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Deep sea algae connect ancient climate, carbon dioxide and vegetation
June 23, 2005New Haven, Conn. - Assistant Professor Mark Pagani in the Department of Geology and Geophysics at Yale and his colleagues mapped the first detailed history of atmospheric carbon dioxide between 45-25 million years ago based on stable isotopes of carbon in a National Science Foundation study reported in Science Express.
"Through the energy we consume, each of us makes a contribution to increasing greenhouse gasses, such as carbon dioxide and methane, in the Earth's atmosphere," said Pagani. "To understand the implications of these actions for the future, scientists look to the past to gain a better understanding of Earth's climate system under high greenhouse gas conditions." The findings were based on calibration of carbon-containing compounds produced by ancient sea surface algae that were recently isolated in deep sea drill cores.
The data indicates that between 45-34 million years ago the atmospheric carbon dioxide level was up to five times greater than today, with a sharp decrease and then stabilization to near modern day levels between 34-25 million years ago.
During the early part of the Paleogene Period, from 65-34 million years ago, global climates were much warmer than today with very little ice present at the poles. The boundary of the Oligocene and Eocene Epochs 33.7 million years ago was marked by rapid global cooling and the formation of large continental ice sheets on the Antarctic.
"Before this study, the relationship between the global climate and the concentration of carbon dioxide in the atmosphere during the late Eocene and Oligocene was largely unknown," said Pagani, who is recognized for his reconstruction of past atmospheric carbon dioxide levels between 25 million and eight million years ago.
They also present intriguing evidence that the sharp drop in carbon dioxide level, between 33-25 million years ago, prompted the origin of economically important land plants that are sensitive to atmospheric carbon dioxide levels, such as corn and sugarcane.
"The onset and stabilization of ice sheets at the same time as a decline in carbon dioxide illustrates the importance of atmospheric carbon dioxide as an agent of both climate and biological change," Pagani said.
Collaborators were Brett Tipple from Yale, James C. Zachos and Stephen Bohaty at University of California, Santa Cruz and Katherine Freeman at Pennsylvania State.
Yale University
During the early part of the Paleogene Period, from 65-34 million years ago, global climates were much warmer than today with very little ice present at the poles. The boundary of the Oligocene and Eocene Epochs 33.7 million years ago was marked by rapid global cooling and the formation of large continental ice sheets on the Antarctic.
"Before this study, the relationship between the global climate and the concentration of carbon dioxide in the atmosphere during the late Eocene and Oligocene was largely unknown," said Pagani, who is recognized for his reconstruction of past atmospheric carbon dioxide levels between 25 million and eight million years ago.
They also present intriguing evidence that the sharp drop in carbon dioxide level, between 33-25 million years ago, prompted the origin of economically important land plants that are sensitive to atmospheric carbon dioxide levels, such as corn and sugarcane.
"The onset and stabilization of ice sheets at the same time as a decline in carbon dioxide illustrates the importance of atmospheric carbon dioxide as an agent of both climate and biological change," Pagani said.
Collaborators were Brett Tipple from Yale, James C. Zachos and Stephen Bohaty at University of California, Santa Cruz and Katherine Freeman at Pennsylvania State.
Yale University
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The Carbon Dioxide Syndrome by Jennifer Stark and Russell Stark (Author) Learn why changing your breathing can improve your health and well-being through the Butekyo Method. This method will help those with sleep disorders, panic attacks, allergies, hypertension and asthma. |
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First Alert CO400 Battery Powered Carbon Monoxide Alarm by First Alert Carbon monoxide (CO) is the leading cause of accidental poisoning deaths in America, yet many people don't know they are suffering from CO poisoning until its too late. Since symptoms of CO poisoning are like the flu, you might not even know you're in danger at first. That's why a carbon monoxide alarm is an excellent way to protect your family. It can detect the CO you can't see, smell or taste in the air. The First Alert CO400 carbon monoxide alarm uses an electrochemical carbon monoxide sensor-the most accurate technology available. The permanent sensor lasts up to five years. It is powered by two AA replaceable alkaline batteries giving you peace of mind even during power outages. The test/silence button both silences the alarm and allows you to test its functionality. The unit... |
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Carbon Dioxide and the Climate Crisis: Reality or Illusion? Also With: CO2Science (Producer) Al Gore calls the host of negative consequences he predicts will accompany the on-going rise in the air's CO2 concentration "a planetary emergency - a crisis that threatens the survival of our civilization and the habitability of the earth." James Hansen similarly claims that the earth "is close to dangerous climate change, to tipping points of the system with the potential for irreversible deleterious effects," and he contends that "ignoring the climate problem at this time, for even another decade, would serve to lock in future catastrophic climatic change." Do these dire contentions reflect reality? Or do they portray but a marvelously-crafted and hugely-effective illusion? Carbon Dioxide and the Climate Crisis: Reality or Illusion? explores this perplexing problem through an... |
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Carbon Dioxide (CO2) Cylinder 10 Lbs This cylinder is able to hold 10 lbs of CO2. It is constructed of light weight aluminum with matte aluminum finish. CO2 Cylinders are shipped empty. Be sure to see the other draft beer products sold by Learn To Brew LLC. |
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First Alert Smoke and Carbon Monoxide Alarm - SC01CN3 by First Alert First Alert SCO1CN3 smoke and carbon monoxide detector uses ionization method of smoke detection. It features a test button and a silence button that temporarily quiets both the carbon monoxide and smoke alarms. When battery is low, the warning "chirp" and light flashes. The alarm makes different horn sounds and light flash patterns for carbon monoxide and smoke. |
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Fire Extinguisher Carbon Dioxide 5 Lb. by Global Industrial KIDDE CARBON DIOXIDE EXTINGUISHER Effective for Class B and C fires. Environmentally safe, Co2 gas dissipates quickly leaving no residue and won't contaminate food, valuable materials or electronics. Seamless aluminum cylinder has a durable epoxy paint finish. Long-lasting nickelchrome plated brass valve with stainless steel handle and lever. Includes a heavy-duty wall hanger. 5 year warranty. Non-Returnable. 5 pounds UL Rating: 5B:C |
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Kidde 900-0107 Plug-In Carbon Monoxide Alarm by Kidde Safety 110V Non-Digital AC Carbon Monoxide Alarm With Direct Plug Alarm Only 85 Decibel Alarm Test Reset Button To Reset Alarm Advanced Electrochemical Sensor 5 Year Warranty UL Listed To 2,034 Standard Clam Shell |
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Carbon Dioxide Incubator Accessories for Isotemp/Thermo Scientific NAPCO Models; Roller Base by Thermo Scientific Forma Roller Base, Incubator Accessory; For Isotemp DH and NAPCO 8000 Series DH CO2 Incubators; with locking casters and leveling feet | |
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^CarboLime Carbon Dioxide Absorbent - Pre-packaged cartridge, 2.5 lb (1.13 kg) Min.Order is 1 CS ( 12 Each / Case; ) by Medline CarboLime is a granular solar lime absorbent for the efficient removal of carbon dioxide from closed and semi-closed patient breathing circuits. Contains no potassium hydroxide. Minimum dust levels with the benefits of high surface area and graded particle size. Low bulk density. Low risk of carbon monoxide formation due to good reisistance of dry gas desiccation. Low odor due to reliable control of indicator dye concenntration. Carb-O-Lime Absorbent Granules Efficiently Remove Carbon Dioxide 12 Each / Case; |
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