Land dominates the regional response to CO2 direct radiative forcing
Land dominates the regional response to CO2 direct radiative forcing
复制标题
陆地对二氧化碳直接辐射强迫的区域响应占主导地位
DOI：
10.1002/2016gl071368
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发表时间：
2016
影响因子：
5.2
通讯作者：
A. Voigt
中科院分区：
文献类型：
--
作者：
T. Shaw;A. Voigt
在大气环流模式（AGCMs）中，直接辐射强迫（固定海面温度下二氧化碳增加）是一个不完善的概念，因为陆地温度不是固定的。在这里，对直接辐射强迫的响应被分解为海洋和陆地上增加的CO2，使用具有空间依赖性CO2的AGCM。陆地对海洋的反应基本上是线性的。与以往的研究一致，海洋直接辐射强迫降低了海洋平均外向长波辐射、降水和热带环流强度；然而，它不能解释区域对直接辐射强迫的响应。陆地上二氧化碳的增加通过陆地上的能量输入主导了区域响应，例如，在没有云和水蒸气掩蔽和罗斯比波遥相关的沙漠上空。这一机制在一系列气候扰动中起作用，包括二氧化碳的减少。以前涉及直接辐射强迫和间接海面温度变暖的AGCM分解必须重新解释，以包括陆地上二氧化碳增加的重要性。
In Atmospheric General Circulation Models (AGCMs) direct radiative forcing (increased CO2 with fixed sea surface temperature) is an imperfect concept because land temperatures are not fixed. Here the response to direct radiative forcing is decomposed into increased CO2 over ocean and land using an AGCM with spatially dependent CO2. The land versus ocean response is mostly linear. Consistent with previous work, ocean direct radiative forcing decreases ocean‐averaged outgoing longwave radiation, precipitation, and tropical circulation intensity; however, it cannot explain the regional response to direct radiative forcing. Increased CO2 over land dominates the regional response via energy input over land, e.g., over deserts where there is no cloud and water vapor masking and a Rossby wave teleconnection. This mechanism operates across a range of climate perturbations, including decreased CO2. Previous AGCM decompositions involving direct radiative forcing and indirect sea surface temperature warming must be reinterpreted to include the importance of increased CO2 over land.