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首页> 外文期刊>Climate dynamics >Coupled atmosphere-ocean-vegetation simulations for modern and mid-Holocene climates: role of extratropical vegetation cover feedbacks
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Coupled atmosphere-ocean-vegetation simulations for modern and mid-Holocene climates: role of extratropical vegetation cover feedbacks

机译：现代和全新世中期气候的大气-海洋-植被耦合模拟：温带植被覆盖反馈的作用

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A full global atmosphere-ocean-land vegetation model is used to examine the coupled climate/vegetation changes in the extratropics between modern and mid-Holocene (6,000 year BP) times and to assess the feedback of vegetation cover changes on the climate response. The model produces a relatively realistic natural vegetation cover and a climate sensitivity comparable to that realized in previous studies. The simulated mid-Holocene climate led to an expansion of boreal forest cover into polar tundra areas (mainly due to increased summer/fall warmth) and an expansion of middle latitude grass cover (due to a combination of enhanced temperature seasonality with cold winters and interior drying of the continents). The simulated poleward expansion of boreal forest and middle latitude expansion of grass cover are consistent with previous modeling studies. The feedback effect of expanding boreal forest in polar latitudes induced a significant spring warming and reduced snow cover that partially countered the response produced by the orbitally induced changes in radiative forcing. The expansion of grass cover in middle latitudes worked to reinforce the orbital forcing by contributing a spring cooling, enhanced snow cover, and a delayed soil water input by snow melt. Locally, summer rains tended to increase (decrease) in areas with greatest tree cover increases (decreases); however, for the broad-scale polar and middle latitude domains the climate responses produced by the changes in vegetation are relatively much smaller in summer/fall than found in previous studies. This study highlights the need to develop a more comprehensive strategy for investigating vegetation feedbacks.
机译：完整的全球大气-海洋-陆地植被模型用于检验现代和全新世（中枢6,000年BP）之间温带气候/植被的耦合变化，并评估植被覆盖变化对气候响应的反馈。该模型产生了相对逼真的自然植被覆盖度和与以前的研究相当的气候敏感性。模拟的全新世中期气候导致北方森林覆盖率扩展到极地的苔原地区（主要是由于夏季/秋季温暖的增加）和中纬度草地覆盖率的扩展（由于温度季节性的增强与冬季寒冷和内部的结合）大洲的干燥）。模拟的北方森林向极扩展和草皮中纬度扩展与先前的模型研究一致。极地纬度上的北方森林扩张的反馈效应导致春季明显变暖和积雪减少，从而部分抵消了轨道引起的辐射强迫变化产生的响应。中纬度地区草皮层的扩张通过促进春季降温，增强雪层覆盖以及融雪融化而延迟了土壤水分输入，从而增强了轨道强迫。就局部而言，在树木覆盖率增加（减少）最大的地区，夏季雨量倾向于增加（减少）。然而，对于大范围的极地和中纬度地区，夏季/秋季由植被变化产生的气候响应比以前的研究要小得多。这项研究强调需要开发一种更全面的策略来调查植被反馈。

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