Seagrass Bed Recovery after Hydrological Restoration in a Coastal Lagoon with Groundwater Discharges in the North of Yucatan (Southeastern Mexico)

A first-ever spatially detailed record of ice cover conditions in the Curonian Lagoon (CL), Europe’s largest coastal lagoon located in the southeastern Baltic Sea, is presented. The multi-mission synthetic aperture radar (SAR) measurements acquired in 2002–2017 by Envisat ASAR, RADARSAT-2, Sentinel-1 A/B, and supplemented by the cloud-free moderate imaging spectroradiometer (MODIS) data, are used to document the ice cover properties in the CL. As shown, satellite observations reveal a better performance over in situ records in defining the key stages of ice formation and decay in the CL. Using advantages of both data sources, an updated ice season duration (ISD) record is obtained to adequately describe the ice cover season in the CL. High-resolution ISD maps provide important spatial details of ice growth and decay in the CL. As found, ice cover resides longest in the south-eastern CL and along the eastern coast, including the Nemunas Delta, while the shortest ice season is observed in the northern CL. During the melting season, the ice melt pattern is clearly shaped by the direction of prevailing winds, and ice drift velocities obtained from a limited number of observations range within 0.03–0.14 m/s. The pronounced shortening of the ice season duration in the CL is observed at a rate of 1.6–2.3 days year‒1 during 2002–2017, which is much higher than reported for the nearby Baltic Sea regions. While the timing of the freeze onset and full freezing has not changed much, the dates of the final melt onset and last observation of ice have a clear decreasing pattern toward an earlier ice break-up and complete melt-off due to an increase of air temperature strongly linked to the North Atlantic Oscillation (NAO). Notably, the correlation between the ISD, air temperature, and winter NAO index is substantially higher when considering the lagoon-averaged ISD values derived from satellite observations compared to those derived from coastal records. The latter clearly demonstrated the richness of the satellite observations that should definitely be exploited in regional ice monitoring programs.

Download Full-text

THE DISTRIBUTION OF RECENT BENTHIC FORAMINIFERA IN THE ARAFURA SEA

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v2i2.7854 ◽

2010 ◽

Vol 2 (2) ◽

Cited By ~ 1

Author(s):

Suhartati M. Natsir ◽

Rubiman Rubiman

Keyword(s):

Benthic Foraminifera ◽

Common Species ◽

Current Speed ◽

North Coast ◽

Shallow Waters ◽

Sediment Type ◽

Seagrass Bed ◽

The North ◽

Arafura Sea ◽

High Level

Arafura Sea consists of shallow waters and located in the Southern of Papua to the north coast of Australia. The waters is vegetated by shallow-water ecosytems such as mangrove, seagrass bed, and coral reefs. The Arafura continental shelf is predominated by sediment from late Paleozoic, Mesozoic to Cenozoic and underlain by granitic basement. Foraminifera is a single cell microorgainsm, has pseudopodia with high level of diversity. Foraminifera dwells in every level of sea depth, from estuary to the deep sea. However, a certain species commonly dwells in the specific profundity. The aim of the study was to recognize the distribution of benthic foraminifera in the waters of Arafura Sea and it relation with the environmental characteristics. As many as 11 sediment samples was collected in May 2010 from the water of Arafura Sea using a box core with capcity of 0,3 m3. Laboratory analyses on the colleted samples were performed to determine the type of sediments and identify the benthic foraminifera, and to determine the abundance of each samples. The number of species found from the collected sediments were 37 species consisting of 29 genera of which most of them were member of Suborder Rotaliina and many of them belong to Suborder Miliolina and Textulariina. The most common species of the sampling sites were Ammonia beccarii and Pseudorotalia schroeteriana. The Arafura Sea commonly recognized as shallow waters, open seas, with current speed of midium to high. The predominant sediment type of the waters is sandy mud and little of clay.Keywords: distribution, benthic foraminifera, sediment and Arafura

Download Full-text

Observations of Turbulent Heat Fluxes Variability in a Semiarid Coastal Lagoon (Gulf of California)

Atmosphere ◽

10.3390/atmos11060626 ◽

2020 ◽

Vol 11 (6) ◽

pp. 626 ◽

Cited By ~ 1

Author(s):

Lidia Irene Benítez-Valenzuela ◽

Zulia Mayari Sanchez-Mejia

Keyword(s):

Coastal Lagoon ◽

Gulf Of California ◽

Monsoon Season ◽

Critical Role ◽

Turbulent Fluxes ◽

Heat Fluxes ◽

North American Monsoon ◽

Turbulent Heat ◽

The North ◽

Post Monsoon Season

Despite the critical role latent (LE) and sensible (H) heat play in turbulent processes and heat exchange in the water–air interface, there is a lack of studies of turbulent fluxes over the surface in semiarid regions. We collected continuous measurements of net radiation (Rn), LE, H, and micrometeorological data at a coastal lagoon in the Gulf of California during 2019 with an eddy covariance (EC) system. We analyzed the time series, considering the North American Monsoon System, the pre-monsoon, and post-monsoon season. Results show that Rn (276 ± 118 W m−2) and turbulent fluxes were higher during the monsoon season (July–September) LE (129 ± 18 W m−2), and H (29 ± 9 W m−2). The monthly average of Rn, LE, and H was highest in June (493.9 W m−2), August (142 W m−2), and May (50 W m−2), respectively. Furthermore, during the monsoon season, the (H + LE)/Rn ratio (0.74) suggests that more than half of the Rn reaching the coastal lagoon is used for the turbulent exchange of LE and H. During the pre-monsoon, LE (r2 = 0.36) increases with a higher vapor pressure deficit (VPD), while H (r2 = 0.66) increases with a higher friction velocity (u*) during the monsoon season. Quantitative observations are essential for further research.

Download Full-text

HYDROCARBONS DETECTION IN A COASTAL LAGOON IMPACTED BY AN OIL SPILL IN SÃO SEBASTIÃO CHANNEL, SÃO PAULO STATE, BRAZIL1

International Oil Spill Conference Proceedings ◽

10.7901/2169-3358-2005-1-777 ◽

2005 ◽

Vol 2005 (1) ◽

pp. 777-785

Author(s):

Maria Eulália Rocha Carneiro ◽

Rogério Migueis Picado ◽

Cinthia Masumoto ◽

Leonardo Mitidiero Mansor ◽

Märcia Caruso Bícego ◽

...

Keyword(s):

Coastal Lagoon ◽

Petroleum Hydrocarbons ◽

Monitoring Program ◽

Mussel Tissue ◽

Tissue Samples ◽

Total N ◽

Bulk Oil ◽

Lagoon Water ◽

The North ◽

Polycyclic Aromatic

ABSTRACT An operational problem involving the loading arms occurred at São Sebastião Oil Terminal of PETROBRAS, located in the Brazilian Southeastern coast, during the oil transference from the tanker to the Terminal, resulting in the spill of approximately 26.0 m3 of crude Marlin-33 oil on 3 June 2003. The spilled bulk oil was transported by wind-driven currents to the north of São Sebastião Channel where skimmer vessels and booms collected the product. In spite of all contingency actions, some of the oil reached a coastal lagoon. The Environmental Monitoring Program, involving sampling a week and four months after the event, included chemical analysis for benzene, toluene, ethybenzene and xylenes (BTEX), petroleum hydrocarbons (TPH), aliphatic compounds (n-alkanes), polycyclic aromatic compounds (PAH), unresolved complex mixtures (UCM) and total organic carbon (TOC); toxicological tests for water using the Microtox system and Lytechinus variegatus embryo test, and for sediment using the Nitokra copepod test; and hydrocarbon detection in mussel tissue, related to local aquaculture. The coastal water PAH concentrations after the spill ranged from 0.14 to 1.92 μg/L in chrysene equivalents. For the lagoon water analysis, the concentrations of PAHs ranged from 1.54 to 9.66 μg/L. The total PAH concentrations in lagoon sediment ranged from 5.6 to 359.2 ng/g with perilene prevalence. The total PAH concentrations in mussel tissue samples ranged below the detection limit to 110.0 ng/g; the aliphatic hydrocarbon concentrations varied between 11.02 to 21.36 μg/g and total n-alkanes between 4.80 to 6.21 μg/g, showing no influence of petroleum hydrocarbons. The toxicity results were not conclusive: by means of acute tests, no toxicity was observed in the lagoon water. However, the chronic tests indicated toxicity in some samples including in the controls located in non-affected places.

Download Full-text

Sedimentary record of coseismic subsidence in Hersek coastal lagoon (Izmit Bay, Turkey) and the late Holocene activity of the North Anatolian Fault

Geochemistry Geophysics Geosystems ◽

10.1029/2011gc003511 ◽

2011 ◽

Vol 12 (6) ◽

pp. n/a-n/a ◽

Cited By ~ 15

Author(s):

Sébastien Bertrand ◽

Lisa Doner ◽

Sena Akçer Ön ◽

Ummuhan Sancar ◽

Ulla Schudack ◽

...

Keyword(s):

Coastal Lagoon ◽

Late Holocene ◽

North Anatolian Fault ◽

Sedimentary Record ◽

Izmit Bay ◽

The North ◽

Holocene Activity ◽

Coseismic Subsidence

Download Full-text

THE DISTRIBUTION OF RECENT BENTHIC FORAMINIFERA IN THE ARAFURA SEA

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.28930/jitkt.v2i2.7854 ◽

2010 ◽

Vol 2 (2) ◽

Author(s):

Suhartati M. Natsir ◽

Rubiman Rubiman

Keyword(s):

Benthic Foraminifera ◽

Common Species ◽

Current Speed ◽

North Coast ◽

Shallow Waters ◽

Sediment Type ◽

Seagrass Bed ◽

The North ◽

Arafura Sea ◽

High Level

Arafura Sea consists of shallow waters and located in the Southern of Papua to the north coast of Australia. The waters is vegetated by shallow-water ecosytems such as mangrove, seagrass bed, and coral reefs. The Arafura continental shelf is predominated by sediment from late Paleozoic, Mesozoic to Cenozoic and underlain by granitic basement. Foraminifera is a single cell microorgainsm, has pseudopodia with high level of diversity. Foraminifera dwells in every level of sea depth, from estuary to the deep sea. However, a certain species commonly dwells in the specific profundity. The aim of the study was to recognize the distribution of benthic foraminifera in the waters of Arafura Sea and it relation with the environmental characteristics. As many as 11 sediment samples was collected in May 2010 from the water of Arafura Sea using a box core with capcity of 0,3 m3. Laboratory analyses on the colleted samples were performed to determine the type of sediments and identify the benthic foraminifera, and to determine the abundance of each samples. The number of species found from the collected sediments were 37 species consisting of 29 genera of which most of them were member of Suborder Rotaliina and many of them belong to Suborder Miliolina and Textulariina. The most common species of the sampling sites were Ammonia beccarii and Pseudorotalia schroeteriana. The Arafura Sea commonly recognized as shallow waters, open seas, with current speed of midium to high. The predominant sediment type of the waters is sandy mud and little of clay.Keywords: distribution, benthic foraminifera, sediment and Arafura

Download Full-text

Potensi Cadangan dan Serapan Karbon oleh Padang Lamun di bagian Utara dan Timur Pulau Bintan

Oseanologi dan Limnologi di Indonesia ◽

10.14203/oldi.2017.v2i3.158 ◽

2017 ◽

Vol 2 (3) ◽

pp. 35 ◽

Cited By ~ 3

Author(s):

Andri Irawan

Keyword(s):

Carbon Stock ◽

Seagrass Beds ◽

Seagrass Bed ◽

Eastern Side ◽

The North ◽

Storage Rate ◽

Northern Side ◽

Growth Production ◽

Stock Estimation ◽

Seagrass Density

The Carbon Stock and Potential Uptake of Seagrass Beds in the Northern and Eastern Part of Bintan Island. Seagrass is marine plant vegetation which have large potention on reducing carbondioxide emission effects in the environment. Nevertheless, the information about this potention is still limited, so the seagrass beds are still having less attention. Therefore, in April 2016 a research has done to estimate the potential of carbon stock and uptake at two location in Bintan Island, that were in the northern part (Pengudang Village) and in the eastern part (Teluk Bakau). Carbon stock estimation done by observing the seagrass density, meanwhile the carbon uptake by seagrasses was measured based on their growth/production rate. Its was known from the observation that the carbon stock potention of seagrass beds in both locations were almost at the same value, which were 133.24 gC/m2 (in the northern side) and 133.71 gC/m2 (in the eastern side). Nevertheless, the uptake of carbon (carbondioxide) which is used by segrass to produce leaves was higher in the eastern side at 0.50 gC/d/m2 than in the northern side at 0.10 gC/d/m2. From that productivity, the carbon storage rate by seagrass beds are 0.0630 gC/d/m2 in the north and 0.3375 gC/d/m2 in the east. Thus, seagrass bed area in the eastern side of Bintan Island (Teluk Bakau) was having higher carbon stock and uptake potential than in the northern side (Pengudang).

Download Full-text

Investor-State Dispute Settlement under NAFTA Chapter 11: The Shape of Things to Come?

Canadian Yearbook of international Law/Annuaire canadien de droit international ◽

10.1017/s0069005800006652 ◽

1998 ◽

Vol 35 ◽

pp. 263-290

Author(s):

J. Anthony VanDuzer

Keyword(s):

Free Trade Agreement ◽

Dispute Settlement ◽

Trade Agreement ◽

Minimum Standards ◽

The North ◽

State Behaviour ◽

Nafta Chapter 11 ◽

To Come ◽

The Right

SummaryRecently, there has been a proliferation of international agreements imposing minimum standards on states in respect of their treatment of foreign investors and allowing investors to initiate dispute settlement proceedings where a state violates these standards. Of greatest significance to Canada is Chapter 11 of the North American Free Trade Agreement, which provides both standards for state behaviour and the right to initiate binding arbitration. Since 1996, four cases have been brought under Chapter 11. This note describes the Chapter 11 process and suggests some of the issues that may arise as it is increasingly resorted to by investors.

Download Full-text

Long-term Cyclic Variations of Prominences, Green and Red Coronae over Solar Cycles

International Astronomical Union Colloquium ◽

10.1017/s0252921100064496 ◽

2000 ◽

Vol 179 ◽

pp. 201-204

Author(s):

Vojtech Rušin ◽

Milan Minarovjech ◽

Milan Rybanský

Keyword(s):

Emission Lines ◽

High Latitudes ◽

Green Line ◽

Solar Cycles ◽

The South ◽

Coronal Emission ◽

Local Maxima ◽

The North ◽

Cyclic Variations

AbstractLong-term cyclic variations in the distribution of prominences and intensities of green (530.3 nm) and red (637.4 nm) coronal emission lines over solar cycles 18–23 are presented. Polar prominence branches will reach the poles at different epochs in cycle 23: the north branch at the beginning in 2002 and the south branch a year later (2003), respectively. The local maxima of intensities in the green line show both poleward- and equatorward-migrating branches. The poleward branches will reach the poles around cycle maxima like prominences, while the equatorward branches show a duration of 18 years and will end in cycle minima (2007). The red corona shows mostly equatorward branches. The possibility that these branches begin to develop at high latitudes in the preceding cycles cannot be excluded.

Download Full-text