搜索结果: 16-30 共查到“国际动态 大气化学”相关记录41条 . 查询时间(1.865 秒)
How Ice In Clouds Is Born（图）
Ice Clouds Born
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2017/11/24
Something almost magical happens when you put a tray full of sloshing, liquid water into a freezer and it comes out later as a rigid, solid crystal of ice. Chemists at the University of Utah have pull...
Study casts doubt on warming implications of brown carbon aerosol from wildfires（图）
warming implications brown carbon aerosol wildfires
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2017/10/25
As devastating wildfires continue to rage in the western U.S. and Canada, a team of environmental engineers at Washington University in St. Louis have discovered that light-absorbing organic particula...
Ammonia Emissions Unlikely To Be Causing Extreme China Haze（图）
Ammonia Emissions Unlikely China Haze
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2017/10/25
As China struggles to find ways to remedy the noxious haze that lingers over Beijing and other cities in the winter, researchers from Georgia Institute of Technology have cast serious doubt on one pro...
Researchers Use Novel Microreactor To Study Formation Of Methane Hydrate,An Icy Prison For Key Greenhouse Gas（图）
Researchers Novel Microreactor Methane Hydrate An Icy Prison Greenhouse Gas
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2017/9/5
Researchers at the NYU Tandon School of Engineering are using a novel means of studying how methane and water form methane hydrate that allows them to examine discrete steps in the process faster and ...
世界首座直接从大气中捕集二氧化碳装置在瑞士投入运行
世界 大气 二氧化碳装置 瑞士
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2017/6/26
据瑞士《每日导报》报道，世界首座从大气中直接捕集二氧化碳实用装置在瑞士苏黎世投入运行。该装置建设在位于苏黎世近郊小镇Hinwil的一座垃圾焚烧厂的厂房楼顶，占地面积约90平方米，主体部分是一座由18个空气吸入单元构成的空气收集装置，其中装填着由多孔植物纤维类物质形成的过滤器，可吸附空气中50%的二氧化碳。过滤器被二氧化碳饱和后，可利用垃圾焚烧产生的废热加热，在100摄氏度条件下使吸附的二氧化碳脱离...
Earth’s atmosphere more chemically reactive in cold climates
Earth’s atmosphere chemically reactive cold climates
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2017/7/20
Unseen in the air around us are tiny molecules that drive the chemical cocktail of our atmosphere. As plants, animals, volcanoes, wildfires and human activities spew particles into the atmosphere, som...
JILA Team Spots Elusive Intermediate Compound in Atmospheric Chemistry
JILA Team Spots Elusive Intermediate Compound Atmospheric Chemistry
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2016/11/4
JILA physicists and colleagues have identified a long-missing piece in the puzzle of exactly how fossil fuel combustion contributes to air pollution and a warming climate. Performing chemistry experim...
美国宇航局（NASA）研究发现太阳超级耀斑或有助地球早期生命存活
美国宇航局 太阳超级耀斑 地球早期生命存活
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2016/6/2
是太阳超级耀斑触发了最初的地球大气化学变化吗？根据美国国家航空航天局（NASA）科学家2016年5月23日在线发表于《自然·地球科学》上的一则研究，太阳年轻时的活跃可能有助于给早期地球生命提供所需成分和气候。氮是地球生命必需的基本组成，但在地球早期，氮可能只是以氮气形式存在于地球大气中，而且是一种很少参加化学反应的惰性物质。分解大气中的氮分子是一个高耗能过程，但只有这样才能让生物可以更好地利用重组...
Chemical weathering controls erosion rates in rivers
Chemical weathering controls erosion rates rivers
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2016/4/25
Chemical weathering can control how susceptible bedrock in river beds is to erosion, according to new research. In addition to explaining how climate can influence landscape erosion rates, the r...
For the first time scientists have looked at the net balance of the three major greenhouse gases—carbon dioxide, methane, and nitrous oxide—for every region of Earth’s landmasses. They found surprisin...
Atmospheric Sulfate Particles Reduced,but as Acidic as Ever（图）
Atmospheric Sulfate Particles Reduced Acidic as Ever
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2016/3/2
Something very similar is happening in the atmosphere. Acidic sulfur emissions from power plants have been rapidly declining over the past decade, and the neutralizing base – ammonia – is emitted from...
Fires Burning in Africa&Asia Cause High Ozone in Tropical Pacific（图）
Fires Africa Asia High Ozone Tropical Pacific
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2016/2/22
While efforts to limit ozone precursor emissions tend to focus on industrial activities and fossil fuel combustion in the United States and China, a new University of Maryland-led study suggests that ...
Mercury-laden fog swirls over coastal California,scientists find
Mercury-laden fog swirls coastal California scientists
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2015/9/9
What do the roof of a building in a West Coast redwood forest, a bluff in California chaparral, and a research vessel in Monterey Bay have in common?
They're often draped in tendrils of fog. That mak...
近日，美国地质调查局和哈佛大学的一项研究表明，全球气候变化引发的一系列看似无关的变化将对重金属汞在全球范围的运移和分布产生显著影响。其中，气候变化导致的升温和相对减弱的空气对流将影响汞在大气中的寿命和沉降模式；频度降低但强度增大的暴风雨导致的水土流失将释放更多原先固化在土壤中的汞，这些汞到达地表水体后经细菌作用将生成神经毒性更大的甲基汞；气候变化导致森林火灾的频度强度上升，地表覆盖降低也将释放更多...