caa a22 4500 605472858 CHVBK 20210128100340.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00382-015-2515-3 doi (NATIONALLICENCE)springer-10.1007/s00382-015-2515-3 Improvement of rainfall simulation on the steep edge of the Tibetan Plateau by using a finite-difference transport scheme in CAM5 [Elektronische Daten] [Rucong Yu, Jian Li, Yi Zhang, Haoming Chen] Overestimation of precipitation over steep mountains has been a long-lasting bias in many climate models. After replacing the semi-Lagrangian method with a finite-difference approach for trace transport algorithm (the two-step shape preserving scheme, TSPAS), the modified NCAR CAM5 (M-CAM5) with high horizontal resolution results in a significant improvement of simulation in precipitation over the steep edge of the Tibetan Plateau. The M-CAM5 restrains the "overshoot” of water vapor to the high-altitude region of the windward slopes and significantly reduces the overestimation of precipitation in areas above 2000m along the southern edge of the Tibetan Plateau. More moisture are left in the low-altitude region on the slope where used to present dry biases in CAM5. The excessive (insufficient) amount of precipitation over the higher (lower) part of the steep slope is partially caused by the multi-grid water vapor transport in CAM5, which leads to spurious accumulation of water vapor at cold and high-altitude grids. Benefited from calculation of transport grid by grid in TSPAS and detailed description of steep mountains by the high-resolution model, M-CAM5 moves water vapor and precipitation downward over windward slopes and presents a more realistic simulation. Results in this study indicate that in addition to the development of physical parameterization schemes, the dynamical process should also be reconsidered in order to improve the climate simulation over steep mountains. Springer-Verlag Berlin Heidelberg, 2015 Climate model nationallicence Transport scheme nationallicence Precipitation nationallicence Tibetan Plateau nationallicence Yu Rucong LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China aut Li Jian LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China aut Zhang Yi LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China aut Chen Haoming LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China aut Climate Dynamics Springer Berlin Heidelberg 45/9-10(2015-11-01), 2937-2948 0930-7575 45:9-10<2937 2015 45 382 https://doi.org/10.1007/s00382-015-2515-3 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/s00382-015-2515-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yu Rucong LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China aut NATIONALLICENCE 700 1- Li Jian LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China aut NATIONALLICENCE 700 1- Zhang Yi LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China aut NATIONALLICENCE 700 1- Chen Haoming LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/9-10(2015-11-01), 2937-2948 0930-7575 45:9-10<2937 2015 45 382