Wyniki wyszukiwania

1

A verification of model of upwelling radiance above the sea surface

100%

Olszewski J.

Oceanologia

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1985

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tom 20

2

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Variability of currents over the southern slope of the Gulf of Finland

100%

Suhhova I., Pavelson J., Lagemaa P.

Oceanologia

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2015

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tom 57

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nr 2

3

Sea surface temperature distribution during upwelling along the Polish Baltic coast

100%

Krezel A., Ostrowski M., Szymelfenig M.

Oceanologia

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2005

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tom 47

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nr 4

Among over 150 maps of sea surface temperature in the Polish Baltic coastal region derived from satellite data during the warm period of the year (April–October) in 2000–2002, 41 cases were noted where its distribution showed characteristic features indicating the occurrence of coastal upwelling. The fundamental parameters of range, probability of occurrence and temperature modification caused by water from deeper sea layers raised by an upwelling event and spreading across the surface were established for three regions (Hel, Łeba and Kołobrzeg). The Kołobrzeg upwelling region had the largest spatial range (up to 5000 km2). The region with the smallest spatial range (Hel, up to 1400 km2) had the largest surface temperature amplitude (to 14◦C), the largest maximum temperature gradient (5◦C km−1) and the largest average sea surface temperature decrease in the centre in relation to the background value.

4

Spatio-temporal variations in hydro-physical and -chemical parameters during a major upwelling event off the Southern coast of the Gulf of Finland in summer 2006

100%

Suursaar U., Aps R.

Oceanologia

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2007

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tom 49

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nr 2

The objective of the paper is to document and examine the major upwelling event that occurred along the northern coast of Estonia in August 2006. With a horizontal extension of 360 km, the event was caused by persistent easterlies and was noticed by a large number of holidaymakers, as it reduced the temperature of the coastal sea to a chilly 5–10◦C for about a month. In situ measurements from an RDCP current profiler revealed an along-wind coastal jet of up to 60 cm s−1 and a weak near-bottom countercurrent. The depths of the pycnocline and nutricline rose. The maximum drop in water temperature was 16◦C, that of salinity was 3.6 PSU. Analysis of satellite images confirmed the large extension and the prominence of the event.

5

Coastal up- and downwelling in the Southern Baltic

100%

Kowalewski M., Ostrowski M.

Oceanologia

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2005

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tom 47

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nr 4

A three-dimensional hydrodynamic model was used to determine 12 zones of upand downwelling in the southern part of the Baltic Sea.O n the basis of a seven-year numerical simulation, the annual frequency of up- and downwelling events in various regions was analysed, their vertical velocity evaluated and the probability of their occurrence for different wind directions calculated.V erification of the model results demonstrated their good correspondence with satellite images, on average equal to 92%.The poorest consistency was recorded for upwelling in the Bornholm region (81%).The annual average frequency of strong upwelling (velocities > 10−4 m s−1) ranged from c.5–7% off the eastern coasts of the southern Baltic to > 31% along the north-eastern coast of Bornholm.A long the Polish coast (excepting the Vistula Spit) downwelling was recorded more frequently than upwelling.The frequency of strong vertical currents was highest in the area to the north of the Hel Peninsula, where high percentages of strong upwelling (27.1%) and downwelling (37.1%) were recorded.

6

Demonstration of a new indicator for studying upwelling in the Northern South China Sea

84%

Lin L., Wang Y.-S., Sun C.-C., Li N., Wang H., Mitchell B. G., Wu M.-L., Song H., Wu J.-F.

Oceanologia

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2011

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tom 53

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nr 2

In order to demonstrate that silicate (SiO3-Si) can be used as an indicator to study upwelling in the northern South China Sea, hierarchical cluster analysis (CA) and principle component analysis (PCA) were applied to analyse the metrics of the data consisting of 14 physical-chemical-biological parameters at 32 stations. CA categorized the 32 stations into two groups (low and high nutrient groups). PCA was applied to identify five Principal Components (PCs) explaining 78.65% of the total variance of the original data. PCA found important factors that can describe nutrient sources in estuarine, upwelling, and non-upwelling areas. PC4, representing the upwelling source, is strongly correlated to SiO3-Si. The spatial distribution of silicate from the surface to 200 m depth clearly showed the upwelling regions, which is also supported by satellite observations of sea surface temperature.

7

Spatio-temporal variations in sulfur-oxidizing and sulfate-reducing bacterial activities during upwelling, off South-West coast of India

84%

Kamaleson A. S., Gonsalves M.-J., Kumar S., Jineesh V. K., LokaBharathi P. A.

Oceanologia

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2019

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tom 61

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nr 4

8

Response of Eastern Indian Ocean (ODP Site 762B) benthic foraminiferal assemblages to the closure of the Indonesian seaway

84%

Rai A. K., Singh V. B.

Oceanologia

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2012

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tom 54

|

nr 3

9

Characterization of light absorption coefficient of red Noctiluca scintillans bloom in the South Eastern Arabian Sea

84%

Shaju S. S., Akula R. R., Jabir T.

Oceanologia

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2018

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tom 60

|

nr 3

10

Upwelling characteristics in the Puck Bay [the Baltic Sea]

84%

Nowacki J., Matciak M., Szymelfenig M., Kowalewski M.

Oceanological and Hydrobiological Studies

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2009

|

tom 38

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nr 2

3-16

11

Winter upwelling in the Gulf of Finland, Baltic Sea

84%

Suursaar U.

Oceanologia

|

2021

|

tom 63

|

nr 3

12

Spatio-temporal variation of microphytoplankton in the upwelling system of the South-Eastern Arabian Sea during the summer monsoon of 2009

84%

Thomas L. C., Padmakumar K. B., Smitha B. R., Asha Devi C. R., Nandan S. B., Sanjeevan V. N.

Oceanologia

|

2013

|

tom 55

|

nr 1

13

Synoptic conditions governing upwelling along the Polish Baltic coast

84%

Bednorz E., Polrolniczak M., Czarnecki B.

Oceanologia

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2013

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tom 55

|

nr 4

14

The influence of the Hel upwelling (Baltic Sea) on nutrient concentrations and primary production - the results of an ecohydrodynamic model

84%

Kowalewski M.

Oceanologia

|

2005

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tom 47

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nr 4

An ecohydrodynamic model was used to investigate the effect of the Hel upwelling on nutrient concentrations, primary production and phytoplankton biomass. The model covered the whole Baltic Sea with a 5 NM grid spacing and the Gulf of Gdańskwith a 1 NM grid spacing. Validation indicated good agreement between model results and measurements in the GdańskD eep, and slightly weaker concord for the Hel upwelling area. The vertical nutrient fluxes associated with up- and downwelling in the Hel region were simulated for two 30-day periods in 2000. The nutrient input resulting from long-term upwelling is comparable to the load carried into the Gulf of Gdańskb y the Vistula (Wisła), the largest river in the vicinity. Performed at times when upwelling was almost permanent, the simulations showed elevated nutrient concentrations in surface waters. This was especially distinct in spring when primary production and phytoplankton biomass were both higher. In late summer, however, upwelling caused primary production to decrease, despite the elevated nutrient levels.

15

Waves, currents and sea level variations along the Letipea - Sillamäe coastal section of the Southern Gulf of Finland

67%

Suursaar U.

Oceanologia

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2010

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tom 52

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nr 3

391-416

Variations in the hydrodynamic conditions were studied on the basis of 336 days of measurements with a Doppler current profiler. With wave data as a calibration reference, a semi-empirical hindcast of wave parameters is presented in the fetch- limited near-shore area for the period 1966–2008. A resultant 4–6 cm s−1 westward current dominated along the coast. Occasional fast sub-surface westward currents under modest wind forcing, as well as asymmetrical vertical profiles for westward and eastward currents indicated the influence of upwelling-related baroclinic coastal jets. The average frequency of upwelling was estimated at 17%; some of the events were identified in near-homothermic winter conditions on the basis of salinity and multi-layer flow records. While the mean sea level trend at Narva-Jõesuu roughly approximated the global estimates for 1899–2009, the annual maximum sea level increase was 5–8 mm yr−1. Both mean and maximum wave heights declined as a result of decreasing winds from the north.

16

Upwelling intrusion into shallow Puck Lagoon, a part of Puck Bay (the Baltic Sea)

67%

Matciak M., Nowacki J., Krzyminski W.

Oceanological and Hydrobiological Studies

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2011

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tom 40

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nr 2

17

Monitoring the effect of upwelling on the chlorophyll a distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data

67%

Uiboupin R., Laanemets J., Sipelgas L., Raag L., Lips I., Buhhalko N.

Oceanologia

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2012

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tom 54

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nr 3

The spatio-temporal variability of chlorophyl a (Chl a) caused by a sequence of upwelling events in the Gulf of Finland in July–August 2006 was studied using remote sensing data and field measurements. Spatial distributions of sea surface temperature (SST) and Chl a concentration were examined using MODIS and MERIS data respectively. The MERIS data were processed with an algorithm developed by the Free University of Berlin (FUB) for case 2 waters. Evaluation of MERIS Chl a versus in situ Chl a showed good correlation (r2 = 0.67), but the concentration was underestimated. The linear regression for a 2 h window was applied to calibrate MERIS Chl a. The spatio-temporal variability exhibited the clear influence of upwelling events and related filaments on Chl a distribution in the western and central Gulf. The lowest Chl a concentrations were recorded in the upwelled water, especially at the upwelling centres, and the highest concentrations (13 mg m−3) were observed about two weeks after the upwelling peak along the northern coast. The areas along the northern coast of upwelled water (4879 km2) on the SST map, and increased Chl a (5526 km2) two weeks later, were roughly coincident. The effect of upwelling events was weak in the eastern part of the Gulf, where Chl a concentration was relatively consistent throughout this period.

18

Simulation of nutrient transport from different depths during an upwelling event in the Gulf of Finland

67%

Vali G., Zhurbas V., Laanemets J., Elken J.

Oceanologia

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2011

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tom 53

|

nr (1-TI)

Numerical simulation experiments with a high-resolution circulation model were carried out to study nutrient transport from different depths to the surface 10-m layer during an upwelling event along the northern coast of the Gulf of Finland in July 1999. The initial nutrient distribution is based on field measurements performed in the north-western part of the Gulf. Wind forcing covering the period of the upwelling along the northern coast was turned through 180◦ to simulate an upwelling along the southern coast. The simulation results showed that the main phosphorus transport to the upper 10-m layer occurred from depths shallower than 30 m for the upwelling events along both the northern and the southern coasts. Nitrogen transport to the upper 10-m layer was the largest from depths of 40–55 m for the upwelling along the northern and 40–65 m for the upwelling along the southern coast. Simulated cumulative volume transports to the upper 10-m layer from different depths showed that the contribution from deeper layers was larger in the case of the upwelling along the southern coast. The reduction of wind stress had a bigger influence on water transport from the deeper layers.

Ograniczanie wyników

A verification of model of upwelling radiance above the sea surface

Variability of currents over the southern slope of the Gulf of Finland

Sea surface temperature distribution during upwelling along the Polish Baltic coast

Spatio-temporal variations in hydro-physical and -chemical parameters during a major upwelling event off the Southern coast of the Gulf of Finland in summer 2006

Coastal up- and downwelling in the Southern Baltic

Demonstration of a new indicator for studying upwelling in the Northern South China Sea

Spatio-temporal variations in sulfur-oxidizing and sulfate-reducing bacterial activities during upwelling, off South-West coast of India

Response of Eastern Indian Ocean (ODP Site 762B) benthic foraminiferal assemblages to the closure of the Indonesian seaway

Characterization of light absorption coefficient of red Noctiluca scintillans bloom in the South Eastern Arabian Sea

Upwelling characteristics in the Puck Bay [the Baltic Sea]

Winter upwelling in the Gulf of Finland, Baltic Sea

Spatio-temporal variation of microphytoplankton in the upwelling system of the South-Eastern Arabian Sea during the summer monsoon of 2009

Synoptic conditions governing upwelling along the Polish Baltic coast

The influence of the Hel upwelling (Baltic Sea) on nutrient concentrations and primary production - the results of an ecohydrodynamic model

Waves, currents and sea level variations along the Letipea - Sillamäe coastal section of the Southern Gulf of Finland

Upwelling intrusion into shallow Puck Lagoon, a part of Puck Bay (the Baltic Sea)

Monitoring the effect of upwelling on the chlorophyll a distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data

Simulation of nutrient transport from different depths during an upwelling event in the Gulf of Finland