Altitudinal effect of soil n-alkane δD values on the eastern Tibetan Plateau and their increasing isotopic fractionation with altitude
Tóm tắt
Stable isotope paleoaltimetry has provided unprecedented insights into the topographic histories of many of the world’s highest mountain ranges. However, on the Tibetan Plateau (TP), stable isotopes from paleosols generally yield much higher paleoaltitudes than those based on fossils. It is therefore essential when attempting to interpret accurately this region’s paleoaltitudes that the empirical calibrations of local stable isotopes and the relations between them are established. Additionally, it is vital that careful estimations be made when estimate how different isotopes sourced from different areas may have been influenced by different controls. We present here 29 hydrogen isotopic values for leaf wax-derived n-alkanes (i.e., δDwax values, and abundance-weighted average δD values of C29 and C31) in surface soils, as well as the δD values of soil water (δDsw) samples (totaling 22) from Mount Longmen (LM), on the eastern TP (altitude ~0.8–4.0 km above sea level (asl), a region climatically affected by the East Asian Monsoon (EAM). We compared our results with published data from Mount Gongga (GG). In addition, 47 river water samples, 55 spring water samples, and the daily and monthly summer precipitation records (from May to October, 2015) from two precipitation observation stations were collected along the GG transect for δD analysis. LM soil δDwax values showed regional differences and responded strongly to altitude, varying from‒160‰ to‒219‰, with an altitudinal lapse rate (ALR) of‒18‰ km‒1 (R
2=0.83; p<0.0001; n=29). These δDwax values appeared more enriched than those from the GG transect by ~40‰. We found that both the climate and moisture sources led to the differences observed in soil δDwax values between the LM and GG transects. We found that, as a general rule, ε
wax/rw, ε
wax/p and ε
wax/sw values (i.e., the isotopic fractionation of δDwax corresponding to δDrw, δDp and δDsw) increased with increasing altitude along both the LM and GG transects (up to 34‰and 50‰, respectively). Basing its research on a comparative study of δDwax, δDp, δDrw(δDspringw) and δDsw, this paper discusses the effects of moisture recycling, glacier-fed meltwater, relative humidity (RH), evapotranspiration (ET), vegetation cover, latitude, topography and/or other factors on ε
wax/p values. Clearly, if ε
wax-p values at higher altitudes are calculated using smaller ε
wax-p values from lower altitudes, the calculated paleowaterδDp values are going to be more depleted than the actual δD values, and any paleoaltitude would therefore be overestimated.
Tài liệu tham khảo
Bai Y, Fang X, Gleixner G, Mügler I. 2011. Effect of precipitation regime on δD values of soil n-alkanes from elevation gradients-implications for the study of paleo-elevation. Org Geochem, 42: 838–845
Bai Y, Fang X, Jia G, Sun J, Wen R, Ye Y. 2015. Different altitude effect of leaf wax n-alkane δD values in surface soils along two vapor transport pathways, southeastern Tibetan Plateau. Geochim Cosmochim Acta, 170: 94–107
Bai Y, Fang X, Tian Q. 2012. Spatial patterns of soil n-alkane δD values on the Tibetan Plateau: Implications for monsoon boundaries and paleoelevation reconstructions. J Geophys Res, 117: D20113
Bai Y, Tian Q, Fang X, Wu F. 2014. The “inverse altitude effect” of leaf waxderived n-alkane δD on the northeastern Tibetan Plateau. Org Geochem, 73: 90–100
Bershaw J, Penny S M, Garzione C N. 2012. Stable isotopes of modern water across the Himalaya and eastern Tibetan Plateau: Implications for estimates of paleoelevation and paleoclimate. J Geophys Res, 117: D02110
Craig H. 1961. Isotopic variations in meteoric waters. Science, 133: 1702–1703
Currie B S, Polissar P J, Rowley D B, Ingalls M, Li S, Olack G, Freeman K H. 2016. Multiproxy paleoaltimetry of the Late Oligocene-Pliocene Oiyug Basin, southern Tibet. Am J Sci, 316: 401–436
Ding L, Xu Q, Yue Y, Wang H, Cai F, Li S. 2014. The Andean-type Gangdese Mountains: Paleoelevation record from the Paleocene-Eocene Linzhou Basin. Earth Planet Sci Lett, 392: 250–264
Feakins S J, Bentley L P, Salinas N, Shenkin A, Blonder B, Goldsmith G R, Ponton C, Arvin L J, Wu M S, Peters T, West A J, Martin R E, Enquist B J, Asner G P, Malhi Y. 2016. Plant leaf wax biomarkers capture gradients in hydrogen isotopes of precipitation from the Andes and Amazon. Geochim Cosmochim Acta, 182: 155–172
Feakins S J, Sessions A L. 2010. Controls on the D/H ratios of plant leaf waxes in an arid ecosystem. Geochim Cosmochim Acta, 74: 2128–2141
Froehlich K, Kralik M, Papesch W, Rank D, Scheifinger H, Stichler W. 2008. Deuterium excess in precipitation of Alpine regions-moisture recycling. Isot Environ Health Stud, 44: 61–70
Garzione C N, Quade J, De Celles P G, English N B. 2000. Predicting paleoelevation of Tibet and the Himalaya from δ 18O vs. altitude gradients in meteoric water across the Nepal Himalaya. Earth Planet Sci Lett, 183: 215–229
Gébelin A, Mulch A, Teyssier C, Jessup M J, Law R D, Brunel M. 2013. The Miocene elevation of Mount Everest. Geology, 41: 799–802
Gonfiantini R. 1986. Environmental Isotopes in Lake Studies, Handbook of Environmental Isotope Geochemistry. Amsterdam: Elsevier Scientific Publishing Company. 113–167
Hoke G D, Jing L, Hren M T, Wissink G K, Garzione C N. 2014. Stable isotopes reveal high southeast Tibetan Plateau margin since the Paleogene. Earth Planet Sci Lett, 394: 270–278
Hren M T, Bookhagen B, Blisniuk P M, Booth A L, Chamberlain C P. 2009. δ 18O and δD of streamwaters across the Himalaya and Tibetan Plateau: Implications for moisture sources and paleoelevation reconstructions. Earth Planet Sci Lett, 288: 20–32
Insel N, Poulsen C J, Ehlers T A, Sturm C. 2012. Response of meteoric δ 18O to surface uplift—Implications for Cenozoic Andean Plateau growth. Earth Planet Sci Lett, 317-318: 262–272
Jia G, Bai Y, Ma Y, Sun J, Peng P. 2015. Paleoelevation of Tibetan Lunpola basin in the Oligocene-Miocene transition estimated from leaf wax lipid dual isotopes. Glob Planet Change, 126: 14–22
Jia G, Wei K, Chen F, Peng P. 2008. Soil n-alkane δD vs. altitude gradients along Mount Gongga, China. Geochim Cosmochim Acta, 72: 5165–5174
Johnson K R, Ingram B L. 2004. Spatial and temporal variability in the stable isotope systematics of modern precipitation in China: Implications for paleoclimate reconstructions. Earth Planet Sci Lett, 220: 365–377
Kahmen A, Hoffmann B, Schefuß E, Arndt S K, Cernusak L A, West J B, Sachse D. 2013. Leaf water deuterium enrichment shapes leaf wax n-alkane δD values of angiosperm plants II: Observational evidence and global implications. Geochim Cosmochim Acta, 111: 50–63
Lechler A R, Niemi N A. 2011. Controls on the spatial variability of modern meteoric δ18O: Empirical constraints from the Western U.S. and East Asia and implications for stable isotope studies. Am J Sci, 311: 664–700
Li Z, Feng Q, Liu W, Wang T, Guo X, Li Z, Gao Y, Pan Y, Guo R, Jia B, Song Y, Han C. 2015. The stable isotope evolution in Shiyi glacier system during the ablation period in the north of Tibetan Plateau, China. Quat Int, 380-381: 262–271
Li Z, Feng Q, Wang Q, Yong S, Cheng A, Li J. 2016. Contribution from frozen soil meltwater to runoff in an in-land river basin under water scarcity by isotopic tracing in northwestern China. Glob Planet Change, 136: 41–51
Liu J, Liu W, An Z, Yang H. 2016. Different hydrogen isotope fractionations during lipid formation in higher plants: Implications for paleohydrology reconstruction at a global scale. Sci Rep, 6: 19711
Liu Y, Liu F, Xu Z, Zhang J, Wang L, An S. 2015. Variations of soil water isotopes and effective contribution times of precipitation and throughfall to alpine soil water, in Wolong Nature Reserve, China. Catena, 126: 201–208
Liu Y, Xu Z, Duffy R, Chen W, An S, Liu S, Liu F. 2011. Analyzing relationships among water uptake patterns, rootlet biomass distribution and soil water content profile in a subalpine shrubland using water isotopes. Eur J Soil Biol, 47: 380–386
Luo J, Tang R, Sun S, Yang D, She J, Yang P. 2015. Lead distribution and possible sources along vertical zone spectrum of typical ecosystems in the Gongga Mountain, eastern Tibetan Plateau. Atmos Environ, 115: 132–140
Luo P, Peng P, Gleixner G, Zheng Z, Pang Z, Ding Z. 2011. Empirical relationship between leaf wax n-alkane δD and altitude in the Wuyi, Shennongjia and Tianshan Mountains, China: Implications for paleoaltimetry. Earth Planet Sci Lett, 301: 285–296
Pang Z, Kong Y, Froehlich K, Huang T, Yuan L, Li Z, Wang F. 2011. Processes affecting isotopes in precipitation of an arid region. Tellus B-Chem Phys Meteorol, 63: 352–359
Poage M A, Chamberlain C. 2001. Empirical relationships between elevation and the stable isotope composition of precipitation and surface waters: Considerations for studies of paleoelevation change. Am J Sci, 301: 1–15
Polissar P J, Freeman K H. 2010. Effects of aridity and vegetation on plant-wax δD in modern lake sediments. Geochim Cosmochim Acta, 74: 5785–5797
Polissar P J, Freeman K H, Rowley D B, Mc Inerney F A, Currie B S. 2009. Paleoaltimetry of the Tibetan Plateau from D/H ratios of lipid biomarkers. Earth Planet Sci Lett, 287: 64–76
Poulsen C J, Jeffery M L. 2011. Climate change imprinting on stable isotopic compositions of high-elevation meteoric water cloaks past surface elevations of major orogens. Geology, 39: 595–598
Quade J, Breecker D O, Daeron M, Eiler J. 2011. The paleoaltimetry of Tibet: An isotopic perspective. Am J Sci, 311: 77–115
Rowley D B, Currie B S. 2006. Palaeo-altimetry of the late Eocene to Miocene Lunpola basin, central Tibet. Nature, 439: 677–681
Rowley D B, Pierrehumbert R T, Currie B S. 2001. A new approach to stable isotope-based paleoaltimetry: Implications for paleoaltimetry and paleohypsometry of the High Himalaya since the Late Miocene. Earth Planet Sci Lett, 188: 253–268
Sachse D, Billault I, Bowen G J, Chikaraishi Y, Dawson T E, Feakins S J, Freeman K H, Magill C R, Mc Inerney F A, van der Meer M T J, Polissar P, Robins R J, Sachs J P, Schmidt H L, Sessions A L, White J W C, West J B, Kahmen A. 2012. Molecular paleohydrology: Interpreting the hydrogen- isotopic composition of lipid biomarkers from photosynthesizing organisms. Annu Rev Earth Planet Sci, 40: 221–249
Saylor J E, Quade J, Dettman D L, De Celles P G, Kapp P A, Ding L. 2009. The late Miocene through present paleoelevation history of southwestern Tibet. Am J Sci, 309: 1–42
Smith F A, Freeman K H. 2006. Influence of physiology and climate on δD of leaf wax n-alkanes from C3 and C4 grasses. Geochim Cosmochim Acta, 70: 1172–1187
Xu Q, Ding L, Zhang L, Cai F, Lai Q, Yang D, Liu-Zeng J. 2013. Paleogene high elevations in the Qiangtang Terrane, central Tibetan Plateau. Earth Planet Sci Lett, 362: 31–42
Xu Q, Hoke G D, Liu-Zeng J, Ding L, Wang W, Yang Y. 2014. Stable isotopes of surface water across the Longmenshan margin of the eastern Tibetan Plateau. Geochem Geophys Geosyst, 15: 3416–3429
Yao T, Masson-Delmotte V, Gao J, Yu W, Yang X, Risi C, Sturm C, Werner M, Zhao H, He Y, Ren W, Tian L, Shi C, Hou S. 2013. A review of climatic controls on δ 18O in precipitation over the Tibetan Plateau: Observations and simulations. Rev Geophys, 51: 525–548
Yu W, Xu B, Lai C T, Ma Y, Tian L, Qu D, Zhu Z. 2014. Influences of relative humidity and Indian monsoon precipitation on leaf water stable isotopes from the southeastern Tibetan Plateau. Geophys Res Lett, 41: 7746–7753
Zhang G, Pan B, Cao B, Wang J, Cui H, Cao X. 2015. Elevation changes measured during 1966–2010 on the monsoonal temperate glaciers’ ablation region, Gongga Mountains, China. Quat Int, 371: 49–57
Zhuang G, Brandon M T, Pagani M, Krishnan S. 2014. Leaf wax stable isotopes from Northern Tibetan Plateau: Implications for uplift and climate since 15 Ma. Earth Planet Sci Lett, 390: 186–198