Consulta: subjectFacets:"Monsoon"
Registros recuperados: 11
Data/hora: 05/06/2024 02:48:24

Таксономический состав, численность и биомасса копепод в эпипелагиали Аравийского моря в периоды летнего и зимнего муссонов
Provedor de dados: 13
Autores: Прусова, И. Ю.; Смит, Ш. Л.
Анализируются таксономический состав, численность и биомасса копепод в эпипелагиали северо-западного и центрального регионов аравийского моря на основе зоопланктонных материалов, собранных в рамках программы US JGOFS на акватории между Оманом и Индией севернее 10° с.ш. в периоды летнего (август - сентябрь) и зимнего (декабрь) муссонов 1995 г. Идентифицировано 150 видов копепод. В периоды обоих муссонов по численности преобладали виды семейств Paracalanidae, Oncaeidae, Oithonidae, по биомассе - виды семейств Calanidae и Eucalanidae. Видовое разнообразие копепод было высоким на всей исследованной акватории в периоды обоих сезонов. В северо-западной части моря таксономическая структура копепод подвержена пространственно-временным изменениям, связанным с...
Tipo: Journal Contribution
Palavras-chave: Копеподы; Таксономический состав; Численность; Биомасса; Разнообразие; Апвеллинг; Муссон; Эпипелагиаль; Аравийское море; Copepods; Taxonomic composition; Number; Biomass; Dominance; Upwelling; Monsoon; Epipelagic realm; Arabian Sea Epipelagic zone Monsoons Upwelling Biomass Biomass http://aims.fao.org/aos/agrovoc/c_926.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/247

Seasonal cycle and interannual variability of rainfall at hydrological scales. The West African monsoon in a Sudanese climate
Provedor de dados: 5
Autores: Le Lay, Matthieu; Galle, Sylvie.
West African rainfall is characterized by a strong variability, both at decadal and interannual scales. In order to quantify the hydrological impacts of such a variability, analysis of rainfall patterns at fine scales is highly essential. This diagnostic study aims to characterize the Sudanese rainfall regime at hydrological scales, using a raingauge data set collected on the upper Oueme River catchment (Benin) between 1950 and 2002. A long-term drought is observed during the 1970s and 1980s, as in the Sahel. However, the interannual variability remains significant in the Sudanese region. The study of the seasonal cycle, based on the distinction between the oceanic and continental monsoon regimes, shows that the majority of rainfall changes occur in the...
Tipo: Text
Palavras-chave: Catchment; Sudanese climate; Rainfall deficit; Monsoon; Precipitation; West Africa.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/00203/31460/30115.pdf

Seasonal and intraseasonal biogeochemical variability in the thermocline ridge of the southern tropical Indian Ocean
Provedor de dados: 5
Autores: Resplandy, L.; Vialard, Jerome; Levy, M.; Aumont, Olivier; Dandonneau, Y.
The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) time series shows high variability of surface chlorophyll at seasonal and intraseasonal time scales in the oligotrophic southern tropical Indian Ocean thermocline ridge called the Seychelles-Chagos thermocline ridge (SCTR). The SCTR is characterized by an open ocean upwelling due to local Ekman pumping, which annually maintains the mixed layer (ML) shallow and is responsive to atmospheric forcing and in particular to the Madden-Julian Oscillation (MJO) at an intraseasonal time scale. Here we present an overview of SCTR biogeochemistry and investigate the physical processes driving the response observed at seasonal and intraseasonal time scales. Using satellite observations and biophysical ocean...
Tipo: Text
Palavras-chave: Madden julian oscillation; Arabian sea; Rossby waves; Interannual variability; Circulation model; Monsoon; Temperature; Perturbations; Nutrients; Dynamics.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00185/29630/27994.pdf

Width variation around submarine channel bends: Implications for sedimentation and channel evolution
Provedor de dados: 5
Autores: Palm, Franziska A.; Peakall, Jeff; Hodgson, David M.; Marsset, Tania; Silva Jacinto, Ricardo; Dennielou, Bernard; Babonneau, Nathalie; Wright, Tim J.
Submarine-fan channels can build the largest sediment accumulations on Earth, but our understanding of flow and sedimentation processes related to channel evolution remains limited. Results from physical and numerical modelling predict dominantly downstream channel bend migration. However, observations and evolutionary models for aggradational submarine channels on passive margins suggest that bends are dominated by lateral expansion. This paradox may be due to limitations induced by the use of constant width channels in process studies. Constant width has been used for two reasons: partly because this is the simplest possible case, but primarily because the width variation around submarine channel bends is unknown. Channel width variations are examined...
Tipo: Text
Palavras-chave: Submarine channel; Congo; Channel morphology; Sedimentation; Bank pull; Quaternary; Monsoon; South Atlantic.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00693/80473/83602.pdf

Interannual variability of the Tropical Indian Ocean mixed layer depth
Provedor de dados: 5
Autores: Keerthi, M. G.; Lengaigne, M.; Vialard, Jerome; De Boyer Montegut, Clement; Muraleedharan, P. M.
In the present study, interannual fluctuations of the mixed layer depth (MLD) in the tropical Indian Ocean are investigated from a long-term (1960-2007) eddy permitting numerical simulation and a new observational dataset built from hydrographic in situ data including Argo data (1969-2008). Both datasets show similar interannual variability patterns in relation with known climate modes and reasonable phase agreement in key regions. Due to the scarcity of the observational dataset, we then largely rely on the model to describe the interannual MLD variations in more detail. MLD interannual variability is two to four times smaller than the seasonal cycle. A large fraction of MLD interannual variations is linked to large-scale climate modes, with the exception...
Tipo: Text
Palavras-chave: Mixed layer; Interannual variability; Indian Ocean; Indian Ocean Dipole; El Nino/Southern Oscillation; Monsoon.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00124/23564/22771.pdf

A 5.3‐million‐year history of monsoonal precipitation in northwestern Australia
Provedor de dados: 5
Autores: Stuut, Jan‐berend W.; De Deckker, Patrick; Saavedra‐pellitero, Mariem; Bassinot, Franck; Drury, Anna‐joy; Walczak, Maureen H.; Nagashima, Kana; Murayama, Masafumi.
New proxy records from deep‐sea sediment cores from the northwestern continental margin of Western Australian reveal a 5.3 million‐year (Ma) history of aridity and tropical‐monsoon activity in northwestern Australia. Following the warm and dry early Pliocene (~5.3 Ma), the northwestern Australian continent experienced a gradual increase in humidity peaking at about 3.8 Ma with higher than present‐day rainfall. Between 3.8 and about 2.8 Ma, climate became progressively more arid with more rainfall variability. Coinciding with the onset of the northern hemisphere glaciations and the intensification of the northern hemisphere monsoon, aridity continued to increase overall from 2.8 Ma until today, with greater variance in precipitation and an increased...
Tipo: Text
Palavras-chave: Paleoclimate; Monsoon; Australia; Runoff; Pliocene; Quaternary.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00502/61384/65035.pdf

Hydrography and circulation of the Bay of Bengal during withdrawal phase of the southwest monsoon
Provedor de dados: 5
Autores: Sarma, Yvb; Rao, Epr; Saji, Pk; Sarma, Vvss.
Hydrographic data were collected from 3 to 10 September 1996 along two transects; one at 18 degrees N and the other at 90 degrees E. The data were used to examine the thermohaline, circulation and chemical properties of the Bay of Bengal during the withdrawal phase of the southwest monsoon. The surface salinity exhibited wide spatial variability with values as low as 25.78 at 18 degrees N / 87 degrees E and as high as 34.79 at 8 degrees N / 90 degrees E. Two high salinity cells (S &gt; 35.2) were noticed around 100 m depth along the 90 degrees E transect. The wide scatter in T-S values between 100 and 200 m depth was attributed to the presence of the Arabian Sea High Salinity (ASHS) water mass. Though the warm and low salinity conditions at the sea surface...
Tipo: Text
Palavras-chave: Hydrologie; Masse d'eau; Circulation; Mousson; Golfe du Bengale; Hydrography; Watermass; Circulation; Monsoon; Bay of Bengal.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43596/43927.pdf

Sea surface temperature, productivity, and terrestrial flux variations of the southeastern South China Sea over the past 800000 years (IMAGES MD972142)
Provedor de dados: 5
Autores: Shiau, Liang-jian; Yu, Pai-sen; Wei, Kuo-yen; Yamamoto, Masanobu; Lee, Teh-quei; Yu, Ein-fen; Fang, Tien-hsi; Chen, Min-te.
Variations in sea surface temperature (SST), productivity, and biogenic components such as total organic carbon (TOC), carbonate, and opal contents measured from IMAGES (International Marine Global Changes Study) core MD972142 provide information about long-term paleoceanographic changes during the past similar to 870000 years in the southeastern South China Sea (SCS). MD972142 U-37(k)-SSTs varied from 25 to 29 degrees C, paralleling the glacial to interglacial changes. MD972142 biogenic components show relatively high carbonate and opal, and low TOC contents in interglacial stages, and low carbonate and opal and high TOC contents in glacial stages, and these variations appear to be sensitive to regional terrestrial sediment input and productivity. Our...
Tipo: Text
Palavras-chave: Total organic carbon; Carbonate; Opal; Productivity; Sea surface temperature; South China Sea; Monsoon; IMAGES.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00237/34817/33682.pdf

Geochemical provenance of sediments from the northern East China Sea document a gradual migration of the Asian Monsoon belt over the past 400,000 years
Provedor de dados: 5
Autores: Beny, Francois; Toucanne, Samuel; Skonieczny, Charlotte; Bayon, Germain; Ziegler, Martin.
The reconstruction of the long-term evolution of the East Asian Monsoon remains controversial. In this study, we aim to give a new outlook on this evolution by studying a 400 kyr long sediment record (U1429) from the northern East China Sea recovered during IODP Expedition 346. Neodymium isotopic ratios and rare earth element concentrations of different grain-size fractions reveal significant provenance changes of the sediments in the East China Sea between East Asian continental sources (mainly Yellow River) and sediment contributions from the Japanese Archipelago. These provenance changes are interpreted as the direct impact of sea level changes, due to the reorganization of East Asian river mouth locations and ocean circulation on the East China Sea...
Tipo: Text
Palavras-chave: Monsoon; Eastern Asia; East China sea; Quaternary; Radiogenic isotopes; Neodymium; Rare earth elements.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00439/55088/56791.pdf

North Atlantic and Pacific Quasi‐Stationary Parts of Atmospheric Rivers and Their Implications for East Asian Monsoon Onset
Provedor de dados: 5
Autores: Lee, Hung‐i; Mitchell, Jonathan L.; Tripati, Aradhna; Lora, Juan M.; Chen, Ge; Ding, Qinghua.
Using a global space‐time diagram of column water vapor (CWV) at 30° N latitude from daily reanalysis data, we find two quasi‐stationary parts of atmospheric rivers (QSARs) that feature locally enhanced CWV and evolve from the Eastern Pacific/Atlantic basins in the winter to the Western Pacific/Atlantic in the summer. East Asian Summer Monsoon onset coincides with the time CWV in the Pacific QSAR first exceeds 40 mm, which also typically occurs just before it makes landfall. QSARs exist in 39‐year (1979–2017) daily climatological CWV, demonstrating the seasonal cycles of these features are quasi‐stationary and potentially useful for monsoon onset prediction. East Asian Summer Monsoon onset is particularly predictable following El Niño‐Southern Oscillation,...
Tipo: Text
Palavras-chave: Atmospheric rivers; Monsoon; Rossby wave breaking.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00592/70439/68539.pdf

Littoral Pycnogonida from the Socotra Archipelago
Provedor de dados: 16
Autores: Bartolino, V.; Krapp, F.
Nine pycnogonid species from four different families were collected. Propallene socotrana n. sp. and Anoplodactylus erythraeus n. sp. are described. Callipallene cf. dubiosa Hedgpeth, 1949 is fi gured and its systematic position discussed. The Pycnogonida fauna around the Socotra Archipelago (Yemen) supports the hypothesis the Socotra Archipelago represents an important transient zoogeographic region between the Red Sea and the Indian Ocean.
Tipo: Article / Letter to the editor
Palavras-chave: Monsoon; Taxonomy; 42.74.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/262645