Carbon Dioxide in Earth's Atmosphere
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High Quality Content by WIKIPEDIA articles! Carbon dioxide (CO2) forms approximately 0.04% of the nominal 5,000,000 gigatonnes of gas and aerosols that comprise the Earth's atmosphere. It is essential to photosynthesis in plants and other photoautotrophs, and is also a prominent greenhouse gas. In two thousand and nine, the CO2 global average concentration in Earth's atmosphere was about 0.0387% by volume, or 387 parts per million by volume (ppmv). This is 103 ppmv (36%) above the 1832 antarctic ice core levels of 284 ppmv. There is an annual fluctuation of about 3 9 ppmv which roughly follows…mehr

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High Quality Content by WIKIPEDIA articles! Carbon dioxide (CO2) forms approximately 0.04% of the nominal 5,000,000 gigatonnes of gas and aerosols that comprise the Earth's atmosphere. It is essential to photosynthesis in plants and other photoautotrophs, and is also a prominent greenhouse gas. In two thousand and nine, the CO2 global average concentration in Earth's atmosphere was about 0.0387% by volume, or 387 parts per million by volume (ppmv). This is 103 ppmv (36%) above the 1832 antarctic ice core levels of 284 ppmv. There is an annual fluctuation of about 3 9 ppmv which roughly follows the Northern Hemisphere's growing season. The Northern Hemisphere dominates the annual cycle of CO2 concentration because it has much greater land area and plant biomass than the Southern Hemisphere. Concentrations peak in May as the Northern Hemisphere spring greenup begins and reach a minimum in October when the quantity of biomass undergoing photosynthesis is greatest.