Transformation of ENSO‐related rainwater to dripwater <i>δ</i><sup>18</sup>O variability by vadose water mixing

Moerman, J. W.; Cobb, Kim M.; Partin, J. W.; Meckler, Anna Nele; Carolin, Stacy; Adkins, Jess F.; Lejau, Syria; Malang, Jenny; Clark, Brian R.; Tuen, Andrew Alek

doi:10.1002/2014gl061696

Cited by 66 publications

(70 citation statements)

References 57 publications

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“…Fuller et al, 2008;Moerman et al, 2014;Riechelmann et al, 2011;Treble et al, 2013;Duan et al, 2016), although the complexity of the response of the speleothem δ 18 O signal to climate is also recognised owing to karst hydrological pathways (Baker and Brunsdon, 2003;, recharge thresholds (Pape et al, 2010;Markowska et al, 2015), and in-cave effects, including disequilibrium during degassing (due to evaporation) and ventilation effects (e.g. Pape et al, 2010;Feng et al, 2012;Deininger et al, 2012;Cuthbert et al, 2014a, b;Riechelmann et al, 2013;Dreybrodt and Deininger, 2014;Rau et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Hydroclimate of the Last Glacial Maximum and deglaciation in southern Australia's arid margin interpreted from speleothem records (23–15 ka)

et al. 2017

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Abstract. Terrestrial data spanning the Last Glacial Maximum (LGM) and deglaciation from the southern Australian region are sparse and limited to discontinuous sedimentological and geomorphological records with relatively large chronological uncertainties. This dearth of records has hindered a critical assessment of the role of the Southern Hemisphere mid-latitude westerly winds on the region's climate during this time period. In this study, two precisely dated speleothem records for Mairs Cave, Flinders Ranges, are presented, providing for the first time a detailed terrestrial hydroclimatic record for the southern Australian drylands during 23-15 ka. Recharge to Mairs Cave is interpreted from the speleothem record by the activation of growth, physical flood layering, and δ 18 O and δ 13 C minima. Periods of lowered recharge are indicated by 18 O and 13 C enrichment, primarily affecting δ 18 O, argued to be driven by evaporation of shallow soil/epikarst water in this water-limited environment. A hydrological driver is supported by calcite fabric changes. These include the presence of laminae, visible organic colloids, and occasional dissolution features, related to recharge, as well as the presence of sediment bands representing cave floor flooding. A shift to slower-growing, more compact calcite and an absence of lamination is interpreted to represent reduced recharge.

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Section: Introductionmentioning

confidence: 99%

Hydroclimate of the Last Glacial Maximum and deglaciation in southern Australia's arid margin interpreted from speleothem records (23–15 ka)

et al. 2017

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“…Over the CE, air temperature in a given cave likely changed very little (< 1 • C or ∼ 0.2 ‰ in stalagmite δ 18 O units) (Moerman et al, 2014), while it may reflect years in semiarid and arid environments (Ayalon et al, 1998). Some studies also show that recharge of the aquifer occurs only during months when rainfall passes a given threshold, typically during the wet season in the tropics (e.g., Jones and Banner, 2003;Partin et al, 2012), but possibly associated with the winter storm season in the extratropics.…”

Section: Speleothemsmentioning

confidence: 99%

“…As such, many calibration efforts demonstrate that speleothem δ 18 O is inversely correlated with the instrumental rainfall at the site on annual to decadal timescales (e.g., Partin et al, 2013). In other locations, rainfall δ 18 O and cave dripwater δ 18 O correlate better with indices of large-scale circulation patterns (e.g., ENSO indices) than with local rainfall amount (Moerman et al, 2013(Moerman et al, , 2014. Lastly, some studies show that speleothem δ 18 O can reflect changes in the source of precipitation, which alters the δ 18 O of rainfall (Aggarwal et al, 2004;Breitenbach et al, 2010).…”

Section: Speleothemsmentioning

confidence: 99%

“…Water isotopes are measured in every major paleoclimatic archive (trees, speleothems, corals, sediments, ice cores) and are complex but powerful indicators of the hydrological cycle. Isotopic records reflect large-scale atmospheric processes, such as changes in precipitation source region, vapor transport, local amount effects, and the seasonality of precipitation, and often capture large-scale climate modes, such as ENSO, the Indian Ocean Dipole, and monsoon characteristics, more strongly than precipitation amount at a given location (Vuille et al, 2005a, b;Vuille and Werner, 2005;Konecky et al, 2014;Moerman et al, 2013Moerman et al, , 2014. Water isotopes are therefore in many ways ideal indicators for comparison with coarse-resolution model output (Jouzel et al, 1994;Hoffmann et al, 1998;Schmidt et al, 2007;Risi et al, 2010;Pausata et al, 2011;Dee et al, 2015).…”

Section: Expectations Of Temporal or Spatial Consistency Betweenmentioning

confidence: 99%

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Comparing proxy and model estimates of hydroclimate variability and change over the Common Era

Smerdon¹,

Luterbacher²,

Phipps³

et al. 2017

Clim. Past

101

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Abstract. Water availability is fundamental to societies and ecosystems, but our understanding of variations in hydroclimate (including extreme events, flooding, and decadal periods of drought) is limited because of a paucity of modern instrumental observations that are distributed unevenly across the globe and only span parts of the 20th and 21st centuries. Such data coverage is insufficient for characterizing hydroclimate and its associated dynamics because of its multidecadal to centennial variability and highly regionalized spatial signature. High-resolution (seasonal to decadal) hydroclimatic proxies that span all or parts of the Common Era (CE) and paleoclimate simulations from climate models are therefore important tools for augmenting our understanding of hydroclimate variability. In particular, the comparison of the two sources of information is critical for addressing the uncertainties and limitations of both while enriching each of their interpretations. We review the principal proxy data available for hydroclimatic reconstructions over the CE and highlight the contemporary understanding of how these proxies are interpreted as hydroclimate indicators. We also review the available last-millennium simulations from fully coupled climate models and discuss several outstanding challenges associated with simulating hydroclimate variability and change over the CE. A specific review of simulated hydroclimatic changes forced by volcanic events is provided, as is a discussion of expected improvements in estimated radiative forcings, models, and their implementation in the future. Our review of hydroclimatic proxies and last-millennium model simulations is used as the basis for articulating a variety of considerations and best practices for how to perform proxy-model comparisons of CE hydroclimate. This discussion provides a framework for how best to evaluate hydroclimate variability and its associated dynamics using these comparisons and how they can better inform interpretations of both proxy data and model simulations. We subsequently explore means of using proxy-model comparisons to better constrain and characterize future hydroclimate risks. This is explored specifically in the context of several examples that demonstrate how proxy-model comparisons can be used to quantitatively constrain future hydroclimatic risks as estimated from climate model projections.

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“…However, correct attribution of δ 18 O variations to specific climate variables requires a detailed proxy-and site-specific understanding, because multiple factors influence the δ 18 O p signal and how it is ultimately recorded. In the case of speleothems, this requires, inter-alia, a good understanding of the dynamic and potentially complex mixing behaviour of infiltrating meteoric water in soils and the unsaturated zone of karst systems (Williams, 2008;Baker and Bradley, 2010;Bradley et al, 2010;Baker et al, 2012;Jex et al, 2013;Moerman et al, 2014;Genty et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Data-model comparison of soil–water δ 18 O at a temperate site in N. Spain with implications for interpreting speleothem δ 18 O

Comas-Bru

McDermott

2015

Journal of Hydrology

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Publication informationJournal of Hydrology, Publisher Elsevier Item record/more information http://hdl.handle.net/10197/7200 Publisher's statementThis is the author's version of a work that was accepted for publication in Journal of Hydrology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Hydrology (VOL 530, ISSUE 2015, (2015

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Transformation of ENSO‐related rainwater to dripwater δ¹⁸O variability by vadose water mixing

Cited by 66 publications

References 57 publications

Hydroclimate of the Last Glacial Maximum and deglaciation in southern Australia's arid margin interpreted from speleothem records (23–15 ka)

Hydroclimate of the Last Glacial Maximum and deglaciation in southern Australia's arid margin interpreted from speleothem records (23–15 ka)

Comparing proxy and model estimates of hydroclimate variability and change over the Common Era

Data-model comparison of soil–water δ 18 O at a temperate site in N. Spain with implications for interpreting speleothem δ 18 O

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Transformation of ENSO‐related rainwater to dripwater δ18O variability by vadose water mixing

Cited by 66 publications

References 57 publications

Hydroclimate of the Last Glacial Maximum and deglaciation in southern Australia's arid margin interpreted from speleothem records (23–15 ka)

Hydroclimate of the Last Glacial Maximum and deglaciation in southern Australia's arid margin interpreted from speleothem records (23–15 ka)

Comparing proxy and model estimates of hydroclimate variability and change over the Common Era

Data-model comparison of soil–water δ 18 O at a temperate site in N. Spain with implications for interpreting speleothem δ 18 O

Contact Info

Product

Resources

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Transformation of ENSO‐related rainwater to dripwater δ¹⁸O variability by vadose water mixing

Hydroclimate of the Last Glacial Maximum and deglaciation in southern Australia's arid margin interpreted from speleothem records (23–15 ka)

Hydroclimate of the Last Glacial Maximum and deglaciation in southern Australia's arid margin interpreted from speleothem records (23–15 ka)