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Modeling the middle Pliocene climate with a global atmospheric general circulation model

Bergen Open Research Archive

Show simple item record Jiang, Dabang Wang, Huijun Ding, Zhongli Lang, Xianmei Drange, Helge 2005-09-22T08:25:17Z 2005-09-22T08:25:17Z 2005-07-27
dc.identifier.citation Journal of Geophysical Research Atmospheres 2005 110(D14107) en
dc.identifier.issn 0148-0227
dc.description.abstract A new climate simulation for the middle Pliocene (ca. 3 Ma BP) is performed by a global grid-point atmospheric general circulation model developed at the Institute of Atmospheric Physics (IAP AGCM) with boundary conditions provided by the U. S. Geological Survey's Pliocene Research, Interpretations, and Synoptic Mapping (PRISM) group. It follows that warmer and slightly wetter conditions dominated at the middle Pliocene with a globally annual mean surface temperature increase of 2.60°C, and an increase in precipitation of 4.0% relative to today. At the middle Pliocene, globally annual terrestrial warming was 1.86°C, with stronger warming toward high latitudes. Annual precipitation enhanced notably at high latitudes, with the augment reaching 33.5% (32.5%) of the present value at 60–90°N (60–90°S). On the contrary, drier conditions were registered over most parts at 0–30°N, especially in much of East Asia and the northern tropical Pacific. In addition, both boreal summer and winter monsoon significantly decreased in East Asia at the middle Pliocene. It is indicated that the IAP AGCM simulation is generally consistent with the results from other atmospheric models and agrees well with available paleoclimatic reconstructions in East Asia. Additionally, it is further revealed that the PRISM warmer sea surface temperature and reduced sea ice extent are main factors determining the middle Pliocene climate. The simulated climatic responses arising from the PRISM reconstructed vegetation and continental ice sheet cannot be neglected on a regional scale at mid to high latitudes (like over Greenland and the Qinghai-Tibetan Plateau, and around the circum-Antarctic) but have little influence on global climate. en
dc.format.extent 1140384 bytes
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher American Geophysical Union en
dc.subject Atmospheric processes en
dc.subject Paleoclimatology en
dc.title Modeling the middle Pliocene climate with a global atmospheric general circulation model en
dc.type Journal article en
dc.type Peer reviewed en

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