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By Nakamoto A., Sasanuma N.
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Extra resources for 3-Colorable Even Embeddings on Closed Surfaces
Holland, 1978, 1994) or nitrogen (Falkowski, 1997) is the principal limiting nutrient. Settling this issue is important because the concentrations of the two elements in seawater are controlled by different processes. Nitrogen levels reflect a balance between nitrogen fixation, the conversion of atmospheric N2 to nitrogen compounds accessible to organisms, and denitrification, the reduction of dissolved nitrate (the principal form of nitrogen in seawater) back to N2. Weathering of rocks is unimportant in the nitrogen cycle.
2001). Moulton et al. 1). The data of Millot et al. (2003) suggest that there is an enhancement of silicate weathering rate by vegetation in the Mackenzie River basin of Canada. They found that the composition of stream waters from the lowland plains are enriched in dissolved organic matter compared to the mountainous headwaters and that the silicate weathering rates of the plains rivers are 3–4 times faster than the mountain rivers. ) Millot et al. explain this difference by weathering rates to the higher content of chelating organic compounds in the less well-drained organic-rich soils of the plains.
This is an additional process that could affect atmospheric CO2, because oceanic and atmospheric CO2 are in exchange contact. Some carbon cycle models include this process as a major control on CO2 (Brady and Gislason, 1997; Sleep and Zahnle, 2001; Wallmann, 2001). The idea is simply that if atmospheric CO2 rises, the concentration in the ocean rises, and there is enhanced uptake by submarine basalt weathering. In this way the process serves as a negative feedback for stabilizing atmospheric CO2, and, in combination with silicate weathering on the continents, this would lead to greater dampening of CO2 fluctuations over time.
3-Colorable Even Embeddings on Closed Surfaces by Nakamoto A., Sasanuma N.