搜索结果: 16-24 共查到“国际动态 理学 oxygen”相关记录24条 . 查询时间(0.109 秒)
Low-oxygen 'dead zones' in North Pacific linked to past ocean warming
Low-oxygen dead zones North Pacific ocean warming
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2015/12/7
A new study has found a link between abrupt ocean warming at the end of the last ice age and the sudden onset of low-oxygen, or hypoxic, conditions that led to vast marine dead zones.Results of the re...
Variations in atmospheric oxygen levels shaped Earth’s climate through the ages
oxygen levels Earth’s climate
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2015/6/18
Variations in the amount of oxygen in Earth's atmosphere significantly altered global climate throughout the planet's history. Efforts to reconstruct past climates must include this previously overloo...
Warmer,lower-oxygen oceans will shift marine habitats
Warmer lower-oxygen oceans marine habitats
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2015/6/18
Modern mountain climbers typically carry tanks of oxygen to help them reach the summit. It’s the combination of physical exertion and lack of oxygen at high altitudes that creates one of the biggest c...
Smothered oceans: Extreme oxygen loss in oceans accompanied past global climate change
Smothered oceans Extreme oxygen loss oceans accompanied past global climate change
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2015/3/4
Seafloor sediment cores reveal abrupt, extensive loss of oxygen in the ocean when ice sheets melted roughly 10,000-17,000 years ago, according to a study from the University of California, Davis. The ...
Lack of oxygen delayed the rise of animals on Earth（图）
oxygen Earth animals
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2014/12/3
Geologists are letting the air out of a nagging mystery about the development of animal life on Earth.
Scientists have long speculated as to why animal species didn’t flourish sooner, once sufficient...
Lack of oxygen delayed the rise of animals on Earth
animals Earth oxygen
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2014/11/10
Geologists are letting the air out of a nagging mystery about the development of animal life on Earth.
Scientists have long speculated as to why animal species didn’t flourish sooner, once sufficient...
The ups and downs of early atmospheric oxygen（图）
atmospheric oxygen ups and downs
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2014/3/20
The period of extended low oxygen, which spanned from roughly 2 to less than 1 billion years ago, was a time of remarkable chemical stability in the Earth's oceans and atmosphere. A University of Cali...
Deep sea rocks point to early oxygen on earth（图）
Deep sea rocks early oxygen earth
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2009/12/21
Red jasper cored from layers 3.46 billion years old suggests that not only did the oceans contain abundant oxygen then, but that the atmosphere was as oxygen rich as it is today, according to geologis...
Geobiologists Solve "Catch-22 Problem" Concerning the Rise of Atmospheric Oxygen（图）
Environmental Changes green plants carbon dioxide
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2006/12/8
November 29, 2006，PASADENA, Calif.--Two and a half billion years ago, when our evolutionary ancestors were little more than a twinkle in a bacterium's plasma membrane, the process known as photosynthe...