1958—2001年全球海域海表风速变化趋势     

潘静  刘铸飘  郑崇伟  陈晓斌 《气象科技》2014,42(1):104-109

基于ECMWF的ERA-40海表10m风场,对1958—2001年全球海表风速的变化趋势进行分析,主要分析了整体变化趋势、变化趋势的季节性差异、区域性差异、变化周期。结果表明:①近44年期间,全球海域海表风速整体上以0.0067m·s-1·a-1的速度显著性逐年线性递增。1958—1975年全球海域的海表风速变化较为平缓,1975—1983年递增趋势较为强劲,年平均海表风速的峰值出现在1999年,波谷出现在1975年。②全球海表风速的变化趋势表现出较大的区域性差异。递增趋势明显的区域主要分布于:南极、热带大西洋海域、北太平洋西风带海域、印度洋中低纬度海域、南半球60°S附近大面积带状海域;呈显著性逐年递减的区域主要分布于:赤道中东太平洋、胡安·费尔南德斯群岛附近海域、南大西洋西风带的中部海域,以及一些零星海域。③全球海表风速的变化趋势表现出较大的季节性差异。在各月均表现出显著的线性递增趋势,以1月的递增趋势最为强劲,达到0.0103m·s-1·a-1,7月的递增趋势弱于其余月份,约0.0033m·s-1·a-1。④全球海域海表风速存在明显的2.2~4.3年变化周期,以及6.5年以上长周期震荡。  相似文献   

气枪震源水中能量辐射特性研究     

董明荣  符力耘  邢超  杨军  李孝宾 《中国地震》2018,34(1):25-34

基于云南宾川气枪主动源激发实验数据,对气枪震源水中能量辐射特性进行了分析研究,得到了气枪震源水中激发脉动气泡周期和最大半径的经验计算公式。结果表明:(1)气枪震源的能量辐射效率在垂直向下方向要高于水平方向;(2)垂直向下的气泡能辐射效率随着供气压力的增加而增大;(3)供气压力为15MPa时,气枪震源垂直向下的能量辐射效率为9.4%;(4)供气压力越大,气枪震源压力波叠加增强的持续距离越远。  相似文献   

Triple oxygen isotope constraints on the origin of ocean island basalts     

Xiaobin Cao  Huiming Bao  Caihong Gao  Yun Liu  Fang Huang  Yongbo Peng  Yining Zhang 《Acta Geochimica》2019,(3):327-334

Understanding the origin of ocean island basalts(OIB) has important bearings on Earth's deep mantle.Although it is widely accepted that subducted oceanic crust, as a consequence of plate tectonics, contributes material to OIB's formation, its exact fraction in OIB's mantle source remains ambiguous largely due to uncertainties associated with existing geochemical proxies. Here we show, through theoretical calculation, that unlike many known proxies, triple oxygen isotope compositions(i.e.D^(17 )O) in olivine samples are not affected by crystallization and partial melting. This unique feature, therefore, allows olivine D^(17 )O values to identify subducted oceanic crusts in OIB's mantle source. Furthermore, the fractions of subducted ocean sediments and hydrothermally altered oceanic crust in OIB's mantle source can be quantified using their characteristic D^(17 )O values. Based on published D^(17 )O data, we estimated the fraction of subducted oceanic crust to be as high as 22.3% in certain OIB, but the affected region in the respective mantle plume is likely to be limited.  相似文献   

浓海水冷冻脱盐技术研究     

张宁  苏营营  王新亭  朱校斌 《海洋通报》2009,28(2)

通过实验室冷冻离心实验,研究了浓海水的冷冻脱盐技术.实验研究了离心转速对冰冻的浓海水的脱盐和脱除钙镁离子的影响,并对多步冷冻脱盐前后余冰和浓海水的盐度分别进行分析,以及利用ICP-MS对其主要离子含鼍进行测定.实验结果表明,离心转速变化对冰冻浓海水脱盐、脱除钙镁离了的影响显著.各实验离心转速条件下,脱盐和脱除钙镁离了均有较好效果.脱除率均达到88.5%和87.4%以上.随着离心转速的提高,脱盐率提高,转速4 000 r/min达到最大,但是其变化幅度减小,进一步提高转速对脱盐率和钙镁离子脱除率的提高影响不大.经过多步冷冻脱盐发现,一次冷冻离心分离,得到的余冰的盐度脱除达到99.0%.通过与原浓海水离子含量相比,钾钙钠镁等主要离子含量降低为原浓海水的3%以下.而多步离心分离之后,得到的浓海水的盐度达到原浓海水的3.3倍.每步实验,均有低盐度,低离子含量的冰生成,冰的产最达到被处理的浓海水总体积的2/3以上.  相似文献   

Biosorption and desorption of Cd^2＋ from wastewater by dehydrated shreds of Cladophorafascicularis     

邓莉萍  朱校斌  苏营营  苏华  王新亭 《中国海洋湖沼学报》2008,26(1):45-49

The adsorption and desorption of algae Cladophora fascicularis and their relation with initial Cd^2＋ concentration, initial pH, and co-existing ions were studied. Adsorption equilibrium and biosorption kinetics were established from batch experiments. The adsorption equilibrium was adequately described by the Langmuir isotherm, and biosorption kinetics was in pseudo-second order model. The experiment on co-existing ions showed that the biosorption capacity of biomass decreased with an increasing concentration of competing ions. Desorption experiments indicated that EDTA was efficient desorbent for recovery from Cd^2＋. With high capacities of metal biosorption and desorption, the biomass of Cladophora fascicularis is promising as a cost-effective biosorbent for the removal of Cd^2＋ from wastewater.  相似文献   

参芪益肠汤对胃癌根治术后癌因性疲劳及其他各项指标的影响          下载免费PDF全文

景海波  周松阳  谭晓斌 《应用海洋学学报》2022,38(9):1

目的：观察参芪益肠汤对胃癌根治术后患者的癌因性疲劳、生活质量、胃肠功能及免疫功能的影响。方法：选取接受胃癌根治术的患者90 例,采用回顾性研究,按照术后是否使用参芪益肠汤分为治疗组和对照组,每组各45 例。对照组予以西医常规对症支持治疗,治疗组在对照组基础上加用参芪益肠汤治疗,疗程均为4周。比较2组治疗前后Piper疲乏量表评分、癌症患者生命质量测定量表（FACT-G）评分、淋巴细胞亚群指标［CD4₊、CD8₊、CD4₊/CD8₊、自然杀伤细胞（NK）］水平及治疗后胃肠功能恢复情况。结果：2组治疗后Piper疲乏量表评分、FACT-G各项指标评分和淋巴细胞亚群指标水平均较治疗前改善,且治疗组优于对照组（P＜0.05或P＜0.01）。治疗组肠鸣音恢复时间、肛门排气时间、排便时间均短于对照组,胃管总引流量较对照组减少,差异均有统计学意义（P＜0.01）。结论：参芪益肠汤可明显改善胃癌根治术后患者癌因性疲劳症状,促进胃肠功能恢复,增强机体免疫功能,提高生活质量。  相似文献   

低纬子午环为何能取得高精度观测数据     

王晓彬  陈林飞 《天文研究与技术》1997,(Z1)

叙述了低纬子午环在研制中没有对加工提出苛刻的高精度要求的原因，分析了仪器在目前状态下，仪器方位指向、水平轴指向和望远镜光轴指向的实际精度，论述了克服这些指向误差影响，提高观测精度的基本思路，以及仪器研制成功的关键所在。  相似文献   

我国吉林油田大情字井区块CO2地下埋存试验区地质埋存格架   总被引：1，自引：0，他引：1  

许志刚  陈代钊  曾荣树  郭凯  李元平  肖斌  王旭 《地质学报》2009,83(6):875-884

目前,我国在CO2地质埋存的试验研究才刚刚开始,其研究方法与研究思路需要不断探索。本文立足于吉林油田大情字井区块,从储层埋存潜力、埋存体稳定性及水文地质条件三个方面对试验区实施CO2地质埋存工程进行评价。通过对注CO2层段的储层砂体有效厚度、空间展布范围、储层物性及储层微观结构,以及在此基础上,对各砂体横向和垂向上的连续性、砂体间的连通性等等方面的分析和评价,试验区具备一定的埋存潜力,其有效储层厚度平均为273m;同时对试验区盖层的封盖性、断裂的稳定性及井筒的密封性三方面的评价,建立试验区埋存体稳定性评价体系。研究表明,试验区具备厚层泥岩封盖层、盖层内断裂不发育且比较单一以及储层内广泛发育隔夹层,可以有效地对CO2的运移或渗漏实施封盖和遮挡;另外,结合试验区矿化度、水化学成分的研究表明,试验区与邻近区域存在明显的矿化度分带特点、水化学成分也相对较单一以及含水层和隔水层均较发育。在一定程度上说明,试验区目的层段具有相对独立的地下水水体环境,比较有利于适合注入CO2,并进行地质埋存。通过这三方面的研究,建立大情字井区块适合CO2地质埋存的埋存格架,为该区实现CO2长期有效安全埋存奠定基础。  相似文献   

A Applied Method for Area AWS Checking with Mobile Phone     

Shi Tianqing  Li Xiaobin 《山东气象》2008,28(4)

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OBSERVATION AND INVESTIGATION OF VARIABILITIES OF BASELINE CO₂ CONCENTRATION OVER WALIGUAN MOUNTAIN IN QINGHAI PROVINCE OF CHINA^*          下载免费PDF全文

Wen Yupu  Shao Zhiqing  Xu Xiaobin  Ji Bingf  Zhu Qingbin 《Acta Meteorologica Sinica》1994,8(3):255-262

In-situ measurement of atmospheric CO₂ was made at the top of the Waliguan Mountain(36°17'N,100°54'E,3816 m asl).where the air is not directly affected by the local anthropogenic and natural sources,by using a nondispersive infrared(NDIR)analyzer and following the procedures proposed by WMO.The CO₂ in the flask samples collected on the mountain was also analyzed in a laboratory.The measurements uncover the daily,monthly and seasonal variabilities and the baseline level of the CO₂ in the air over the "clean" area of Chinese hinterland.Results suggest that the CO₂ concentration over the East Asia continent has evident periodical variation,similar to that of global distribution.In 1992,an annual mean baseline CO₂ concentration of 356.4 ppm over the continent was obtained.The annual mean value was 357.2 ppm for 1993.Some relationships between the CO₂ concentration at Waliguan and the weather conditions,especially,wind speed and direction are found through the observation.  相似文献