大高加索山南部大气降水氧同位素的气候意义

王涛; 李廷勇; 张键

doi:10.11932/karst20200309

大高加索山南部大气降水氧同位素的气候意义

doi: 10.11932/karst20200309

1.
西南大学地理科学学院岩溶环境重庆市重点实验室，重庆 400715/西南大学西南山地生态循环农业国家级培育基地，重庆 400715
2.
西南大学地理科学学院岩溶环境重庆市重点实验室，重庆 400715/西南大学西南山地生态循环农业国家级培育基地，重庆 400715/云南师范大学旅游与地理科学学院，昆明 650050

基金项目: 国家自然科学基金项目(41772170,42011530078)；西南大学西南山地生态循环农业国家级培育基地项目(5330200076)；中央高校基本科研业务费专项资金(XDJK2017A010)

计量
- 文章访问数: 1551
- HTML浏览量: 557
- PDF下载量: 375
- 被引次数: 0
出版历程
- 发布日期: 2020-06-25

Climatology interpretation of rainfall δ18Op across the southern Greater Caucasus region

1.
Chongqing Key Laboratory of Karst Environment,School of Geographical Sciences, Southwest University, Chongqing 400715,China/State Cultivation Base of Eco-agriculture for Southwest Mountainous Land，Southwest University,Chongqing 408435, China
2.
Chongqing Key Laboratory of Karst Environment,School of Geographical Sciences, Southwest University, Chongqing 400715,China/State Cultivation Base of Eco-agriculture for Southwest Mountainous Land，Southwest University,Chongqing 408435, China/College of Tourism and Geography, Yunnan Normal University, Kunming，Yunnan 650050, China

摘要

摘要: 大高加索山脉位于黑海和里海之间，是欧洲与亚洲的分界线，该区域气候受到北大西洋涛动 (North Atlantic Oscillation, NAO)的强烈影响。为了对该区域的大气降水δ18O (δ18OP) 与NAO的关系有更加深入的认识，本文利用大高加索山以南6个全球降水同位素监测网(Global Network of Isotope in Precipitation, GNIP)站点的δ18OP数据，分析该区域δ18OP 的季节变化规律，以及δ18OP与温度和降水量等气象要素及大气环流之间的关系。得到以下主要认识：① 在月时间尺度上，δ18OP与月平均温度之间有着显著的正相关关系(p<0.01)，表明该区域δ18OP主要受当地温度控制，表现出“温度效应”。② 北大西洋涛动通过改变西风的强度和位置从而影响δ18OP 的变化：当NAO呈现负相位时，此时西风输送较弱，使得来自地中海的富含18O的水汽能够达到大高加索山以南，该地区δ18OP偏正。而当NAO正相位时，西风急流输送较强，从北大西洋穿越黑海带来更多的δ18OP 偏轻的降水。因此，NAO所导致的水汽输送路径的变化可能是影响大高加索山以南地区δ18OP的重要因素，这一研究结果为利用该地区地质记录中的δ18O记录来重建过去的NAO变化提供了前提。
- δ18O /
- 北大西洋涛动 /
- 水汽源地 /
- 大高加索山南部地区
Abstract: Located between the Black sea and Caspian sea, the Great Caucasus are the boundary between Europe and Asia, where the climate is strongly influenced by the north Atlantic Oscillation (NAO). Based on data of six stations of the Global Network of Isotope in Precipitation (GNIP) in the south of the Great Caucasus, we analyzed seasonal variations of δ18Op as well as the relationship between δ18Op and local temperature, precipitation, and atmospheric circulation. Results show that， (1) On the monthly time scale, there is a significant positive correlation between the average monthly temperature and δ18Op (P < 0.01), which indicates that δ18Op in this region is mainly controlled by the local temperature, exhibiting a “temperature effect”. (2) The north Atlantic Oscillation (NAO) exerts influence on the variation of δ18Op by changing the intensity and position of the westerly wind. When the NAO is in a negative phase, the westerly wind transport is weaker, making δ18Op-rich from the Mediterranean able to arrive in the south of the Great Caucasus where the δ18Op value showing positive. While when NAO is in a positive phase, the westerly wind conveys strongly, bringing more precipitation with lighter δ18Op from the Black Sea. Therefore, the change of moisture transport path caused by NAO may be an important factor affecting the regional δ18Op in the south of the Great Caucasus, which should be taken into consideration when reconstructing the past NAO changes by using the geological δ18Op records in the region.
- atmospheric precipitation /
- δ18Op /
- north Atlantic Oscillation /
- water vapor source

HTML

参考文献(33)

[1]	Dansgaard W. Stable isotopes in precipitation［J］. Tellus, 1964，16(4): 436-468.
[2]	Rozanski K, Araguás-Araguás L, Gonfiantini R. Isotopic Patterns in Modern Global Precipitation［M］. Washington: American Geophysical Union， 1993：1-36.
[3]	Rozanski K, Araguás-Araguás L, Gonfiantini R. Relation between long-term trends of oxygen-18 isotope composition of precipitation and climate［J］.Science,1992，258(5084): 981-985.
[4]	Hoffmann G, Heimann M. Water isotope modeling in the Asian monsoon region［J］. J Quaternary International, 1997，37(2): 115-128.
[5]	Aragufis-Aragufis L, Froehlich K, Rozanski K. Stable isotope composition of precipitation over southeast Asia［J］. Journal of Geophysical Research Atmospheres, 1998，103(D22): 28721-28742.
[6]	Yamanaka T, Tsujimura M, Oyunbaatar D, et al. Isotopic variation of precipitation over eastern Mongolia and its implication for the atmospheric water cycle［J］. Journal of Hydrology, 2007，333(1): 21-34.
[7]	Tang Y, Pang H, Zhang W, et al. Effects of changes in moisture source and the upstream rainout on stable isotopes in summer precipitation-a case study in Nanjing, East China［J］. Hydrology and Earth System Sciences, 2015，12(4): 3919-3944.
[8]	Wang S, Zhang M, Crawford J, et al. The effect of moisture source and synoptic conditions on precipitation isotopes in arid central Asia［J］. Journal of Geophysical Research: Atmospheres, 2017，122(5): 2667-2682.
[9]	Krklec K, Domínguez-Villar D, Lojen S. The impact of moisture sources on the oxygen isotope composition of precipitation at a continental site in central Europe［J］. Journal of Hydrology, 2018，561: 810-821.
[10]	Cai Y, Chiang J C H, Breitenbach S F M, et al. Holocene moisture changes in western China, Central Asia, inferred from stalagmites［J］. Quaternary Science Reviews, 2017，158: 15-28.
[11]	Hurrell J W, Kushnir Y, Ottersen G, et al. An overview of the North Atlantic Oscillation［M］. Washington: American Geophysical Union, 2003.
[12]	Casado M, Ortega P, Masson-Delmotte V, et al. Impact of precipitation intermittency on NAO-temperature signals in proxy records［J］. Climate of the Past, 2013，9(2): 871-886.
[13]	Baldini L M, McDermott F, Foley A M, et al. Spatial variability in the European winter precipitation δ18O-NAO relationship: Implications for reconstructing NAO-mode climate variability in the Holocene［J］. Geophysical Research Letters, 2008， 35(4).
[14]	Field R D. Observed and modeled controls on precipitation δ18O over Europe: From local temperature to the Northern Annular Mode［J］. Journal of Geophysical Research, 2010， 115(D12）.
[15]	Sidorova O V, Siegwolf R T W, Saurer M, et al. Spatial patterns of climatic changes in the Eurasian north reflected in Siberian larch tree-ring parameters and stable isotopes［J］. Global Change Biology,2010， 16(3): 1003-1018.
[16]	Mischel S A, Scholz D, Sp?tl C. δ18O values of cave drip water: a promising proxy for the reconstruction of the North Atlantic Oscillation?［J］. Climate Dynamics, 2015，45(11-12): 3035-3050.
[17]	Wassenburg J A, Dietrich S, Fietzke J, et al. Reorganization of the North Atlantic Oscillation during early Holocene deglaciation［J］. Nature Geoscience, 2016， 9(8): 602-605.
[18]	Langebroek P M, Werner M, Lohmann G. Climate information imprinted in oxygen-isotopic composition of precipitation in Europe［J］. Earth and Planetary Science Letters, 2011， 311(1-2): 144-154.
[19]	Wu Z , Wang B , Li J , et al. An empirical seasonal prediction model of the east Asian summer monsoon using ENSO and NAO［J］. Journal of Geophysical Research Atmospheres, 2009, 114(D18).
[20]	Keggenhoff I, Elizbarashvili M, King L. Recent changes in Georgia?s temperature means and extremes: Annual and seasonal trends between 1961 and 2010［J］. Weather and Climate Extremes, 2015，8: 34-45.
[21]	Elizbarashvili M, Chartolani G, Khardziani T. Variations and trends of heating and cooling degree-days in Georgia for 1961—1990 year period［J］. Annals of Agrarian Science, 2018， 16(2): 152-159.
[22]	田立德，姚檀栋，White J W C，等. 喜马拉雅山中段高过量氘与西风带水汽输送有关［J］. 科学通报，2005，50(7): 669-672.
[23]	李佳芳，石培基，朱国锋，等．河西走廊中部大气降水δ18O变化特征及水汽输送［J］．环境科学学报，2015,35(4): 947-955.
[24]	Liu X, Rao Z, Zhang X, et al. Variations in the oxygen isotopic composition of precipitation in the Tianshan Mountains region and their significance for the Westerly circulation［J］. Journal of Geographical Sciences,2015， 25(7): 801-816.
[25]	Krklec K, Domínguez-Villar D., Quantification of the impact of moisture source regions on the oxygen isotope composition of precipitation over Eagle Cave, central Spain［J］. Geochimica Et Cosmochimica Acta,2014， 134(134): 39-54.
[26]	Brittingham A, Petrosyan Z, Hepburn J C, et al., Influence of the North Atlantic Oscillation on δD and δ18O in meteoric water in the Armenian Highland［J］. Journal of Hydrology,2019， 575: 513-522.
[27]	Craig H. Isotopic Variations in Meteoric Waters［J］. Science, 1961,， 133(3465): 1702-1703.
[28]	Stewart M K. Stable isotope fractionation due to evaporation and isotopic exchange of falling waterdrops: Applications to atmospheric processes and evaporation of lakes［J］. Journal of Geophysical Research, 1975， 80(9): 1133-1146.
[29]	Peng H, Mayer B, Norman A-L, et al. Modelling of hydrogen and oxygen isotope compositions for local precipitation［J］. Tellus B: Chemical and Physical Meteorology, 2005， 57(4): 273-282.
[30]	Pang Z, Kong Y, Froehlich K, et al. Processes affecting isotopes in precipitation of an arid region［J］. Tellus B: Chemical and Physical Meteorology, 2011， 63(3): 352-359.
[31]	Chen F, Zhang M, Wang S, et al. Relationship between sub-cloud secondary evaporation and stable isotopes in precipitation of Lanzhou and surrounding area［J］. Quaternary International, 2015， 380-381: 68-74.
[32]	Hurrell J W. Decadal trends in the north atlantic oscillation: regional temperatures and precipitation［J］. Science, 1995， 269(5224): 676-679.
[33]	Clarke M L, Rendell H M. Effects of storminess, sand supply and the North Atlantic Oscillation on sand invasion and coastal dune accretion in western Portugal［J］. The Holocene, 2006，16(3): 341-355.