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Registros recuperados: 19
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Antarctic pack ice algal distribution: Floe-scale spatial variability and predictability from physical parameters ArchiMer
Meiners, K. M.; Arndt, S.; Bestley, S.; Krumpen, T.; Ricker, Robert; Milnes, M.; Newbery, K.; Freier, U.; Jarman, S.; King, R.; Proud, R.; Kawaguchi, S.; Meyer, B..
Antarctic pack ice serves as habitat for microalgae which contribute to Southern Ocean primary production and serve as important food source for pelagic herbivores. Ice algal biomass is highly patchy and remains severely undersampled by classical methods such as spatially restricted ice coring surveys. Here we provide an unprecedented view of ice algal biomass distribution, mapped (as chlorophyll a) in a 100 m by 100 m area of a Weddell Sea pack ice floe, using under-ice irradiance measurements taken with an instrumented remotely operated vehicle. We identified significant correlations (p < 0.001) between algal biomass and concomitant in situ surface measurements of snow depth, ice thickness, and estimated sea ice freeboard levels using a statistical...
Tipo: Text Palavras-chave: Sea ice properties; Snow; Freeboard; Chlorophyll a; Ice algae; Biomass.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00398/50957/51721.pdf
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Apports des données de la 'couleur de l'eau' à la modélisation couplée physique-biogéochimie en milieu dynamique côtier : Application au Rio de la Plata et au Golfe de Gascogne ArchiMer
Huret, Martin.
Continental margins play a crucial role in biogeochemical fluxes between the continents and the open ocean. They are also highly sensitive to human perturbations. Primary production is highly dependent on the complex dynamics of these coastal zones, and on the river supply in nutrients, as well as in Suspended Particulate Matter (SPM) which limit light availability. The quantification of the production is a prerequisite in many applications, from the understanding of the role of the coastal ocean in climate change, to eutrophication and fisheries resources issues within the frame of the integrated management of the coastal zone. Coupled physical-biogeochemical models are useful in studying and monitoring primary production. Because of the numerous complex...
Tipo: Text Palavras-chave: Parameter estimation; Data assimilation; Suspended Particulate Matter (SPM); Chlorophyll a; Phytoplankton blooms; Physical biogeochemical coupled model; Ocean color; Satellite data; Coastal area; Bay of Biscay; Rio de la Plata; Estimation de paramètres; Assimilation de données; Matières En Suspension (MES); Chlorophylle a; Blooms phytoplanctoniques; Modèle couplé physique biogéochimie; Couleur de l'eau; Donnée satellitale; Milieu côtier; Golfe de Gascogne; Rio de la Plata.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/these-337.pdf
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Biological productivity enhancement over a continental shelf break (Bay of Biscay, NE Atlantic) evidenced by mesozooplankton aspartate transcarbamylase activity ArchiMer
Bergeron, Jean-pierre; Koueta, Noussithe.
During spring of 2005, satellite imagery revealed high sea surface chlorophyll a concentrations over the edge of a wide continental shelf in the Bay of Biscay (NE Atlantic). As a descriptor of biological productivity, mesozooplankton aspartate transcarbamylase specific activity was measured in situ during the bloom. Notably high values were detected in the bloom area relative to other parts of the study area.
Tipo: Text Palavras-chave: Aspartate transcarbamylase; Chlorophyll a; Mesozooplankton; Satellite imagery; Continental shelf break; Bay of Biscay.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00033/14474/11772.pdf
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Characterization of phytoplankton biodiversity in tropical shipwrecks off the coast of Pernambuco, Brazil Acta Botanica
Santos,Douglas Henrique Cavalcanti dos; Silva-Cunha,Maria da Glória Gonçalves; Santiago,Marilene Felipe; Passavante,José Zanon de Oliveira.
The phytoplankton community was studied around two artificial reefs (shipwrecks Servemar-X and Servemar-I), located off the coast of Pernambuco, northeastern Brazil, aiming to identify and thus, better describe these environments. Water samples were collected with Nansen bottle at three depths (surface, mid-column and bottom) for chlorophyll a analysis and salinity; temperature and water transparency were also measured. To collect phytoplankton samples, a diver using SCUBA equipment carried out phytoplankton hauls with a 20 µm net around the shipwrecks, about 1.5 m from the bottom for approximatly 3 minutes. Chlorophyll a concentrations at the bottom varied between 0.61 and 5.97 mg.m-3, with an average that indicates a mesotrophic environment. Temperature...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophyll a; Artificial reef; Trichodesmium; Diving.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000400007
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Chlorophyll a spatial inference using artificial neural network from multispectral images and in situ measurements Anais da ABC (AABC)
FERREIRA,MONIQUE S.; GALO,MARIA DE LOURDES B.T..
Considering the importance of monitoring the water quality parameters, remote sensing is a practicable alternative to limnological variables detection, which interacts with electromagnetic radiation, called optically active components (OAC). Among these, the phytoplankton pigment chlorophyll a is the most representative pigment of photosynthetic activity in all classes of algae. In this sense, this work aims to develop a method of spatial inference of chlorophyll a concentration using Artificial Neural Networks (ANN). To achieve this purpose, a multispectral image and fluorometric measurements were used as input data. The multispectral image was processed and the net training and validation dataset were carefully chosen. From this, the neural net...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Remote sensing of water; Fluorescence; Chlorophyll a; Spatial inference; Artificial neural network.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200519
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Dynamics of spatial patterns of microphytobenthic biomass: inferences from a geostatistical analysis of two comprehensive surveys in Marennes-Oleron bay (France) ArchiMer
Guarini, Jean-marc; Blanchard, Fabian; Bacher, Cedric; Gros, Philippe; Riera, P; Richard, P; Gouleau, D; Galois, R; Prou, Jean; Sauriau, Pg.
Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chi a m(-2)) than in January (ca 85 mg chi a m(-2)). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account or this result, we suggest that...
Tipo: Text Palavras-chave: Microphytobenthos; Chlorophyll a; Spatial distribution; Geostatistics; Intertidal mudflat.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00447/55852/58117.pdf
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Dynamique du carbone et des nutriments dans la zone côtière Baie de l’Aiguillon-Pertuis Breton et influence des apports terrestres du bassin versant du Marais poitevin ArchiMer
Lannuzel, Reva.
Coastal zones represent key systems in biogeochemical cycle couplings between continents, oceans and the atmosphere transporting considerable amounts of matter, energy and nutrients (C, N, P et Si) from land to sea. Despite its relatively modest surface area (7 % of the global ocean surface), this zone accounts for 14–30 % of all oceanic primary production. The present study deals with nutrients and carbon dynamics during a full hydrologic cycle in 2017 over the terrestrial-aquatic continuum formed by the Poitevin Marsh-Aiguillon Bay- Breton Sound to better understand terrestrial export influence on the coastal zone. Carbon and nutrient concentrations were sampled twice a month over heterogeneous sites (estuaries, channels and coastal sites) to integrate...
Tipo: Text Palavras-chave: Zone côtière; Biogéochimie; Carbone; Nutriments; Chlorophylle a; Limitation potentielle et réelle; Dynamique.; Coastal zone; Biogeochemistry; Carbon; Nutrients; Chlorophyll a; Real and potential limitation; Spatio-temporal dynamic..
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00445/55647/57299.pdf
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EFFECTIVENESS OF DIQUAT, BOTH ISOLATED AND ASSOCIATED WITH COPPER SOURCES IN CONTROLLING THE Hydrilla verticillata SUBMERGED MACROPHYTES AND ANKISTRODESMUS Gracilis microphyte Planta Daninha
MALASPINA,I.C.; CRUZ,C; GARLICH,N; BIANCO,S; PITELLI,R.A.
ABSTRACT The goal of this study was to evaluate the effectiveness of diquat, both isolated and associated with copper sources (oxychloride and hydroxide) in controling the H. verticillata submerged macrophyte and the A. gracilis microalgae. For this purpose, 10.0 cm H. verticillata young branches and 300 mL of A. gracilis culture were used. The experiments were performed in laboratory and the tested diquat concentrations were: 0.1; 0.2; 0.4; 0.8; 1.2; and 1.8 mg L-1, either isolated or added with 1.0% copper oxychlorideand hydroxide, as well as a control sample. On day 3, 7, 11, 21 and 30 after application, phytotoxicity signs were evaluated and on day 60 after application, green and dry biomass production and plant length were measured. To obtain dry...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chemical control; Water plant; Eutrophication; Phytotoxicity; Chlorophyll a.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100212
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Elevated CO2 concentration improves functional traits and early growth of the widespread species Enterolobium contortisiliquum (Vell.) Morong Biological Sciences
Melo, Nayara Magry Jesus; Rosa, Rayete Sary-Eldin Gil; Pereira, Eduardo Gusmão; Souza, João Paulo.
 Enterolobium contortisiliquum is a neotropical widespread species that occurs in native Atlantic Forest, Cerrado and Caatinga vegetation in Brazil. Outside Brazil, it occurs in Argentina, Bolivia, Paraguay, and Uruguay. The objective of this study was to investigate the influence of high carbon dioxide concentration [CO2] on leaf gas exchange, chlorophyll content, chlorophyll a fluorescence, growth, and biomass allocation among roots, stems, and leaves in young plants of E. contortisiliquum. After germination, twenty days old individuals of E. contortisiliquum were grown in open-top chambers (OTC) at two different [CO2] (400 ppm and 700 ppm). Physiological measurements were made when the plants had been grown in OTC for 170, 200, 230, and 260 days. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Botânica biomass partitioning; Chlorophyll a; Global climate change; Maximum net photosynthesis; Total leaf area..
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/39555
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Growth and biopigment accumulation of cyanobacterium Spirulina platensis at different light intensities and temperature BJM
Kumar,Manoj; Kulshreshtha,Jyoti; Singh,Gajendra Pal.
In order to find out optimum culture condition for algal growth, the effect of light irradiance and temperature on growth rate, biomass composition and pigment production of Spirulina platensis were studied in axenic batch cultures. Growth kinetics of cultures showed a wide range of temperature tolerance from 20 ºC to 40 ºC. Maximum growth rate, cell production with maximum accumulation of chlorophyll and phycobilliproteins were found at temperature 35 ºC and 2,000 lux light intensity. But with further increase in temperature and light intensity, reduction in growth rate was observed. Carotenoid content was found maximum at 3,500 lux. Improvement in the carotenoid content with increase in light intensity is an adaptive mechanism of cyanobacterium...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spirulina platensis; Growth kinetics; Chlorophyll a; Carotenoid; Phycobiliproteins.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300034
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Light absorbtion and maximum yield of photosynthesis during autumn phytoplankton bloom in the western Black Sea. IBSS Repository
Churilova, T. Ya.; Finenko, Z. Z.; Turgul, S..
In the frame of GEF/UNDP Black Sea Ecosystem Recovery Project the effect of nutrient availability on phytoplankton light absorption and maximum quantum yield of carbon fixation (фmax) has been investigated. It has been found out that chlorophyll a concentration (Chl a) varied from 0.3 to 10 mg m-3 increasing from deep-water region to shelf waters. At the shallow stations, where upper mixed layer spread deeper the bottom of euphotic zone, the homogenous pigment distribution was observed. In the deep-water region the Chl a profiles showed the presence of a deep Chl a maximum (DCM) below a seasonal density cline. The functional characteristics of phytoplankton showed depth-dependent variation. The phytoplankton from DCM was characterized 20 % lower values of...
Tipo: Journal Contribution Palavras-chave: Chlorophyll a; Phytoplankton; Light absorption; Maximum quantum yield; Nutrients; Хлорофилл a; Фитопланктон; Поглощение света; Максимальный квантовый выход; Биогенные элементы; Хлорофіл а; Фітопланктон; Поглинання світла; Максимальний квантовий вихід; Біогенні елементи.
Ano: 2008 URL: http://repository.ibss.org.ua/dspace/handle/99011/823
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Nitrogen fertilization to attenuate the damages caused by salinity on yellow passion fruit seedlings AGRIAMBI
Wanderley,José A. C.; Azevedo,Carlos A. V. de; Brito,Marcos E. B.; Cordão,Mailson A.; Lima,Robson F. de; Ferreira,Fagner N..
ABSTRACT The study aimed to evaluate the mitigating effect of nitrogen (N) on the damages caused by irrigation water salinity, in the production of yellow passion fruit seedlings. A randomized block design in split plots was used, with five levels of irrigation water salinity (plot) (0.3, 1.0, 1.7, 2.4 and 3.1 dS m-1) and five doses of N fertilization (sub-plot) (180, 240, 300, 360 and 420 mg of N dm-3), with five replicates, totaling 125 experimental units, with one plant per plot. The seedlings were produced in 3.780 mL tubes, used as drainage lysimeter, which received a daily irrigation depth based on water balance. Growth and contents of chlorophyll and carotenoids were evaluated at 85 days after sowing. The increase in irrigation water salinity...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Passiflora edulis f. flavicarpa; Chlorophyll a; Saline stress.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000800541
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The seasonal dynamics of nutrient and chlorophyll a concentrations on the SE Mediterranean shelf-slope ArchiMer
Herut, Barak; Almogi-labin, Ahuva; Jannink, Natasja; Gertman, Isaac.
We report the results of a sequence of twelve research cruises over a two-year period, from June 1996 through May 1998 that examined the seasonal variations in the nutrient (NO(3)(-) PO(4)(3-), and Si(OH)(4)) and in the chlorophyll a (Chl a) concentrations at two permanent stations across the SE Mediterranean continental shelf and slope (120 and 400 m water depth off the Israeli coast). Seasonally-dependent Chl a concentrations ranged between 0.003 and 0.415 mg m(-3). Following autumn and winter a distinct biomass phytoplankton peak was produced (similar to 30 mg Chl a m(-2) in the upper 120 m) and a subsequent moderate spring peak was observed. In the decomposition zone (120-400 m), an opposite pattern was observed with decreasing amounts of NO(3)(-) and...
Tipo: Text Palavras-chave: Nutriments; Méditerranée; Chlorophyll a; Oligothropie; Nutrients; Mediterranean; Chlorophyll alpha; Oligothropy.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43374/42837.pdf
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Вертикальное распределение флуоресценции хлорофилла в Чёрном море в тёплый период IBSS Repository
Кривенко, О. В..
На основе обобщения материалов шести экспедиций, выполненных в Чёрном море в летний и осенний периоды с 1991 по 2005 гг., проанализировано изменение вертикального распределения интенсивности флуоресценции хлорофилла (ИФ) в зависимости от гидрологических, гидродинамических и гидрохимических условий. Показано, что одномодальные профили ИФ доминируют в Чёрном море на протяжении всего тёплого периода. В 90% случаев максимум ИФ фиксируется в слое термоклина в среднем на глубине 22 ± 7 м. Пик ИФ залегает преимущественно на глубине максимального градиента плотности при величине последне- го ~ до 0.6 кг·м-3·м-1, а при его увеличении заглубляется на 5 – 7 м. Около 40 % всех профилей характеризуются высокими значениями ИФ и в ХПС. Показано, что полуширина максимума...
Tipo: Journal Contribution Palavras-chave: Чёрное море; Флуоресценция; Хлорофилл а; Нитраты; Чорне море; Флуоресценція; Хлорофіл а; Нітрати; Black Sea; Fluorescence; Chlorophyll a; Nitrate.
Ano: 2010 URL: http://repository.ibss.org.ua/dspace/handle/99011/1932
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Вертикальное распределение хлорофилла и флуоресценции в Черном море IBSS Repository
Финенко, З. З.; Чурилова, Т. Я.; Ли, Р. И..
На основании обобщения большого количества данных, полученных в результате исследований многих ав­торов, установлены временные и региональные изменения вертикального распределения концентрации хло­рофилла, флуоресценции. В холодный период (с декабря по март), когда вертикальное перемешивание по­верхностного слоя происходит достаточно активно, концентрация хлорофилла в глубоководных районах мо­ря распределена относительно равномерно в слое до 40 - 50 м. В теплый период (с мая по октябрь), после установления температурной стратификации в верхнем слое, преобладают профили с одним максимумом хлорофилла. Глубина расположения максимума хлорофилла меняется в широких пределах и зависит от его концентрации. Увеличение содержания хлорофилла в планктоне приводит к...
Tipo: Journal Contribution Palavras-chave: Черное море; Флуоресценция; Хлорофилл а; Фитопланктон; Биогенные вещества; Свет; The Black Sea; Chlorophyll a; Fluorescence; Phytoplankton; Nutrients; Irradiance Irradiance Nutrients (mineral) Phytoplankton Fluorescence Chlorophylls Fluorescence Phytoplankton Chlorophylls http://aims.fao.org/aos/agrovoc/c_10935 http://aims.fao.org/aos/agrovoc/c_13344 http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 2005 URL: http://repository.ibss.org.ua/dspace/handle/99011/189
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Отношение углерод/хлорофилл а как показатель возраста естественных популяций фитопланктона IBSS Repository
Чмыр, В. Д.; Сеничева, М. И..
The results of the regular measuring of main structural parameters of phytoplankton in near mouth waters of the Sevastopol Bay are presented: numbers, dimensional composition and biomasses of general its components, carbon and chlorophyll а contents. Analysis of relationship between some structural parameters, and also between them and environment conditions are carried out.
Tipo: Book Section Palavras-chave: Biomasses of phytoplankton; Chlorophyll a; Population.
Ano: 2010 URL: http://repository.ibss.org.ua/dspace/handle/99011/1843
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Региональный алгоритм расчёта концентрации хлорофилла а в Чёрном море по спутниковым данным SeaWiFS. IBSS Repository
Суслин, В. В.; Чурилова, Т. Я.; Сосик, Х. М..
Анализ стандартных спутниковых продуктов SeaWiFS второго уровня, характеризующих выходящее из-под поверхности воды излучение nLw(λ) в спектральных каналах (СК) λ = 490, 510 и 555 нм, показал, что их комбинация в виде индексов, определяемых как отношения I510 = nLw(555)/nLw(510) и I510 = nLw(510)/nLw(490), обладает в Чёрном море существенной нелинейностью в течение года. Эта особенность легла в основу метода разделения вкладов пигментов фитопланктона aph(λ) и суммы детрита и жёлтого вещества aCDM(λ) в поглощение света морской водой, и, как следствие, предложен региональный алгоритм определения концентрации хлорофилла а (Ca). Показано, что существуют, как минимум, два типа решений, соответствующих различному характеру поглощения света черноморской водой в...
Tipo: Journal Contribution Palavras-chave: Видимый диапазон; Дистанционное зондирование; Поглощение; Хлорофилл а; Окрашенное растворённое органическое вещество; Цианобактерии; SeaWiFS; Региональный алгоритм; Чёрное море; Visible domain; Remote sensing; Absorption; Chlorophyll a; Colored dissolved organic matter; Cyanobacteria; Regional algorithm; Black Sea; Видимий діапазон; Дистанційне зондування; Поглинання; Хлорофіл а; Забарвлена розчинена органічна речовина; Ціанобактерії; Регіональний алгоритм; Чорне море.
Ano: 2008 URL: http://repository.ibss.org.ua/dspace/handle/99011/808
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Сезонная изменчивость скорости роста фитопланктона в прибрежных водах Чёрного моря (район Севастополя). IBSS Repository
Стельмах, Л. В.; Куфтаркова, Е. А.; Бабич, И. И..
На основе данных, полученных на трёх станциях в прибрежных поверхностных водах Чёрного моря (в районе Севастополя) в 2006 – 2007 гг., представлена сезонная динамика удельной скорости роста фитопланктонного сообщества. В течение года этот показатель изменялся приблизительно на порядок. Максимальные значения (2.00 – 2.70 сутки-1) наблюдались в периоды весеннего и осеннего «цветения» воды, вызванного диатомовой водорослью Chaetoceros socialis. Минимальные величины (0.06 – 0.10 сутки-1) отмечены зимой, когда в планктоне доминировали два вида диатомовых водорослей Sceletonema costatum и C. socialis. Получены количественные зависимости между концентрацией нитратов и кремния, с одной стороны, и удельной скоростью роста фитопланктона, с другой. Основным фактором,...
Tipo: Journal Contribution Palavras-chave: Фитопланктон; Скорость роста; Хлорофилл a; Биогенные вещества; Чёрное море; Phytoplankton; Growth rate; Chlorophyll a; Nutrients; Black Sea; Фітопланктон; Швидкість росту; Хлорофіл a; Біогенні сполуки; Чорне море.
Ano: 2009 URL: http://repository.ibss.org.ua/dspace/handle/99011/843
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Сравнение алгоритмов расчёта первичной продукции Чёрного моря по концентрации хлорофилла в поверхностном слое, интенсивности солнечной радиации и температуре IBSS Repository
Ковалёва, И. В..
Приведены результаты сравнения интегрированной по глубине суточной первичной продукции, рассчитанной с применением пяти моделей для Чёрного моря. Алгоритмы включали информацию о концентрации хлорофилла в поверхностном слое, интенсивности фотосинтетически активной радиации, температуре и глубине эвфотической зоны. Для анализа рассчитанных величин использованы три базы данных. Одна включала спутниковые данные, две других – данные, получены при измерениях продукции методом имитации световых условий в море и in situ. Результаты расчётов, полученные с применением пяти алгоритмов внутри каждой базы данных, сравнивались между собой и с экспериментальными данными. Анализ различающихся по структуре и сложности моделей приводит к относительно малым различиям...
Tipo: Journal Contribution Palavras-chave: Первичная продукция; Хлорофилл а; Интенсивность солнечной радиации; Чёрное море; Первинна продукція; Хлорофіл а; Інтенсивність сонячної радіації; Чорне море; Primary production; Chlorophyll a; Intensity of sun radiation; Black Sea.
Ano: 2010 URL: http://repository.ibss.org.ua/dspace/handle/99011/1936
Registros recuperados: 19
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