KILLER TORNADOES DURING HIGH TIDE PERIOD

AbstractWe show that the ice plain in the mouth of Whillans Ice Stream (formerly Ice Stream B), Antarctica, moves by stick–slip motion. During a spring-tide period, rapid motions regularly occur near high tide and during falling tide. This correlation is weaker during a neap-tide period when the tidal magnitudes are less. Precise timing of these motion events suggests that they propagate through the region with a mean velocity of 88 m s−1.We hypothesize that this speed is associated with the propagation of shear waves through a wet subglacial till. Motion events are also seen on more smoothly flowing floating ice. Event delays are very short between grounded and floating stations, suggesting the events propagate through the ice shelf as an elastic wave. We further hypothesize the events are caused by the interaction of a sticky bed, the accumulation of stored elastic strain through the compression of ice by upstream inflow, and tidal forcing. Motion events seem to be triggered either by reduction of vertical normal stresses at high tide or by the increase of shear stresses from sub-shelf ocean currents during falling tide. Event magnitudes are not related to the length of the preceding quiescent period, suggesting significant viscous dissipation within the till.

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Underwater television observations on the intertidal movements of shore crabs, Carcinus maenas, across a mudflat

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s002531540004594x ◽

1981 ◽

Vol 61 (1) ◽

pp. 107-116 ◽

Cited By ~ 29

Author(s):

P. J. Dare ◽

D. B. Edwards

Keyword(s):

Carapace Width ◽

High Tide ◽

Carcinus Maenas ◽

Observation Point ◽

Population Densities ◽

Large Numbers ◽

North Wales ◽

Shore Crabs ◽

Underwater Television ◽

Tide Period

Closed circuit underwater television observations showed that, in summer, large numbers of Carcinus maenas performed daytime tidal migrations up and down a small mudflat in the Menai Strait, North Wales. At the observation point, 25 m above mean low water mark of spring tides, numbers of crabs moving upshore on flood tides averaged 84 m—1 of tideline, ranging from 48 to 126 m—1. Most crabs were of 20–50 mm carapace width (1 and 11 groups); none smaller than 15 mm was seen. Peak movements occurred in at least 0.5 m depth of water. Over the high tide period, most crabs were dispersed over the upper half of the mudflat where crab population densities of 1·8–2·5 m—2 were indicated by diving observations.

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Monthly Chaetocerotales diversity and abundance, and its relationship with water physicochemical parameters and phytoplankton diversity in Carey Island mangrove ecosystem, Malaysia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d220744 ◽

2021 ◽

Vol 22 (7) ◽

Author(s):

NURUL SHAHIDA REDZUAN ◽

Pozi Milow

Keyword(s):

Negative Correlation ◽

Temporal Variability ◽

Physicochemical Parameters ◽

High Tide ◽

Mangrove Ecosystem ◽

Phytoplankton Diversity ◽

Chaetoceros Curvisetus ◽

Physical And Chemical ◽

The Relationship ◽

Tide Period

Abstract. Redzuan NS, Milow P. 2021. Monthly Chaetocerotales diversity and abundance, and its relationship with water physicochemical parameters and phytoplankton diversity in Carey Island mangrove ecosystem, Malaysia. Biodiversitas 22: 2919-2927. Globally, phytoplankton of order Chaetocerotales has been reported to cause monospecific bloom events. The blooms that normally lead to ecosystem instability, also physically responsible for histological and physical damages to fishes. Regarding that order Chaetocerotales often display significant temporal variability, this study aimed to investigate the monthly variability of species composition and cell density of phytoplankton of order Chaetocerotales during high tide period immersion were investigated over a year period. In addition, this present study also aimed to analyze the relationship between Chaetocerotales diversity and abundance with physical and chemical parameters that potentially controlling their temporal variability. Samplings were carried out from April 2009 until March 2010 in the mangrove ecosystem of Carey Island, Selangor, Malaysia. Of 84 phytoplankton taxa recorded, 18 species belonged to order Chaetocerotales, i.e. the genera Bacteriastrum and Chaetoceros. Although initially the sampling was designed to study the overall phytoplankton, the study also aimed at high temporal variability in Chaetocerotaceae cells density has called for this paper to be written. Interestingly, order Chaetocerotales showed to have negative correlation with the total phytoplankton species. Chaetocerotales blooms at the study site were represented by multispecies blooms, with Chaetoceros curvisetus as the highest species in the events. Dissolved oxygen, on the other hand, showed to have negative correlation Chaetocerotales' cells density. All of the species, except the Chaetoceros subtilis and Chaetoceros neglectus displayed significant temporal monthly variability across twelve months of sampling. Nitrate, phosphate and temperature are potentially the parameters that stimulate the growth of the order, consequently causing bloom events.

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THE STRATEGY OF PHYSIOLOGICAL AROUSAL OF ATHLETES IN SPORTS COMPETITION BASED ON DRUG INTERVENTION

Revista Brasileira de Medicina do Esporte ◽

10.1590/1517-8692202127022020_0136 ◽

2021 ◽

Vol 27 (spe2) ◽

pp. 99-103

Author(s):

Jiao Chen ◽

Hongtao Li

Keyword(s):

Evaluation System ◽

High Tide ◽

Stable State ◽

Principal Component ◽

Physiological Arousal ◽

Analytic Hierarchy ◽

Analgesic Drugs ◽

Organ Systems ◽

Hierarchy Process ◽

Tide Period

ABSTRACT Generally speaking, the physiological index of the human body is in a relatively stable state, which refers to the function of various organ systems with the characteristics of high-tide period, low-tide period and critical period. However, for competitive athletes, it is necessary to maintain physiological activation in both training and competition. In view of this, this study will analyze the physiological arousal degree of aspirin and acetaminophen in order to provide a reference for athletes to take analgesic drugs. In this study, the analytic hierarchy process (AHP), principal component analysis and factor analysis, were used to construct a scientific evaluation system of physiological arousal level, and the medication and non-medication status of 90 athletes were evaluated. The results showed that aspirin was better than acetaminophen in blood urea and serum creatine kinase, and the comprehensive score of some athletes was higher than 0.95. Aspirin is better in arousing athletes’ physiology. The research results will provide scientific guidance for athletes to take antipyretic and analgesic drugs.

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Reproductive ecology of an intertidal red seaweed, Gracilaria gracilis: influence of high and low tides on fertilization success

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315402005349 ◽

2002 ◽

Vol 82 (2) ◽

pp. 189-192 ◽

Cited By ~ 11

Author(s):

Carolyn R. Engel ◽

Christophe Destombe

Keyword(s):

High Tide ◽

Virgin Female ◽

Fertilization Success ◽

Red Seaweed ◽

Rock Pools ◽

Gamete Release ◽

Gracilaria Gracilis ◽

Tide Period ◽

High Shore

Patterns of in situ fertilization success with respect to high and low tide periods are reported for the intertidal red seaweed Gracilaria gracilis which inhabits rock pools. Cystocarp (zygote) production was experimentally compared at high tide and low tide in both high- and low-shore tide pools at two sites using ten virgin female plants. High- and low-shore pools showed different patterns with respect to tide period. High-shore pools showed significantly greater numbers of cystocarps at low tide than at high tide whereas cystocarp production did not differ between high and low tide periods in low shore pools. The possible mechanisms of gamete release are discussed in light of these results.

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Do Staging Semipalmated Sandpipers Spend the High-Tide Period in Flight over the Ocean to Avoid Falcon Attacks along Shore?

Waterbirds ◽

10.1675/063.034.0208 ◽

2011 ◽

Vol 34 (2) ◽

pp. 195-201 ◽

Cited By ~ 23

Author(s):

Dick Dekker ◽

Irma Dekker ◽

David Christie ◽

Ronald Ydenberg

Keyword(s):

High Tide ◽

Tide Period ◽

Semipalmated Sandpipers

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Socioeconomic Challenges faced by Basin’s People in India

Think India ◽

10.26643/think-india.v22i2.8730 ◽

2019 ◽

Vol 22 (2) ◽

pp. 296-304

Author(s):

Biplab Tripathy ◽

Tanmoy Mondal

Keyword(s):

River Basin ◽

High Tide ◽

North East ◽

The People ◽

Term Basis ◽

Major River ◽

River Ganga ◽

Basin Region ◽

Basin Area

India is a subcontinent, there huge no of people lived in river basin area. In India there more or less 80% of people directly or indirectly depend on River. Ganga, Brahamputra in North and North East and Mahanadi, Govabori, Krishna, Kaveri, Narmoda, Tapti, Mahi in South are the major river basin in India. There each year due to flood and high tide lots of people are suffered in river basin region in India. These problems destroy the socio economic peace and hope of the people in river basin. There peoples are continuously suffered by lots of difficulties in sort or in long term basis. Few basin regions are always in high alert at the time of monsoon seasons. Sometime due to over migration from basin area, it becomes empty and creates an ultimate loss of resources in India and causes a dis-balance situation in this area.

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MONITORING WATER QUALITY IN BALLONA LAGOON: NITRATE LEVEL FLUCTUATION IN LOW AND HIGH TIDE CONDITIONS

10.1130/abs/2020am-357924 ◽

2020 ◽

Author(s):

Georgina Campos ◽

◽

Marleni Estrada ◽

Patrick Kwan ◽

Daniel Venegas ◽

...

Keyword(s):

Water Quality ◽

High Tide ◽

Level Fluctuation ◽

Nitrate Level

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NODAL CYCLE, QUASI-LUNAR CYCLE, AND FLORIDA CURRENT INFLUENCES ON HIGH TIDE LEVEL IN MIAMI FLORIDA

10.1130/abs/2020am-356657 ◽

2020 ◽

Author(s):

Martina Rogers ◽

◽

Michael C. Sukop ◽

Jayantha Obeysekera ◽

Florence George ◽

...

Keyword(s):

High Tide ◽

Lunar Cycle ◽

Florida Current ◽

Tide Level

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Environmental Variation and How its Spatial Structure Influences the Cross-Shelf Distribution of High-Latitude Coral Communities in South Africa

Diversity ◽

10.3390/d11040057 ◽

2019 ◽

Vol 11 (4) ◽

pp. 57 ◽

Cited By ~ 1

Author(s):

Sean N. Porter ◽

Michael H. Schleyer

Keyword(s):

South Africa ◽

Continental Shelf ◽

High Latitude ◽

Environmental Variables ◽

Environmental Gradients ◽

High Tide ◽

Environmental Variation ◽

Shelf Edge ◽

Spatial Differences ◽

Coral Communities

Coral communities display spatial patterns. These patterns can manifest along a coastline as well as across the continental shelf due to ecological interactions and environmental gradients. Several abiotic surrogates for environmental variables are hypothesised to structure high-latitude coral communities in South Africa along and across its narrow shelf and were investigated using a correlative approach that considered spatial autocorrelation. Surveys of sessile communities were conducted on 17 reefs and related to depth, distance to high tide, distance to the continental shelf edge and to submarine canyons. All four environmental variables were found to correlate significantly with community composition, even after the effects of space were removed. The environmental variables accounted for 13% of the variation in communities; 77% of this variation was spatially structured. Spatially structured environmental variation unrelated to the environmental variables accounted for 39% of the community variation. The Northern Reef Complex appears to be less affected by oceanic factors and may undergo less temperature variability than the Central and Southern Complexes; the first is mentioned because it had the lowest canyon effect and was furthest from the continental shelf, whilst the latter complexes had the highest canyon effects and were closest to the shelf edge. These characteristics may be responsible for the spatial differences in the coral communities.

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