Affiliation of Author(s):民航学院
Journal:THEORETICAL AND APPLIED CLIMATOLOGY
Key Words:MCGILL PALEOCLIMATE MODEL COVER CHANGE SEA-ICE SYSTEM MODEL INTERMEDIATE COMPLEXITY VEGETATION DYNAMICS UNITED-STATES CARBON-CYCLE PART II IMPACTS
Abstract:Deforestation is expanding and accelerating into the remaining areas of undisturbed forest, and the quality of the remaining forests is declining today. Assessing the climatic impacts of deforestation can help to rectify this alarming situation. In this paper, how historical deforestation may affect global climate through interactive ocean and surface albedo is examined using an Earth system model of intermediate complexity (EMIC). Control and anomaly integrations are performed for 1000 years. In the anomaly case, cropland is significantly expanded since AD 1700. The response of climate in deforested areas is not uniform between the regions. In the background of a global cooling of 0.08 A degrees C occurring with cooler surface air above 0.4 A degrees C across 30A degrees N to 75A degrees N from March to September, the surface albedo increase has a global cooling effect in response to global-scale replacement of forests by cropland, especially over northern mid-high latitudes. The northern mid-latitude (30A degrees N-60A degrees N) suffers a prominent cooling in June, suggesting that this area is most sensitive to cropland expansion through surface albedo. Most regions show a consistent trend between the overall cooling in response to historical deforestation and its resulting cooling due to surface albedo anomaly. Furthermore, the effect of the interactive ocean on shaping the climate response to deforestation is greater than that of prescribed SSTs in most years with a maximum spread of 0.05 A degrees C. This difference is more prominent after year 1800 than that before due to the more marked deforestation. These findings show the importance of the land cover change and the land surface albedo, stressing the necessity to analyze other biogeophysical processes of deforestation using interactive ocean.
ISSN No.:0177-798X
Translation or Not:no
Date of Publication:2017-02-01
Correspondence Author:wy