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首页> 外文期刊>Climate dynamics >Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO_2 in response to a collapse of the North Atlantic thermohaline circulation
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Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO_2 in response to a collapse of the North Atlantic thermohaline circulation

机译：模拟响应北大西洋热盐环流崩溃的植被分布，土地碳储量和大气CO_2的变化

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It is investigated how abrupt changes in the North Atlantic (NA) thermohaline circulation (THC) affect the terrestrial carbon cycle. The Lund-Potsdam-Jena Dynamic Global Vegetation Model is forced with climate perturbations from glacial freshwater experiments with the ECBILT-CLIO ocean-atmosphere-sea ice model. A reorganisation of the marine carbon cycle is not addressed. Modelled NA THC collapses and recovers after about a millennium in response to prescribed freshwater forcing. The initial cooling of several Kelvin over Eurasia causes a reduction of extant boreal and temperate forests and a decrease in carbon storage in high northern latitudes, whereas improved growing conditions and slower soil decomposition rates lead to enhanced storage in mid-latitudes. The magnitude and evolution of global terrestrial carbon storage in response to abrupt THC changes depends sensitively on the initial climate conditions. These were varied using results from time slice simulations with the Hadley Centre model HadSM3 for different periods over the past 21 kyr. Changes in terrestrial storage vary between -67 and + 50 PgC for the range of experiments with different initial conditions. Simulated peak-to-peak differences in atmospheric CO_2 are 6 and 13 ppmv for glacial and late Holocene conditions. Simulated changes in δ~(13)C are between 0.15 and 0.25 per thousand. These simulated carbon storage anomalies during a NA THC collapse depend on their magnitude on the CO_2 fertilisation feedback mechanism. The CO_2 changes simulated for glacial conditions are compatible with available evidence from marine studies and the ice core CO_2 record. The latter shows multi-millennial CO_2 variations of up to 20 ppmv broadly in parallel with the Antarctic warm events Al to A4 in the South and cooling in the North.
机译：研究了北大西洋（NA）热盐循环（THC）的突然变化如何影响陆地碳循环。 Lund-Potsdam-Jena动态全球植被模型是由ECBILT-CLIO海洋-大气-海冰模型的冰川淡水实验产生的气候扰动引起的。未解决海洋碳循环的重组问题。模拟的NA THC会在约一千年后崩溃并响应规定的淡水强迫而恢复。欧亚大陆上几个开尔文河的初始冷却导致北部高寒地区现存的北方和温带森林减少，碳储量减少，而生长条件的改善和土壤分解速度的降低导致中纬度地区储量的增加。应对THC突变而导致的全球陆地碳储量的大小和演变敏感地取决于初始气候条件。使用过去21年内不同时间段的Hadley Center模型HadSM3的时间片模拟结果可以改变这些结果。对于具有不同初始条件的实验范围，地面存储的变化范围在-67至+ 50 PgC之间。在冰川期和全新世时期，模拟的大气CO_2峰峰值差异分别为6和13 ppmv。 δ〜（13）C的模拟变化在0.15和0.25 /千之间。在NA THC崩溃期间，这些模拟的碳储量异常取决于它们对CO_2施肥反馈机制的影响。针对冰川条件模拟的CO_2变化与海洋研究和冰芯CO_2记录中的可用证据相吻合。后者与南部的南极暖事件A1至A4以及北部的降温大致平行，显示了高达20 ppmv的多千年CO_2变化。

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