کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4466262 1622188 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Moisture-advection feedback supports strong early-to-mid Holocene monsoon climate on the eastern Tibetan Plateau as inferred from a pollen-based reconstruction
ترجمه فارسی عنوان
بازخورد رطوبت پیشگیری از آب و هوای موزون هلوسن در اواسط و اوایل آب وهوا در شرق تبت است که از بازسازی بر روی گرده حاصل می شود
کلمات کلیدی
بازخورد رطوبت، موزون تبت پلاتو، هولوسن، آخرین گلادیاتور حداکثر، کالیبراسیون گرده و کالباس
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• Pollen record from a temperature- and precipitation-sensitive site
• Abrupt 3 °C temperature increase/decrease at 10.4/5.0 cal kyr
• Warm/wet early/mid Holocene related to moisture-advection feedback

(Paleo-)climatologists are challenged to identify mechanisms that cause the observed abrupt Holocene monsoon events despite the fact that monsoonal circulation is assumed to be driven by gradual insolation changes. Here we provide proxy and model evidence to show that moisture-advection feedback can lead to a non-linear relationship between sea-surface and continental temperatures and monsoonal precipitation. A pollen record from Lake Ximencuo (Nianbaoyeze Mountains) indicates that vegetation from the eastern margin of the Tibetan Plateau was characterized by alpine deserts and glacial flora after the Last Glacial Maximum (LGM) (21–15.5 cal kyr BP), by alpine meadows during the Late Glacial (15.5–10.4 cal kyr BP) and second half of the Holocene (5.0 cal kyr BP to present) and by mixed forests during the first half of the Holocene (10.4–5.0 cal kyr BP). The application of pollen-based transfer functions yields an abrupt temperature increase at 10.4 cal kyr BP and a decrease at 5.0 cal kyr BP of about 3 °C. By applying endmember modeling to grain-size data from the same sediment core we infer that frequent fluvial events (probably originating from high-magnitude precipitation events) were more common in the early and mid Holocene. We assign the inferred exceptional strong monsoonal circulation to the initiation of moisture-advection feedback, a result supported by a simple model that reproduces this feedback pattern over the same time period.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 402, 15 May 2014, Pages 44–54
نویسندگان
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