Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys)
Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys)
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南极湖泊的碳封存和释放：维达湖和西邦尼湖（麦克默多干谷）
DOI：
10.1007/s10498-012-9184-1
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发表时间：
--
影响因子：
1.6
通讯作者：
Fritsen C.H.
中科院分区：
文献类型：
--
作者：
Marion G.M;Kenig F;Murray A.E;Doran P.T;Wagner B. ;Fritsen C.H.
南极许多湖泊常年被冰层覆盖，导致湖泊无机碳含量高。本文的目的是评估和比较维达湖（维多利亚谷）和西邦尼湖（泰勒谷），麦克默多干谷（东南极洲）的两个湖泊的盐水和CO2化学，及其在全球变暖的潜在后果。现有的地球化学模型（FREZCHEM-15）用于将测得的摩尔浓度转换为FREZCHEM模型所需的摩尔浓度，该模型增加了一种新的算法，将测得的DIC转换为FREZCHEM模型所需的碳酸盐碱度。虽然存在关于冰雪覆盖的泰勒谷湖泊（如West Lake Bonney）的相当广泛的地球化学信息，但对于最近取样的冰厚大于25 m的维达湖卤水，信息有限。维达湖盐水在现场pH值（6.20）下的模型计算pCO 2 = 0.60 bar;西湖邦尼在现场pH值（5.46）下的模型计算pCO 2 = 5.23 bar。尽管西邦尼湖的大气CO2过饱和度很高，但气体水合物CO2·6 H2O仍显着不饱和，除非这些气体水合物在沉积层深处或在较低温度或较高压力下形成的亚稳定状态。由于较低的温度，维达湖可以在比西邦尼湖更低的pCO 2值下开始形成CO2·6 H2O;但两个湖的气体水合物CO2·6 H2O明显不饱和。对于这两个湖泊，从目前的零度以下温度（维达湖为−13.4 °C，邦尼西湖为−4.7 °C）到10 °C的全球变暖模拟表明，当温度上升到0 °C以上时，溶解相碳的主要损失是二氧化碳气体和碳酸盐矿物，常年冰盖将消失。这些南极二氧化碳源对未来全球变暖的重要性还有待观察。但最近的一篇论文表明，由于大约1万年前的冰川消退，甲烷在大气中的浓度增加了。因此，冰湖释放的二氧化碳可能会在未来成为大气中的气体。
Perennial ice covers on many Antarctic lakes have resulted in high lake inorganic carbon contents. The objective of this paper was to evaluate and compare the brine and CO2chemistries of Lake Vida (Victoria Valley) and West Lake Bonney (Taylor Valley), two lakes of the McMurdo Dry Valleys (East Antarctica), and their potential consequences during global warming. An existing geochemical model (FREZCHEM-15) was used to convert measured molarity into molality needed for the FREZCHEM model, and this model added a new algorithm that converts measured DIC into carbonate alkalinity needed for the FREZCHEM model. While quite extensive geochemical information exists for ice-covered Taylor Valley lakes, such as West Lake Bonney, only limited information exists for the recently sampled brine of >25 m ice-thick Lake Vida. Lake Vida brine had a model-calculated pCO2= 0.60 bars at the field pH (6.20); West Lake Bonney had a model-calculated pCO2= 5.23 bars at the field pH (5.46). Despite the high degree of atmospheric CO2supersaturation in West Lake Bonney, it remains significantly undersaturated with the gas hydrate, CO2·6H2O, unless these gas hydrates are deep in the sediment layer or are metastable having formed under colder temperatures or greater pressures. Because of lower temperatures, Lake Vida could start forming CO2·6H2O at lower pCO2values than West Lake Bonney; but both lakes are significantly undersaturated with the gas hydrate, CO2·6H2O. For both lakes, simulation of global warming from current subzero temperatures (−13.4 °C in Lake Vida and −4.7 °C in West Lake Bonney) to 10 °C has shown that a major loss of solution-phase carbon as CO2gases and carbonate minerals occurred when the temperatures rose above 0 °C and perennial ice covers would disappear. How important these Antarctic CO2sources will be for future global warming remains to be seen. But a recent paper has shown that methane increased in atmospheric concentration due to deglaciation about 10,000 years ago. So, CO2release from ice lakes might contribute to atmospheric gases in the future.
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影响因子：
3.7
作者：
Brosius, L. S.;Anthony, K. M. Walter;Meyer, H.
通讯作者：
Meyer, H.
影响因子：
3.2
作者：
G. Marion;J. Kargel;D. Catling;J. Lunine
通讯作者：
J. Lunine
调整摩尔模型的摩尔数据（无密度）
DOI：
10.1016/j.cageo.2006.10.009
发表时间：
2007
期刊：
Comput. Geosci.
影响因子：
--
作者：
G. Marion
通讯作者：
G. Marion
使用 FREZCHEM 进行冷水行星地球化学
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
G. Marion;J. Kargel
通讯作者：
J. Kargel
影响因子：
1.6
作者：
Marion, GM
通讯作者：
Marion, GM