北太平洋低纬度西边界流(NMK)的时空特征     

康霖  王凡  陈永利 《海洋预报》2011,28(3):32-39

利用高分辨率的长时间序列海洋模式资料OFES(OGCM for the Earth Simulator),对北太平洋低纬度西边界流的时空分布特征及其与.ENSO循环的联系进行了初步分析.结果表明:北太平洋低纬度西边界流具有明显的季节和年际变化特征.在季节尺度上,整个NMK系统都表现为春强秋弱,而在年际尺度上,NEC和K...  相似文献   

Long-term variabilities of thermodynamic structure of the East China Sea Cold Eddy in summer   总被引：6，自引：0，他引：6  

陈永利  胡敦欣王凡 《中国海洋湖沼学报》2004,22(3):224-230

Based on more than 30 years observed sectional temperature data since the 1960s, and compared with multi-year wind and Changjiang (Yangtze) River discharge data, spatial-temporal variations of the East China Sea Cold Eddy (ECSCE) in summer was analyzed in relationship to ocean circulation and local atmospheric circulation. Empirical Orthogonal Function (EOF) and Singular Value Decomposition (SVD) analyseswere applied to this study. The results show that: l) The ECSCE in summer possesses significant interannual variabilities, which are directly associated with oceanic and atmospheric circulation anomaly. Main fluctuations demonstrate their falling in basically with E1 Nino events (interannual) and interdecadal variability. 2) The ECSCE in summer is closely related to the variation of the Yellow Sea Warm Current (YSWC) and the Changjiang River discharge. The stronger the YSWC, the more intensive the ECSCE with its center shifting westward,and vice versa. However, a negative correlation between the Changjiang River discharge and the ECSCE strength is shown. The ECSCE was strengthened after the abrupt global climate change affected by the interdecadal variation of the YSWC. 3) SVD analysis suggested a high correlation between the variation of the ECSCE in summer and the anomalous cyclonic atmospheric circulation over the ECS. Intensification of the cyclonic wind strengthens the ECSCE, and vice versa. 4) The cyclonic atmospheric circulation has dominant influence on the interannual variation of the ECSCE, and the influence of the ocean circulation takes the second in. The ECSCE was usually stronger in E1 Nifio years affected by strong cyclonic circulation in the atmosphere. The variation in strength of the ECSCE resulted from the joint effect of both oceanic and atmospheric circulation.  相似文献   

新疆库车坳陷西段古近系高溴岩盐的发现及意义   总被引：1，自引：0，他引：1  

王凡  王永明  李晓亚  刘炎东  李波  韦钊  王健  刘星旺  王占文 《中国煤炭地质》2018,(6)

在对库车坳陷油气钻井进行岩屑观察编录及采样工作过程中,在库车坳陷西段北部KS208井深部发现有古近系古-始新统库姆格列木群(E1-2km)高溴岩盐岩屑。岩盐岩屑表面光洁干净,透明-半透明,可见解理特征;内部可见沿生长环带发育的原生包裹体及呈面状或串珠状分布的次生包裹体,偶见暗色-棕色烃类包裹体;原生包裹体均一温度介于37~75℃之间,保留有一定的古温度信息,次生包裹体均一温度介于87~129.2℃之间,体现的不同深埋条件下岩盐所处的地温条件。以上特征表明盐岩岩屑保留有岩盐沉积-演化的信息,为原生岩屑。通过对岩屑进行基本化学分析及X(射线)衍射分析,基本确定KS208井高溴层位的溴主要赋存在盐岩中,并以类质同象的形式替代了岩盐中NaCl中的Cl。KS208井古近系高溴岩盐的发现意义重大,指示了库车坳陷在古近纪盐类沉积阶段可能存在卤水的南北迁移,导致钾、溴的分异;或是岩盐在重结晶过程中发生了溴的析出与局部富集。此外,高溴岩盐的研究对于开拓我国急缺的溴资源新类型(固体溴)有重要价值。  相似文献   

基于漂流浮标观测分析日本福岛以东表层海洋物质的散播轨迹     

卢锡  胡石建  王凡  胡敦欣  刘海龙  刁新源  于仁成 《海洋与湖沼》2022,53(5):1027-1044

认识海洋中的物质如何散播对于理解海洋环境变化和人类活动污染在海洋中的扩散过程具有非常重要的意义。利用历史海表漂流浮标观测数据,对日本福岛以东海域的表层物质散播轨迹进行了拉格朗日示踪分析和观测模拟试验研究。结果发现,福岛以东海域海表浮标的散播路径主要分为东、南两支,其中速度较快的东支为主要通道,沿黑潮延伸体汇入北太平洋流,最短用时大约22个月即可到达北美西海岸;南支则沿黑潮延伸体以南的大范围南向流向西南方向运移,速度较慢且明显受涡旋活动影响,最快大约5个月即可到达吕宋海峡和中国台湾以东海域,进而进入南海和东海等中国近海海域。通过开展观测模拟试验,发现海表浮标散播的概率密度分布呈现以福岛附近海域为核心、向西南和正东方向递减扩展的形态,其中,到达中国近海的浮标主要通过吕宋海峡进入。文章详细讨论了研究结果的局限性、不足之处,以及因基于大量现场观测而具备的重要参考价值。  相似文献   

利用GPS观测资料分析2008年于田Ms7.3地震的同震位移及震后形变   总被引：3，自引：0，他引：3       下载免费PDF全文

王凡  陈为涛  王敏  沈正康  王阎昭  万永革 《地球物理学报》2011,54(9):2250-2255

2008年3月21日新疆于田发生Ms7.3级地震.本文通过处理、分析GPS数据,得到破裂断层北侧100 km附近的同震位移及震后形变信息.在观测区域GPS点监测到10 mm左右的同震位移,其中最大为南向14 mm,东向5 mm.同震位移呈现一致性的东南向运动特征,证实于田地震存在显著的左旋走滑分量.震后台站向西南方向运...  相似文献   

热带太平洋次表层海温异常年代际变率及其对中国气候异常的影响   总被引：4，自引：0，他引：4  

陈永利  赵永平  王凡  冯俊乔 《热带气象学报》2011,27(6):785-796

利用近50年月平均的SODA海洋同化资料和NCEP大气再分析资料,研究了热带太平洋次表层海温异常(SOTA)年代际变率主要分布型以及与之相关的亚洲-北太平洋-北美地区上空异常大气环流场,并揭示了类ENSO模态与中国气候异常之间的联系.得到主要结果:(1)热带太平洋SOTA年代际变率有两种类ENSO模态.第一模为类ENSO事件成熟期热带太平洋年代际SOTA状态；第二模为类ENSO过渡期热带太平洋年代际SOTA状态.二者组合构成类ENSO事件40年左右及其背景下13年左右的周期振荡.(2)类ENSO事件对亚洲-北太平洋-北美上空中高纬和副热带大气系统年代际变化具有重要影响.类El Ni(n)o成熟期间冬季,中高纬地区大气环流经向型发展,贝加尔湖高压脊加强,西太平洋副高偏强、位置偏西,蒙古高原为较强的异常反气旋环流.类El Ni(n)o衰退期(类La Ni(n)a发展期)夏季,贝加尔湖低压槽加深,乌拉尔山高压脊加强,西太平洋副高偏弱,新疆-河套地区为较强的异常反气旋环流距平.类La Ni(n)a事件时相反.(3)热带太平洋类ENSO事件通过影响中高纬和副热带大气系统,造成中国北部地区上空南风距平的年代际变化,进而导致东亚季风和中国气候异常.类El Ni(n)o事件成熟期,中国北部地区上空多异常偏北风,东亚季风弱,华北少雨,长江中、下游多雨；类El Ni(n)o衰退(类La Ni(n)a发展)期,中国北部地区上空亦为异常偏北气流,东亚季风较弱,华北少雨.中国气候异常型主要取决于类ENSO第一模态,而第二模态主要视位相异同来加强或减弱第一模态.两个类ENSO模态的共同作用导致1978年前后中国气候跃变和华北地区持续20余年的干旱.近期类ENSO模的振荡从1998年左右开始转为类La Ni(n)a模态,大致在2018年左右结束.在此期间,华北降水有望增加,长江中、下游降水可能减少.  相似文献   

ENSO cycle and climate anomaly in China   总被引：2，自引：0，他引：2  

陈永利  赵永平  冯俊乔  王凡 《中国海洋湖沼学报》2012,30(6):985-1000

The inter-annual variability of the tropical Pacific Subsurface Ocean Temperature Anomaly (SOTA) and the associated anomalous atmospheric circulation over the Asian North Pacific during the El Ni o-Southern Oscillation (ENSO) were investigated using National Centers for Environmental Prediction/ National Center for Atmospheric Research (NCEP/NCAR) atmospheric reanalysis data and simple ocean data simulation (SODA). The relationship between the ENSO and the climate of China was revealed. The main results indicated the following: 1) there are two ENSO modes acting on the subsurface tropical Pacific. The first mode is related to the mature phase of ENSO, which mainly appears during winter. The second mode is associated with a transition stage of the ENSO developing or decaying, which mainly occurs during summer; 2) during the mature phase of El Ni o, the meridionality of the atmosphere in the mid-high latitude increases, the Aleutian low and high pressure ridge over Lake Baikal strengthens, northerly winds prevail in northern China, and precipitation in northern China decreases significantly. The ridge of the Ural High strengthens during the decaying phase of El Ni o, as atmospheric circulation is sustained during winter, and the northerly wind anomaly appears in northern China during summer. Due to the ascending branch of the Walker circulation over the western Pacific, the western Pacific Subtropical High becomes weaker, and south-southeasterly winds prevail over southern China. As a result, less rainfall occurs over northern China and more rainfall over the Changjiang River basin and the southwestern and eastern region of Inner Mongolia. The flood disaster that occurred south of Changjiang River can be attributed to this. The La Ni a event causes an opposite, but weaker effect; 3) the ENSO cycle can influence climate anomalies within China via zonal and meridional heat transport. This is known as the "atmospheric-bridge", where the energy anomaly within the tropical Pacific transfers to the mid-high latitude in the northern Pacific through Hadley cells and Rossby waves, and to the western Pacific-eastern Indian Ocean through Walker circulation. This research also discusses the special air-sea boundary processes during the ENSO events in the tropical Pacific, and indicates that the influence of the subsurface water of the tropical Pacific on the atmospheric circulation may be realized through the sea surface temperature anomalies of the mixed water, which contact the atmosphere and transfer the anomalous heat and moisture to the atmosphere directly. Moreover, the reason for the heavy flood within the Changjiang River during the summer of 1998 is reviewed in this paper.  相似文献   

137°E 断面北赤道流的结构特征和年际变化     

杨青莹  王凡 《海洋科学》2013,37(12):62-67

基于日本气象厅在1967～2009 年间获得的温盐深仪(CTD)资料以及美国提供的卫星高度计资料,分析了137°E 断面北赤道流(NEC)的结构特征和年际变化, 并探讨了其年际变化的控制机制。结果表明,在137°E 断面, NEC 的平均位置位于8°～18°N, 其流核出现在10°～12°N 附近; 无论冬季还是夏季, NEC的流速距平场都具有南、北向的反位相年际振荡特征, 而这种南、北向的反位相振荡可能是由热带西北太平洋的气旋性和反气旋性异常环流所控制; NEC 内部的流速对EI Ni?o-Southern Oscillation (ENSO)的响应也存在着明显的季节特征, 其中, 在El Ni?o(La Ni?a)期间的夏季, NEC 中上部的流速增大(减小); 在El Ni?o(La Ni?a)期间的冬季, NEC 中下部的流速减小(增大), 而NEC 南、北两侧的流速则增大(减小)。  相似文献   

西太平洋深海科学观测网的建设和运行     

汪嘉宁  王凡  张林林 《海洋与湖沼》2017,48(6):1471-1479

西太平洋科学观测网是由中国科学院海洋研究所自主建成的大洋观测网络。深海数据的连续获取和实时传输对海洋与气候预报和海洋环境安全保障意义重大,世界海洋大国纷纷致力于其关键技术和系统集成的攻关。在中科院战略性先导科技专项的资助下,中科院海洋所经过统筹安排和周密部署,3年多来先后组织西太平洋综合考察航次3次,成功布放和回收深海潜标73套次,建成了由16套深海潜标组成的我国西太平洋科学观测网并实现稳定运行,获取西太平洋代表性海域连续3年的温度、盐度和洋流等数据。在2016年航次中,中国科学院又攻克了潜标数据长周期稳定实时传输的海洋观测难题,实现了深海数据的"现场直播",截至2017年9月,深海数据已成功连续实时回传260余天。以此为标志,我国的大洋科学观测网建设实现了批量化、标准化和常态化。深海观测数据的长时间连续积累和实时化传输,将提升我国深海科学研究能力,加速我国海洋与气候预报业务系统建设步伐,满足海洋强国建设、"一带一路"倡议对海洋环境安全保障的重大需求。"十三五"时期,我国正全面推进深海进入、深海探测和深海开发的深海战略,深海科学观测网建设技术和潜标数据实时传输技术对我国深海探测能力的提升意义重大。  相似文献   

Eddy generation and evolution in the North Pacific Subtropical Countercurrent (NPSC) zone     

康霖  王凡  陈永利 《中国海洋湖沼学报》2010,28(5):968-973

The seasonal generation and evolution of eddies in the region of the North Pacific Subtropical Countercurrent remain poorly understood due to the scarcity of available data. We used TOPEX/POSEIDON altimetry data from 1992 to 2007 to study the eddy field in this zone. We found that velocity shear between this region and the neighboring North Equatorial Current contributes greatly to the eddy generation. Furthermore, the eddy kinetic energy level (EKE) shows an annual cycle, maximum in April/May and minimum in December/January. Analyses of the temporal and spatial distributions of the eddy field revealed clearly that the velocity shear closely related to baroclinic instability processes. The eddy field seems to be more zonal than meridional, and the energy containing length scale shows a surprising lag of 2–3 months in comparison with the 1-D and 2-D EKE level. A similar phenomenon is observed in individual eddies in this zone. The results show that in this eddy field band, the velocity shear may drive the EKE level change so that the eddy field takes another 2–3 months to grow and interact to reach a relatively stable state. This explains the seasonal evolution of identifiable eddies.  相似文献