Climatic classification over asia during the middle holocene climatic optimum based on PMIP models

Abstract

When considering potential global warming projections, it is useful to understand the impact of each climate condition at 6 kyr before present. Asian paleoclimate was simulated by performing an integration of the multi-model ensemble with the paleoclimate modeling intercomparison project (PMIP) models. The reconstructed winter (summer) surface air temperature at 6 kyr before present was 0.85 A(0)C (0.21 A(0)C) lower (higher) than the present day over Asia, 60A(0)E-150A(0)E, 10A(0)N-60A(0)N. The seasonal variation and heating differences of land and ocean in summer at 6 kyr before present might be much larger than present day. The winter and summer precipitation of 6 kyr before present were 0.067 and 0.017 mm center dot day(-1) larger than present day, respectively. The Group B climate, which means the dry climates based on Koppen climate classification, at 6 kyr before present decreased 17% compared to present day, but the Group D which means the continental and microthermal climates at 6 kyr before present increased over 7%. Comparison between the results from the model simulation and published paleo-proxy record agrees within the limited sparse paleo-proxy record data.