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61.
62.
分析探讨了东海近海水质无机氮类测定中不确定度的影响因素。其中,考虑到海洋环境监测的一些特殊性,在建立评定不确定度分量的数学模型时,引入了重复性实验校正因子f,并选取2004年东海区海洋环境监测中不同海域的试样进行原始平行性测定资料,以A类方式评定量化重复性实验校正因子f的不确定度分量;同时,以A类或B类的方式对近海水质无机氮类测定中的其它各个不确定度分量进行了评定。结果表明,NH_4~ 测定的相对合成标准不确定度分量最大,重复性实验校正因子f是近海水质无机氮类测定不确定度的主要来源。在此基础上,计算了东海近海水质无机氮类(NO_2~-、NO_3~-、NH_4~ )测定中的相对合成标准不确定度分别约为0.080,0.034,0.10。 相似文献
63.
珠江口海域无机氮和活性磷酸盐含量的时空变化特征 总被引:17,自引:1,他引:17
主要利用1998年在珠江口海域连续同步观测资料,研究该海域无机氮、活性磷酸盐含量和富营养化状况。结果表明,无机氮主要来自四个口门的径流,但深圳湾附近的陆源亦有一定贡献;无机氮的形态主要以硝酸氮为主,而在深圳湾附近海域则以氨氮为主;无机氮含量普遍超过0.30mg/dm^3的我国海水水质标准二类标准值,大部分海域已超过0.50mg/dm^3的四类水质标准值,径流对活性磷酸盐含量的贡献不显著,而深圳湾附近的陆源则有明显的贡献,从珠江口附近由沿岸流和涨潮流带来的活性磷酸盐亦有明显的影响;除深圳湾附近海域活性磷酸盐含量超过0.030mg/dm^3的二类海水水质标准值外,其他海域基本符合0.015mg/dm^3的一类海水水质标准值要求。该海域的N/P值普遍较高,而且北部海域的高于南部海域;最高值超过300,最小值也大小30;该水域的营养盐主要为磷限制。 相似文献
64.
Marcelo F. L. Souza Bjrn Kjerfve Bastiaan Knoppers Weber F. Landim de Souza Raimundo N. Damasceno 《Estuarine, Coastal and Shelf Science》2003,57(5-6):843-858
Lagoa de Araruama in the state of Rio de Janeiro, Brazil, is a hypersaline lagoon with salinity varying spatially from 45 to 56. We collected water samples during monthly cruises throughout the lagoon, and along the streams feeding the system, from April 1991 to March 1992. Nutrients and other water quality parameters exhibited great spatial and temporal variations. Mass balance calculations indicate large amounts of anthropogenic nutrient inputs. The data indicate that the lagoon currently is oligotrophic but is in a state of transition to become a mesotrophic system. Molar dissolved inorganic nitrogen:dissolved inorganic phosphorus (DIN/DIP) varied between 2.2:1 and 659:1 with a volume-weighted average of 22:1. The high DIN/DIP ratio contrasts with that found in nearby lagoons, suggesting that phytoplankton primary production is limited by phosphorus in Lagoa de Araruama. The major loss of DIP is apparently driven by biological assimilation and diagenic reactions in the sediments. Calculations indicate that the lagoon is slightly net autotrophic at +0.9 mol C m−2 yr−1. This suggests that the biomass of the primary producers is restricted by phosphorus availability. Phosphorus retention in the sediment and the hypersaline state of the lagoon prevent changes in autotrophic communities and the formation of eutrophic conditions. 相似文献
65.
66.
本文报道了1987年夏、冬两个航次在26°50′~32°30′N,124°30′~131°30′E海区中可溶性无机磷酸盐的调查结果,阐明了磷的分布特征和形成机制。结果表明陆架区表层测值较高,大洋区为低值区,底层则相反。大洋水常年分层,中层水有爬坡涌升现象,其浓度与Aou呈正相关,与pH和S呈负相关。夏、冬两季底层磷与Aou呈正相关,其浓度变化主要依赖于生物过程。 相似文献
67.
Helen C. Bostock Bruce W. HaywardHelen L. Neil Kim I. CurrieGavin B. Dunbar 《Deep Sea Research Part I: Oceanographic Research Papers》2011,58(1):72-85
We have compiled carbonate chemistry and sedimentary CaCO3% data for the deep-waters (>1500 m water depth) of the southwest (SW) Pacific region. The complex topography in the SW Pacific influences the deep-water circulation and affects the carbonate ion concentration ([CO32−]), and the associated calcite saturation horizon (CSH, where ??calcite=1). The Tasman Basin and the southeast (SE) New Zealand region have the deepest CSH at ∼3100 m, primarily influenced by middle and lower Circumpolar Deep Waters (m or lCPDW), while to the northeast of New Zealand the CSH is ∼2800 m, due to the corrosive influence of the old North Pacific deep waters (NPDW) on the upper CPDW (uCPDW). The carbonate compensation depth (CCD; defined by a sedimentary CaCO3 content of <20%), also varies between the basins in the SW Pacific. The CCD is ∼4600 m to the SE New Zealand, but only ∼4000 m to the NE New Zealand. The CaCO3 content of the sediment, however, can be influenced by a number of different factors other than dissolution; therefore, we suggest using the water chemistry to estimate the CCD. The depth difference between the CSH and CCD (??ZCSH−CCD), however, varies considerably in this region and globally. The global ??ZCSH−CCD appears to expand with increase in age of the deep-water, resulting from a shoaling of the CSH. In contrast the depth of the chemical lysocline (??calcite=0.8) is less variable globally and is relatively similar, or close, to the CCD determined from the sedimentary CaCO3%. Geochemical definitions of the CCD, however, cannot be used to determine changes in the paleo-CCD. For the given range of factors that influence the sedimentary CaCO3%, an independent dissolution proxy, such as the foraminifera fragmentation % (>40%=foraminiferal lysocline) is required to define a depth where significant CaCO3 dissolution has occurred back through time. The current foraminiferal lysocline for the SW Pacific region ranges from 3100-3500 m, which is predictably just slightly deeper than the CSH. This compilation of sediment and water chemistry data provides a CaCO3 dataset for the present SW Pacific for comparison with glacial/interglacial CaCO3 variations in deep-water sediment cores, and to monitor future changes in [CO32−] and dissolution of sedimentary CaCO3 resulting from increasing anthropogenic CO2. 相似文献
68.
Stable carbon isotope ratios have been used to study the sources of particulate organic carbon (POC) and total dissolved inorganic carbon in the Orinoco Basin. The isotopic composition of total dissolved inorganic carbon shows a range of from -8·1 to -23·0 ppt, an indication of dominance of biological processes. The isotopic composition of POC exhibits a range of from -24·1 to -34·6 ppt with little seasonal variation. The isotopic evidence indicates that the POC is predominantly of terrestrial origin rather than a result of in situ planktonic production. The similarity of isotopic composition of POC and coastal sediments suggests that riverine organic detritus has been transported 30-50 km offshore in a direction parallel to the Orinoco river channel. 相似文献
69.
为查明在鲤鱼配合饲料中添加无机盐的实际效果,在水库网箱中进行了饲料中添加不同无机盐对鲤生长影响的试验研究。结果表明:饲料中添加磷有稳定的积极作用,为必须添加的营养元素;而实验中添加的锌、镁和铜等成分则有负作用,故额外添加和水中含量较高会对鲤鱼生长产生抑制作用。另外,还发现多种元素混合使用时,有相互拮抗作用,减少了磷的正作用及锌、铜的负作用。据此认为,在鲤鱼配合饲料中添加混合无机盐定型产品不一定能达到预期效果,其配方应与配合饲料中大量成分的配方相结合 相似文献
70.
根据1988年7月调查资料讨论了台湾海峡中北部海域夏季上升流区各种形态磷的分布特征。结果表明,上升流中心区(即海坛岛东侧一带水域)具有低温、高盐、低溶解氧;DIp,TDP,PP,TP较高;DOP较低(0.27);及DIP/DOP比值(约为1)较高的特性。DOP是该海域磷的主要形态(占TP的49.2%),其含量分布及其形态转化与生物活动直接相关,是该海域生物生产力高的体现。 相似文献