Suspended sediment transport and deposition in the Zhoushan Archipelago sea area     

Rijun Hu  Jianzheng Wu  Longhai Zhu  Fang Ma 《中国海洋大学学报(英文版)》2009,8(4):343-351

The transport mechanism and settlement characteristics of suspended sediments are analyzed in this article on the basis of measured data. Results indicate that the concentration and flux of suspended sediments decrease sharply from Hangzhou Bay to the offshore area. Suspended sediment transport is mainly controlled by advection transport and gravitational circulation transport. The settling velocity of suspended sediments gradually decreases from Hangzhou Bay to the offshore area. The settlement of suspended sediments mainly takes place during the turning phase of the tidal currents.  相似文献   

流体剖面上溶解硫酸盐的含量能否反映原地甲烷通量     

Miriam kastner  成海燕 《海洋地质前沿》2009,25(2):24-24

在天然气水合物稳定带中，受生物地球化学因素制约的甲烷通量是控制天然气水合物分布和含量的关键。我们将通过非保压岩心和保压岩心数据进行说明，这些数据分别来自孟加拉海两个海盆：克里希纳河－哥达瓦里河盆地（K—G）和印度东南部近海的Mahanadi盆地（水深9001170m），以及位于安达曼海（水深1600m）的1个站位和卡斯卡底古陆（水深890m）的水合物脊上的2个站位。以上所有站位都发现了天然气水合物存在的证据，但每个站位水合物的含量、分布和含水合物沉积物的结构各不相同。  相似文献   

汝州地矿局:地灾隐患点入汛再过二遍箩     

连宏志  陈亚强  王大庆 《河南国土资源》2009,(7)

六月天,骄阳似火,热浪袭人。汝州市大峪乡班庄村的坡坡岭岭上遍地金黄,一派丰收在望的景象。"这大热天的,路这么远,打个电话交代一下就中的事儿还劳烦您跑一趟。其实这几年,年年搞地质灾害防治,乡亲们的警惕性都高着呢,只要有个天阴下雨的,随时盯着坡上的变化。再说了,事关自己的安危谁能不上心呀?"班庄村党支部书记孙梅红一边把地矿局的同志往屋里让,一边又说:"放心吧,就算地里活儿再忙,咱也肯定把后山的滑坡给盯死了!"  相似文献   

2006～2007年北部湾海-气热通量变化特征     

盛立芳  郑元鑫  陈静静  王丹 《中国海洋大学学报(自然科学版)》2009,39(4)

用2006年夏～2007年秋在北部湾获得的船测气象资料,由块体公式计算了海-气通量.结果表明:北部湾春、夏季节获得热通量,而秋、冬季节失去热通量.春季通过湍流交换造成的热通量对海面热平衡的贡献最小,其次是夏季、冬季和秋季.在年平均尺度上感热通量和潜热通量分别占净辐射通量的7.4%和77.4%,15.2%的净辐射热量通过海洋过程消耗掉.感热通量随海-气温差的加大而增大,而与风速之间呈现复杂的非线性关系.海-气温差增加1 ℃,感热通量增加6.7～12.7 W/m2;较大的感热通量(>30 W/m2)容易出现在5～10 m/s风速条件下.潜热通量与风速和相对湿度呈明显的相关关系:风速增加1 m/s,潜热通量增加约18 W/m2,而相对湿度下降1%会导致6 W/m2潜热通量的增加.  相似文献   

Transpiration rates of Carex Meyeriana in relation to micrometerological factors in a mountain valley wetland     

Huifeng Xu  Yanming Jin  Wei Deng  Kezhang Xu  Zhen Wang 《山地科学学报》2009,6(3):293-298

In order to reveal transpiration rates of wetland plants and its relationships to micro- meterological factors in a mountain valley wetland, relative humidity, air temperature, leaf temperature, soil temperature, photo flux density and transpiration rates were measured once two hours in a Carex meyeriana wetland of the Changbai Mountain valley in dry （July） and wet （September） of 2003, respectively. Results showed that the tendency of ＂decreasing after increasing＂ was obvious in wet season. However, a relatively stable trend was observed for the transpiration in dry season.. Generally, the photon flux density of Carex meyeriana was higher in wet season than that in dry season. However, the variabilities of leaf temperature, air temperature and relative humidity were similar in both seasons. Higher transpiration rates of Carex meyeriana leaves were observed in July （varied from 40 to 150 mol.m^-2.s^-1） compared to those （varied from 7 to 14 mol.m^-2.s^-1） in September. Transpiration rates were significantly correlated with air temperature （P〈0.01）, leaf temperature （P〈0.01）, and wind speed （P〈0.05）, but correlationship between relative humidity and photo flux density was not significant （P〈0.05）.  相似文献   

Distribution of Dissolved Inorganic Carbon （DIC） and Its Related Parameters in Seawater of the North Yellow Sea and off the Qingdao Coast in October, 2007     

Hongwei Ji  Guiyun Sheng  Huizhen Xin  Yuanyuan Sha 《中国海洋大学学报(英文版)》2009,8(4):366-376

Data on the distribution of dissolved inorganic carbon (DIC) were obtained from two cruises in the North Yellow Sea (NYS) and off the Qingdao Coast (QC) in October, 2007. Carbonate parameters were calculated. The concentrations of DIC are from 1.896–2.229 mmolL⁻¹ in the NYS and from 1.939–2.032 mmolL⁻¹ off the QC. In the southwest of the NYS, DIC in the upper layers decreases from the north of the SP (Shandong Peninsula) shelf to the center of the NYS; whereas in the lower layers DIC increases from the north of the SP shelf to the center of the NYS and South Yellow Sea. In the northeast of the NYS, DIC in all layers increases from the YR (Yalu River) estuary to the centre of the NYS. The distribution of DIC in NYS can be used as an indicator of Yellow Sea Cold Water Mass (YSCWM). Air-sea CO₂ fluxes were calculated using three models and the results suggest that both the NYS and the QC waters are potential sources of atmospheric CO₂ in October.  相似文献   

临朐山旺古动物群简介     

吕伟  马学民  王宗花  李俊德 《山东国土资源》2009,25(8):63-67

山旺国家自然保护区于1980年国务院批准公布，面积1．2km2，位于临朐县城东22km处，该区为玛珥湖，蕴藏古生物化石丰富，种类繁多，目前已发现10多个门类700多种，形成于新近纪中新世，距今约1800万年。  相似文献   

Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a   总被引：3，自引：1，他引：2  

FENG Xuwen  JING Xianglong  YU Xiaoguo  LI Hongliang  CHEN Jianfang  QIAN Jiangchu 《海洋学报(英文版)》2008,27(6):49-61

The upwelling area in the Changjiang Estuary was selected to collect the core, where the red tide occurred frequently and hypoxic existed. The total organic carbon （TOC）, total nitrogen （TN）, biogenic silica （BSi） and stable organic carbon isotopic ratios（δ13 Corg） were determined on the 210pb-dated sediment core. The concentrations of TOC, TN, BSi as well as their sedimentation fluxes have in- creased to some extent since the 1970s. TOC and TN fluxes increased about 45%, 36% respectively. The average δ13 Coorg value in the core was -23.67 ×10^-3 which remained nearly constant before the 20 century. The δ13 Corg values increased after the 1900s, two marked increases were observed from the 1950s and the 1970s. A simple δ13 Cors model was used to estimate the contribution of terrigenous and marine organic matter inputs for the sediment, which indicated the increase in accumulation since the 1970s has been almost exclusively marine. The increasing of marine organic matter accumulation （TOC, TN and BSi） was corresponding with the increasing of fertilizer consumption and the NO3-N budgets from the Changjiang River. The riverine runoff of fertilizers and nutrients stimulated the algae blooming. Enhanced primary production resulted in an enrichment of organic matter in the sediment. These data support the hypothesis that anthropogenic nutrient loading has been a significant factor on the eutrophication in the Changjiang Estuary.  相似文献   

阿拉伯海东部边缘地区的有机和无机碳的浓度与埋藏通量   总被引：3，自引：0，他引：3  

R Bhushan  夏非 《海洋地质前沿》2008,24(12):15-20

海洋中到达海底的生物生产力的剩余部分包括以有机（Corg）和无机（主要是CaCO3）形式存在的碳物质与二氧化硅（SO2）。在海洋中，它们的浓度和目前的沉积通量（也称作是“rain rates”）可以通过沉积物捕获的方式来确定。海洋沉积物保留着这些记录，并且提供了过去沉积通量的信息。阿拉伯海是一个以高生物生产力（季风引起的）而著称的地区（Qasim，1977；Madhupratap等，1996），  相似文献   

碘甲烷的海洋化学研究进展     

陆小兰  杨桂朋  宋贵生  张亮 《海洋通报》2008,27(2):103-110

评述了海洋环境中碘甲烷的来源、分布、迁移和转化等过程的研究进展,并探讨了该领域有待进一歩研究的问题.开展碘甲烷的海洋化学研究,有助于了解海洋中碘元素的生物地球化学循环及其对大气臭氧层的重要保护作用.  相似文献