DOI: 10.5194/cp-13-1037-2017
Scopus记录号: 2-s2.0-85027562648
论文题名: Atmospheric circulation and hydroclimate impacts of alternative warming scenarios for the Eocene
作者: Carlson H. ; Caballero R.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2017
卷: 13, 期: 8 起始页码: 1037
结束页码: 1048
语种: 英语
英文摘要: Recent work in modelling the warm climates of the early Eocene shows that it is possible to obtain a reasonable global match between model surface temperature and proxy reconstructions, but only by using extremely high atmospheric CO2 concentrations or more modest CO2 levels complemented by a reduction in global cloud albedo. Understanding the mix of radiative forcing that gave rise to Eocene warmth has important implications for constraining Earth's climate sensitivity, but progress in this direction is hampered by the lack of direct proxy constraints on cloud properties. Here, we explore the potential for distinguishing among different radiative forcing scenarios via their impact on regional climate changes. We do this by comparing climate model simulations of two end-member scenarios: one in which the climate is warmed entirely by CO2 (which we refer to as the greenhouse gas (GHG) scenario) and another in which it is warmed entirely by reduced cloud albedo (which we refer to as the q low CO2-thin clouds/q or LCTC scenario) . The two simulations have an almost identical global-mean surface temperature and equator-to-pole temperature difference, but the LCTC scenario has g 1/4 g 11g % greater global-mean precipitation than the GHG scenario. The LCTC scenario also has cooler midlatitude continents and warmer oceans than the GHG scenario and a tropical climate which is significantly more El Niño-like. Extremely high warm-season temperatures in the subtropics are mitigated in the LCTC scenario, while cool-season temperatures are lower at all latitudes. These changes appear large enough to motivate further, more detailed study using other climate models and a more realistic set of modelling assumptions. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48891
Appears in Collections: 气候变化与战略
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Recommended Citation:
Carlson H.,Caballero R.. Atmospheric circulation and hydroclimate impacts of alternative warming scenarios for the Eocene[J]. Climate of the Past,2017-01-01,13(8)