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CMIP 6 models simulation of the connection between North/South Pacific Meridional Mode and ENSO
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作者 Yunlong LU Junqiao FENG Dunxin HU 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2024年第2期439-453,共15页
The subtropical North and South Pacific Meridional Modes(NPMM and SPMM)are well known precursors of El Niño-Southern Oscillation(ENSO).However,relationship between them is not constant.In the early 1980,the relat... The subtropical North and South Pacific Meridional Modes(NPMM and SPMM)are well known precursors of El Niño-Southern Oscillation(ENSO).However,relationship between them is not constant.In the early 1980,the relationship experienced an interdecadal transition.Changes in this connection can be attributed mainly to the phase change of the Pacific decadal oscillation(PDO).During the positive phase of PDO,a shallower thermocline in the central Pacific is responsible for the stronger trade wind charging(TWC)mechanism,which leads to a stronger equatorial subsurface temperature evolution.This dynamic process strengthens the connection between NPMM and ENSO.Associated with the negative phase of PDO,a shallower thermocline over southeastern Pacific allows an enhanced wind-evaporation-SST(WES)feedback,strengthening the connection between SPMM and ENSO.Using 35 Coupled Model Intercomparison Project Phase 6(CMIP6)models,we examined the NPMM/SPMM performance and its connection with ENSO in the historical runs.The great majority of CMIP6 models can reproduce the pattern of NPMM and SPMM well,but they reveal discrepant ENSO and NPMM/SPMM relationship.The intermodal uncertainty for the connection of NPMM-ENSO is due to different TWC mechanism.A stronger TWC mechanism will enhance NPMM forcing.For SPMM,few models can simulate a good relationship with ENSO.The intermodel spread in the relationship of SPMM and ENSO owing to SST bias in the southeastern Pacific,as WES feedback is stronger when the southeastern Pacific is warmer. 展开更多
关键词 north and South pacific meridional modes(npmm and SPMM) El Niño-Southern Oscillation(ENSO) pacific decadal oscillation(PDO) Coupled model Intercomparison Project Phase 6(CMIP6)
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Response of Mode Water and Subtropical Countercurrent to Greenhouse Gas and Aerosol Forcing in the North Pacific 被引量:3
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作者 WANG Liyi LIU Qinyu +1 位作者 XU Lixiao XIE Shang-Ping 《Journal of Ocean University of China》 SCIE CAS 2013年第2期222-229,共8页
The response of the North Pacific Subtropical Mode Water and Subtropical Countercurrent (STCC) to changes in greenhouse gas (GHG) and aerosol is investigated based on the 20th-century historical and single-forcing sim... The response of the North Pacific Subtropical Mode Water and Subtropical Countercurrent (STCC) to changes in greenhouse gas (GHG) and aerosol is investigated based on the 20th-century historical and single-forcing simulations with the Geo-physical Fluid Dynamics Laboratory Climate Model version 3 (GFDL CM3). The aerosol effect causes sea surface temperature (SST) to decrease in the mid-latitude North Pacific, especially in the Kuroshio Extension region, during the past five decades (1950-2005), and this cooling effect exceeds the warming effect by the GHG increase. The STCC response to the GHG and aerosol forcing are opposite. In the GHG (aerosol) forcing run, the STCC decelerates (accelerates) due to the decreased (increased) mode waters in the North Pacific, resulting from a weaker (stronger) front in the mixed layer depth and decreased (increased) subduction in the mode water formation region. The aerosol effect on the SST, mode waters and STCC more than offsets the GHG effect. The response of SST in a zonal band around 40?N and the STCC to the combined forcing in the historical simulation is similar to the response to the aerosol forcing. 展开更多
关键词 north pacific subtropical Countercurrent mode water greenhouse gas AEROSOL
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Variability of subduction rates of the subtropical North Pacific mode waters 被引量:3
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作者 胡海波 刘秦玉 +1 位作者 张媛 刘伟 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2011年第5期1131-1141,共11页
The climatology subduction rate for the entire Pacific is known, but the mechanism of interannual to decadal variation remains unclear. In this study, we calculated the annual subduction rates of three types of North ... The climatology subduction rate for the entire Pacific is known, but the mechanism of interannual to decadal variation remains unclear. In this study, we calculated the annual subduction rates of three types of North Pacific subtropical mode waters using a general circulation model (LICOM1.0) for the period of 1958-2001. The model experiments focused on interannual variations of ocean dynamical processes under daily wind forcings and seasonal heat fluxes. The mode water formation region was defined by a potential vorticity minimum at outcrop locations. The model results show that two subduction rate maxima (>100 m/a) were located in the Subtropical Mode Water (STMW) and the Central Mode Water (CMW) formation regions. These regions are consistent with a climatologically calculated value. The subduction rate in the Eastern Subtropical Mode Water (ESTMW) formation region was smaller at about 75 m/a. The subduction rate shows clear interannual and decadal variations associated with oceanic dynamic variabilities. The average subduction rate of the STMW was much smaller during the period of 1981-1990 compared with other periods, while that of the CMW had a negative anomaly before 1975 and a positive anomaly after 1978. The variability agreed with Ekman and geostrophic advections and mixed layer depths. The interannual variability of the subduction rate for the ESTMW was smallest during 1970-1990, as a result of a weak wind stress curl. This paper explores how interannual signals from the atmosphere are stored in different parts of the ocean, and thus may contribute to a better understanding of feedback mechanisms for the Pacific Decadal Oscillation (PDO) event. 展开更多
关键词 subduction rate north pacific subtropical mode water ocean modeling
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Recent Advances in Studies on Formation Mechanism of Subtropical Mode Water and Its Climate Features in North Pacific 被引量:3
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作者 LIU Qinyu PAN Aijun 《Journal of Ocean University of Qingdao》 2002年第1期1-7,共7页
Mode Water’, as a product of air-sea interaction, influences the thermal structure and circulation pattern in upper layer ocean and consequently affects the variations of climate. In this paper the recent research re... Mode Water’, as a product of air-sea interaction, influences the thermal structure and circulation pattern in upper layer ocean and consequently affects the variations of climate. In this paper the recent research results about the subtropi-cal Mode Water in the North Pacific are overiewed. A detailed description of the three kinds of Mode Water in the subtropical North Pacific and some comparisons of their similarities and differences are introduced. Some science problems that need further exploration have been raised. 展开更多
关键词 subtropical mode Water north pacific mixed layer SUBDUCTION
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Subtropical Mode Water in the Northwestern Pacific 被引量:3
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作者 PAN Aijun, LIU QinyuPhysical Oceanography Lab. & Ocean-Atmosphere Interaction and Climate Lab., Ocean University of China, Qingdao 266003, P.R.China 《Journal of Ocean University of Qingdao》 2003年第2期134-140,共7页
Based on the in situ XBT and other data sets, by analyzing the seasonal cycle of the mixed layer depth (MLD) and using the conservative potential vorticity (PV) as a tool, a clear description of the formation process ... Based on the in situ XBT and other data sets, by analyzing the seasonal cycle of the mixed layer depth (MLD) and using the conservative potential vorticity (PV) as a tool, a clear description of the formation process of the North Pacific Subtropical Mode Water (NPSTMW) is presented for explaining the well known 'Stommel Demon'. The forming of NPSTMW reflects well the ventilation process of the isotherms of the permanent thermocline. The formation process can be divided into the 'ventilation' phase and the 'formation' phase. In the first phase (October-March), with large heat losses at the sea surface from October, the mixed layer deepens and correspondingly, the water mass with low PV emerges and sinks. After continual cooling from October to March, the mixed layer reaches its maximum value ( >300 m) in March. Then, in the second phase (April-June), the mixed layer shoals rapidly from April, a large part of the low PV water mass is sheltered from further air-sea interaction by the emerging seasonal thermocline, and thus forms new NPSTMW. Further analysis indicates that the formation region of warm NPSTMW (17-18℃) is limited between 140°-150°E, while the relatively cold NPSTMW (16-17℃) originates in a wider longitude range (140°-170°E).Climate features of NPSTMW are presented with the use of climatological Levitus (1994 a, b) dataset. It is shown that NPSTMW lies in the region of (130°-170°E, 22°-34°N) with core temperature ranging from about 16-19℃ and potential density around 25-25.8σθ NPSTMW has a three-dimensional structure lying below the seasonal thermocline (about 100 m deep) and reaches almost to 350m depths. 展开更多
关键词 north pacific subtropical mode Water (NPSTMW) ventilation process mixed layer depth (MLD) potential vorticity (PV)
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Contribution of Mesoscale Eddies to the Subduction and Transport of North Pacific Eastern Subtropical Mode Water
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作者 YANG Zhitong LUO Yiyong 《Journal of Ocean University of China》 SCIE CAS CSCD 2020年第1期36-46,共11页
This study investigates the contribution of mesoscale eddies to the subduction and transport of North Pacific Eastern Subtropical Mode Water(ESTMW)using the high-frequency output of an eddy-resolved ocean model spanni... This study investigates the contribution of mesoscale eddies to the subduction and transport of North Pacific Eastern Subtropical Mode Water(ESTMW)using the high-frequency output of an eddy-resolved ocean model spanning the period 1994–2010.Results show that the subduction induced by mesoscale eddies accounts for about 31%of the total subduction of ESTMW formation.The volume of ESTMW trapped by anticyclonic eddies is slightly larger than that trapped by cyclonic eddies.The ESTMW trapped by all eddies in May reaches up to about 2.8×1013m3,which is approximately 16%of the total ESTMW volume.The eddy-trapped ESTMW moves primarily westward,with its meridional integration at 18°–30°N reaching about 0.17Sv,which is approximately 18%of the total zonal ESTMW transport in this direction,at 140°W.This study highlights the important role of eddies in carrying ESTMW westward over the northeastern Pacific Ocean. 展开更多
关键词 mesoscale eddies SUBDUCTION TRANSPORT north pacific Eastern subtropical mode Water
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Storage and redistribution of anthropogenic CO_(2) in the western North Pacific:The role of subtropical mode water transportation
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作者 Cheng-long Li Lei Han +4 位作者 Wei-dong Zhai Di Qi Xu-chen Wang Hong-mei Lin Li-wen Zheng 《Fundamental Research》 CAS CSCD 2024年第1期103-112,共10页
Oceanic uptake and storage of anthropogenic CO_(2)(CANT)are regulated by ocean circulation and ventilation.To decipher the storage and redistribution of CANT in the western North Pacific,where a major CANT sink develo... Oceanic uptake and storage of anthropogenic CO_(2)(CANT)are regulated by ocean circulation and ventilation.To decipher the storage and redistribution of CANT in the western North Pacific,where a major CANT sink develops,we investigated the water column carbonate system,dissolved inorganic radiocarbon and ancillary parameters in May and August 2018,spanning the Kuroshio Extension(KE,35-39°N),Kuroshio Recirculation(KR,27-35°N)and subtropical(21-27°N)zones.Water column CANT inventories were estimated to be 40.5±1.1 mol m^(-2) in the KR zone and 37.2±0.9 mol m^(-2) in the subtropical zone.In comparison with historical data obtained in 2005,relatively high rates of increase of the CANT inventory of 1.05±0.20 and 1.03±0.12 mol m^(-2) yr^(-1) in the recent decade were obtained in the KR and subtropical zones,respectively.Our water-mass-based analyses suggest that formation and transport of subtropical mode water dominate the deep penetration,storage,and redistribution of CANT in those two regions.In the KE zone,however,both the water column CANT inventory and the decadal CANT accumulation rate were small and uncertain owing to the dynamic hydrology,where the naturally uplifting isopycnal surfaces make CANT penetration relatively shallow.The findings of this study improve the understanding of the spatiotemporal variations of CANT distribution,storage,and transport in the western North Pacific. 展开更多
关键词 Oceanic CO_(2)uptake Anthropogenic CO_(2)storage subtropical mode water Kuroshio extension Kuroshio recirculation Western north pacific
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Unprecedented East Asian warming in spring 2018 linked to the North Atlantic tripole SST mode
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作者 DENG Kaiqiang YANG Song +2 位作者 LIN Ailan LI Chunhui HU Chundi 《Atmospheric and Oceanic Science Letters》 CSCD 2019年第4期246-253,共8页
An unusually warm East Asia in spring 2018,when exceptionally high surface air temperatures were recorded in large areas of Asia,such as northern China,southern China,and Japan,was investigated based on the ERA-Interi... An unusually warm East Asia in spring 2018,when exceptionally high surface air temperatures were recorded in large areas of Asia,such as northern China,southern China,and Japan,was investigated based on the ERA-Interim reanalysis.The East Asian warming anomalies were primarily attributed to a tripole mode of North Atlantic SST anomalies,which could have triggered anomalous Rossby wave trains over the North Atlantic and Eurasia through modulating the North Atlantic baroclinic instability.Atlantic-forced Rossby waves tend to propagate eastward and induce anomalously high pressure and anticyclonic activity over East Asia,leading to a northward displacement of the Pacific subtropical high.As a result,descending motion,reduced precipitation,and increased surface solar radiation due to less cloud cover appear over East Asia,accompanied by remarkably warm advection from the ocean to southern China,northern China,and Japan.The transportation of anomalously warm advection and the feedbacks between soil moisture and surface temperature were both favorable for the recordbreaking warmth in East Asia during spring 2018.The seasonal‘memory’of the North Atlantic tripole SST mode from the previous winter to the following spring may provide useful implications for the seasonal prediction of East Asian weather and climate. 展开更多
关键词 East Asian climate north Atlantic tripole SST mode TELECONNECTION pacific subtropical high
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Tropical cyclone genesis over the western north Pacific in La Ni?a decay summers: Comparison between 2018 and 2021
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作者 Yunyun LIU Zhensong GONG 《Science China Earth Sciences》 SCIE EI CAS CSCD 2024年第10期3098-3109,共12页
As the primary interannual signal of variability in the tropical ocean-atmosphere interaction, the El Ni?o-Southern Oscillation has a considerable impact on tropical cyclone(TC) activity over the western North Pacific... As the primary interannual signal of variability in the tropical ocean-atmosphere interaction, the El Ni?o-Southern Oscillation has a considerable impact on tropical cyclone(TC) activity over the western North Pacific(WNP). Both 2018 and2021 were La Ni?a decay years, but TC activity over the WNP during the two summers(June–August) showed notable differences. In 2018, summer TC activity was unusually high with a total of 18 TCs, and the region of TC genesis was mainly in the central and eastern WNP. In contrast, only 9 TCs were generated in summer 2021, and the region of TC genesis was primarily in the western WNP. By comparing the characteristics of the large-scale environmental conditions over the regions of TC genesis, the thermal factors of the tropical oceans, and the activity of the Madden-Julian Oscillation(MJO), this study revealed the possible causes for the marked differences in TC genesis over the WNP during the two summers, which both had a similar background of La Ni?a decay. The Indian Ocean Basin Mode(IOBM) transitioned of a cold anomaly in the winter of 2017/2018and persisted until summer 2018. At the same time, the Pacific Meridional Mode(PMM) maintained a positive phase, leading to eastward and northward displacement of the Western Pacific Subtropical High in summer, and eastward extension of the tropical monsoon trough, which presented conditions conducive to TC genesis over the Northwest Pacific. Moreover, the days when the MJO stagnated in phases 5 and 6 in the summer of 2018 increased by approximately 150% relative to climatological state,providing dynamic conditions favorable for TC formation. In 2021, the IOBM quickly turned to a warm anomaly in March and persisted until summer, whereas the PMM became a negative phase in January and remained so until summer. At the same time,the MJO stagnated in phases 2 and 3 for up to 47 days, with the center of convection located over the western Maritime Continent, producing conditions unconducive to TC genesis over the Northwest Pacific. Thus, despite being under a similar background of La Ni?a decaying year, the distinct evolutions of the IOBM, PMM, and MJO in spring and summer of 2018 and2021 were the main causes of the notable differences in TC activity over the WNP during these two summers, and the anomalies in IOBM and MJO contributed more significantly than those of the PMM. 展开更多
关键词 Tropical cyclone La Nina events Indian Ocean Basin mode pacific meridional mode Madden-Julian Oscillation Western pacific subtropical High Monsoon trough
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Interannual Meridional Displacement of the East Asian Upper-tropospheric Jet Stream in Summer 被引量:83
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作者 林中达 陆日宇 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2005年第2期199-211,共13页
On the interannual timescale, the meridional displacement of the East Asian upper-tropospheric jet stream (EAJS) is significantly associated with the rainfall anomalies in East Asia in summer. In this study, using the... On the interannual timescale, the meridional displacement of the East Asian upper-tropospheric jet stream (EAJS) is significantly associated with the rainfall anomalies in East Asia in summer. In this study, using the data from the National Centers for Environmental Prediction-Department of Energy (NCEP/DOE) reanalysis-2 from 1979 to 2002, the authors investigate the interannual variations of the EAJS's meridional displacement in summer and their associations with the variations of the South Asian high (SAH) and the western North Pacific subtropical high (WNPSH), which are dominant circulation features in the upper and lower troposhere, respectively. The result from an EOF analysis shows that the meridional displacement is the most remarkable feature of the interannual variations of the EAJS in each month of summer and in summer as a whole. A composite analysis indicates that the summer (June-July-August, JJA) EAJS index, which is intended to depict the interannual meridional displacement of the EAJS, is not appropriate because the anomalies of the zonal wind at 200 hPa (U200) in July and August only, rather than in June, significantly contribute to the summer EAJS index. Thus, the index for each month in summer is defined according to the location of the EAJS core in each month. Composite analyses based on the monthly indexes show that corresponding to the monthly equatorward displacement of the EAJS, the South Asian high (SAH) extends southeastward clearly in July and August, and the western North Pacific subtropical high (WNPSH) withdraws southward in June and August. 展开更多
关键词 East Asian jet stream western north pacific subtropical high South Asian high interannual variations meridional displacement
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Relationship between real meridional volume transport and Sverdrup transport in the North Subtropical Pacific 被引量:1
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作者 JIANG Hua WANG Hui +1 位作者 ZHU Jiang TAN Benkui 《Chinese Science Bulletin》 SCIE EI CAS 2006年第14期1757-1760,共4页
The oceanic meridional volume trans-port (MVT) in the North Subtropical Pacific is calcu-lated directly from an observed velocity field (realMVT) and indirectly from wind stress based on Sver-drup balance, respectivel... The oceanic meridional volume trans-port (MVT) in the North Subtropical Pacific is calcu-lated directly from an observed velocity field (realMVT) and indirectly from wind stress based on Sver-drup balance, respectively. It is confirmed that theSverdrup MVT is a good approximation to the realMVT for the North Subtropical Pacific except in thewestern boundary region, where the difference isexpected because of frictional and nonlinear effects.The time evolution of the MVT derived from a revisedSverdrup balance, in which a time delay due to thepropagation of the first baroclinic Rossby wave isconsidered, is well correlated with that of the realMVT on decadal time scale, especially near thewestern boundary region. It is suggested that theSverdrup balance can be used to study not only themean climatology of the oceanic circulation, but alsothe time-dependent oceanic circulation of the NorthSubtropical Pacific when the Rossby wave propaga-tion is taken into account. 展开更多
关键词 斯维尔德鲁普运输 时延 MVT 亚热带 太平洋
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北太平洋副热带海区的两支东向逆流 被引量:5
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作者 李薇 刘海龙 刘秦玉 《大气科学》 CSCD 北大核心 2003年第5期811-820,共10页
分析SODA同化资料 ( 1 95 0~ 1 999年 )所描述的北太平洋副热带海区表层—次表层的东向逆流的空间分布和季节变化特征。从气候平均场看 ,北太平洋副热带的东向流主要包括东、西两部分 ,其中 ,太平洋中部夏威夷岛西侧的东支逆流位置偏... 分析SODA同化资料 ( 1 95 0~ 1 999年 )所描述的北太平洋副热带海区表层—次表层的东向逆流的空间分布和季节变化特征。从气候平均场看 ,北太平洋副热带的东向流主要包括东、西两部分 ,其中 ,太平洋中部夏威夷岛西侧的东支逆流位置偏南 ,强度夏季最大 ,春季最弱。海表风应力的旋度异常产生的Ekman抽吸是东支逆流形成的主要原因。位于西太平洋的西支逆流位置偏北 ,春季—夏季强度较大。 展开更多
关键词 北太平洋 副热带海区 逆流 副热带模态水 气候平均场
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北太平洋副热带模态水形成区混合层热动力过程诊断分析 被引量:5
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作者 潘爱军 万小芳 刘秦玉 《热带海洋学报》 CAS CSCD 北大核心 2011年第5期8-18,共11页
利用NCEP海洋数据和COADS海气通量资料,通过诊断分析,揭示了海表热力强迫、垂直夹卷、埃克曼平流和地转平流效应在北太平洋副热带模态水形成过程中的贡献。研究表明,在北太平洋副热带3个模态水形成海域冬季混合层降温过程中,海表热力强... 利用NCEP海洋数据和COADS海气通量资料,通过诊断分析,揭示了海表热力强迫、垂直夹卷、埃克曼平流和地转平流效应在北太平洋副热带模态水形成过程中的贡献。研究表明,在北太平洋副热带3个模态水形成海域冬季混合层降温过程中,海表热力强迫和垂直夹卷效应是主导因素,二者的相对贡献分别约为67%和19%(西部模态水)、53%和21%(中部模态水)、65%和30%(东部模态水);并且在东部模态水形成海域,埃克曼平流和地转平流皆是暖平流效应,而在西部和中部模态水形成海域,仅有地转平流是暖平流效应。进一步的分析表明,海洋平流(地转平流、埃克曼平流)对北太平洋副热带模态水形成海域秋、冬季混合层温度的年际、年代际异常有显著影响,在西部模态水形成海域,海表热力强迫(62%)和地转平流(32%)是导致混合层温度年际、年代际变化的主要因子;在中部模态水形成海域,混合层温度的年际、年代际变化是埃克曼平流(32%)、地转平流(30%)和海表热力强迫(25%)共同作用的结果;相对而言,东部模态水形成海域混合层温度的年际、年代际异常主要受海表热力强迫(67%)控制。 展开更多
关键词 北太平洋 副热带模态水 混合层 海表热力强迫 海洋平流 垂直夹卷
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南半球环状模对中国气候的影响研究进展 被引量:3
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作者 马浩 李正泉 张力 《高原气象》 CSCD 北大核心 2016年第6期1595-1608,共14页
南半球环状模是南半球大气环流年际变异的主导模态。按照逻辑脉络梳理了半个多世纪以来南半球环状模对中国气候影响的研究进展。中国科学家很早就注意到南北半球之间存在相互作用,南半球环流能够通过越赤道气流调控东亚夏季风、进一步... 南半球环状模是南半球大气环流年际变异的主导模态。按照逻辑脉络梳理了半个多世纪以来南半球环状模对中国气候影响的研究进展。中国科学家很早就注意到南北半球之间存在相互作用,南半球环流能够通过越赤道气流调控东亚夏季风、进一步影响到中国气候。近年来,对南半球环状模遥相关效应的研究愈加深入,已有工作侧重于从太平洋通道和印度洋通道两个角度剖析环状模对中国气候的影响。环状模变异能够引发太平洋大气经圈环流调整、激发经向遥相关波列,从而引起西太平洋暖池和西太平洋副热带高压异常,最终导致中国气候变异,从而构建了太平洋路径;另一方面,环状模异常也能够借助"海洋桥"传播到热带印度洋和南海地区、再通过局地海洋-大气相互作用调控中国气候,从而构建了印度洋路径。两大路径之间存在相互调制。除此之外,南半球环状模对中国区域气候也有显著的影响。在总结前人研究的基础上,提出了今后值得深入探讨的几个问题,以期推动南半球环状模遥相关效应研究不断走向深入。 展开更多
关键词 南半球环状模 东亚夏季风 西太平洋副热带高压 经圈环流调整 经向遥相关波列 海洋桥
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副热带太平洋海气变异对ENSO影响的研究进展和展望 被引量:1
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作者 冯俊乔 鲁云龙 +3 位作者 官聪 袁欣 惠玉超 武杰 《海洋科学》 CAS 北大核心 2020年第8期1-7,共7页
El Niño–Southern Oscillation(ENSO)是热带太平洋海气作用最强的年际信号,其变化会引起全球气候异常,对东亚季风具有重要影响。2000年后中部型El Niño频繁发生,掀起了ENSO多样性研究热潮;El Niño的复杂性也对ENSO理论... El Niño–Southern Oscillation(ENSO)是热带太平洋海气作用最强的年际信号,其变化会引起全球气候异常,对东亚季风具有重要影响。2000年后中部型El Niño频繁发生,掀起了ENSO多样性研究热潮;El Niño的复杂性也对ENSO理论研究和预测提出了新的挑战。为进一步理解并深入研究ENSO物理机制,本文总结了近年来对两类ENSO的最新认识;特别对副热带太平洋通过海气界面“大气桥”和太平洋副热带-热带经向环流圈的内部经向翻转环流这一“海洋通道”与热带太平洋建立联系的相关成果进行了阐述,并对存在的关键问题进行了展望。 展开更多
关键词 太平洋副热带-热带经向翻转环流 副热带南太平洋经向模 副热带北太平洋经向模 ENSO
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有关副热带太平洋对ENSO影响研究的综述 被引量:6
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作者 张人禾 闵庆烨 苏京志 《海洋气象学报》 2017年第1期1-9,共9页
ENSO(El Nio-Southern Oscillation)的发生发展既受到来自热带西太平洋纬向海气过程的影响,也受到来自副热带太平洋经向海气过程的影响。本文概述了副热带太平洋海气异常影响ENSO研究方面的科学背景及研究进展,综述了前人提出的副热... ENSO(El Nio-Southern Oscillation)的发生发展既受到来自热带西太平洋纬向海气过程的影响,也受到来自副热带太平洋经向海气过程的影响。本文概述了副热带太平洋海气异常影响ENSO研究方面的科学背景及研究进展,综述了前人提出的副热带太平洋大气海洋异常通过经向风应力以及北太平洋/南太平洋经向模态,影响ENSO发展演变的途径及相关物理机制,总结了近些年观测资料分析及数值模拟研究工作所提出的新观点,并讨论了相关研究中的学术分歧及有待进一步研究的问题。 展开更多
关键词 ENSO 经向风 北太平洋经向模态 南太平洋经向模态
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2015/2016年超强厄尔尼诺事件基本特征及生成和消亡机制 被引量:5
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作者 郑依玲 陈泽生 +1 位作者 王海 杜岩 《热带海洋学报》 CAS CSCD 北大核心 2019年第4期10-19,共10页
全球变暖背景下,2015/2016年超强厄尔尼诺(El Nino)事件倍受关注,此次事件是中部型和东部型El Nino的混合。研究发现,西风爆发和北太平洋经向模态对触发此次事件均有所贡献。通过对比2015/2016年、1997/1998年与中部型事件可知,2015/201... 全球变暖背景下,2015/2016年超强厄尔尼诺(El Nino)事件倍受关注,此次事件是中部型和东部型El Nino的混合。研究发现,西风爆发和北太平洋经向模态对触发此次事件均有所贡献。通过对比2015/2016年、1997/1998年与中部型事件可知,2015/2016年事件在暖背景中产生,其发展形态与中部型事件较为相似,后期海表面温度异常迅速衰退主要与赤道东太平洋海域持续的东风异常以及纬向平流较弱有关。较之1997/1998年事件,2015/2016年事件的海洋动力调整较弱,表现为较弱的温跃层反馈和海洋波动,纬向平流反馈的贡献大于温跃层反馈,大气强迫影响显著,中部海域相关要素异常值较大。在2015/2016年事件期间,赤道海域以及近赤道海域海洋上层热含量的变化基本呈负相关,且变化较为同步;衰退阶段热含量的流失主要集中在5°S—5°N海域,向两极的热输送明显。 展开更多
关键词 El NINO事件 西风爆发 北太平洋经向模态 温跃层 机制
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西北太平洋副热带逆流与模态水的季节变化和年际变化
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作者 葛啸 刘秦玉 王立宜 《海洋科学进展》 CAS CSCD 北大核心 2015年第3期279-287,共9页
本研究依据2004—2011年Argo观测资料的数据,对西北太平洋副热带逆流(STCC)和副热带西部模态水(STMW)的季节和年际变化进行了分析,探索了不同时间尺度上STCC强度和STMW体积变化的对应关系。研究结果再一次表明:北太平洋副热带环流... 本研究依据2004—2011年Argo观测资料的数据,对西北太平洋副热带逆流(STCC)和副热带西部模态水(STMW)的季节和年际变化进行了分析,探索了不同时间尺度上STCC强度和STMW体积变化的对应关系。研究结果再一次表明:北太平洋副热带环流中存在南、北两支向东的副热带逆流(STCC),这2支逆流分别位于18°-20°N和23°-25°N纬带,月平均流速在5-20cm·s^-1。而位于西北太平洋温跃层内的低位势涡度(PV小于2.0×10^-10 m^-1·s^-1)的STMW主要出现在140°-170°E,25°-31°N的海域,介于25.0-25.6σθ等位势密度面之间,核心位势密度为25.3σθ。日界线以西的2支STCC强度和STMW体积都存在较显著的季节变化和年际变化。2支STCC强度的季节变化相类似,在5—7月中都较强,在11月较弱,这与前人提出的STCC在春季最强略有差异。STMW的体积在4—8月较大,9月后开始减小,该现象证实了在季节变化中STMW体积的增加和减少可以影响STCC的增强和减弱。2支STCC强度的年际变化几乎没有一致性,但STMW体积和局地风应力旋度的年际变化与STCC北支强度年际变化关系更密切。 展开更多
关键词 副热带逆流 副热带模态水 北太平洋 季节变化 年际变化
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副热带南北太平洋经向模与ENSO的关系
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作者 鲁云龙 冯俊乔 +1 位作者 贾凡 王庆业 《海洋与湖沼》 CAS CSCD 北大核心 2021年第1期16-26,共11页
本文利用Hadley中心的海表面温度、海洋再分析资料ORAS4(Ocean Reanalysis System 4)的海表面高度、NCEP(National Centers for Environmental Prediction)的海气界面风场及热通量等数据,分析了1948-2018年期间副热带南、北太平洋经向模... 本文利用Hadley中心的海表面温度、海洋再分析资料ORAS4(Ocean Reanalysis System 4)的海表面高度、NCEP(National Centers for Environmental Prediction)的海气界面风场及热通量等数据,分析了1948-2018年期间副热带南、北太平洋经向模(South Pacific meridional mode,SPMM、North Pacific meridional mode,NPMM)的基本特征及其与厄尔尼诺-南方涛动(El Niño and Southern Oscillation,ENSO)的关系。结果显示,两个副热带太平洋经向模对应的海表面温度异常都呈现南北反位相的偶极子结构,并与ENSO关系密切:当Niño3.4滞后北太平洋经向模10个月时,二者达到最大正相关;Niño3.4滞后南太平洋经向模6个月时,二者达到最大正相关。换句话说,在副热带太平洋发生北太平洋经向模正位相事件(北太平洋东南暖,西北冷)1 a后或者南太平洋经向模正位相事件(南太平洋东北暖,西南冷)半年后,热带太平洋可能会发生厄尔尼诺事件。据此,利用二元线性回归方法建立了基于南太平洋经向模和北太平洋经向模预测ENSO的统计模型,得到拟合的Niño3.4和观测的Niño3.4之间的相关系数达0.57,预测效果良好。 展开更多
关键词 ENSO 南太平洋经向模 北太平洋经向模
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