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利用印度气象局（India Meteorological Department,IMD）、国际气候管理最佳路径档案库（International Best Track Archive for Climate Stewardship,IBTrACS）提供的1982—2020年阿拉伯海热带气旋路径资料,美国国家环境预报中心（National Centers for Environmental Prediction,NCEP）再分析资料,对近39 a阿拉伯海热带气旋源地和路径特征、活跃区域、频数及气旋累积能量（accumulated cyclone energy,ACE）指数的季节特征和年际变化特征进行分析,并结合环境因素,说明其物理成因。结果表明：阿拉伯海热带气旋多发于10°~25°N,65°~75°E海域,5—6月、9—12月发生频数较高且强度较强,1—4月、7—8月发生频数较低且气旋近中心最大风速均小于35 kn;频数的季节变化主要受控于垂直风切变要素;阿拉伯海热带气旋发生频数和ACE近年有上升趋势,年际变化主要受控于海面温度（sea surface temperature,SST）和850 hPa相对湿度要素。 相似文献
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通过对印度洋夏季气压场分布与南半球过赤道气流对西南季风贡献分析,讨论了印度洋阿拉伯海西部附近海域,风、浪场变化特征和该海域航线的选择。 相似文献
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利用全球海洋Argo网格数据集、SODA月平均海洋数据集和CCMP风场数据,通过EOF分析,揭示了阿拉伯海5、50、100、200 m层海温全年2次增温、2次降温的双峰变化特征.结果表明,5 m层温度变化双峰信号出现在第一模态,其方差贡献率为75.79%,该信号主要受风场、太阳辐射及风生环流影响;50 m层温度变化双峰信号出现在第三模态,其方差贡献率为11.95%,该信号主要受风生环流影响;100 m层温度变化双峰信号出现在第一模态和第三模态,其中第一模态方差贡献率为52.03%,第三模态方差贡献率为9.55%.由100 m层第一模态可知,100 m层温度变化幅度最大、变化范围最广,是由于100 m层处于海洋温度变化最为剧烈的温跃层中.100 m层海温变化主要受风应力旋度(方向:向上为正)影响,风应力旋度为负时,大气对海洋的强迫导致局地海水辐合,温跃层加深,100 m层部分海域温度升高;风应力旋度为正时,大气对海洋的抽吸导致局地海水辐散,海洋深处的冷水上升,100 m层部分海域温度降低. 相似文献
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CHEN Meixiang) ZUO Juncheng) LI Peiliang) DU Ling) and LI Lei)) Oceanography Department Ocean University of China Qingdao P. R. China ) Key Laboratory of Coastal Disaster Defence Ministry of Education Hohai University Nanjing P. R. China 《中国海洋大学学报(英文版)》2007,6(2):117-124
Based on a ship survey during January 1998, the characteristics of the flow, the thermohaline properties and the volume transport of the Arabian Sea are discussed. A strong westward flow exists between 10.5?N and 11?N, part of which turns to the south as the Somali current near the coast at about 10?N and the rest turns north. At the passage between the African continent and the So- cotra Island, the northern branch separates into two flows: the left one enters the passage and the right one flows eastward along the southern slope of the island. Off the island the flow separates once more, most of it meandering northeast and a small fraction flow- ing southeast. Volume transport calculation suggests that the tidal transport is one or two orders of magnitude smaller than the total transport in this region and it becomes more important near the coast. The average velocity of the flow in the upper layer (0-150 m) is about 20 cm s-1, with a maximum of 53 cm s-1 appearing east of the Socotra Island, and the subsurface layer (200-800 m) has an aver- age velocity of 8.6 cm s-1; the velocity becomes smaller at greater depths. The depth of the seasonal thermocline is about 100 m, above which there is a layer with well mixed temperature and dissolved oxygen. High-salinity and oxygen-rich water appears near the surface of the northern Arabian Sea; a salinity maximum and oxygen minimum at 100 m depth along 8?N testifies the subduction of surface water from the northern Arabian Sea. Waters from the Red Sea and the Persian Gulf also influence the salinity of the area. 相似文献
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通常认为海底扇的发育出现于低海面时期。在陆生地体中 ,相对海平面的降低导致从河流和陆架向深海盆搬运的沉积物增加 ,从而促使扇体发育。在一般情况下 ,这是由于三角洲向陆架边缘迁移和陆坡不稳定的增强 ,在陆架上形成下切水道和峡谷 ,从而使河流梯度增加所致。在相对海平面上升时期 ,沉积物圈闭在近岸带 ,阻止了沉积物向深海搬运。然而 ,在海平面上升和高海位时期 ,在陆架边缘的三角洲前缘或与河谷相连的陆架峡谷体系中也发现了浊流沉积作用。在这些研究中 ,海平面信号没有揭示气候和构造背景的影响。这里我们研究了在地貌上存在差异的两… 相似文献
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晚中新世以来亚洲季风阶段性演化的海陆记录 总被引：4，自引：0，他引：4
本文在综合对比晚新生代以来中国黄土高原黄土一红粘土沉积、西北太平洋粉尘沉积、南海有孔虫、阿拉伯海有孔虫记录的基础上，探讨了大约8Ma以来亚洲季风的阶段性演化历史。结果发现，黄土高原粉尘沉积在8Ma前后大规模出现，在3．5Ma前后大幅增加；印度季风在8Ma前后形成(或显著加强)；南海ODP1146站位浮游有孔虫Neoglcboquadrina丰度也有两次明显增加，表明海水表面温度不断降低和海洋生产力的增加，指示东亚冬季风作用增强。北太平洋()DP885／886钻孔风成粉尘通量也有增加，指示亚洲内陆进一步的干旱化和冬季风作用的增强。印度洋沉积通量在11Ma前后开始增加。在9～8Ma时出现峰值，表明喜马拉雅山和青藏高原南部逐渐隆起。当隆起达到足够高度时，导致亚洲内陆干旱气候带扩大，同时提供大量粉尘并向东传输到中国北方和北太平洋地区。青藏高原北缘山前盆地的沉积记录显示，在3．6Ma时，高原北部的进一步快速隆升过程可能影响到整个高原，从而导致亚洲内陆更加干旱化，东亚季风增强，粉尘沉积加快，南海及印度洋陆源沉积作用加剧。 相似文献
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利用印度气象局（India Meteorological Department,IMD）、国际气候管理最佳路径档案库（International Best Track Archive for Climate Stewardship,IBTrACS）提供的1982—2020年阿拉伯海热带气旋路径资料,美国国家环境预报中心（National Centers for Environmental Prediction,NCEP）再分析资料,对近39 a阿拉伯海热带气旋源地和路径特征、活跃区域、频数及气旋累积能量（accumulated cyclone energy,ACE）指数的季节特征和年际变化特征进行分析,并结合环境因素,说明其物理成因。结果表明：阿拉伯海热带气旋多发于10°~25°N,65°~75°E海域,5—6月、9—12月发生频数较高且强度较强,1—4月、7—8月发生频数较低且气旋近中心最大风速均小于35 kn;频数的季节变化主要受控于垂直风切变要素;阿拉伯海热带气旋发生频数和ACE近年有上升趋势,年际变化主要受控于海面温度（sea surface temperature,SST）和850 hPa相对湿度要素。 相似文献
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ZHOU Libo ZHU Jinhuan ZOU Han MA Shupo LI Peng ZHANG Yu HUO Cuiping 《Acta Meteorologica Sinica》2013,27(6):819-831
In this study, by using the ECMWF ERA-Interim reanalysis data from 1979 to 2010, the spatial distribution and transport of total atmospheric moisture over the Tibetan Plateau（TP） are analyzed, together with the associated impacts of the South Asian summer monsoon（SASM）. Acting as a moisture sink in summer, the TP has a net moisture flux of 2.59× 107kg s 1during 1979–2010, with moisture supplies mainly from the southern boundary along the latitude belts over the Bay of Bengal and the Arabian Sea. The total atmospheric moisture over the TP exhibits significant diferences in both spatial distribution and transport between the monsoon active and break periods and between strong and weak monsoon years. Large positive（negative） moisture anomalies occur over the southwest edge of the TP and the Arabian Sea, mainly due to transport of easterly（westerly） anomalies during the monsoon active（break） period. For the whole TP region, the total moisture supply is more strengthened than the climatological mean during the monsoon active period, which is mainly contributed by the transport of moisture from the south edge of the TP. During the monsoon break period, however, the total moisture supply to the TP is slightly weakened. In addition, the TP moisture sink is also strengthened（weakened） in the strong（weak） monsoon years, mainly attributed by the moisture transport in the west-east directions. Our results suggest that the SASM has exerted great impacts on the total atmospheric moisture and its transport over the TP through adjusting the moisture spatial distribution. 相似文献