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Vegetation variations and associated environmental changes during marine isotope stage 3 in the western part of the Chinese Loess Plateau [An article from: ... Palaeoclimatology, Palaeoecology]
Book Details
PublisherElsevier
ISBN / ASINB000PDYKZS
ISBN-13978B000PDYKZ2
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This digital document is a journal article from Palaeogeography, Palaeoclimatology, Palaeoecology, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
This study further investigates the reported 'uniqueness' of MIS 3 climatic changes in northwestern China by focusing on the MIS 3 lacustrine-wetland sequences in the western part of the Chinese Loess Plateau. The lacustrine-wetland sequence at the Suancigou section documented four major environmental changes. Stratigraphic unit (i) was formed under lake-dominated environments (48,420-35,730 ^1^4C yr BP), unit (ii) under wetland-dominated environments (35,730-20,480 ^1^4C yr BP), and unit (iii) under eolian-dominated environments (20,480-13,090 ^1^4C yr BP). Unit (iv) is a fluvially-reworked eolian (loess) unit (13,090-11,450 ^1^4C yr BP). Pollen zone A (47,210-33,370 ^1^4C yr BP), representing a coniferous forest, corresponds to stratigraphic unit (i). Zone B (33,370-28,280 ^1^4C yr BP), representing a coniferous woodland landscape, and zone C (28,280-22,480 ^1^4C yr BP), representing a landscape in which coniferous woodlands alternated with steppes; correspond to unit (ii). Zone D (22,480-11,450 ^1^4C yr BP), representing a steppe landscape, corresponds to unit (iii) and unit (iv). We propose that the extremely wet MIS 3 was a combined result of mildly high summer insolation and constantly higher-than-normal winter insolation. That is, mildly high MIS 3 summer insolation was probably able to maintain the warmth of the ocean surface to the extent so that the Tibetan Plateau and northwestern China received an adequate supply of water-vapour. A constantly higher-than-normal MIS 3 winter insolation might have shortened the duration of the winter monsoon, so lengthening the rainy season. In addition, the soil-vegetation-air coupled feedback mechanisms under extensively well-vegetated wet conditions might have further enhanced the MIS 3 wet conditions.
Description:
This study further investigates the reported 'uniqueness' of MIS 3 climatic changes in northwestern China by focusing on the MIS 3 lacustrine-wetland sequences in the western part of the Chinese Loess Plateau. The lacustrine-wetland sequence at the Suancigou section documented four major environmental changes. Stratigraphic unit (i) was formed under lake-dominated environments (48,420-35,730 ^1^4C yr BP), unit (ii) under wetland-dominated environments (35,730-20,480 ^1^4C yr BP), and unit (iii) under eolian-dominated environments (20,480-13,090 ^1^4C yr BP). Unit (iv) is a fluvially-reworked eolian (loess) unit (13,090-11,450 ^1^4C yr BP). Pollen zone A (47,210-33,370 ^1^4C yr BP), representing a coniferous forest, corresponds to stratigraphic unit (i). Zone B (33,370-28,280 ^1^4C yr BP), representing a coniferous woodland landscape, and zone C (28,280-22,480 ^1^4C yr BP), representing a landscape in which coniferous woodlands alternated with steppes; correspond to unit (ii). Zone D (22,480-11,450 ^1^4C yr BP), representing a steppe landscape, corresponds to unit (iii) and unit (iv). We propose that the extremely wet MIS 3 was a combined result of mildly high summer insolation and constantly higher-than-normal winter insolation. That is, mildly high MIS 3 summer insolation was probably able to maintain the warmth of the ocean surface to the extent so that the Tibetan Plateau and northwestern China received an adequate supply of water-vapour. A constantly higher-than-normal MIS 3 winter insolation might have shortened the duration of the winter monsoon, so lengthening the rainy season. In addition, the soil-vegetation-air coupled feedback mechanisms under extensively well-vegetated wet conditions might have further enhanced the MIS 3 wet conditions.
