标题： 使用大面积陆地或海洋去除大气中的二氧化碳将改变地球反照率并影响气候 显示英文标题

标题： Removing Atmospheric Carbon Dioxide Using Large Land Or Ocean Areas Will Change Earth Albedo And Force Climate

摘要： 当地球的大面积表面被改变时，由于表面反射率的变化引起的辐射强迫可以引发气候变化。 然而，为了达到从大气中去除大量二氧化碳的必要规模，这对于缓解气候变化是相关的，增强岩石风化（ERW）需要应用于非常大的陆地面积。 同样，海洋二氧化碳去除（mCDR）必须改变很大一部分海洋表层水，才能对气候产生显著影响。 我们表明，与ERW或mCDR相关的表面反照率修改（SAM）很容易在数年甚至数十年内超过大气二氧化碳减少引起的辐射强迫。 反照率的小幅变化，如千分之几，其辐射影响相当于每公顷去除10吨碳。 通过ERW的SAM可能是降温或升温的。 我们确定了由于这些形式的CDR引起的辐射强迫所引发的许多问题。 显示英文摘要

摘要： When large surface areas of the Earth are altered, radiative forcing due to changes in surface reflectance can drive climate change. Yet to achieve the necessary scale to remove the substantial amounts of carbon dioxide from the atmosphere relevant for ameliorating climate change, enhanced rock weathering (ERW) will need to be applied to very large land areas. Likewise, marine carbon dioxide removal (mCDR) must alter a large fraction of the ocean surface waters to have a significant impact upon climate. We show that surface albedo modification (SAM) associated with ERW or mCDR can easily overwhelm the radiative forcing from the decrease of atmospheric CO2 over years or even decades. A change in albedo as small as parts per thousand has a radiative impact comparable to the removal of 10 tons of carbon per hectare. SAM via ERW can be either cooling or warming. We identify some of the many questions raised by radiative forcing due to these forms of CDR.