A quantitative description of the processes taking place among the atmosphere, vegetation and soil is needed for studying air-land interaction and interrelation between the geosphere and the biosphere. In this paper, ...A quantitative description of the processes taking place among the atmosphere, vegetation and soil is needed for studying air-land interaction and interrelation between the geosphere and the biosphere. In this paper, a simple land surface process model is proposed. Through transfers and exchanges of heat and water, the therrnal and moisture states of the atmosphere, vegetation and soil are linked in a coupled system, in which vegetation is considered as a horizontally uniform layer, soil is divided into three layers and the horizontal differences of variables in the system are neglected. The preliminary results of the experiment indicate that the model is capable of predicting the thermal and moisture conditions of the land surface and suitable to climate study.展开更多
In this paper, by using a simple climate model (SCM), a numerical simulationstudy has been conducted on the scientific and methodological aspects of Brazilian Proposal. Firstthe initial check of simple climate model h...In this paper, by using a simple climate model (SCM), a numerical simulationstudy has been conducted on the scientific and methodological aspects of Brazilian Proposal. Firstthe initial check of simple climate model has been done, then we do some sensitivity studies ontimeframes (attribution start and end dates, and evaluation date), and three attribution methods(marginal attribution method, proportional attribution method, and time-sliced attribution method),at last we get the main conclusions as follows: The simple climate model can represent the resultsof more complex climate model (e.g., HadCM3), and it is thus used to study the scientific andmethodological aspects of the Brazilian Proposal. Because of the limited knowledge of science anddata, although attributing a part of temperature increase to different GHG (greenhouse gas) emissionsource, there is considerable temperature increase unattributed to regional emissions. Therefore itis uncertain to make Brazilian Proposal as the method for the responsibility share of future GHGdecrease emission. The choices of different timeframes (attribution start and end dates, andevaluation date) and future emission SRES (Special Report on Emission Scenarios) make greatinfluence on the regional contributions to global climate changes, but different attribution methodshave only a little influence.展开更多
文摘A quantitative description of the processes taking place among the atmosphere, vegetation and soil is needed for studying air-land interaction and interrelation between the geosphere and the biosphere. In this paper, a simple land surface process model is proposed. Through transfers and exchanges of heat and water, the therrnal and moisture states of the atmosphere, vegetation and soil are linked in a coupled system, in which vegetation is considered as a horizontally uniform layer, soil is divided into three layers and the horizontal differences of variables in the system are neglected. The preliminary results of the experiment indicate that the model is capable of predicting the thermal and moisture conditions of the land surface and suitable to climate study.
基金The work is supported by Climate Change Special Funds of China Meteorological Administration (CCSF2005-2-QH11).
文摘In this paper, by using a simple climate model (SCM), a numerical simulationstudy has been conducted on the scientific and methodological aspects of Brazilian Proposal. Firstthe initial check of simple climate model has been done, then we do some sensitivity studies ontimeframes (attribution start and end dates, and evaluation date), and three attribution methods(marginal attribution method, proportional attribution method, and time-sliced attribution method),at last we get the main conclusions as follows: The simple climate model can represent the resultsof more complex climate model (e.g., HadCM3), and it is thus used to study the scientific andmethodological aspects of the Brazilian Proposal. Because of the limited knowledge of science anddata, although attributing a part of temperature increase to different GHG (greenhouse gas) emissionsource, there is considerable temperature increase unattributed to regional emissions. Therefore itis uncertain to make Brazilian Proposal as the method for the responsibility share of future GHGdecrease emission. The choices of different timeframes (attribution start and end dates, andevaluation date) and future emission SRES (Special Report on Emission Scenarios) make greatinfluence on the regional contributions to global climate changes, but different attribution methodshave only a little influence.
