Abstract:

During paleoclimate analysis using sediment chromaticity, some intermediate tools are always dependent and the results are usually indirect or general. Coupling relationship study of the modern sediment chromaticity and its corresponding climate parameters can find direct climate indication of the chromaticity parameters, which is helpful to promote the chromaticity application in paleoclimate research. In this paper, 210Pb dating is used for Xinfa Reservoir Inner Mongolia sediments. Combined with the local corresponding meteorological data, the sediment chromaticity and meteorological data are statistically analyzed. Four types of sediment chromaticity-climate parameter models were found in the northern section of the Greater Khingan Mountains between 1965 and 2022. Type Ⅰ, brightness negatively indicates the average annual precipitation, redness and yellowness positively indicate the average annual temperature, which corresponds to rainless cold and gentle breeze character. Type Ⅱ, brightness negatively indicates the average annual precipitation, and positively indicates the wind speed; The redness and yellowness are negatively indicating the average annual temperature, which corresponds to rainy chilly and gentler breeze. Type Ⅲ, the brightness and yellowness negatively indicate the average annual precipitation, and the redness is weak as climate indicator, which corresponds to a temperate rainy and moderate breeze climate. Type Ⅳ, brightness negatively indicates the average annual precipitation, redness and yellowness positively indicate the average annual wind speed, which corresponds to temperate rainy and more gentle and more light-gentle breeze. Among these models, brightness is mainly influenced by precipitation, redness is mainly influenced by evaporation, and yellowness is much complex.

Key words: modern sediments, paleoclimate, sediment chromaticity, meteorological data, chroma-climatic relation mode, climate indication, barrier lake