Temporal and Spatial Variabilities of Chemical and Physical Parameters on the Heron Island Coral Reef Platform

2021 ◽  
Author(s):  
Samuel A. H. Kekuewa ◽  
Travis A. Courtney ◽  
Tyler Cyronak ◽  
Theodor Kindeberg ◽  
Bradley D. Eyre ◽  
...  
Keyword(s):  
Coral Reef ◽  
Physical Parameters ◽  
Temporal And Spatial ◽  
Reef Platform

scholarly journals Mass and Energy Supply of Fine Structure to the Solar Corona

2004 ◽  
Vol 219 ◽  
pp. 123-127
Author(s):  
Kostas Tziotziou ◽  
Georgia Tsiropoula
Keyword(s):  
Solar Corona ◽  
Mass Balance ◽  
Magnetic Reconnection ◽  
Solar Atmosphere ◽  
Cloud Model ◽  
Physical Parameters ◽  
Mean Values ◽  
Fine Structures ◽  
Temporal And Spatial

We investigate the role of chromospheric fine structures, e.g. mottles (spicules), in the mass balance and heating of the solar atmosphere by studying two-dimensional high-resolution Hα observations. The temporal and spatial variations of the line-of-sight (LOS) velocity, obtained with an inversion technique based on a cloud model, provide strong indications that the mechanism responsible for the driving of the observed flows is magnetic reconnection. Apart from the LOS velocity, application of the cloud model enables the derivation of several other physical parameters, like pressure, temperature, density etc. Mean values of these parameters permit the estimation of the role of these structures in the mass balance of the solar atmosphere. They, furthermore, permit a reasonable estimate of the energy provided by magnetic reconnection which is available for the heating of the solar corona.

scholarly journals BENTHIC COMMUNITIES AND GEOMORPHOLOGY OF THE TESORO ISLAND CORAL REEF, COLOMBIAN CARIBBEAN

2016 ◽  
Vol 24 ◽  
Author(s):  
Juan Armando Sánchez M.
Keyword(s):  
Coral Reef ◽  
Benthic Communities ◽  
Windward Side ◽  
Leeward Side ◽  
Acropora Cervicornis ◽  
The Past ◽  
Montastraea Annularis ◽  
Caribbean Coral Reef ◽  
Mud Diapirism ◽  
Reef Platform

The benthic communities distribution in Tesoro Island (Colombian Caribbean) coral reef was determined by cartography of reef morphology and functional groups from aerial photographstheodolite triangularon, and bottom transects over depths ranging from Oto 30 m. Tesoro Island is a sand cay reef developed over an emerged reef platform whose basal cone possibly originated by mud diapirism on the continental shelf. The benthic communities are distributed as subzones of the geomorphologic units. The reef crest lies along the breaker zone, formed by Millepora spp. buttresses covered on their tops by Palythoa spp. and seawardly by a turf of Dictyota spp. The rear reef (varying from 0.5-1.5 m in depth) is composed of pavement and grooves with live Pontes pontes and P. astreoides. The foré-reef terrace (2 to 9 m in depth) shows a low relief spur and grooves, composed of Acropora pa/mata skeletons on the windward side and A. cervicornis on the leeward side; sandy accumulations with dense and tall colonies of the gorgonaceans Pseudopterogorgia spp. are also appreciated. In the sandy reef platform there are monospecific patches of Montastraea annularis, P. pontes, M. faveolata, dead Acropora cervicornis and wide sandy zoneswhere patches of Halimedamonile are found. The slope edge, (depths ranging between 7 to >30m) shows mixed corals and gorgonaceans, at the drop-off, laminar corals, especially Montastraea franksiand Agaricia spp., jointly with other deep water organisms such as ellisellid gorgonaceans and antipatharians are found. The benthic communities distribution is influenced by reef geomorphology, wave energy diffraction and the past mass mortality of Acropora.

Temporal and spatial variation in bacterial production in the water column over a coral reef

1985 ◽  
Vol 85 (3) ◽  
pp. 285-292 ◽  
Author(s):  
D. J. W. Moriarty ◽  
P. C. Pollard ◽  
W. G. Hunt
Keyword(s):  
Coral Reef ◽  
Spatial Variation ◽  
Water Column ◽  
Bacterial Production ◽  
Temporal And Spatial Variation ◽  
Temporal And Spatial

scholarly journals Bioecology of coral reef in Panjang Island of Central Java Indonesia

2021 ◽  
Vol 26 (2) ◽  
pp. 125-134
Author(s):  
Suryono Suryono ◽  
Ambariyanto Ambariyanto ◽  
Munasik Munasik ◽  
Diah Permata Wijayanti ◽  
Raden Ario ◽  
...  
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Chlorophyll A ◽  
Coral Cover ◽  
Sea Surface ◽  
Anthropogenic Activity ◽  
Physical Parameters ◽  
Mortality Index

Coral reefs currently are suffered from natural factors along with increasing anthropogenic activity. Panjang Island, a small reef island located in Jepara Regency, may also be experiencing such conditions. Therefore, this work was aimed to observe the condition of the coral cover of Panjang Island. Line intercept transect was applied to survey the coral cover and mortality index from fourteen stations. Insitu data consisted of the bottom substrate composition of the reefs and the physical parameters of the sea. The secondary data, i.e. coral reef area maps from 2001 to 2019 were taken from Landsat Image 7 and 8, data of wind were obtained from www.ogimet.com, while tidal data were collected from BMKG. The bathymetry was determined from the Geospatial Information Agency data, salinity global analysis forecast Phy 001.024 (CMEMS). Sea surface temperature (SST), and chlorophyll-a distribution were analyzed using ENVI software. The result showed that Panjang Island has a poor to the moderate condition of hard coral.  Two out of six categories of abiotic and dead coral were found to be high. The mortality index of coral was in the high category (average 0.52). During research periods the sea waters were characterized by high sea surface temperature (29.34-30.94°C), chlorophyll-a was also tended to be high (0-2.65 mg.m-3), and an average of salinity was high 32 ‰. The weak currents came to all sides of the island, therefore the coral reef was not exposed to extreme currents. The waves came from the east, then the energy decreases after being blocked by coral reefs on the eastern side of the island, so that coral reefs in the northeast and south sides were safer to be exposed. The results suggest that hydrodynamic ecology directly or indirectly affected the percentage of coral cover and mortality index at the reefs of Panjang Island.

Microwave-Assisted Ignition

1996 ◽  
Vol 430 ◽  
Author(s):  
J. K. Bechtold ◽  
M. R. Booty ◽  
G. A. Kriegsmann
Keyword(s):  
Activation Energy ◽  
Behavior Analysis ◽  
Microwave Heating ◽  
Physical Parameters ◽  
Spatial Evolution ◽  
Combustible Material ◽  
Local Equation ◽  
Microwave Assisted ◽  
Temporal And Spatial ◽  
Ignition Characteristics

AbstractThe microwave heating and ignition of a combustible material is modeled and analyzed in the small Biot number and large activation energy regimes. Both the temporal and spatial evolution of the temperature within the material are described. The ignition characteristics are determined by a localized equation for the perturbation to the inert temperature, which is shown to exhibit thermal runaway behavior. Analysis of this local equation provides explicit ignition conditions in terms of the physical parameters in the problem.

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