caa a22 4500 605471649 CHVBK 20210128100334.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00382-014-2465-1 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2465-1 Asymmetric impact of the physiological effect of carbon dioxide on hydrological responses to instantaneous negative and positive CO2 forcing [Elektronische Daten] [Manabu Abe, Hideo Shiogama, Tokuta Yokohata, Seita Emori, Toru Nozawa] We conducted sensitivity experiments using a coupled atmosphere-ocean general circulation model to examine the asymmetry between the hydrological responses to instantaneous positive and negative CO2 forcing and the impact of the CO2 physiological effects (CDPEs) on these responses. This study focuses on the fast response occurring on time scales shorter than 1year after imposing CO2 forcing. Experiments investigating the CO2 physiological effect show that the fast response of precipitation to positive CO2 forcing is a decrease in the global and annual mean, whereas that of negative forcing is an increase the global and annual mean precipitation. The fast global precipitation response to negative forcing is stronger than the response to positive forcing. In contrast, the experiments without the CDPE reveal similar magnitudes of the fast global precipitation responses to negative and positive CO2 forcing. Significant differences in the magnitudes of the fast precipitation response due to the CDPE are found in tropical regions such as the Amazon Basin, the Maritime Continents, and tropical Africa, where C3-type plants are common. The stomatal conductance of plant leaves is decreased by both positive and negative CO2 forcing, which suppress the transpiration from the leaves. Consequently, the CDPE enhances the asymmetry of the fast precipitation responses to positive and negative CO2 forcing. The asymmetric impact of CDPE requires a careful evaluation of future hydrological changes which is constrained by paleoclimate evidence. Springer-Verlag Berlin Heidelberg, 2015 Carbon dioxide physiological effect nationallicence Hydrological response nationallicence Carbon dioxide forcing nationallicence Land surface model nationallicence General circulation model nationallicence Abe Manabu Department of Integrated Climate Change Prediction Research, Japan Agency for Marine-Earth Science and Technology, 236-0001, Yokohama, Japan aut Shiogama Hideo Center for Global Environmental Research, National Institute for Environmental Studies, 305-8506, Tsukuba, Japan aut Yokohata Tokuta Center for Global Environmental Research, National Institute for Environmental Studies, 305-8506, Tsukuba, Japan aut Emori Seita Center for Global Environmental Research, National Institute for Environmental Studies, 305-8506, Tsukuba, Japan aut Nozawa Toru Graduate School of Natural Science and Technology, Okayama University, 700-8530, Okayama, Japan aut Climate Dynamics Springer Berlin Heidelberg 45/7-8(2015-10-01), 2181-2192 0930-7575 45:7-8<2181 2015 45 382 https://doi.org/10.1007/s00382-014-2465-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2465-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Abe Manabu Department of Integrated Climate Change Prediction Research, Japan Agency for Marine-Earth Science and Technology, 236-0001, Yokohama, Japan aut NATIONALLICENCE 700 1- Shiogama Hideo Center for Global Environmental Research, National Institute for Environmental Studies, 305-8506, Tsukuba, Japan aut NATIONALLICENCE 700 1- Yokohata Tokuta Center for Global Environmental Research, National Institute for Environmental Studies, 305-8506, Tsukuba, Japan aut NATIONALLICENCE 700 1- Emori Seita Center for Global Environmental Research, National Institute for Environmental Studies, 305-8506, Tsukuba, Japan aut NATIONALLICENCE 700 1- Nozawa Toru Graduate School of Natural Science and Technology, Okayama University, 700-8530, Okayama, Japan aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/7-8(2015-10-01), 2181-2192 0930-7575 45:7-8<2181 2015 45 382