences of varying magnitudes are found.Air temperature from Atmospheric Infrared Sounder(AIRS) data has a limited difference.The European Center for Medium Range Weather Forecasts Interim Re-Analysis(ERA Interim) dataset is much more consistent with the observations than the National Centers for Environmental Prediction/National Center for Atmospheric Research(NCEP/NCAR) Reanalysis 1 in the southeast Indian Ocean frontal region. | FENG Lin LIU Lin GAO Libao YU Weidong | 2012 | Advances in Polar Science2012，23，3： | 0 |
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