杭州湾及邻近水域营养盐的时空分布与富营养化特征   总被引：7，自引：0，他引：7  

高生泉  陈建芳  金海燕  王奎  卢勇  李宏亮  陈法锦 《海洋学研究》2011,(3):36-47

利用2006年7月-2007年11月杭州湾及邻近水域春、夏、秋、冬四个季节的调查资料,对其营养盐的分布变化及富营养化特征进行了分析.结果表明:杭州湾及邻近水域营养盐的分布变化和富营养化不仅与湾内河流高DIN、磷、硅的输入直接有关,同时受长江冲淡水的影响十分显著.湾内营养盐的分布变化主要受物理混合作用所控制,浮游生物活动...  相似文献   

长江口及邻近海域表层水体溶解氧饱和度的季节变化和特征   总被引：3，自引：0，他引：3  

卢勇  李宏亮  陈建芳  金海燕  陈法锦  高生泉  王奎  王文亮  白有成 《海洋学研究》2011,(3):71-77

根据“908”ST04区块调查的夏、冬、春、秋季四个航次和“908”补充调查的8月航次资料对长江口及邻近海区表层水体溶解氧及其饱和度进行了探讨.研究表明东海北部表层水体在夏季和春季以浮游植物光合作用为主要控制过程,特别是7、8月份长江口外、杭州湾外及浙江近海存在大范围的强光合作用区;秋季以有机质氧化分解过程为主,表层溶...  相似文献   

A note on modeling double diffusive mixing in the global ocean     

Lakshmi Kantha  Sandro Carniel  Mauro Sclavo 《Ocean Modelling》2011,36(1-2):40-48

Though ubiquitous in the global oceans, double diffusive mixing has been largely ignored or poorly represented in the models of turbulent mixing in the ocean and in 3-D ocean models, until recently. Salt fingers occur in the interior of many marginal seas and ocean basins, the Tyrrhenian Sea and the subtropical Atlantic being two examples. Diffusive convection type of double diffusion occurs in the upper layers of many sub-polar seas and polar oceans due to cold melt water from sea ice. Consequently, it is important to be able to properly parameterize double diffusive mixing in basin scale and global ocean models, so that the water mass structure in the interior of the ocean can be properly simulated. This note describes a model for double diffusive mixing in the presence of background shear, based on Mellor–Yamada type second moment closure, more specifically Kantha, 2003, Kantha and Clayson, 2004 second moment closure models of resulting turbulence, following Canuto et al. (2008a) but employing a different strategy for modeling the pertinent terms in the second moment equations. The resulting model is suitable for inclusion in ocean general circulation models.  相似文献   

Isotopic estimation of the evapo-transpiration flux in a plain agricultural region (Po plain,Northern Italy)     

《Applied Geochemistry》2013

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海气界面动量通量算法的改进   总被引：1，自引：0，他引：1  

王晨迪  费建芳  丁菊丽  胡瑞卿  周祖刚  田斌 《热带气象学报》2017,33(5):627-636

COARE（Coupled Ocean-Atmosphere Response Experiment）算法是国际上较先进的计算海气界面通量的算法。最新的COARE 3.0算法包含TY01方案和O02方案两种考虑真实海浪状态的海面空气动力学粗糙度方案;当有效波高和谱峰周期缺省时,利用Taylor01风浪特征量参数化方案可对它们进行参数化。在此基础上引入自主设计的WHP（Wind-wave significant wave Height and dominant wave Period）风浪特征量参数化方案和三种海面空气动力学粗糙度方案,即SCOR方案、GW03方案、PYP07方案以及更简单的Andreas12、Vickers15摩擦速度算法,利用NDBC（National Data Buoy Center）浮标数据、解放军理工大学风浪流水槽实验数据,针对中高风速条件（10 m/s≤U₁₀≤25 m/s）比较上述方案对摩擦速度的预测效果。结果表明:WHP方案在COARE 3.0算法中的应用效果优于Taylor01方案,且新引入的SCOR、GW03、PYP07海面粗糙度方案对风浪特征量的观测误差敏感性更小、稳定度更高;水槽实测数据的对比结果表明,WHP方案结合SCOR海面粗糙度方案计算的摩擦速度与实测值最接近;引入其他三种实测数据的检验结果表明,原始COARE 3.0算法会低估摩擦速度,而WHP方案结合SCOR海面粗糙度方案能更准确地预测摩擦速度随10 m风速的增长趋势。   相似文献   

气溶胶对台风“天兔”中闪电的影响   总被引：1，自引：2，他引：1  

眭敏  刘宇迪  杨桃进 《热带气象学报》2017,33(5):728-740

运用WRF模式配合对气溶胶更敏感的F-SBM微物理方案以及LPI闪电参数化方案对台风“天兔”进行模拟,通过改变F-SBM微物理方案中的云凝结核浓度得到不同气溶胶浓度下“天兔”中水凝物和闪电的分布情况,并从微物理过程出发讨论了气溶胶浓度对“天兔”中闪电的影响。WWLLN观测数据显示,“天兔”中的闪电主要呈现三圈分布,且“天兔”眼壁区闪电的爆发现象发生在其迅速加强阶段。对比发现,LPI指数与WWLLN观测实况的闪电分布形状有较好的对应,并且描绘出“天兔”中闪电的发展变化情况。通过气溶胶敏感性试验发现,随着气溶胶浓度的增加,“天兔”中过冷水含量及霰粒子浓度增加,垂直运动整体增强,为闪电的生成提供有利条件,此时LPI指数分布更加密集,强度增强。而冰晶粒子浓度始终较低,可初步推断“天兔”中闪电主要由霰粒子与雪粒子的非感应起电产生   相似文献   

不同陆面方案对降水模拟的影响     

刘向培  王汉杰  何明元  史小康 《水科学进展》2013,24(5):658-666

基于区域气候模式RegCM4.0(Regional Climate Model 4.0),分别选取BATS(Biosphere Atmosphere Transfer Scheme)和CLM(Community Land Model)陆面方案,对2001-2005年中国的气候状况进行模拟,并将模拟结果与CRU(Climatic Research Unit)及GPCP(Global Precipitation Climatology Project)降水资料进行对比,研究不同陆面方案对降水模拟的影响。结果表明:在两种陆面方案下,区域气候模式均较合理地模拟出了中国降水的空间分布、时间变化;模拟降水对陆面方案敏感,RegCM_BATS总体上表现为正偏差,在东北区域的模拟偏差较大;RegCM_CLM表现为负偏差,在长江以南区域的模拟偏差较大;模拟结果的偏差在夏季较大,冬季较小;两模式模拟结果间的差异在空间上由东南向西北减少;两模式均较准确地模拟了不同强度降水出现频率的分布形势,总体上RegCM_CLM模拟低强度降水偏多;高强度降水偏少,而RegCM_BATS模拟低强度降水偏少,高强度降水偏多;不同陆面方案对地表蒸发量以及地表潜热通量模拟的差异是导致模拟降水差异的主要原因,夏季地表蒸发对降水的影响较冬季更强;水汽平流输送对两模式模拟降水差异的影响较小。  相似文献   

我国海洋学科研究生培养专业开设现状分析与展望          下载免费PDF全文

王辉赞  张韧  冯芒  刘科峰  曾文华  张文静 《海洋开发与管理》2016,33(4):90-93

21世纪是海洋的世纪,海洋强国战略的实施需要海洋科学人才支撑。通过对我国已有的涉及海洋科学学科研究生培养的高校和研究所的全面调研和分析比较,总结我国海洋科学研究生学科专业开设院所、依托平台、专业开设的现状、取得的成果,指出目前我国海洋科学方向研究生教育学科专业开设与建设海洋强国战略人才需求之间的矛盾和存在的不足,提出相应的建议和展望,旨在为我国海洋科学学科的研究生教育和人才培养提供有益的借鉴和参考。  相似文献   

Meteoric smoke particle properties derived using dual-beam Arecibo UHF observations of D-region spectra during different seasons     

J.T. Fentzke  D. Janches  I. Strelnikova  M. Rapp 《Journal of Atmospheric and Solar》2009,71(17-18):1982-1991

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The North Atlantic Oscillation—What Role for the Ocean?     

《Atmospheric Science Letters》2000,1(2):89-100

The extent to which the North Atlantic Oscillation (NAO) is influenced by changes in the ocean state is an issue that has attracted much recent attention. Although there have been counter claims, the weight of evidence clearly suggests that forcing by the ocean of year-to-year changes in the NAO is a weak influence by comparison with atmospheric internal variability. The NAO is thus very different in character to the Southern Oscillation (SO), and its predictability—at least on seasonal-to-interannual timescales—is almost certainly much lower.Although weak, the influence of the ocean on the NAO is not negligible. In a previous study we found that wintertime North Atlantic climate, including the NAO, was significantly influenced by a tripole pattern of North Atlantic SST anomalies. Here we report the results of experiments to further elucidate the nature of this influence. We show that the tripole pattern induces a significant response both in the tropical Atlantic and at mid-to-high latitudes. The low latitude response is forced by the low latitude SST anomalies, but the high latitude response is influenced by the extratropical SST anomalies as well as those in the tropics. Furthermore, we find evidence of nonlinear interaction between the influence of the tropical and extratropical SST anomalies. Lastly, we investigate the feedback from the atmosphere onto the SST tripole. We find that the expected negative feedback is significantly modified at low latitudes by the dynamical response of the atmosphere.  相似文献