There exist varieties of feedback mechanisms in climate system, and the different description of these climate feedback mechanisms within climate models is one of the major causes for the different responses of these models to the same direct radiative forcing (e.g., doubling CO2).
The normalized shortwave radiative forcing is 0.006 W·m~-2 ·DU~-1 and the net radiative forcing is 0.021 W·m~-2·DU~-1 . The ozone increments caused by climate response are between -0.470 DU and 0.725 DU , and the average value is 30.924 DU in the area.
Then the role of feedback in regional climate changes and persistence is studied theoretically. Finally, the feedback relationships between soil moisture and air tern perature in land is also investigated by utilizing this model. The results obtained are important to deeply understand the cause of regional climate changes and the feedback processes between regional climate variables.
Furthermore, some climate feedbacks existing in interior of the climate system and involving the planet's biology and chemistry have also been discussed.
However,RCMs still face many challenging issues due to the complicated scale interaction over a large-range temporal and spatial scales(e.g.,from mesoscale to synoptic and planetary scale disturbances),the interaction of individual climate sub-systems(e.g.,atmosphere,biosphere,water,ice-snow,land-surface),and the lack of understanding of some complex physical processes,especially clouds and soil moisture.
The effective climate feedback/sensitivity, including its components, is a robust first order feature of the Canadian Centre for Climate Modelling and Analysis (CCCma) coupled global climate model (GCM) and presumably of the climate system.
The importance of processes which determine cloud properties and distribution is again manifest both in determining first order climate feedback/sensitivity and also in determining its second order variation with climate state.
Positive values of dγ/dTs characterize a positive climatic feedback through the lapse rate and indicate a general decrease in the static stability of the troposphere during global warming.
Furthermore, Asian dust may be involved in climatic feedback mechanisms via a variety of physical-biogeochemical processes.
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Variations of the global mean and zonal mean net radiation in various surface conditions are analysed quantitatively with a changing cloud cover. The sensitivity of net radiation to the cloud cover and the variation of this sensitivity with the changes of other climatic variables are discussed. In addition, the feed-back of cloud cover in global climate system and its variation with other climatic variables are also dealt with qualitatively. It is found that net radiation is sensitive to cloud cover and onl...
Ozone is one of the most important trace gases in the atmosphere. The greenhouse effect of the stratospheric ozone on the lower atmosphere and the'ground surface, and its feedback effect on the global climate are analysed in this paper. The cloud radiative forcing and its importance for the greenhouse effect are pointed out. The remarkable phenomenon of the Antarctic Ozone Hole is further discussed.
Synthesizing the available data at home and abroad, the authors concluded that the global climate change controlls the desertification and de-desertification by its effect on the variation in dry-wet climate over sand area; on the other hand, the desertification and de-desertification have a feedback effect on global climate change in the way of its impact on the radiation equilibrium, condensation nucleus, moisture and convection. If the global climate became warming due to the man-made CO_2 and other gree...
气候反馈
climate feedback
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