IS INCREASING CARBON DIOXIDE COOLING OUR EARTH?

IS INCREASING CARBON DIOXIDE COOLING OUR EARTH?
By
Dr. Nitish Priyadarshi

Carbon Dioxide:

Carbon dioxide is probably the most important of the greenhouse gases as it accounts for the largest proportion of the 'trace gases' and is currently responsible for 60% of the 'enhanced greenhouse effect'. It is thought that it's been in the atmosphere for over 4 billion of the Earth's 4.6 billion year geological history and in much larger proportions (up to 80%) than today.
Most of the carbon dioxide was removed from the atmosphere as early organisms evolved photosynthesis. This locked away carbon dioxide as carbonate minerals, oil shale and coal, and petroleum in the Earth's crust when the organisms died. This left 0.03% in the atmosphere today.

The natural carbon dioxide cycle:

Atmospheric carbon dioxide comes from a number of natural sources, mainly the decay of plants, volcanic eruptions and as a waste product of animal respiration.
It is removed from the atmosphere by photosynthesis in plants and by dissolving in water, especially on the surface of oceans.
Carbon dioxide stays in the atmosphere for approximately 100 years.
The amount of carbon dioxide taken out of the atmosphere by plants is almost perfectly balanced with the amount put back into the atmosphere by respiration and decay. Small changes as a result of human activities can have a large impact on this delicate balance.

The impact of human activities:

Over the past three centuries, concentration of carbon dioxide is reported to be increasing in the Earth’s atmosphere, due to human activities like the burning of fossil fuels and deforestation that cause the release of carbon dioxide into the atmosphere.
Burning fossil fuels releases the carbon dioxide stored millions of years ago. We use fossil fuels to run vehicles (petrol, diesel and kerosene), heat homes, businesses and power factories. Deforestation releases the carbon stored in trees and also results in less carbon dioxide being removed from the atmosphere.
From the early 1700s, carbon dioxide has increased from 280 ppm to 360 ppm in 1990. many studies suggest that higher concentration of carbon dioxide in the atmosphere will enhance the green house effect making the earth warmer. It is likely that the thinning of ice masses, and retreat of glaciers of Himalaya and trans-Himalayan region during the last 150 years or so is an affect of such warming.
Most computer models suggest that the globe will warm up 1.5 degree centigrade to 4.5 degree centigrade if carbon dioxide reaches the predicted level of 600 ppm by the 2050. although this may be largely true, there are other possible mechanisms that could act in the opposite direction. For instance the sulphate aerosols-the tiny bit of dust that are also added to the atmosphere when fossil fuels are burned by human activity, may cool the climate. The aerosols reflect away the sun’s radiation. Thus, they partially counter the warming that may be caused by the greenhouse gases. However, the degree to which these emissions might reduce the impact of greenhouse gases is not yet fully understood.
Studies suggest that an increase in ocean temperatures associated with global warming could lead to increase in emission of dimethyl sulfide by photosynthesis. This would in turn increase the concentration of sulphate aerosols in the marine boundary layer causing an increase in the number of cloud drops. The net result of the cloud will be to cool the Earth to offset the warming by the greenhouse effect.
Sulphate aerosol is a type of solid compound commonly found in the atmosphere. Sulphate particles play an important role in reflecting, absorbing, and scattering incoming solar energy. The source of these compounds is both natural and man-made. Most of the man-made particles come from combustion of fossil fuels.
It is therefore possible that increased levels of trace gases in the atmosphere would lead to cooling of the Earth rather than to a net heating.

Reference:
• http://www.bbc.co.uk/climate/evidence/carbon_dioxide.shtml
• Mathur, U.B. 2005. Quaternary Geology Indian Perspective. Geological Society of India, Bangalore.

QUATERNARY CLIMATE CHANGE

QUATERNARY CLIMATE CHANGE

By

Dr. Nitish Priyadarshi

In recent years, the global climate has been exhibiting signs of change that can neither be overlooked nor fully explained in the terms of natural climate variations. In this context, scientists, environmentalists, policy makers and others interested in the subject of climate change have been posing several fundamental questions like:

· Is the earth’s climate really changing?

· How has the climate changed in the past?

· Why does climate change?

· How much is the human influence on climate?

· What will the future climate be like?

· What are the likely impacts of climate change?

These questions are not new, but we are in a much better position to answer them today than ever before. We have come a long way towards a clearer understanding about connections among the different components of the climate system, the nature of the feedback mechanisms and the natural dynamics of the natural system.

The climate system is subjected to external forcings like the incoming solar radiation, and is also influenced by internal interactions among its five components viz., the atmosphere, hydrosphere, cryosphere, lithosphere and the biosphere. In the past, scientists have treated them individually and it is only now that the linkages among these components are being brought into proper perspective.

The term Quaternary is derived from the Latin word “quatern” and refer to the most recent period of the Earth’s history covering a span of the past ca 1.77 m.y. (million years) and extends upto the present day. The Quaternary period is subdivided into Pleistocene and Holocene epochs. Originally the term Pleistocene was proposed for the epoch which comprises 70% of the species that are still living. The term Holocene was introduced for the part of the Quaternary that contains only species that are still living.

During the short interval of the Quaternary, some very important events took place, which are of great consequence for us today. It is characterized by dramatic climatic changes, including repeated glacial and interglacial events.

Climate change is a dynamic phenomenon. Climate is continuously changing, sometimes at a slow pace, sometimes faster. In the geological past, the earth was probably warmer for most of the time than at present, with little or no polar ice. However at frequent intervals, extensive glaciations occurred in the past. The last glaciation, prior to the Quaternary ice ages, took place during late Carboniferous to basal Permian ca 300 m.y. ago.

The world began to cool rapidly in late Tertiary about 40 m.y. ago. By about 2.6 m.y. ago, the world had cooled so much that ice sheets began to form in northern Canada and Scandinavia. In the Indian sub-continent, glaciers spread far and wide over Potwar, Kashmir, Kangra, and in Ladakh-Tibet regions. From this time onwards, climate changes were more dramatic than during earlier geological times. During certain time intervals of Quaternary, temperatures dropped too low forming large ice sheets. However at other times the climate was warm, comparable to that of today, or even warmer.

Early only four glacial periods, of varying duration and severity, with the intervening interglacial periods, during which the climate became warmer, were recognized during the quaternary. Now it is certain that the number of such episodes exceeded four.

Another important feature of Quaternary was intense dune-building activity from time to time. In the deserts of Sahara (Africa), India, the Middle East and Australia, the time of peak aridity and maximum dune activity was during the last glacial period about 20 k.y. to 12 k.y. ago. One estimate is that the tropical arid zones were five times larger during the times of peak glaciation. Sea level was lower at these times (consequently exposing large continental shelf area to erosion), water was colder, and tropical cyclones were less extensive, resulting in decreased rainfall.

During glaciations, lower sea-level brought about another important geological effect on the land. The rivers started down-cutting their valleys and sedimentation pattern changed. There were many other similar changes consequent to the climate changes during Quaternary, like lake-level change and lowering of river discharge because of changes in precipitation.

Indian Monsoon during Holocene:

From palaeoclimate studies of the Indian monsoon, it is postulated that four monsoon maxima occurred during the last 150,000 years in association with solar radiation changes.

Pollen density sequences from lake beds of northwestern India and lake levels suggest that the monsoon were weak before 18,000 years B.P., that a warm and humid climate existed between 10,000 and 5,000 years B.P. or early Holocene, and that trend towards aridity set in around 3,500 years B.P. Tibetan ice core analysis indicate prolonged drought during the 18^th century A.D. Extensive sampling of tree rings over western Himalayas has shown signatures both of the little Ice Age and the Medieval Warm Period. The northern limit of the monsoon reaching the desert margins has undergone wide fluctuations in the past, coinciding with the rise and decline of civilization such as the Indus Valley Civilization (2300-1700 B.C.), ‘Painted Grayware’ Culture (700-300 B.C.) and the Rangamahal Culture (100-200 A.D.).

Until recently, human activities have been considered to be an insignificant force in natural dynamics. Today, their impact has begun to match, and even exceed, that of natural processes. Fossil fuel reserves that were generated over a period of several hundred million years are now on the verge of depletion. As much as 50% of the land surface has been transformed by direct human action, with significant consequences for biodiversity, nutrient cycling, soil structure, biology and climate.

It appears that we are in a process of transition from the Holocene into a new epoch, for which the Nobel Prize winner, Paul Crutzen, and other scientists have coined the term “Anthropocene”.

Reference:

1. Quaternary Geology Indian Perspective (2005) by U.B. Mathur. Geological Society of India.
2. The Indian Monsoon as a component of the climate system during the Holocene,(2006) by R.R. Kelkar, In journal of Geological Society of India, Vol.68, no.3.

Nitish Priyadarshi

Geologist

Rch_nitishp@sancharnet.in

What is Hydrazine?

Spy Satellite holding toxic hydrazine destroyed.
What is Hydrazine?
By
Dr. Nitish Priyadarshi

U.S officials say a missile launched from a Navy ship in the Pacific successfully hit a U.S. spy satellite more than 200 kilometers above the Earth today on 21Feb. 2008. The dying satellite stopped communicating with controllers on Earth shortly after it was launched 14 months ago, and it began to slowly fall. The shoot-down was intended to destroy a tank aboard the craft holding 450 kilograms of a toxic fuel called hydrazine. Officials said the fuel posed a danger to humans if the tank survived re-entry.
Hydrazine is the chemical compound with the formula (NH2)2. It has an ammonia-like odor, and is derived from ammonia, but its physical properties are more similar to those of water. Hydrazine is usually handled as 60% aqueous solution. It is mainly used in as a blowing agent in preparing polymer foams, but significant applications also include its uses as a precursor to polymerization catalysts and pharmaceuticals. It is used in rocket fuels
Hydrazine is used in many processes including: production of spandex fibers, as a polymerization catalyst; in fuel cells, solder fluxes; and photographic developers, as a chain extender in urethane polymerizations, and heat stabilizers.
Hydrazine a toxic, flammable caustic liquid and a strong reducing agent. Its odour is similar that of ammonia, though less strong. It is slightly soluble in ammonia and methyl-amine. It is soluble in water, methanol, ethanol, UDMH, and ethylenediamine. Hydrazine is manufactured by the Raschig process, which involves the oxidation of ammonia to chloramine, either indirectly with aqueous sodium hypochlorite or directly with chlorine, and subsequent reaction of chloramine with excess ammonia. Raw materials include caustic, ammonia, and chlorine; these are high-tonnage, heavy chemicals.

SAFETY:-

Hydrazine is highly toxic and dangerously unstable, especially in the anhydrous form. According to the U.S. Environmental Protection Agency:
Symptoms of acute (short-term) exposure to high levels of hydrazine may include irritation of the eyes, nose, and throat, dizziness, headache, nausea, pulmonary edema, seizures, coma in humans. Acute exposure can also damage the liver, kidneys, and central nervous system. The liquid is corrosive and may produce dermatitis from skin contact in humans and animals. Effects to the lungs, liver, spleen, and thyroid have been reported in animals chronically exposed to hydrazine via inhalation. Increased incidences of lung, nasal cavity, and liver tumors have been observed in rodents exposed to hydrazine

Reference:
http://www.astronautix.com/props/hydazine.htm
http://en.wikipedia.org/wiki/Hydrazine
http://www.voanews.com/english/2008-02-21-voa4.cfm

HEALING POWER OF RUBY CRYSTAL

HEALING POWER OF RUBY CRYSTAL-SOME FACTS
BY
Dr. Nitish Priyadarshi

Ruby is an excellent stone for energy. Imparting vigor to life, it energizes and balances but may sometimes over stimulate in delicate or irritable people. Ruby encourages passion for life but never in a self-destructive way. It improves motivation and setting of realistic goals.
Most rubies come from Sri Lanka, but the best quality stones are mined in Burma. The rich red wine colour of these jewels is enhanced by electric light so it is always advisable to examine them in natural day light before purchase.
Because of its colour, the ruby has always been associated with healing diseases of the blood. Eastern mythology calls it ‘a drop of blood from Mother Earth’s heart’.
Red colour of ruby is due to Cr2 03 present in solid solution. In low concentration colour is pale, inclining to pink. With a concentration between 1% and 4%, colour deepens. Some amount of iron is generally present in ruby, which reduces the richness of red shale. With a higher amount of iron ruby turns brownish. Chromium rich rubies impart red fluorescence. Iron rich rubies may not fluorescence at all.
Different crystals now a days are used in medical practices. They are piezoelectric, which means that electricity, and sometimes light, is produced by compression. This property is harnessed in ultrasound machines, which use a piezoelectric crystal to produce a sound wave. Sound is now being applied at the leading edge of the surgery. A tightly focused beam of ultrasound can cauterize wounds deep within the body and blast tumors without the need for invasive procedures.
Crystals were created as the earth formed and they have continued to metamorphose as the planet itself has changed. Crystals are the earth’s DNA, a chemical imprint for evolution. They are the miniature storehouses, containing the records of the development of the earth over million of years.
Rubies have a hardness of 9.0 on the Mohs scale of mineral hardness. Among the natural gems only diamond is harder, with a Mohs 10.0 by definition.
All natural rubies have imperfections in them, including color impurities and inclusions of rutile needles known as "silk". Gemologists use these needle inclusions found in natural rubies to distinguish them from synthetics, simulants, or substitutes. Usually the rough stone is heated before cutting. Almost all rubies today are treated in some form, with heat treatment being the most common practice. However, rubies that are completely untreated are still of excellent quality and command a large premium.
Its color varies from deep cochineal to pale rose red, in some cases inclining to purple, the most valued tint being that know to experts as pigeon’s blood color. On exposure to a high temperature the ruby becomes green, but regains its original color on cooling-a behavior which is consistent with the supposition that the stone owes its color to the presence of oxide of chromium, and indeed in artificial rubies the required tint is always obtained by the use of some compound of chromium.

Ruby stimulates the heart chakra and balances the heart. It promotes positive dreams and clear visualization, and stimulates the pineal gland.
Physically Ruby overcomes exhaustion and lethargy and imparts potency and vigor. Conversely, it calms hyperactivity.
Ruby detoxifies the body, blood and lymph, and treats fever, infectious disease, and restricted blood flow. It stimulates the adrenals, kidneys, reproductive organs and spleen.
In Ancient Greece it was thought that rubies and other crystals could be either male or female. Stones with stronger colours were said to be male while paler varieties of the same crystal indicated that they were female. The ruby is one of several stones said to foretell death. If its colour paled or changed to black, the wearer’s life was in danger.

Reference:
1. http://www.1902encyclopedia.com/R/RUB/ruby.html
2. The Crystal Bible by Judy Hall
3. The healing power of crystals by Cass and Janie Jackson.
4. Gems and Gem Industry in India, by R.V. Karanth, Geological society of India.

Evidence of abandoned mines on Mars Planet.

Evidence of abandoned mines on Mars Planet
By
Dr. Nitish Priyadarshi
Nasa’s spirit is seen exploring bright, loose material on the Mars. According to NASA it is a most colorful deposits. It has a powdery and cloddy texture and exhibits a high abundance of salt. Spirit analyzed the bright, yellowish exposures. Scientists hypothesized and then confirmed that these materials have a salty chemistry dominated by iron-bearing sulfates. These salts may record the past presence of water, as they are mostly easily mobilized and concentrated in liquid solution.
But if you see the other side of this concept. This deposit or structure very much resembles abandoned open mines similar to coal mines or Bauxite mines or Iron ore mines on our Earth. The white deposit very much resembles to the clay deposits in coal mines area. Clays are generally treated as mine wastes. But due to lack of evidence of vegetation both at present and past on Mars, formation of coal deposit can be questioned. If it is lost Bauxite mines the white deposits may be clay mineral Kaolinite. The photographs clearly indicate that this is one of the abandoned mines after the exploitation of the minerals. White matter also resembles with Borax. Borax occurs in the waters of saline lakes and in salt pans in desert regions. In both cases derived from solar evaporation of saline waters.
If you see the outer boundary or curve in the photograph it is very similar to open mines here on the Earth. In other words it is more man made than natural.
Mining may have been done either by the lost civilization of Mars or by the other civilization of other planets and left it with this structure after exploiting the minerals.

Dr. Nitish Priyadarshi
Geologist