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1.
闽浙沿岸海域溶解态铝的分布及其影响因素 总被引：4，自引：2，他引：2
闽浙沿岸海域是我国赤潮多发区之一,为研究浮游植物对铝的清除提供了良好的场所。于2007年5月和2008年5月对该区域溶解态铝的分布进行了调查分析,讨论了水团混合、悬浮颗粒物以及浮游植物水华对溶解态铝分布的影响,结果表明,溶解态铝的分布表现为近岸高、远岸低、表层浓度低于底层的特点,统计分析显示两年观测的结果无显著差异。影响溶解态铝分布的因素主要有水团混合和底沉积物的再悬浮,此外浮游植物水华对溶解态铝也具有一定的清除作用。 相似文献
2.
基于2011-04,2011-08,2011-10和2012-01对桑沟湾海域大面调查的资料,利用改进的荧光镓(LMG)分子荧光光谱分析法测定溶解态铝的含量,研究了桑沟湾溶解态铝的分布和季节变化特征。结果表明,4个航次桑沟湾溶解态铝的平均浓度分别是(47.3±14.4),(56.0±14.6),(64.5±11.3)和(32.1±6.0)nmol/L,呈现出明显的季节变化,即秋季最高,夏季、春季次之,冬季最低。除几个异常站位外,溶解态铝的分布大致呈现随离岸距离的增加其浓度逐渐降低的趋势。夏季表层溶解态铝的浓度在近岸出现低值,夏、秋季湾口北部均出现高值。影响桑沟湾溶解态铝分布的主要因素包括与黄海的水交换、河流及地下水、浮游植物和养殖生物、悬浮颗粒物。根据简单箱式模型对桑沟湾溶解态铝的通量进行了估算,结果显示,除了河流和大气沉降外,桑沟湾溶解态铝还存在其他的源。与相邻的爱莲湾和俚岛湾相比,桑沟湾溶解态铝的浓度在春季较高,在夏季较低。与世界大洋相比,桑沟湾溶解态铝的浓度全年均较高。 相似文献
3.
于2014年10月和2015年6月对珠江口、南海北部陆坡区域溶解态铝的分布进行观测,探讨影响其分布及季节差异的主要因素,并以其作为示踪因子探讨潜在的陆源物质跨陆架输送途径。研究结果显示,夏、秋季珠江口盐度为0时溶解态铝的浓度分别为690.0 nmol/L和360.0 nmol/L,在淡咸水混合初期溶解态铝迅速自水体清除,夏季的清除率(55.8%)大于秋季(29.7%)。在南海北部陆坡区域,夏季表层溶解态铝浓度表现为沿纬线方向西高东低的分布特点,秋季则相反;夏、秋季底层溶解态铝浓度均呈现出随着离岸距离增加逐渐降低的分布趋势。秋季溶解态铝浓度的分布与盐度呈现显著的负相关关系,表明其行为近乎保守,陆架混合水及黑潮次表层水等水团混合是影响南海北部陆坡区域溶解态铝分布的主要因素。并且以溶解态铝作为示踪因子发现,在21.6~22.2 kg/m^3密度面区间存在自陆架向陆坡方向的跨陆架输送。而夏季陆坡中部受到珠江冲淡水的影响出现低盐水舌,但溶解态铝的浓度相对较低,表现出明显的不保守行为。浮游植物的清除作用是导致夏季陆坡区域溶解态铝分布异常的重要因素。 相似文献
4.
为研究陆架边缘海锰的生物地球化学循环,利用隐色孔雀绿-高碘酸钠催化动力学方法,对2012-03和2012-07长江口及其邻近海域调查航次采样的溶解态锰浓度进行测定。2012-03长江口及其邻近海域表、底层水体中溶解态锰浓度没有显著性差异。2012-07底层溶解态锰浓度显著高于表层。溶解态锰浓度存在显著的季节差异,2012-07平均浓度显著高于2012-03的。春、夏季溶解态锰浓度在表、底层分布整体上均呈现出由近岸到外海逐渐降低的特征,表明近岸受到河流输入的影响。2012-03长江口及其邻近海域溶解态锰基本表现为保守混合,2012-07盐度2~8海域表层发生明显的清除。两端元混合模型及相关性分析表明,该海域悬浮颗粒物(SPM)是溶解态锰的一个主要汇。此外,水团的物理混合是影响该海域溶解态锰分布的主要因素。 相似文献
5.
2011年11月28日至2012年1月12日期间,通过对南海18°N至5°N海域25个站点78个溶解态铝样品的采集分析及所获得的浮游植物数据,首次研究报道了南海中南部海域溶解态铝的空间分布特征,探讨其与浮游植物群落结构之间的关系。结果表明,表层海水中溶解态铝平均含量138.3±39.1nmol·L-1,呈现陆架高、海盆和岛礁区低的水平分布特点;表层浮游植物共57属132种,分别属于硅藻门38属72种,甲藻门18属58种,蓝藻门1属2种,细胞总丰度在(0.75~21.09)×103cell·dm-3之间,表层溶解态铝的分布与甲藻总丰度(n=22,r=0.55,p0.01)具有显著的正相关性。就垂直分布而言,溶解态铝在0~100m水深内变化剧烈,在100~300m深度范围内,溶解态铝变化不明显,200m处稍有增加;溶解态铝的垂直分布与营养盐相关性不显著,与叶绿素a浓度(n=16,r=0.58,p0.05)、浮游植物总丰度(n=16,r=0.59,p0.05)和甲藻总丰度(n=15,r=0.69,p0.01)显著正相关,推测冬季溶解态铝对南海甲藻生长具有一定促进作用。 相似文献
6.
海南万泉河、文昌/文教河河口溶解态铝的分布及季节差异 总被引：2，自引：0，他引：2
本文讨论了2006年12月冬季和2007年8月夏季海南省万泉河、文昌/文教河河流及河口溶解态铝的含量、分布及季节差异。结果发现,万泉河冬、夏两季河流及河口溶解态铝的平均含量分别为(156±127)和(157±97)nmol/L,季节差异不明显。文昌/文教河冬、夏两季河流及河口溶解态铝的平均含量分别为(242±156)和(222±66)nmol/L,冬季溶解态铝的平均含量略高于夏季。万泉河溶解态铝在河海混合初期表现为清除行为,而后表现为保守混合行为,而文昌/文教河则表现出明显的非保守混合行为,在中等盐度区域存在明显外源输入,原因可能是八门湾底沉积物再悬浮过程中释放的影响。部分河流上游采样点由于受到人为活动引起的污水排放的影响,溶解态铝含量明显增加。万泉河、文昌/文教河溶解态铝的平均含量明显低于我国其他及世界主要河流。 相似文献
7.
分别于2012年3月和7月对长江口及其邻近海域水体中溶解态铝的分布及其影响因素进行了研究,并在2012年3月至2013年11月期间对长江徐六泾进行了连续观测。结果表明,徐六泾溶解态铝在夏季出现最高值,在冬季呈现最低值,平均值分别为(313±130)nmol/L和(140±43)nmol/L,表现出与径流量相似的季节变化规律。受陆源输入变化的影响,长江口溶解态铝的浓度由近岸向外海逐渐降低,且呈现出明显的季节性差异,即7月明显高于3月。3月表、底层海水中溶解态铝的浓度范围分别为21~129 nmol/L和27~146 nmol/L,平均值分别为(49±21)nmol/L和(59±27)nmol/L;7月表、底层溶解态铝的浓度范围分别为6~332 nmol/L和9~252 nmol/L,平均值分别为(66±69)nmol/L和(83±74)nmol/L。在7月,表、底层溶解态铝呈现显著性差异,底层沉积物的再悬浮可能是造成差异的主要原因。调查结果表明,溶解态铝在长江口呈现出清除型行为,清除主要发生在咸淡水混合初期,初步计算出7月份溶解态铝的清除率约为55%。 相似文献
8.
本文利用2019—2021年在黄河口及莱州湾海域进行的4次陆海同步调查结果,分析了环莱州湾主要入海河口和排污口陆源输入磷的季节变化、黄河口及莱州湾海域内不同形态磷及不同碱性磷酸酶活性(APA)的时空分布特征,探讨了海域内磷受限状况及浮游植物和浮游细菌对低磷胁迫的响应。结果表明,磷的陆源输入中黄河贡献最大,小清河次之;总磷(TP)入海通量呈现出夏季>春季>秋季>冬季的季节变化,春、夏、秋季磷输入以颗粒态磷(PP)为主,冬季以溶解态磷(DP)为主;受农业施肥及河道内浮游生物活动的影响,春季陆源DP以溶解有机磷(DOP)为主,其他季节以活性磷酸盐(PO4-P)为主。研究海域内TP浓度及构成不仅受陆源输入的影响,还受浮游生物消亡、海上养殖活动和沉积物释放等作用共同调控,TP浓度呈现出春季>夏季≈秋季>冬季的季节变化、近岸高远岸低的分布特征,高值区主要位于黄河和小清河河口区域;TP构成上,春季以DP为主,夏、秋季DP与PP相当,冬季以PP为主;春、秋季DP以DOP为主,而夏、冬季DP以PO4-P为主。海域内浮游植物普遍受到... 相似文献
9.
通过楚科奇海北部–加拿大海盆西侧交接地带的生态调查,我们发现0～150 m海域水体中以融冰水(MW,0～20 m)、白令海夏季水(s BSW)和阿拉斯加沿岸流(ACW)等水团为主。水温和营养盐变化与水团息息相关,物理–生化的耦合作用进一步影响了浮游植物分布和群落结构。叶绿素a浓度最大值多位于约50 m深、富含营养盐的s BSW和ACW暖水团中。sBSW和ACW中分别以小型(占比约74%)和微微型(占比约65%)浮游植物为主。藻华初期,溶解无机氮(DIN)虽呈相对限制状态,但仍高于浮游植物生长所需阈值。双单元混合模型显示：浮游植物对氮去除明显,氮吸收量与叶绿素a浓度呈正比,且在温度略高的ACW水团中氮吸收量高于s BSW水团。在北极变暖、波弗特流涡增强以及ACW和sBSW营养盐补给下,该区域的浮游植物的叶绿素a浓度(均值：(0.327±0.163)mg/m3,范围：0.04～0.69 mg/m3)与历史数据相比有所提高。这将增加北极海区的碳吸收通量,有利于其作为碳汇区的发展。 相似文献
10.
三峡大坝启用后长江口及邻近海域秋季悬浮体、叶绿素分布特征及影响因素 总被引：2，自引：0，他引：2
基于2010年10月在长江口海域海洋综合调查,利用多参数CTD现场调查数据、悬浮体浓度测定数据,对该区悬浮体和叶绿素的空间分布及影响因素进行系统的研究,探讨三峡工程蓄水7a以来长江口的悬浮体和叶绿素的分布特征及变化.结果表明:浊度值与悬浮体浓度存在良好的线性关系,盐度对该线性关系没有明显的影响;长江口及其邻近海域悬浮体主要分布在123°E以西的海域,表现为近岸高、离岸低,表层低、底层高,其分布主要受到水团、长江输入、上升流等的影响;叶绿素在123°E往东的海域含量较高,近岸低,在123°E～124°E之间叶绿素含量最高,其分布主要受到水团、浮游植物种类和季节变化及营养盐的共同影响.与三峡工程蓄水前对比,悬浮体高值区的界限往西移动了近半个经度,同季节的叶绿素含量的平均值降低. 相似文献
11.
The distribution of dissolved (soluble and total) and particulate (leachable and total) aluminum was examined in the Columbia River and estuary, in near-field and far-field river plumes, and in adjacent coastal waters of Washington and Oregon during the River Influence on Shelf Ecosystems (RISE) cruise of May/June 2006. Dissolved and particulate aluminum (Al) concentrations were significantly greater in the river than in the coastal waters that mixed to form the plume. Dissolved Al concentrations in the Columbia River (∼80 nM) were low relative to other major rivers. Leachable and total particulate Al concentrations within the river reached concentrations greater than 1000 nM and 18,000 nM, respectively. Dissolved Al within the Columbia River estuary showed a significant removal (∼60%) at salinities between 0 and 10 with salt-induced flocculation of colloidal Al complexes and enhanced particle scavenging being probable explanations for aluminum removal. Dissolved and particulate Al concentrations were significantly greater in near-field plumes relative to surrounding coastal waters. As the plume advected from near-field to far-field away from the river mouth, dilution of the plume with lower dissolved Al surface waters as well as particle scavenging along the flow path appeared to be controlling dissolved Al distributions. Particle settling as well as dilution with lower particle-load waters led to observed decreases in particulate Al as the plume moved from near-field to far-field. However, the percent-leachable particulate aluminum in both near-field and far-field plumes was remarkably constant at ∼7%. Dissolved and particulate Al in a far-field plume over 100 km southwest of the Columbia River mouth were over an order-of-magnitude greater than surrounding waters, illustrating the importance of the Columbia River plume as a mechanism for transporting Al offshore. Aluminum could be used to trace the input of biologically-required elements such as iron into waters off the shelf. 相似文献
12.
浙江沿海海雾发生规律和成因浅析 总被引：4，自引：0，他引：4
分析了浙江沿海海雾的时间分布和地理分布的规律及其成因,结果如下:浙江沿海海雾时间分布集中在3～6月,这种时间分布主要受海气温度、湿度及季风等的影响;浙江沿海海雾的地理分布集中在嵊泗至坎门一带,这种地理分布与浙江近海的海流分布有密切关系。另外,当大气环流和水温出现异常时,浙江沿海海雾也会有异常表现。 相似文献
13.
14.
Masashi Kusakabe Andrey Andreev Vyacheslav Lobanov Igor Zhabin Yuichiro Kumamoto Akihiro Murata 《Journal of Oceanography》2002,58(5):691-701
Data from the R/V Mirai cruise (May–June 2000) have been examined to discover how mesoscale processes associated with eddy dynamics direct affect
the water masses, the distributions and the vertical fluxes of the dissolved oxygen, nutrients and dissolved inorganic carbon
in the western subarctic Pacific. Using maps of the temperature, salinity, dissolved oxygen, nutrients, chlorophyll and sea-air
pCO2 difference we show that the boundaries of the anticyclone eddies in the study region were composed of high productivity coastal
Oyashio water. The coastal waters were wrapped around the anticyclone eddies (thus creating a high productivity belt) and
intruded inside of them. Using SeaWifs data we demonstrate that temporal variations in the position and the strength of anticyclone
eddies advected the Kuril island coastal high productivity waters to the pelagic part, resulting in temporal variations of
the chlorophyll in the Oyashio region. Computed vertical fluxes of the dissolved oxygen (DO), inorganic carbon (DIC) and silicate
show that the anticylonic eddies in the Kuroshio-Oyashio Zone are characterized by enhanced vertical fluxes of the DO and
DIC between the upper (σθ = 26.7–27.0) and lower (σθ = 27.1–27.5) intermediate layer, probably due to the intrusions of the Oyashio waters into the eddies.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
15.
《Deep Sea Research Part II: Topical Studies in Oceanography》2009,56(16):1004-1020
Three sections are used to analyze the physical and chemical characteristics of the water masses in the eastern South Pacific and their distributions. Oceanographic data were taken from the SCORPIO (May–June 1967), PIQUERO (May–June 1969), and KRILL (June 1974) cruises. Vertical sections of temperature, salinity, σθ, dissolved oxygen, nitrate, nitrite, phosphate, and silicate were used to analyze the water column structure. Five water masses were identified in the zone through T–S diagrams: Subantarctic Water, Subtropical Water, Equatorial Subsurface Water, Antarctic Intermediate Water, and Pacific Deep Water. Their proportions in the sea water mixture are calculated using the mixing triangle method. Vertical sections were used to describe the geographical distributions of the water mass cores in the upper 1500 m. Several characteristic oceanographic features in the study area were analyzed: the shallow salinity minimum displacement towards the equator, the equatorial subsurface salinity maximum associated with a dissolved oxygen minimum zone and a high nutrient content displacement towards the south, and the equatorward intermediate Antarctic salinity minimum associated with a dissolved oxygen maximum. The nitrate deficit generated in the denitrification area off Peru and northern Chile is proposed as a conservative chemical tracer for the Equatorial Subsurface Waters off the coast of Chile, south of 25°S. 相似文献
16.
根据１９８８年夏季台湾海峡海域的调查资料讨论福建北部沿岸和台湾北面海域水化学的区域性特征。结果表明，福建沿岸上升流是西部海域诸化学要素分布的控制因素。台湾北面海域（２５°５０′－２６°４０′Ｎ，１２１°４５′－１２２°３０′Ｅ）水体下层出现局部冷水抬升，福建沿岸和台湾北面海域都具有低溶解氧且不饱和、高营养盐、低温、高盐的特征，溶解氧、诸营养盐与温度、盐度分别有良好的相关关系。 相似文献
17.
During the first year of the Northeast Pacific GLOBEC program we examined the spatial distributions of dissolved and particulate organic carbon and nitrogen in the surface waters off the Oregon and Washington coasts of North America. Eleven east–west transects were sampled from nearshore waters to 190 km offshore. Hydrographic data and the distribution of inorganic nutrients were used to characterize three distinct water sources: oligotrophic offshore water, the Columbia River plume, and the coastal upwelling region inshore of the California Current. Warm, high salinity offshore water had very low levels of inorganic nutrients, particulate organic carbon (POC) and dissolved organic carbon (DOC). Warm, low salinity water in the Columbia River plume was relatively low in nitrate, but showed a strong negative correlation between salinity and silicate. The river plume water had the highest levels of total organic carbon (TOC) (up to 180 μM) and DOC (up to 150 μM) observed anywhere in the sampling area. Cold, high salinity coastal waters had high nutrient levels, moderate to high levels of POC and particulate organic nitrogen (PON), and low to moderate levels of DOC and dissolved organic nitrogen (DON). Each of these regions has characteristic C:N ratios for particulate and dissolved organic material. The results are compared to concentrations and partitioning of particulate and dissolved organic carbon and nitrogen in other regions of the North Pacific and North Atlantic Oceans. 相似文献
18.
广西近海营养盐的时空分布特征 总被引：2，自引：1，他引：1
利用2006～2007年4个航次的大面调查数据,分析讨论了广西近海4个季节营养盐的时空分布变化特征。结果表明,该海域在春、夏、秋三季,活性硅酸盐和溶解无机氮分布趋势是近岸高,远岸低,由北向南呈梯度快速递减,高值区主要出现在廉州湾、铁山港和茅尾海三个区域;夏季磷酸盐在雷州半岛与涠洲岛之间出现高值;冬季3类营养盐在调查海区内分布均匀且为一年最低值。对该海区营养盐结构分析表明,硅在该海区过剩,溶解无机氮基本能满足浮游植物的生长需要,但在春季溶解无机氮和磷浓度都较低,属于寡营养型;夏季该海区磷浓度充足,在秋冬两季磷为该海区的限制性元素。 相似文献
19.
Abigail Parcasio Cid Syouhei Urushihara Tomoharu Minami Kazuhiro Norisuye Yoshiki Sohrin 《Journal of Oceanography》2011,67(6):747-764
The distribution of Al, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb in seawater was investigated on the Bering Sea shelf (56–64°N,
165–169°W) in September 2000. The unfiltered and filtered seawater samples were used for determination of total dissolvable
(TD) and dissolved (D) metals (M), respectively. The TD-M concentrations were generally higher than in the Pacific Ocean.
TD-Cd was highest in deep water of the outer shelf domain and dominated by dissolved species. The other TD-M were highest
at stations close to the Yukon River delta and had higher fractions of labile particulate (LP) species that were obtained
as the difference between TD-M and D-M. Dissolved Al, Ni, and Cu were characterized by input from the Yukon River. Dissolved
Mn and Co showed maximums on the bottom of the coastal domain, suggesting influence of sedimentary Mn reduction. The correlations
of D-Zn, D-Cd, and macronutrients indicated their distributions were largely controlled through uptake by microorganisms and
remineralization from settling particles. All these three processes (river input, sedimentary reduction, and biogeochemical
cycle) had an influence on the distribution of D-Fe. D-Pb was fairly uniformly distributed in the study area. The stoichiometry
of D-M in the Bering Sea shelf showed enrichment of Co and Pb and depletion of Ni, Cu, Zn, and Cd compared with that in the
North Pacific. The LP-M/LP-Al ratio revealed significant enrichment of the other eight metals relative to their crustal abundance,
suggesting importance of formation of Fe–Mn oxides and adsorption of trace metals on the oxides. 相似文献