過去2000年氣候環(huán)境變化是目前全球變化研究的重點(diǎn)內(nèi)容之一,，其主要原因?yàn)樵摃r(shí)段是過去長尺度全球變化與現(xiàn)代器測時(shí)期氣候環(huán)境研究的接軌點(diǎn),，也是人類對自然影響最深刻的時(shí)段。過去2000年存在中世紀(jì)暖期（MWP）,、小冰期（LIA）以及20世紀(jì)以來的全球變暖三個(gè)明顯的時(shí)段,。研究中世紀(jì)暖期（MWP）與小冰期（LIA）兩段時(shí)期的氣候環(huán)境特征及形成原因，有助于識(shí)別人類活動(dòng)對氣候環(huán)境的影響及預(yù)估未來氣候變化,。
位于新疆的封閉淺水湖——艾比湖對氣候變化具有敏感響應(yīng),。中國科學(xué)院新疆生態(tài)與地理研究所馬龍博士通過對時(shí)間跨度為1500年的湖泊沉積物中碳酸鹽碳（δ13Ccarb）、氧同位素（δ18Ocarb）以及有機(jī)質(zhì)碳同位素（δ13Corg）等環(huán)境代用指標(biāo)的分析,，對中世紀(jì)暖期（MWP）與小冰期（LIA）的區(qū)域環(huán)境變化特征及其機(jī)理進(jìn)行了研究,。結(jié)果表明：碳酸鹽氧同位素（δ18Ocarb）反映了流域降水/蒸發(fā)比值以及湖泊水位的波動(dòng)，碳同位素（δ13Ccarb）的變化與湖泊水體pH值有關(guān),；而有機(jī)質(zhì)碳同位素（δ13Corg）主要反映了流域降水量的變化,。整體上來看，艾比湖地區(qū)具有中世紀(jì)暖期干燥,，小冰期濕潤的氣候變化特征,。最后，馬龍博士通過艾比湖湖泊沉積物環(huán)境代用指標(biāo)與西伯利亞高壓指數(shù)等數(shù)據(jù)的綜合對比,，認(rèn)為艾比湖地區(qū)小冰期（~ AD 1400-1750）濕潤的氣候特征,，某種程度上與該時(shí)期內(nèi)西伯利亞高壓的增強(qiáng)有關(guān)。
研究論文以“The Medieval Warm Period and the Little Ice Age from a sediment record of Lake Ebinur, northwest China”為題發(fā)表在《北風(fēng)》（Boreas）雜志上。（生物谷Bioon.com）
DOI:10.1111/j.1502-3885.2010.00200.x
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PMID:
The Medieval Warm Period and the Little Ice Age from a sediment record of Lake Ebinur, northwest China
LONG, MA; JINGLU, WU; HONG, YU; HAIAO, ZENG; ABUDUWAILI, JILILI
Lake Ebinur, Xinjiang, northwest China, is a closed‐asin, shallow lake that responds rapidly to changes in the ratio of precipitation to evaporation (P/E). A sediment record spanning the last 1500 years was obtained from the lake. We used δ18O and δ13C in bulk carbonate, and δ13C of organic matter in the lake sediments to infer environmental changes in the Ebinur region during the Medieval Warm Period (MWP) and the Little Ice Age (LIA). Decreased δ18O values of carbonate largely reflect an enhanced P/E ratio within the basin and a higher lake level. Bulk carbonates with higher δ13C values are deposited during periods when lake‐water pH is high, while lower δ13C values reflect a lower pH in the water column. δ13C in organic matter is associated with the amount of precipitation. The results indicate that the Ebinur region experienced a dry MWP and a wet LIA, although the MWP and LIA were warm and cold periods, respectively, as expected. Furthermore, the MWP and LIA were hydrologically complex and cannot be characterized as uniformly wet or dry. Peak wet periods are recorded in the sediment core around AD 1000, 1400 and 1700, and a dry event also occurred in the period of temperature change within the LIA (cold to warm around AD 1500). A comparison of the Lake Ebinur data with proxy records for the strength of the Siberian High and climate proxy indicators suggests that precipitation in the Ebinur region was a consequence, in part, of an enhanced Siberian High during the LIA.
