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Performance Evaluation of Three Parameterizations on Internal Tidal Mixing in the northern pacific

Journal of Ocean University of China 2023年第3期22卷 601-611页

作者： TAN Jiao MENG Jing CHEN Xu JIA Cun DU Tao YANG Xiaoxin LIU Tianyang College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Qingdao National Laboratory for Marine Science and Technology Qingdao 266100China Ocean Dynamics Laboratory Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China PLA Key Laboratory of Hydrographic Surveying and Mapping Dalian Naval AcademyDalian 116018China

The accurate assessment of the energy dissipation of internal tides(ITs)is of great importance because ITs contribute significantly to abyssal mixing.Thus,in this study,the IT-driven dissipation and diapycnal diffusion in the northern pacific are esti-mated using parameterizations proposed by St.Laurent et al.(2002),Koch-Larrouy et al.(2007),and de Lavergne et al.(2020)(hereaf-ter referred to as LSJ02,KL07,and dL20,respectively).The performances of the three parameterizations are evaluated by comparing the calculated results with fine structure observations.In particular,the dissipation estimated by LSJ02 parameterization shows a bottom-intensified characteristic,with the patterns showing good agreement with the observations near seamounts.Moreover,43%of the results calculated using the LSJ02 parameterization have errors lower than one order of magnitude in the generation sites of ITs.Meanwhile,the strongest dissipation estimated by the KL07 parameterization shifts to the thermocline,with the results showing the highest level of consistency with observations in the generation sites.The proportion of results with errors lower than one order of magnitude is 80.7%.Furthermore,the results calculated by dL20 parameterization agree well with the observations in the upper and middle layers,with the parameterization showing an accurate estimation of the remote dissipation.The percentages of the errors lower than one order of magnitude between the dL20 parameterization and observations account for 77.1%and 88.7%in the genera-tion sites and far-field regions,respectively.

关键词： internal tides mixing parameterization northern pacific

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Deep Convective Clouds over the northern pacific and Their Relationship with Oceanic Cyclones

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Advances in Atmospheric Sciences 2015年第6期32卷 821-830页

作者： YI Mingjian FU Yunfei LIU Peng ZHENG Zhixia University of Science and Technology of China Anhui Provincial Academy of Environmental Sciences State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences

Based on combined CloudSat/CALIPSO detections, the seasonal occurrence of deep convective clouds （DCCs） over the midlatitude North pacific （NP） and cyclonic activity in winter were compared. In winter, DCCs are more frequent over the central NP, from approximately 30~N to 45~N, than over other regions. The high frequencies are roughly equal to those occurring in this region in summer. Most of these DCCs have cloud tops above a 12 km altitude, and the highest top is approximately 15 km. These wintertime marine DCCs commonly occur during surface circulation conditions of low pressure, high temperature, strong meridional wind, and high relative humidity. Further, the maximum probability of DCCs, according to the high correlation coefficient, was found in the region 10^-20~ east and 5^-10~ south of the center of the cyclones. The potential relationship between DCCs and cyclones regarding their relative locations and circulation conditions was also identified by a case study. Deep clouds were generated in the warm conveyor belt by strong updrafts from baroclinic flows. The updrafts intensified when latent heat was released during the adjustment of the cyclone circulation current. This indicates that the dynamics of cyclones are the primary energy source for DCCs over the NP in winter.

关键词： CloudSat deep convective clouds marine cyclones northern pacific

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