Friday, November 23, 2007

Astonishing Discovery over the Amazonian Rain Forest


International research team has discovered huge amounts of unexpected organic aerosols over the South-American tropical rain forests

Isoprene, an organic compound generated in large quantities by natural vegetation, was originally thought not to be involved in producing atmospheric aerosols. It has now been found to be a potentially major player in this process. An international team of scientists from the Max Planck Institute of Chemistry, Mainz, Germany, the University of Antwerp, Belgium, the Ghent University, Belgium, and the University of São Paulo, Brazil, examined natural aerosols from the Amazonian rain forest, and has found that they contained two previously unknown compounds, which are photooxidation products of isoprene. These compounds are hygroscopic and could impact cloud formation, rainfall and climate (Science, 20 February 2004).

Isoprene is a volatile organic compound that is emitted in large quantities by forest vegetation. Its annual emission is estimated to be 500 million tons worldwide. But although isoprene readily oxidizes to form volatile products, popular wisdom held that it didn’t form products that could contribute to aerosol particle formation. Intensive measurements over the Amazon Basin, however, revealed the presence of two novel 2?methyltetrol compounds. These compounds are formed in the atmosphere through reaction of isoprene with hydroxyl radicals. To exclude pollution of human origin, the measurements were performed during the rainy season in a remote location of the Amazon Basin. Wind trajectories showed that the air had traveled over several thousand kilometers of pristine tropical forest before being trapped and analyzed.

It is estimated that the photooxidation of isoprene results in an annual production of about 2 million tons of the new compounds. This represents between 5 and 25% of the organic aerosol formed by atmospheric photochemistry from biogenic precursors.

This discovery is a breakthrough because for the first time a link can be demonstrated between isoprene emitted by forest vegetation and formation of water soluble fine particles. These aerosol particles give rise to the formation of haze and reduce the visibility in forested areas. They have an effect on cloud formation and influence rainfall and climate. Original work:

Magda Claeys, Bim Graham, Gyorgy Vas, Wu Wang, Reinhilde Vermeylen, Vlada Pashynska, Jan Cafmeyer, Pascal Guyon, Meinrat O. Andreae, Paulo Artaxo and Willy Maenhaut Formation of Secondary Organic Aerosols Through Photooxidation of Isoprene Science, 303, 1173 (2004), 20 February 2004

Max Planck Society for the Advancement of Science Press and Public Relations Department




Thursday, November 22, 2007

Learn visually from www.accuweather.com

Book mark this link or page. Very useful weather/climate education from accuweather.com. Moreover it's a daily visual dosage of facts and how.

More education, facts and lots coming soon...




Partly Cloudy and chances of rain

Here i'm after 24hrs of my previous forecast.
Yesterday it was dry and we had cold winds from North-North-West.
Today the wind direction is slightly from North-East, this should be good for the chances of rain.
Our forecast is we might have light showers in the evening OR night of 22-Nov-2007.
You can see the present conditions in this pic...

Also here is the INFRARED pic of south-asia, you can see(Extreme right of the pic) the 2 T.Cyclones (Hagibis and Mitag) near Philipines. Will the "Hagibis" cross land and come into Bay-of-bengal LIVE? 3 more days for this answer. Previously these kind of systems has crossed into bay and grew again.





Wednesday, November 21, 2007

Traditional weather forecasting - Interesting

Traditional Methods
Wherever humans have settled around the world, being able to predict the weather has been an advantage. Most activities are closely linked to the weather, and communities often have a store of local weather knowledge or lore, often in the form of rhymes and mottos.

A favourite of traditional forecasters, pine cones open and close according to the humidity of the air. An open cone is supposed to mean dry weather and a closed cone indicates damp weather.

Seaweed and other marine algae also respond to changes in humidity. If the humidity is low, it is more likely to be dry the next day - dry seaweed indicates dry weather.

Can poems forecast the weather?
Oak and ash trees are deciduous trees which lose their leaves in winter. In Britain, supposedly if the ash tree has leaves first then it will be a summer of rain; if it is the oak tree first then it will be a fine summer instead. There is a rhyme for this:

Ash leaf before the oak, then we shall have a summer soak; Oak leaf before the ash, the summer comes with nary a splash

Another favourite is the poem:

Red sky at night, shepherd's delight / Red sky in the morning, shepherd's warning

The redness of the sky depends on the amount of dust particles in the air. In Britain, where weather comes from the west, a red sunset suggests that dry weather is approaching.

Such lore is based on years of observation and may sometimes be correct. However, it is likely to be wrong as often as it it right.




Clear sky to start...

At this time(9:03AM) yesterday it was raining heavily, but today at this time it's CLEAR with some thin clouds around. It's like again the North-East has been switched off...mmm
Chennai recorded around 6CM of rain in the past 24hrs.
Here is the latest forecast meteogram for Chennai...

Now here's our forecast for the day, The day will be partly cloudy, mild and high in humidity. Chance of light showers around mid-morning or in the evening.
The rain rate will go down, going by the meteogram.





Tuesday, November 20, 2007

Dire Global Warming Forecast

Dire Global Warming Forecast Issued by UN Panel

Cyclone Death Toll Up to 3,100 in Bangladesh, May Rise

From National Geographic News.
November 19, 2007
Azahar Ali huddled with his family, reading from the Koran, as the cyclone roared in. First the power went out, then screaming winds blew out the windows and ripped off the roof. Then the sea rushed in, washing him and his family away.

The 80-year-old awoke in a rice paddy to find his son, daughter-in-law, three grandchildren, and three other relatives dead, among the more than 3,100 people killed by Cyclone Sidr.

"I have lost everything," he said Monday while recounting the terror of the worst cyclone in more than a decade to hit this low-lying South Asian nation of 150 million people.

Details of the devastation and the stories of the survivors began to emerge as rescuers reached areas cut off four days earlier when the storm washed out roads and downed telephone lines.

At least 3,113 people were known dead and more than a thousand were missing, said Lt. Col. Main Ullah Chowdhury, a spokesperson for Bangladesh's army.

The Red Crescent Society, the Islamic cousin of the Red Cross, warned that the death toll could rise to 10,000 once rescuers reach outlying islands.

Mike Kiernan, spokesperson for the charity Save the Children, said the final toll could be between 5,000 and 10,000 deaths but added that "we won't know for certain for days or weeks."

He said hundreds of thousands of people managed to escape physical harm, but many lost their homes and crops.

"Just the fact that people were able to survive this does not mean they will survive the second wave of death that comes from catastrophes like this—from lack of clean water, food, basic medicines, and shelter," Kiernan said.

Swept Away

In the village of Parulkhel, residents and rescuers used bamboo poles to probe flooded fields, looking for submerged bodies.

When a woman's corpse was discovered, workers rushed in with sacks and a plastic sheet to lift the body out. Onlookers gathered, and one weeping man identified her as his mother.

"Some were identified and taken away by relatives. We buried dozens of others near where we found them," said Ali Akbar, a volunteer.

Survivors picked through the village's wreckage, looking for anything salvageable in a jumble of splintered wood, bamboo and corrugated iron houses, fallen trees, and bloated animal carcasses. A stench filled the air.

In the neighboring village of Bainsamarta, Sheikh Mubarak, 40, sat among the ruins of his hut weeping for his 12-year-old daughter.

"As our house was washed away by walls of water, I grabbed my daughter and ran for shelter. The monster waves swept her away from me," he said. "Allah should have taken me instead."

Survivors said many of the deaths could have been prevented, but people failed to heed warnings to move to higher ground as the storm approached Thursday.

"Nothing is going to happen—that was our first thought, and we went to bed," said Dhalan Mridha, a 45-year-old farm worker from the village of Galachipa.

"Just before midnight the winds came like hundreds of demons. Our small hut was swept away like a piece of paper, and we all ran for shelter," he said.

On the way, Mridha was separated from his wife, mother, and two children. He found their bodies the next morning, stuck in a battered bush.

Relief Efforts

Government and relief agencies stepped up efforts to get help to devastated areas.

Army helicopters flew in high-protein cookies supplied by the World Food Program, said Emamul Haque, a spokesperson for the UN agency's office in the capital, Dhaka.

International groups promised initial aid totaling $25 million during a meeting with Bangladesh agencies Monday, Haque said.

Tents, water, rice, and other relief items have been slow to reach many.

In the town of Barguna long lines of anxious people formed at the market, hoping for word that help was on the way.

"We have been waiting here for several hours, but no relief," said Uthan Ching, who left clutching an empty plastic bag.

Government officials defended relief efforts and expressed confidence that authorities were up to the task.

"We have enough food and water," said Shahidul Islam, the top official in Bagerhat, a battered district near Barguna. "We are going to overcome the problem."

Aid Money

UN Secretary-General Ban Ki-moon said in a statement that several million dollars were available from the United Nations' emergency response funds, depending on the need.

Many foreign governments and international groups also pledged to help.

The United States offered $2.1 million and two U.S. Marine Corps transport planes arrived in Dhaka with medical supplies, said Chowdhury, the Bangladeshi army spokesman.

A U.S. military medical team was already in Bangladesh and two U.S. Navy ships, each carrying at least 20 helicopters and tons of supplies, would be made available if the Bangladesh government requested them, Secretary of State Condoleezza Rice said in a statement.

The European Union promised $2.2 million and the British government $5.1 million. Italy's Roman Catholic bishops conference said it would donate $2.9 million. The governments of Germany and France each pledged $730,000, Japan sent $318,000 in relief supplies, and the Philippines said it would provide a medical team.

Bangladesh is a densely populated nation sitting on a vast river delta. Storms batter its low-lying lands every year, often killing large numbers of people.

Only two people were killed in Bangladesh by the 2004 Indian Ocean tsunami.

Amazingly heavy rain

Now (8:18 AM) it's raining heavy from 6AM. As if it's like compensating for the last 15 dry days.
Night we had intermittent small showers
I used the word amazing because there's no cloud visible on the latest satellite pic.
Take a look...

Now the monthly rain stands at - 73.4mm (Nov. normal - 350 mm)

Forecast for the day:
Heavy rain will continue till mid-morning and after that there will be drizzles and showers in the evening.
This forecast is based on the latest satellite pic.

Monday, November 19, 2007

Rainy day ahead?

Yesterday night it was raining, Today morning we had light showers and after that it was cloudy thru the day.
Evening at around 5PM rain showers started again.
I think a LOW pressure trough is forming over the coast and the Rain rate might increase from Tonight.
Going by the rapid cloud formation over the coastal tamilnadu...and Bay, it's obvious that the North-East is alive, but for How many days???
Take a look at the latest satellite pic...

Today's Highs and Lows
Temperature: Hi: 29.7°C @ 10:53am ,Low: 22.9°C @ 12:01am
Humidity: Hi: 95% @ 3:21am ,Low: 72% @ 10:50am
Last 24hr rain: 7.8mm

Now take a look at the WIND direction.... for a surprise it shows that predominantly from WEST.

Latest satellite pic from weather.com


You can always follow this LINK to view various SATELLITE pics from weather.com, accuweather.com,IMD and more...