古新世-始新世极热事件（PETM）说明了什么关于碳释放速率的教训？
What lesson about carbon-release rates does the Paleocene-Eocene Thermal Maximum teach?
PETM约5600万年前在数千年内向大气释放了相当于数万亿吨的碳，使全球温度骤升约5至8摄氏度。扎科斯等人指出海洋因此酸化、底栖有孔虫大量灭绝，与今日排放速率相比当年的释放其实相对缓慢。它提醒我们碳循环的临界点可能在快速扰动下被触发。
The PETM injected the equivalent of trillions of tons of carbon into the atmosphere within thousands of years about 56 million years ago, spiking global temperatures by roughly 5 to 8 degrees Celsius. Zachos and colleagues noted the oceans acidified and benthic foraminifera went extinct, yet today's release rate is far faster than then. It warns that carbon-cycle tipping points can be triggered by rapid perturbation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Zachos 等《Rapid acidification》（2005，Science）；McInerney 与 Wing《PETM》（2011，Annual Review of Earth and Planetary Sciences）
Zachos et al., Rapid acidification (2005, Science); McInerney & Wing, PETM (2011, ARA&PS)
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1126/science.1109004（复合著录按段核验：本标识只担保第一段
#PETM #碳释放 #古气候突变
温室气体为什么不简单随浓度线性增强温室效应？
Why don't greenhouse gases strengthen the greenhouse effect in a simple linear way with concentration?
特定波段的红外辐射一旦被气体强烈吸收到饱和，再增加该气体对穿透量的削减会递减，称作饱和效应。但上层大气因更稀薄而对新增气体仍敏感，使整体辐射强迫按对数而非线性增长。皮埃尔于贝尔在《行星气候原理》中讨论了这一细节。
Once a wavelength band is strongly absorbed to saturation, adding more gas yields diminishing reductions in transmitted radiation, the saturation effect. Yet the upper, thinner atmosphere still responds to added gas, so the radiative forcing grows logarithmically rather than linearly. Pierrehumbert discusses this nuance in Principles of Planetary Climate.
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
#温室气体饱和 #辐射强迫 #对数增长
全球碳循环的主要储库和通量有哪些？
What are the main reservoirs and fluxes of the global carbon cycle?
碳主要储存在大气、海洋、陆地植被与土壤以及岩石圈中，通过光合作用、呼吸、燃烧与溶解等过程交换。人类化石燃料排放每年向大气净增数十亿吨碳，打破了原有的自然平衡。施莱辛格在《生物地球化学》中系统梳理了各储库的相对规模。
Carbon resides mainly in the atmosphere, oceans, land vegetation and soils, and the geosphere, exchanging through photosynthesis, respiration, combustion, and dissolution. Human fossil-fuel emissions add billions of tons of carbon to the atmosphere each year, upsetting the natural balance. Schlesinger's Biogeochemistry lays out the relative sizes of these reservoirs.
难度 进阶 · 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 #碳储库 #温室气体
温室效应的物理机制是怎样的？
What is the physical mechanism of the greenhouse effect?
太阳短波辐射穿过大气到达地表，地表以红外长波形式再辐射热量。二氧化碳、水汽等气体吸收这些红外辐射并重新向各方向发射，使低层大气和地表升温。阿伦尼乌斯在1896年首次定量计算了二氧化碳对地表温度的影响。
Solar shortwave radiation passes through the atmosphere to the surface, which re-emits heat as infrared longwave radiation. Gases like carbon dioxide and water vapor absorb that infrared and re-emit it in all directions, warming the lower atmosphere and surface. Arrhenius first calculated carbon dioxide's effect on surface temperature quantitatively in 1896.
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
#温室效应 #红外辐射 #温室气体
大气气溶胶如何影响地球的能量平衡？
How do atmospheric aerosols affect Earth's energy balance?
气溶胶是悬浮的微小颗粒，一部分直接反射阳光使地表变冷，另一部分作为云凝结核改变云的反照率。人为硫酸盐气溶胶的冷却效应部分抵消了温室气体的增温，但其寿命短、空间分布不均。查尔森等人在1992年量化了人为气溶胶的气候强迫。
Aerosols are suspended fine particles; some reflect sunlight directly and cool the surface, while others act as cloud condensation nuclei altering cloud albedo. Anthropogenic sulfate aerosols cool somewhat, offsetting part of greenhouse warming, but they are short-lived and unevenly distributed. Charlson and colleagues quantified this aerosol forcing in 1992.
难度 进阶 · 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
#气溶胶 #辐射强迫 #云反照率