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| 1 | Spatial structure of turbulent mixing of an anticyclonic mesoscale eddy in the northern South China Sea显示文摘Upper turbulent mixing in the interior and surrounding areas of an anticyclonic eddy in the northern South China Sea(SCS)was estimated from underwater glider data(May 2015)in the present study,using the Gregg-HenyeyPolzin parameterization and the Thorpe-scale method.The observations revealed a clear asymmetrical spatial pattern of turbulent mixing in the anticyclonic eddy area.Enhanced diffusivity(in the order of 10–3 m2/s)was found at the posterior edge of the anticyclonic mesoscale eddy;on the anterior side,diffusivity was one order of magnitude lower on average.This asymmetrical pattern was highly correlated with the eddy kinetic energy.Higher shear variance on the posterior side,which is conducive to the triggering of shear instability,may be the main mechanism for the elevated diffusivity.In addition,the generation and growth of sub-mesoscale motions that are fed by mesoscale eddies on their posterior side may also promote the occurrence of strong mixing in the studied region.The results of this study help improve our knowledge regarding turbulent mixing in the northern SCS. | Yongfeng Qi Chenjing Shang Huabin Mao Chunhua Qiu Changrong Liang Linghui Yu Jiancheng Yu Xiaodong Shang | 2020 | Acta Oceanologica Sinica2020，39，11： | 2 |
| 2 | SHRIMP Zircon U-Pb Dating of the Tongshi Magmatic Complex in Western Shandong and Its Geological Implications显示文摘The SHRIMP U-Pb zircon dating result of the Tongshi magmatic complex in western Shandong is presented in this paper. The Tongshi magmatic complex comprises fine-grained porphyritic diorite and syenitic porphyry. Eighteen analyses for fine-grained porphyritic diorite gave two concordia ages, in which ten analyses constitute the young age group, giving 206Pb/238U ages ranging from 167.9 Ma to 183 Ma with a weighted mean age of 175.7 ± 3.8 Ma, and the other eight yielded 207Pb/206Pb ages of 2502 Ma to 2554 Ma with a weighted mean 2518 ± 11 Ma. Two analyses for syenitic porphyry gave ages of 2485 Ma and 2512 Ma, respectively. The age of 175.7± 3.8 Ma indicates that the crystallization of the Tongshi magmatic complex occurred in the Middle Jurassic, whereas that of 2518 ± 11 Ma is interpreted as the age of inherited magmatic zircons in the Neoarchean Wutai period. | HU Huabin MAO Jingwen LIU Dunyi NIU Shuyin WANG Yanbin LI Yongfeng SHI Ruruo | 2005 | Acta Geologica Sinica(English Edition)2005，79，4： | 1 |
| 3 | Variations of mesoscale eddy SST fronts based on an automatic detection method in the northern South China Sea显示文摘SST fronts at the mesoscale eddy edge(ME fronts)were investigated from 2007–2017 in the northern South China Sea(NSCS)based on an automatic method using satellite sea level anomaly(SLA)and SST data.The relative probabilities between the number of anticyclonic/cyclonic ME fronts(AEF/CEF)and the number of anticyclones/cyclones reached 20%.The northeastern and southwestern parts of these anticyclones had more fronts than the northwestern and southeastern parts,although CEFs were nearly equally distributed in all directions.The number of ME fronts had remarkable seasonal variations,while the eddy kinetic energy(EKE)showed no seasonal variations.The total EKE at the ME fronts was three times of that within the MEs,and it was much stronger in AEFs than in CEFs.The interannual variability in the number of ME fronts and EKE had no significant correlation with the El Ni?o-Southern Oscillation(ENSO)index.Possible mechanisms of ME fronts were discussed,but the contributions of mesoscale eddies to SST fronts need to be quantified in future studies. | Chunhua Qiu Juan Ouyang Jiancheng Yu Huabin Mao Yongfeng Qi Jiaxue Wu Danyi Su | 2020 | Acta Oceanologica Sinica2020，39，11： | 1 |
| 4 | Variations in Dissolved Oxygen Induced by a Tropical Storm Within an Anticyclone in the Northern South China Sea显示文摘Tropical storms(TSs)can induce sea surface cooling,freshening,and phytoplankton blooms.The dissolved oxygen(DO)concentration response to TSs within an anticyclone is still unclear due to the rarity of in situ observations.In this study,we investi-gate the variations in DO concentration attributed to TS‘Haitang’within an anticyclonic eddy in the northern South China Sea based on Chinese underwater glider data.DO concentrations have a higher value at the edge of eddy than at the core.Influenced by TS,DO concentrations decrease remarkably in the subsurface layer in all three regions(inside,edge,and outside of the anticyclonic eddy).The mean DO concentrations decrease more at the edge of the anticyclone than those inside the anticyclone.The recovery time of DO concentration after TS is around one week at the edge of the anticyclone and is>10 days within the eddy.Our observations show that the DO concentrations decrease above the subsurface chlorophyll a maxima layer.Quantitative analysis shows that variations in DO concentration are dominated by horizontal advection and vertical advection terms in the subsurface layer. | YI Zhenhui WANG Dongxiao QIU Chunhua MAO Huabin YU Jiancheng LIAN Shumin | 2022 | Journal of Ocean University of China2022，21，5： | 0 |
| 5 | Validation of NCEP and OAFlux air-sea heat fluxes using observations from a Black Pearl wave glider显示文摘Latent and sensible heat fluxes based on observations from a Black Pearl wave glider were estimated along the main stream of the Kuroshio Current from the East China Sea to the east coast of Japan,from December 2018 to January 2019.It is found that the data obtained by the wave glider were comparable to the sea surface temperature data from the Operational Sea Surface Temperature and Sea Ice Analysis and the wind field data from WindSat.The Coupled Ocean Atmosphere Response Experiment 3.0(COARE 3.0)algorithm was used to calculate the change in air-sea turbulent heat flux along the Kuroshio.The averaged latent heat flux(LHF)and sensible heat flux(SHF)were 235 W/m^(2)and 134 W/m^(2),respectively,and the values in the Kuroshio were significant larger than those in the East China Sea.The LHF and SHF obtained from Objectively Analyzed Air-Sea Fluxes for the Global Oceans(OAFlux)were closer to those measured by the wave glider than those obtained from National Centers for Environmental Prediction(NCEP)reanalysis products.The maximum deviation occurred in the East China Sea and the recirculation zone of the Kuroshio(deviation of SHF>200 W/m^(2);deviation of LHF>400 W/m^(2)).This indicates that the NCEP and OAFlux products have large biases in areas with complex circulation.The wave glider has great potential to observe air-sea heat fluxes with a complex circulation structure. | Huabin Mao Xiujun Sun Chunhua Qiu Yusen Zhou Hong Liang Hongqiang Sang Ying Zhou Ying Chen | 2021 | Acta Oceanologica Sinica2021，40，10： | 0 |
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