Arctic greening can cause earlier seasonality of Arctic amplification

作者：Chae Yoojeong; Kang Sarah M^*; Jeong Su Jong; Kim Baekmin; Frierson Dargan M W

来源：Geophysical Research Letters, 2015, 42(2): 536-541.

DOI：10.1002/2014GL061841

• Arctic greening
• Arctic amplification
• seasonality
• CO2 doubling

As global temperatures rise, vegetation types will change, particularly in the northern high latitudes. Under a warming scenario, shrub and grasslands over the Arctic are expected to shift to boreal forests. This study compares the impact of such a change in Arctic vegetation type with that of CO2 doubling on the seasonality of Arctic warming. Even though vegetation is changed throughout the year, the effect of the surface albedo change is maximum in boreal summer when the incoming solar radiation is largest. Evapotranspiration changes are also maximized in the summer, when the photosynthesis rate is highest. As a result, when Arctic vegetation change is considered in addition to doubled CO2, Arctic amplification is maximized earlier in the annual cycle.

• 出版日期2015-1-28
• 单位中国极地研究中心