自然界把大气里的二氧化碳“收走”一般需要多久，和现在的排放比如何？
How long does nature normally take to remove atmospheric CO2, versus today's emissions?
自然碳循环靠海洋吸收和岩石风化等过程，把多余的碳慢慢移走要以万年计；而人类在短短两百年里排出了大自然需要很久才能消纳的量，所以浓度飙升。
The natural carbon cycle removes excess CO2 via ocean uptake and rock weathering over tens of thousands of years; humans emitted in two centuries what nature would take far longer to absorb, so concentrations spike.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#碳循环 #时间尺度
什么是“氮级联”？人类活动如何改变了全球氮循环？
What is the nitrogen cascade, and how have human activities altered the global nitrogen cycle?
氮级联指活性氮在环境中依次引发一系列连锁效应：哈伯法固氮与化石燃料燃烧使人为活性氮激增，经淋溶造成水体富营养化、经反硝化与硝化释放氧化亚氮（强温室气体）并破坏平流层臭氧。人为固氮现已超过自然陆地固氮总量。
The nitrogen cascade is the sequence of linked effects of reactive nitrogen in the environment: Haber-Bosch fixation and fossil-fuel combustion have surged reactive N, causing eutrophication via leaching and emitting N₂O (a potent greenhouse gas) through denitrification and nitrification, while harming stratospheric ozone. Human fixation now exceeds natural terrestrial fixation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#氮级联 #活性氮 #富营养化
硅酸盐岩风化如何长期调节大气 CO₂ 与气候（硅酸盐风化反馈）？
How does silicate rock weathering regulate atmospheric CO₂ and climate over long timescales (the silicate weathering feedback)?
大气 CO₂ 溶于雨水形成弱酸，化学风化硅酸盐岩消耗 CO₂ 并随河流以碳酸氢盐入海、最终固结成碳酸盐岩，实现长期碳移除。升温加速风化、增强碳消耗，从而冷却气候；降温则减弱，构成稳定气候的负反馈，时间尺度以万年计。
Atmospheric CO₂ dissolves in rain to form weak acid that weathers silicate rocks, consuming CO₂ and carrying bicarbonate to the sea where it becomes carbonate rock—long-term carbon removal. Warming speeds weathering and carbon drawdown, cooling the climate; cooling slows it, a negative feedback stabilizing climate on timescales of tens of thousands of years.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《自然·地球科学》(Nature Geoscience) 长期碳循环研究
Nature Geoscience, long-term carbon cycle
#硅酸盐风化 #碳移除 #负反馈
海水的锶同位素比值87Sr/86Sr在地质历史上反复升降,研究者凭什么据此重建大陆风化强度的变迁?
The seawater 87Sr/86Sr ratio has swung up and down through geologic time — on what basis do researchers use it to reconstruct changing continental weathering intensity?
海水中的锶来自两个同位素组成迥异的端元:年轻玄武质洋壳经热液蚀变提供的低比值锶,以及古老大陆硅酸盐岩风化输送的高比值锶;锶在海水中滞留时间远超混合时间,故大洋中比值处处均一。沉积记录里比值的抬升通常指向大陆风化通量增强,从而把喜马拉雅造山等构造事件与晚新生代气候变冷串联起来。
Oceanic strontium arrives from two isotopically distinct reservoirs: unradiogenic Sr leached from young basaltic crust by seafloor hydrothermal circulation, and radiogenic Sr shed by weathering of old continental silicates. Because Sr's ocean residence time far exceeds mixing time, the ratio is uniform worldwide, so rises recorded in marine sediments point to enhanced continental weathering fluxes, linking orogenic events such as the Himalayan uplift to late Cenozoic cooling.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
McArthur、Howarth 与 Bailey 撰写的 Strontium Isotope Stratigraphy,载于 Gradstein 等主编的 The Geologic Time Scale 2012(Elsevier)
McArthur, J.M., Howarth, R.J. & Bailey, T.R., Strontium Isotope Stratigraphy, in Gradstein, F.M. et al. (eds.), The Geologic Time Scale 2012, Elsevier
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1016/c2011-1-08249-8：The Geologic Time Sc
#锶同位素 #大陆风化
全球“遗失的碳汇”（missing sink）问题指什么？陆地与海洋如何分担？
What is the missing carbon sink problem, and how do land and ocean share it?
根据碳收支，人为排放的部分 CO₂ 未在已知通量中解释清楚，差额即“遗失的碳汇”。大气反演与清查表明，陆地（植被与土壤）与海洋大致各吸收约四分之一的人为排放，其余留存大气。厘清其分布对预测变暖至关重要。
In the carbon budget, some anthropogenic CO₂ is unaccounted for by known fluxes—the missing sink. Atmospheric inversions and inventories show land (vegetation and soils) and ocean each absorb roughly a quarter of emissions, the rest staying in the atmosphere. Resolving its distribution is vital for projecting warming.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#遗失碳汇 #碳收支 #大气反演
什么是甲烷的“气候反馈”？永冻土融化为何受关注？
What is methane's climate feedback, and why is permafrost thaw a concern?
甲烷的温室效应约为 CO₂ 的 80 余倍（20 年尺度）。北极与高纬永冻土中封存大量有机碳，升温融化后微生物分解释放 CH₄ 与 CO₂，进一步增温，形成正反馈，可能加速气候变化。
Methane's greenhouse effect is over 80 times that of CO₂ on a 20-year basis. Arctic permafrost holds vast organic carbon; warming thaws it, and microbial decay releases CH₄ and CO₂, warming further—a positive feedback that could accelerate climate change.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#甲烷 #永冻土 #正反馈
河口为何既是碳的“源”也可能是碳的“汇”？
Why can an estuary act as both a source and a sink of carbon?
河口接收河流输入的陆源有机碳并支持本地高生产力，部分碳埋入沉积物成为“汇”；但同时水体呼吸与细菌分解又向大气释放 CO₂ 与 CH₄，使其成为“源”。净通量取决于径流、潮汐混合与初级生产力的平衡。
Estuaries receive terrestrial organic carbon and support local productivity, burying some in sediments as a sink, while respiration and bacterial decay release CO₂ and CH₄ to the atmosphere as a source. The net flux depends on the balance of runoff, tidal mixing, and primary production.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#河口碳 #源汇 #碳埋藏
海洋是怎么慢慢“吃掉”大气里的二氧化碳的？
How does the ocean slowly 'eat' atmospheric CO2?
海表水和空气交换，二氧化碳溶入后被浮游生物利用，死后遗体沉入深海，把碳锁在海底，这叫生物泵；整个过程把碳从大气搬到深海需要很久。
Surface water exchanges with the air; dissolved CO2 is used by plankton whose remains sink, locking carbon in the deep sea—the biological pump—which moves carbon from air to abyss over a long time.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#生物泵 #碳汇
什么是生物地球化学循环？碳、氮、磷循环的核心差异是什么？
What is a biogeochemical cycle, and what is the core difference among carbon, nitrogen, and phosphorus cycles?
生物地球化学循环是元素在生物圈、岩石圈、水圈与大气圈间迁移转化的过程。碳与氮有显著的气态库（CO₂、N₂），而磷几乎没有气态阶段，主要在岩石—土壤—水体间循环，因此磷常成为淡水与近岸系统的限制性营养盐。
Biogeochemical cycles are the pathways by which elements move among the biosphere, lithosphere, hydrosphere, and atmosphere. Carbon and nitrogen have major gaseous reservoirs (CO₂, N₂), whereas phosphorus has essentially no gaseous phase and cycles mainly through rock–soil–water, so it often limits freshwater and coastal systems.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#生物地球化学循环 #碳循环 #磷限制
南大洋在全球海洋碳汇中为何既关键又脆弱？
Why is the Southern Ocean both critical and vulnerable in the global ocean carbon sink?
南大洋吸收了约一半人为 CO₂ 的海洋吸收量，靠下沉的冷水将碳带入深海长期封存。但南极绕极流与冰架融化带来的淡水分层减弱了这种下沉，若效率下降，更多 CO₂ 将滞留大气，加剧变暖。
The Southern Ocean takes up roughly half of all anthropogenic CO₂ absorbed by the oceans, sending carbon to the deep via sinking cold water. But freshwater from ice-shelf melt and the Antarctic Circumpolar Current weaken this sinking; if efficiency drops, more CO₂ stays in the atmosphere and warming accelerates.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#南大洋 #碳汇 #南极绕极流
碳酸盐—硅酸盐风化循环为何被称作地球气候的长期恒温器?它靠哪些环节在大时间尺度上稳住大气二氧化碳?
Why is the carbonate–silicate weathering loop called Earth's long-term thermostat, and through which steps does it hold atmospheric carbon dioxide steady over deep time?
大气中的二氧化碳溶入雨水形成碳酸,侵蚀硅酸盐岩石,释放的钙、镁离子被河流送入海洋并沉淀为碳酸盐沉积。板块俯冲与火山脱气随后把这些碳重新归还给大气。温度升高会加快风化、增强二氧化碳消耗,温度降低则相反,这一负反馈在数十万到数百万年尺度上压制了气候的大幅漂移。
Atmospheric CO2 dissolves in rainwater as carbonic acid, which attacks silicate rock; the freed calcium and magnesium ride rivers to the ocean and settle as carbonate sediments. Subduction and volcanic degassing later hand that carbon back to the atmosphere. Because warmer conditions speed up weathering and draw CO2 down faster while cooler ones slow it, the feedback loop suppresses large climate swings on timescales of hundreds of thousands to millions of years.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Berner、Lasaga 与 Garrels 1983 年发表于《American Journal of Science》的碳酸盐—硅酸盐地球化学循环模型
R. A. Berner, A. C. Lasaga, R. M. Garrels, The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years, American Journal of Science, 1983
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.2475/ajs.283.7.641：The carbonate-silicate
#化学风化 #碳循环
沿海“死区”的面积为何常随季节周期性涨落？
Why does the area of coastal dead zones often rise and fall seasonally?
春季农业径流将大量氮磷送入河口，夏季水温升高与层化增强抑制了氧气垂向混合，底部耗氧加剧，缺氧区在夏秋扩张；秋冬混合增强、营养输入减少后面积又收缩。密西西比河口的墨西哥湾缺氧区即呈此年度循环。
Spring agricultural runoff delivers abundant nitrogen and phosphorus to estuaries; summer warming and stronger stratification curb vertical oxygen mixing while bottom respiration consumes it, expanding hypoxia in late summer. With autumn–winter mixing and less nutrient input the zone shrinks—the Gulf of Mexico hypoxia shows this annual cycle.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#缺氧区 #季节循环 #水体层化