The Tianyang Maar Lake is situated in the southeastern Leizhou Peninsula

the transitional climate zone between tropical and subtropical region of China. In this paper

a study was carried out on the upper 40 meters of core TYC collected from the Tianyang Maar Lake. The results suggest that magnetic susceptibility (MS) correlates well with pollen records. Thus

variations of MS can be used as an indicator for climate and environmental changes in the Tianyang Maar Lake. Generally

a low MS indicates a warm and humid environmental condition

while a high MS suggests a cold or cool environment. Results of the MS analysis suggest that the environmental history of the Tianyang Maar lake area since the Middle Pleistocene can be divided into 9 stages: 346~301.4 ka BP

the climate was relatively warm and humid. 301.4~248.8 ka BP

the climate became relatively cool and dry. 248.8~188.8 ka BP

the climate was warm and humid. 188.8~125.2 ka BP

it was cold and dry. 125.2~69.3 ka BP

the climate was relatively warm and humid. 69.3~40.43 ka BP

the climate was cool. 40.43~25.5 ka BP

the climate was cool and the temperature was lower than the former stage

with a swamping transitional environment in Tianyang Maar Lake. 25.5 ~ 10.8 ka BP

the climate got even colder and drier

the water of Tianyang Maar Lake almost dried up. During the last 10.8 ka BP

the existence of human activities has probably resulted in high MS values.