中晚全新世毛烏素沙地東南部氣候變化過程
發(fā)布時間:2019-02-15 10:15
【摘要】:位于中國北方半干旱區(qū)的毛烏素沙地對氣候變化響應(yīng)敏感,是研究氣候變化的理想?yún)^(qū)域。通過對毛烏素沙地東南部錦界剖面磁化率、有機質(zhì)含量、Ca CO3含量的分析,重建了7.5 ka BP以來的氣候變化過程。結(jié)果顯示:中晚全新世毛烏素沙地東南部環(huán)境與氣候變化可分為3個階段:7.5~4.6 ka BP,夏季風(fēng)占主導(dǎo),氣候暖濕,與全新世大暖期對應(yīng);4.6~3.3 ka BP,氣候突變?yōu)楦衫洳⒉▌宇l繁;3.3~2.5 ka BP氣候以干冷為主。另外,存在5次千年尺度的干旱事件:7.0~6.8 ka BP、6.6~5.7 ka BP、4.6~4.1 ka BP、3.7~3.5 ka BP、3.3~2.5 ka BP。研究區(qū)氣候變化與全球具有較好的一致性。
[Abstract]:Maowusu sandy land located in the semiarid region of northern China is sensitive to climate change and is an ideal region to study climate change. Based on the analysis of magnetic susceptibility, organic matter content and Ca CO3 content in the Jinjie section of southeastern Maowusu Sandy Land, the climatic change process since 7.5 ka BP was reconstructed. The results show that the environment and climate change of southeastern Maowusu sandy land in the Middle-Late Holocene can be divided into three stages: 7.54.6 ka BP, summer monsoon dominates, and the climate is warm and wet, corresponding to the Holocene warm period; The climate of 4. 6C 3. 3 ka BP, changed to dry cold and fluctuated frequently, and 3. 3% 2. 5 ka BP climate was mainly dry and cold. In addition, there were 5 millennial drought events: 7.0 / 6.8 ka BP,6.6~5.7 ka BP,4.6~4.1 ka BP,3.7~3.5 ka BP,3.3~2.5 ka BP. Climate change in the study area is in good agreement with the global climate change.
【作者單位】: 中國科學(xué)院西北生態(tài)環(huán)境資源研究院中國科學(xué)院沙漠與沙漠化重點實驗室;中國科學(xué)院大學(xué);新疆農(nóng)墾科學(xué)院林園研究所;
【基金】:國家自然科學(xué)基金項目(41272191,41501220,41671204)
【分類號】:P532
[Abstract]:Maowusu sandy land located in the semiarid region of northern China is sensitive to climate change and is an ideal region to study climate change. Based on the analysis of magnetic susceptibility, organic matter content and Ca CO3 content in the Jinjie section of southeastern Maowusu Sandy Land, the climatic change process since 7.5 ka BP was reconstructed. The results show that the environment and climate change of southeastern Maowusu sandy land in the Middle-Late Holocene can be divided into three stages: 7.54.6 ka BP, summer monsoon dominates, and the climate is warm and wet, corresponding to the Holocene warm period; The climate of 4. 6C 3. 3 ka BP, changed to dry cold and fluctuated frequently, and 3. 3% 2. 5 ka BP climate was mainly dry and cold. In addition, there were 5 millennial drought events: 7.0 / 6.8 ka BP,6.6~5.7 ka BP,4.6~4.1 ka BP,3.7~3.5 ka BP,3.3~2.5 ka BP. Climate change in the study area is in good agreement with the global climate change.
【作者單位】: 中國科學(xué)院西北生態(tài)環(huán)境資源研究院中國科學(xué)院沙漠與沙漠化重點實驗室;中國科學(xué)院大學(xué);新疆農(nóng)墾科學(xué)院林園研究所;
【基金】:國家自然科學(xué)基金項目(41272191,41501220,41671204)
【分類號】:P532
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