A survey of environmental physico-chemical parameters during a minor coral mass bleaching event in Tahiti in 1993

1994 ◽  
Vol 45 (7) ◽  
pp. 1149 ◽  
Author(s):  
JH Drollet ◽  
M Faucon ◽  
S Maritorena ◽  
PMV Martin
Keyword(s):  
Solar Irradiance ◽  
Sea Water ◽  
Seawater Temperature ◽  
Total Solar Irradiance ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Hermatypic Corals ◽  
Solar Uv ◽  
Line Transects ◽  
A Minor

Hermatypic corals along two continuous 25-m-long line transects on the northern and eastern coasts of the island of Tahiti (Arue, buter reef slope, and Hitia'a, fringing reef, respectively) were monitored during a minor episode of coral bleaching in April and May 1993. From early February to the end of May, the physico-chemical parameters of the sea water (temperature, salinity, dissolved oxygen, pH and total solar irradiance) were noted once a week, and solar UV-B radiation was recorded from 1100 to 1400 hours every day. The results are consistent with a synergistic interaction between temperature and UV-B radiation, possibly associated with total solar irradiance. The interval of four weeks between peaks in solar UV-B radiation and seawater temperature may explain why the 1993 bleaching in Tahiti was minor. Different patterns of bleaching occurred in different species, and all corals recovered within four to six weeks. Hermatypic corals appear to have multiform reactions in response to environmental stresses.

Elevated sea-water temperature and solar UV-B flux associated with two successive coral mass bleaching events in Tahiti

1995 ◽  
Vol 46 (8) ◽  
pp. 1153 ◽  
Author(s):  
JH Drollet ◽  
M Faucon ◽  
PMV Martin
Keyword(s):  
Water Temperature ◽  
Coral Bleaching ◽  
Sea Water ◽  
Bleaching Event ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Long Line ◽  
Solar Uv ◽  
Line Transects ◽  
A Minor

After a minor coral bleaching event in 1993, a more dramatic episode occurred in Tahiti from March to July 1994. Coral bleaching was recorded along four continuous 25-m-long line transects. Physico-chemical parameters of the sea water (temperature, salinity, dissolved oxygen and pH) were noted once a week, and solar UV-B flux was recorded daily before and during the bleaching episode. Results emphasized the importance of the taxonomic position of coral in susceptibility to bleaching. The evolution of bleaching through time was related to mean daily solar UV-B flux and sea-water temperature. Moreover, comparison of the 1993 and 1994 data suggested temperature and/or UV-B thresholds that may elicit minor or severe bleaching events.

Total Biomass and Carbon Estimates in Mangrove Species of Bhitarkanika Wildlife Sanctuary (BWLS), Odisha

2018 ◽  
Vol 4 (02) ◽  
pp. 27-34
Author(s):  
Kakoli Banerjee ◽  
Gobinda Bal ◽  
Rakesh Paul
Keyword(s):  
Environmental Changes ◽  
Sea Water ◽  
Water Discharge ◽  
Total Carbon ◽  
Total Biomass ◽  
Chemical Parameters ◽  
Wildlife Sanctuary ◽  
Mangrove Species ◽  
Physico Chemical ◽  
Fresh Water Discharge

We estimated total biomass and total carbon in 18 selected woody mangrove species based on the IVI values along with physico-chemical parameters of sea water and soil. AGB and BGB values were calculated as per the standard protocol in BWLS in five sampling stations namely Dangmal, Bhitarkanika, Habalikhati, Ekakula and Gupti. The highest values of IVI were noted for E. agallocha followed by A. officinalis, A. marina, H. fomes and C. decandra. Total biomass of species range was found to be varying between 0.69 tha-1 in X. molluccensis and 2122.17 tha-1 in A. officinalis. Total site-wise biomass ranged between 0.22 tha-1 in B. cylindrica at Gupti and 1419.26 tha-1 in A. officinalis at Bhitarkanika. Total carbon was considered to be 50% of total dry biomass which varied from 188.45±21.87 tha-1 at Ekakula to 941.31±201.17 tha-1 at Bhitarkanika, respectively. The higher biomass and carbon in A. officinalis proves it to be highly adaptive to the environmental changes in the present geographical locale. The maximum biomass and carbon of all the mangrove species in station Bhitarkanika is due to the fact that this station receives the fresh water discharge of Baitarani river thereby the adequate lower salinity is maintained. The present study reveals that mangroves of Bhitarkanika Wildlife Sanctuary can store substantial amount of atmospheric carbon and therefore needs to be conserved and sustainably managed.

scholarly journals Reconstruction of Total Solar Irradiance by Deep Learning

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Yasser Abduallah ◽  
Jason T. L. Wang ◽  
Yucong Shen ◽  
Khalid A. Alobaid ◽  
Serena Criscuoli ◽  
...  
Keyword(s):  
Deep Learning ◽  
Solar Irradiance ◽  
Radiant Energy ◽  
Primary Source ◽  
Total Solar Irradiance ◽  
Physical Models ◽  
Data Availability ◽  
Earth’S Climate ◽  
A Minor ◽  
First Time

The Earth's primary source of energy is the radiant energy generated by the Sun, which is referred to as solar irradiance, or total solar irradiance (TSI) when all of the radiation is measured. A minor change in the solar irradiance can have a significant impact on the Earth's climate and atmosphere. As a result, studying and measuring solar irradiance is crucial in understanding climate changes and solar variability. Several methods have been developed to reconstruct total solar irradiance for long and short periods of time; however, they are physics-based and rely on the availability of data, which does not go beyond 9,000 years. In this paper we propose a new method, called TSInet, to reconstruct total solar irradiance by deep learning for short and long periods of time that span beyond the physical models' data availability. On the data that are available, our method agrees well with the state-of-the-art physics-based reconstruction models. To our knowledge, this is the first time that deep learning has been used to reconstruct total solar irradiance for more than 9,000 years.

scholarly journals Pollution Bactérienne Et Toxique Dans Les Eaux Des Rejets Industriels Et Domestiques Du Littoral Atlantique (Casablanca Est- Maroc)

2018 ◽  
Vol 14 (12) ◽  
pp. 283
Author(s):  
Amine Siba ◽  
Samir Eljaafari ◽  
Faouzia Mokhtari
Keyword(s):  
Pathogenic Bacteria ◽  
Sea Water ◽  
Oxygen Demand ◽  
Toxic Substances ◽  
Chemical Parameters ◽  
Total Chromium ◽  
Physico Chemical ◽  
Pre Treatment ◽  
Faecal Streptococci

In this work, we will focus on the assessment of the quality of the Casablanca EST coastline, including bacterial and toxic water pollution, before the realization of the SIDI BERNOUSSI pre-treatment station. For this purpose, a set of analyzes were carried out on the littoral waters to evaluate the quality of sea water. This companion of analyzes includes: Analyzes on the surface of the sea water: Physico-chemical parameters: pH, temperature, biological oxygen demand BOD 5. Undesirables substances: Nitrates (NO3-), Ammonium (NH4+), Phosphates (PO4-), Hydrocarbons. Bacteriological parameters: Faecal coliforms and faecal streptococci. Sediment Analysis: Arsenic (As), Barium (Ba), Cadmium (Cd), Total Chromium (CrT), Copper (Cu), Iron (Fe), Mercury (Hg), Lead (Pb), Selenium (Se), Zinc (Zn). Biodiversity analyzes: For algae: Arsenic (As), Cadmium (Cd), Mercury (Hg), Lead (Pb). For mussels: Cadmium (Cd), Mercury (Hg), Lead (Pb). The results showed that the waters of the east coast of Casablanca are contaminated with pollutants in this case pathogenic bacteria, toxic substances including heavy metals and other toxic substances; on the other hand, coastal biodiversity is also affected. This contamination is due to industrial activity in the area. but remains below, for most pollutants, normative limits. For bacteriological pollution, beaches AIN SEBAA and NAHLA recorded a coliform contamination and faecal streptococci exceeding the values of the Moroccan norm of bathing water.

scholarly journals VIRGO Radiometry and Total Solar Irradiance 1996–2000 Revised

2001 ◽  
Vol 203 ◽  
pp. 105-110 ◽  
Author(s):  
C. Fröhlich ◽  
W. Finsterle
Keyword(s):  
Solar Activity ◽  
Solar Irradiance ◽  
Solar Maximum ◽  
Total Solar Irradiance ◽  
Minimum Period ◽  
Long Term Changes ◽  
Early Increase ◽  
Solar Uv ◽  
Dependent Behaviour

The long-term changes of the VIRGO radiometers have been re-analyzed in detail in order to resolve the puzzle of the early increase of the total solar irradiance (TSI) as observed by VIRGO. The exposure dependent changes can be described by a model which is based on a combination of an early increase of the sensitivity and a degradation with time which is modulated by the dose of solar UV radiation each detector receives. After correcting for the exposure-dependent behaviour both operational radiometers show an increase of their sensitivity which depends only on the time they are switched-on. After removing this increase the VIRGO TSI remains more or less constant during the minimum period of solar activity and reaches the solar maximum at levels comparable to the ones of former maxima.

Seasonal Variation of Physico-Chemical Parameters in Kedilam River, Tamil Nadu, India

2012 ◽  
Vol 2 (10) ◽  
pp. 1-3
Author(s):  
Gyaneswar Bhuyan ◽  
◽  
Dr. R. Anandhan Dr. R. Anandhan ◽  
V. kavitha V. kavitha
Keyword(s):  
Seasonal Variation ◽  
Tamil Nadu ◽  
Chemical Parameters ◽  
Physico Chemical

Abundance of Noctiluca scintillans Macartney on the alteration of physico-chemical parameters at Minnie Bay, Port Blair, Andaman & Nicobar Islands, India

2007 ◽  
Vol 9 (3) ◽  
pp. 236-246
Author(s):  
P. D. Magesh ◽  
J. Santanakumar ◽  
P. Venkateshwaran ◽  
A. K. Abdul Nazar ◽  
R. Venkatesan ◽  
...  
Keyword(s):  
Chemical Parameters ◽  
Noctiluca Scintillans ◽  
Physico Chemical ◽  
Nicobar Islands

INFLUENCE OF PHYSICO- CHEMICAL PARAMETERS ON THE JOINT GROWTH OF MICROORGANISMS USED IN THE PRODUCTION OF BIOFUELS

2018 ◽  
Vol 8 (5) ◽  
pp. 48-50
Author(s):  
N.V. Lakina ◽  
◽  
A.I. Golovko ◽  
V.Yu. Doluda ◽  
V.G. Matveeva ◽  
...  
Keyword(s):  
Chemical Parameters ◽  
Physico Chemical
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