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1.
三门湾秋季浮游植物现存量和初级生产力 总被引：3，自引：0，他引：3
对1987年9月浙江三门湾海区浮游植物细胞丰度、叶绿素a浓度和初级生产力的分布特征及其与环境的关系进行了研究。结果表明,调查海区的浮游植物细胞丰度、叶绿素a浓度和初级生产力均具有明显的空间区域性分布特征。叶绿素a浓度高值区位于三门湾顶部和健跳港口,从湾顶部往湾口海区方向,叶绿素a浓度逐渐下降。初级生产力的分布趋势与叶绿素a浓度的分布趋势一致。表层水浮游植物平均细胞丰度为(3.36±1.39)×103个/dm3,表、底层平均叶绿素a浓度分别为(1.47±0.42)μg/dm3和(1.12±0.19)μg/dm3,平均初级生产力为(36.0±29.5)mg/(m2·d)。 相似文献
2.
珠江口初级生产力和新生产力研究 总被引：18，自引：2，他引：18
1996年12月和1997年8月在珠江河口湾及其毗邻海域对浮游植物生物量、初级生产力和新生产力及其环境制约机制的研究.结果表明,调查海区的叶绿素a、初级生产力和新生产力均是夏季高于冬季,冬、夏两季的平均值分别为(0.95±0.41)和(1.08±0.52)μg/dm3,(69.2±75.5)和(198.7±119.1)mg/(m2·d),(1.46±0.79)和(3.05±3.09)mg/(m3·h).冬、夏两季平均f-比分别为0.45和0.38.分级叶绿素a结果显示,冬、夏两季均以微型和微微型级分(<20μm)占优势,其对海区叶绿素a的贡献分别为796%和81.6%,对初级生产力的贡献分别为70.7%和896%.调查海区具显著的空间区域化特征,叶绿素a和潜在初级生产力的高值出现在冲淡水区的中部,向口门区和远岸区逐渐降低.现场初级生产力的高值出现在远岸区,它与复合参数BeZpI0(Be为真光层平均叶绿素a,Zp为真光层深度,I0为海面光辐射强度-PAR)呈很好的正相关,说明光是研究海区初级生产力的主要限制因子.新生产力冬、夏两季的高值分别出现在交椅湾和伶仃洋西南部. 相似文献
3.
北部湾浮游植物粒径分级叶绿素a和初级生产力的分布特征 总被引：19，自引：4，他引：19
1994年5月23B至6月4日现场观测了北部湾浮游植物细胞丰度、叶绿素a浓度和初级生产力的分布.测区平均叶绿素a浓度为0.94±0.45/d3.平均初级生产力(C)为351±172mg/(m2·d),浮游植物细胞丰度为0.97×104-10050×104个/m3,鉴定浮游植物4门56属176种.地理环境和水文状况的差异使上述参数分布具有明显的区域性特征,近岸区高于湾中部,测区北部高干南部;温跃层以下水层叶绿素a浓度高于上层水,周6观测站平均叶绿素a浓度湾北部(0.47±0.15g/dm3)高于湾南部(0.15±0.02dm3).北部湾水域光合浮游生物以微型和微微型细胞(小于20m)占优势,其对总初级生产力的贡献(占91%)高于对总叶绿素a的贡献(占77%). 相似文献
4.
杭州湾——舟山渔场秋季浮游植物现存量和初级生产力 总被引：17，自引：5，他引：17
1995年9月在杭州湾和长江口至舟山海区进行了浮游植物细胞丰度、叶绿素a浓度和初级生产力的现场观测研究.结果表明,表层水浮游植物平均细胞丰度为(22.68±63.33)×104个/dm3;平均叶绿素a浓度为2.80±3.46μg/dm3,小于20μm的微型和微微型浮游生物细胞对叶绿素a的贡献占71%;平均初级生产力(C)为692.5±1192.4mg/(m2·d),小于20μm的微型和微微型浮游生物细胞对总生产力的贡献占68%.河口区悬浮物质浓度高,浮游植物光合作用受光的限制,各项生物参数与真光层深度紧密相关.生物锋区位于真光层深度10～20m、盐度26～32的长江冲淡水稀释区.同时探讨了浮游植物细胞活性(R)与光合作用同化数(AN)、叶绿素a与初级生产力、叶绿素a与海面光谱反射率的相互关系,为海洋水色遥感在初级生产力的应用研究提供科学依据 相似文献
5.
6.
南极普里兹湾浮游植物现存量与初级生产力粒级结构和新生产力研究 总被引：9，自引：4，他引：5
报道1998～1999年夏季在南极普里兹湾及其毗邻海域对细胞丰度、优势种类组成、生物量和初级生产力的粒级结构、新生产力及其环境制约机制的研究.结果表明,调查海区具有显著的空间区域化特征.普里兹湾及其毗邻陆架区浮游植物现存生物量和生产力均较高,大陆坡和深海区明显降低;营养盐浓度由于浮游植物的消耗则有相反的分布趋势.浮游植物生物量和生产力受水体的垂直稳定度、浮游动物摄食、水温和光照等环境条件的控制.粒度分级测定结果表明,对调查海区叶绿素a的贡献,小型浮游生物为52.2%,微型为29.4%,微微型为18.4%;对初级生产力的贡献,小型为52.4%,微型为28.7%,微微型为18.9%.研究海区的平均新生产力和f比分别为230.6mg/(m2·d)和0.43. 相似文献
7.
2012年楚科奇海及其邻近海域浮游植物现存量和初级生产力粒级结构研究 总被引：3，自引：1，他引：2
通过2012年夏季第五次北极科学考察期间在楚科奇海及其邻近海域现场调查所获得的数据分析研究了海域的粒度分级叶绿素a浓度和初级生产力。结果表明,叶绿素a浓度和初级生产力的高值均出现在楚科奇海陆架区,并且远高于深海区。去程时调查海域水层平均叶绿素a浓度的变化范围为0.32~15.66mg/m3,平均(2.77±3.96)mg/m3,高值区出现在南部邻近白令海峡海域、北部阿拉斯加巴罗近岸和冰缘区;初级生产力的范围为50.11~943.28mg/(m2d),高值出现在冰缘水华区。返程时水层平均叶绿素a浓度的变化范围为0.07~1.52mg/m3,平均(0.41±0.40)mg/m3,高值仍出现在陆架区,但比去程时低了一个数量级;初级生产力的分布范围为12.31~41.35mg/(m2d),高值出现在陆架区。浮游植物粒度分级测定结果表明,在生物量较低的深海区,叶绿素a浓度和初级生产力的粒级结构以微微型浮游生物(Pico级份)占优势(其贡献率分别为46.1%和56.9%),小型(Net级份)和微型(Nano级份)对总叶绿素a浓度的贡献差异极小,分别为26.6%和27.3%,对总初级生产力的贡献分别为23.8%和19.3%;而在生物量较高的水深小于200m的陆架区,Net级份叶绿素a浓度所占百分比最高,Pico级份次之,Nano级份最低,分别为59.8%、27.9%和12.3%,初级生产力的粒级结构中叶绿素a浓度所占百分比由高到低同样是Net、Pico和Nano,所占百分比分别为60.6%,32.2%和7.2%。 相似文献
8.
广东流沙湾叶绿素a含量和初级生产力状况的研究 总被引：1，自引：0，他引：1
对流沙湾叶绿素a含量和初级生产力周年调查结果表明, 流沙湾叶绿素a含量变化在0.09—25.35mg/m3之间, 平均2.91mg/m3。叶绿素a含量有明显的月变化, 各站位叶绿素a含量在3—5月份较低, 最高出现在8月份和11月份, 平均4.58mg/m3, 出现二个峰值。同一站位不同月份叶绿素a含量总体上差异显著(P<0.05)。流沙湾的初级生产力变化范围是6.89—1482.55mgC/(m2·d), 平均242.74mgC/(m2·d)。初级生产力不同月份存在着明显的差异, 其中, 11月份最高, 8月份和翌年1月份次之, 3—5月份初级生产力处于最低水平。流沙湾叶绿素a含量和初级生产力有明显的水平分布, 最高值出现在湾中央处的4号站和湾北部的5号站, 最低值出现在湾口西部的1号站和湾底南部的9号站, 各站位之间总体上差异显著(P<0.05)。 相似文献
9.
选取VGPM模式对南海北部海域初级生产力进行反演,通过SeaWiFS和AVHRR提供的Chl a,K490,PAR和SST等遥感数据产品计算得到了模式所需的各项参数,结合现场实测数据对模式进行了修订和误差分析.在此基础上通过反演计算获得了南海北部海域7 a平均(1998～2004年)初级生产力逐月分布图像.研究结果表明,研究海域初级生产力(C)分布趋势为由沿岸带向陆架以及外海逐渐降低,其中沿岸带区高于400 mg/(m2·d),外海区大致在100～300 mg/(m2·d);初级生产力水平冬季最高[平均为608 mg/(m2·d)]、夏季最低[平均为292 mg/(m2·d)],春、秋季基本持平.控制初级生产力时空分布的因子主要有营养盐、温度、光照,其中又以季风和环流驱动下的营养盐变化对初级生产力的调控最为显著. 相似文献
10.
杭州湾——舟山渔场秋季浮游植物现存量和初级生产力 总被引：8，自引：0，他引：8
1995年 9月在杭州湾和长江口至舟山海区进行了浮游植物细胞丰度、叶绿素a浓度和初级生产力的现场观测研究 .结果表明 ,表层水浮游植物平均细胞丰度为(2 2 6 8± 6 3 33)× 1 0 4个 /dm3;平均叶绿素a浓度为 2 80± 3 46 μg/dm3,小于 2 0μm的微型和微微型浮游生物细胞对叶绿素a的贡献占 71 % ;平均初级生产力 (C)为6 92 5± 1 1 92 4mg/ (m2 ·d) ,小于 2 0 μm的微型和微微型浮游生物细胞对总生产力的贡献占 6 8% .河口区悬浮物质浓度高 ,浮游植物光合作用受光的限制 ,各项生物参数与真光层深度紧密相关 .生物锋区位于真光层深度 1 0～ 2 0m、盐度 2 6～ 32的长江冲淡水稀释区 .同时探讨了浮游植物细胞活性 (R)与光合作用同化数 (AN)、叶绿素a与初级生产力、叶绿素a与海面光谱反射率的相互关系 ,为海洋水色遥感在初级生产力的应用研究提供科学依据 相似文献
11.
INTRODUCTIONComparedwithotheroceansintheworld ,thereisrelativelyhigherlevelofnutrients (ni trate ,phosphate ,silicate)intheSouthernOcean .Butprimaryproductivitiesarelow ,andnewproductionisalsoonlyinthemiddlelevelthere .Itiscommonlyconsideredthatthelowerpro ductivitiesintheSouthernOceaniscausedbylowtemperature ,lowlight,lowstabilityofwa ter,scarcityoftraceelementsuchasironandgrazingbyzooplankton (Burkilletal.,1 995) ,etc.ThemostexistedstudiesconcentratedontheAtlanticSectoroftheSouthernO… 相似文献
12.
南极普里兹湾及其邻近海域水团研究 总被引：3，自引：3，他引：0
普里兹湾及其邻近海域是中国南大洋调查研究的传统优势海域与重点区域。围绕夏季表层水、冬季水、陆架水、绕极深层水、南极底层水、普里兹湾底层水、冰架水等研究海区主要水团的特征和分布,总结了前人在南极普里兹湾及其邻近海域基于调查资料开展的水团研究中所取得的成果。研究表明,前人在对陆架水的示性指标界定上,将陆架水是否区分为高盐陆架水和低盐陆架水存在较大争议,在高盐陆架水和普里兹湾底层水的定义上存在重叠;目前尚没有证据表明绕极深层水向南可以伸展到普里兹湾的陆架区域,也没有发现在普里兹湾附近海域生成南极底层水的直接证据。 相似文献
13.
2000年夏季南极普里兹湾及邻近海域浮游植物研究 总被引：3，自引：2，他引：3
报道了2000年夏季(1月)在62°~69°S,70°30'~75°30'E的南极普里兹湾邻近海域浮游植物种类组成、丰度分布、叶绿素a浓度及其环境调控.结果表明,调查海区共有浮游植物4门33属65种、变种和变型.浮游植物平均细胞丰度为32.67×103个/dm3.浮游植物细胞丰度和叶绿素a浓度高值均出现在水体较稳定的近岸海湾和冰间湖及毗邻陆架,在大陆坡和深海区它们的值明显减小.浮游植物细胞丰度和叶绿素a浓度在0~50m水层最大,100m以下水层随深度的增加而减小.浮游植物丰度呈昼夜变化,在13:00丰度最高.浮游植物优势种为短菱形藻(Nitzschiacurta),占总丰度的24.8%.浮游植物种类组成和细胞丰度与浮冰和水团稳定性有关.经回归分析,浮游植物细胞丰度与水温、溶解氧成显著正相关,与无机磷(PO43--P)和无机氮(NO3--N)成显著负相关. 相似文献
14.
B. Kuvaas Y. Kristoffersen J. Guseva G. Leitchenkov V. Gandjukhin G. Kudryavtsev 《Marine Geophysical Researches》2004,25(3-4):247-263
Multichannel seismic reflection data from the Cosmonaut Sea margin of East Antarctica have been interpreted in terms of depositional
processes in the continental slope and rise area. A major sediment lens is present below the upper continental rise along
the entire Cosmonaut Sea margin. The lens probably consists of sediments supplied from the shelf and slope, being constantly
reworked by westward flowing bottom currents, which redeposited the sediments into a large scale drift deposit prior to the
main glaciogenic input along the margin. High-relief semicircular or elongated depositional structures are also found on the
upper continental rise stratigraphically above the regional sediment lens, and were deposited by the combined influence of
downslope and alongslope sediment transport. On the lower continental rise, large-scale sediment bodies extend perpendicular
to the continental margin and were deposited as a result of downslope turbidity transport and westward flowing bottom currents
after initiation of glacigenic input to the slope and rise. We compare the seismostratigraphic signatures along the continental
margin segments of the adjacent Riiser Larsen Sea, the Weddell Sea and the Prydz Bay/Cooperation Sea, focussing on indications
that may be interpreted as a preglacial-glaciomarine transition in the depositional environment. We suggest that earliest
glaciogenic input to the continental slope and rise occurred in the Prydz Bay and possibly in the Weddell Sea. At a later
stage, an intensification of the oceanic circulation pattern occurred, resulting in the deposition of the regional plastered
drift deposit along the Cosmonaut Sea margin, as well as the initiation of large drift deposits in the Cooperation Sea. At
an even later stage, possibly in the middle Miocene, glacial advances across the continental shelf were initiated along the
Cosmonaut Sea and the Riiser Larsen Sea continental margins. 相似文献
15.
The role of the small-size (SF; 0.1–0.5 mm) and large-size (LF; 0.5–20.0 mm) fractions in the biomass and abundance of mesozooplankton
(0.1–20.0 mm) was assessed using the database of samples obtained during the cruises of RV Akvanavt in the northeastern Black Sea in November 2000 and October 2006. The mesozooplankton was collected by means of Juday nets
(37/50, filtering gauze 160 μm) and Niskin bottles in two areas: (1) the shelf and continental slope (30–1480 m depth) and
(2) the deep sea (depths of more than 1500 m). The plankton net was considerably less effective in collecting the SF of the
mesozooplankton (by a factor of 30–36) than the Niskin bottles. When comparing the SF and LF, we estimated the abundance and
biomass of the SF in the samples obtained with the Niskin bottles. The abundance of the SF in the deep-sea area was 2.5 times
lower compared to the shelf and continental slope, and the LF abundance was 5.0 times lower in the same way. The abundance
of the SF constituted 88% of the total mesozooplankton on the shelf and continental slope, and 78% in the deep-sea area. The
biomass of the SF was higher as well on the shelf and continental slope. Meroplankton played a significant role in the SF
zooplankton abundance (0.5 × 103 + 0.16 ind. m−3) in this area. The SF grazing impact was 10% of the total mesozooplankton grazing on the shelf and continental slope, and
17% in the deepsea area. Appendicularia and nauplii of copepods had the greatest contribution to the mesozooplankton grazing
among the SF group. 相似文献
16.
INTRODUCTIONDissolvedorganiccarbon (DOC)makesupthesecondlargestofthebioactivepoolsofcar bonintheocean ,secondtothelargestpoolofdissolvedinorganiccarbon .Theglobaldissolvedorganiccarbonpoolisestimatedtobe 6 85Gt,avaluecomparabletothemassofCO2 intheat mosphere (Hedges,1 992 ) .Thesizeofthereservoir,aswellasitsdynamics ,indicatesthatDOCplaysacentralroleintheoceancarboncycle .AsitrelatestogreenhousegasessuchasCO2 andassociatesclimatecycle ,oceanicDOCbiogeochemicalcycleshavebeenoneoftheh… 相似文献
17.
The results of a single channel seismic reflection survey and of a micropaleontological examination of diatom remains in bottom sediment samples on the shelf and continental slope of the Peter the Great Bay area are presented. The composition and age of the sedimentary layer were studied using integrated seismic, micropaleontological and geological data. The continental slope was formed not later than at the beginning of the Early Miocene. The slope is covered with Middle Miocene-Pliocene sediments. The sedimentary thickness on most of the slope is 0.2–0.4 s. The maximum thickness (0.8–1.0 s) is observed within the areas of submarine canyons and valleys. The thickness of the Early Miocene-Pliocene sediments on the shelf is 0.2–0.4 s. On the shelf break and in a southwest-trending trough of the acoustic basement, it increases up to 1.0 s. Two uncomformities were identified in the sediments of the shelf area. The proposed age of the upper uncomformity is 10.0–8.5 My B.P.; it represents the result of a global sea level fall. The age of the lower uncomformity is unknown. 相似文献
18.
Takashi Yabuki Toshio Suga Kimio Hanawa Koji Matsuoka Hiroshi Kiwada Tomowo Watanabe 《Journal of Oceanography》2006,62(5):649-655
It has been inferred that the Prydz Bay region is one of the source regions of Antarctic Bottom Water (AABW) based on rather
indirect evidence. In order to examine this inference, we investigate the hydrographic condition of the bay based mainly on
XCTD data obtained during the Japanese Whale Research Program in the Antarctic (JARPA). The JARPA hydrographic data reveal
Circumpolar Deep Water (CDW), which is a salty, warm water mass approaching the shelf break, and capture Modified CDW (MCDW)
intruding into the shelf water. AABW production requires mixing of CDW and cold shelf water saltier than 34.6 psu, which is
a saltier type of Low Salinity Shelf Water (LSSW). Saltier LSSW is observed near the bottom over the shelf, being mixed with
MCDW. We further identify saltier LSSW near the shelf break. This saltier LSSW appears close enough to unmodified CDW to be
mixed with it over the continental slope, indicating a possible source of AABW in Prydz Bay. 相似文献
19.
In the summer seasons of 2004–2007, the intensive runoff (cascading) of the Antarctic shelf water (ASW) down the shelf and
continental slope was revealed thanks to the recording of numerous thermohaline profiles across the shelf and continental
slope of the Commonwealth Sea and Prydz Bay. The quickly executed profiles (4–10 h) with submesoscale resolution (near the
shelf’s edge, the scale was even eddy-determinative, i.e., within 1.9–5.6 km), in combination with the fine-structure sounding
and fine vertical resolution of the near-bottom boundary layer, provided a qualitatively new level of understanding the natural
data. The detailed analysis of the temperature, salinity, and density patterns revealed the regularities and peculiarities
of the ASW shelf and slope cascading. The intensive ASW cascading near the shelf break and lower part of the slope can be
forced (appearing as discrete frontal meanders) or free (appearing as discrete plumes) and often has a wave-eddy character.
The field observational data confirmed the obtained representative estimates of the elements of the ASW slope cascading. The
basic area of the ASW formation is near the Amery Shelf Ice, from where the ASW spreads to the northwest, goes around the
Fram Bank, and flows down the continental slope. The evaluative contribution of the ASW slope cascading to the ventilation
of the deep and slope water of the Southern Ocean (near the shelf break 70 km long where the ASW cascading was observed) is
Q
K
= 0.04–0.24 Sv, which agrees well with the analogous estimates obtained in other regions of the Antarctic. 相似文献