{"id":193,"date":"2017-03-16T23:25:41","date_gmt":"2017-03-16T22:25:41","guid":{"rendered":"http:\/\/tocsy.pik-potsdam.de\/quest\/?page_id=193"},"modified":"2017-05-03T19:55:42","modified_gmt":"2017-05-03T17:55:42","slug":"publications","status":"publish","type":"page","link":"https:\/\/quest.pik-potsdam.de\/?page_id=193","title":{"rendered":"Publications"},"content":{"rendered":"
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2020<\/h3>

Nava-Fernandez, C.; Hartland, A.; G\u00e1zquez, F.; Kwiecien, O.; Marwan, N.; Fox, B.; Hellstrom, J.; Pearson, A.; Ward, B.; French, A.; Hodell, D. A.; Immenhauser, A.; Breitenbach, S. F. M.<\/p>

Pacific climate reflected in Waipuna Cave drip water hydrochemistry<\/a> Journal Article<\/span> <\/p>

In: <\/span>Hydrology and Earth System Sciences, <\/span>vol. 24, <\/span>pp. 3361\u20133380, <\/span>2020<\/span>.<\/p>

Abstract<\/a><\/span> | Links<\/a><\/span> | BibTeX<\/a><\/span><\/p>

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@article{navafernandez2020,
\r\ntitle = {Pacific climate reflected in Waipuna Cave drip water hydrochemistry},
\r\nauthor = {C. Nava-Fernandez and A. Hartland and F. G\u00e1zquez and O. Kwiecien and N. Marwan and B. Fox and J. Hellstrom and A. Pearson and B. Ward and A. French and D. A. Hodell and A. Immenhauser and S. F. M. Breitenbach},
\r\nurl = {https:\/\/www.hydrol-earth-syst-sci.net\/24\/3361\/2020\/},
\r\ndoi = {10.5194\/hess-24-3361-2020},
\r\nyear  = {2020},
\r\ndate = {2020-07-01},
\r\njournal = {Hydrology and Earth System Sciences},
\r\nvolume = {24},
\r\npages = {3361\u20133380},
\r\nabstract = {
\r\n
\r\nCave microclimate and geochemical monitoring is vitally important for correct interpretations of proxy time series from speleothems with regard to past climatic and environmental dynamics. We present results of a comprehensive cave-monitoring programme in Waipuna Cave in the North Island of New Zealand, a region that is strongly influenced by the Southern Westerlies and the El Ni\u00f1o\u2013Southern Oscillation (ENSO). This study aims to characterise the response of the Waipuna Cave hydrological system to atmospheric circulation dynamics in the southwestern Pacific region in order to assure the quality of ongoing palaeo-environmental reconstructions from this cave.
\r\n
\r\nDrip water from 10 drip sites was collected at roughly monthly intervals for a period of ca. 3 years for isotopic (\u03b418O, \u03b4D, d-excess parameter, \u03b417O, and 17Oexcess) and elemental (Mg\u2215Ca and Sr\u2215Ca) analysis. The monitoring included spot measurements of drip rates and cave air CO2 concentration. Cave air temperature and drip rates were also continuously recorded by automatic loggers. These datasets were compared to surface air temperature, rainfall, and potential evaporation from nearby meteorological stations to test the degree of signal transfer and expression of surface environmental conditions in Waipuna Cave hydrochemistry.
\r\n
\r\nBased on the drip response dynamics to rainfall and other characteristics, we identified three types of discharge associated with hydrological routing in Waipuna Cave: (i) type 1 \u2013 diffuse flow, (ii) type 2 \u2013 fracture flow, and (iii) type 3 \u2013 combined flow. Drip water isotopes do not reflect seasonal variability but show higher values during severe drought. Drip water \u03b418O values are characterised by small variability and reflect the mean isotopic signature of precipitation, testifying to rapid and thorough homogenisation in the epikarst. Mg\u2215Ca and Sr\u2215Ca ratios in drip waters are predominantly controlled by prior calcite precipitation (PCP). Prior calcite precipitation is strongest during austral summer (December\u2013February), reflecting drier conditions and a lack of effective infiltration, and is weakest during the wet austral winter (July\u2013September). The Sr\u2215Ca ratio is particularly sensitive to ENSO conditions due to the interplay of congruent or incongruent host rock dissolution, which manifests itself in lower Sr\u2215Ca in above-average warmer and wetter (La Ni\u00f1a-like) conditions. Our microclimatic observations at Waipuna Cave provide a valuable baseline for the rigorous interpretation of speleothem proxy records aiming at reconstructing the past expression of Pacific climate modes.
\r\n},
\r\nkeywords = {},
\r\npubstate = {published},
\r\ntppubtype = {article}
\r\n}
\r\n<\/pre><\/div>
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\r\n
\r\nCave microclimate and geochemical monitoring is vitally important for correct interpretations of proxy time series from speleothems with regard to past climatic and environmental dynamics. We present results of a comprehensive cave-monitoring programme in Waipuna Cave in the North Island of New Zealand, a region that is strongly influenced by the Southern Westerlies and the El Ni\u00f1o\u2013Southern Oscillation (ENSO). This study aims to characterise the response of the Waipuna Cave hydrological system to atmospheric circulation dynamics in the southwestern Pacific region in order to assure the quality of ongoing palaeo-environmental reconstructions from this cave.
\r\n
\r\nDrip water from 10 drip sites was collected at roughly monthly intervals for a period of ca. 3 years for isotopic (\u03b418O, \u03b4D, d-excess parameter, \u03b417O, and 17Oexcess) and elemental (Mg\u2215Ca and Sr\u2215Ca) analysis. The monitoring included spot measurements of drip rates and cave air CO2 concentration. Cave air temperature and drip rates were also continuously recorded by automatic loggers. These datasets were compared to surface air temperature, rainfall, and potential evaporation from nearby meteorological stations to test the degree of signal transfer and expression of surface environmental conditions in Waipuna Cave hydrochemistry.
\r\n
\r\nBased on the drip response dynamics to rainfall and other characteristics, we identified three types of discharge associated with hydrological routing in Waipuna Cave: (i) type 1 \u2013 diffuse flow, (ii) type 2 \u2013 fracture flow, and (iii) type 3 \u2013 combined flow. Drip water isotopes do not reflect seasonal variability but show higher values during severe drought. Drip water \u03b418O values are characterised by small variability and reflect the mean isotopic signature of precipitation, testifying to rapid and thorough homogenisation in the epikarst. Mg\u2215Ca and Sr\u2215Ca ratios in drip waters are predominantly controlled by prior calcite precipitation (PCP). Prior calcite precipitation is strongest during austral summer (December\u2013February), reflecting drier conditions and a lack of effective infiltration, and is weakest during the wet austral winter (July\u2013September). The Sr\u2215Ca ratio is particularly sensitive to ENSO conditions due to the interplay of congruent or incongruent host rock dissolution, which manifests itself in lower Sr\u2215Ca in above-average warmer and wetter (La Ni\u00f1a-like) conditions. Our microclimatic observations at Waipuna Cave provide a valuable baseline for the rigorous interpretation of speleothem proxy records aiming at reconstructing the past expression of Pacific climate modes.
\r\n<\/div>
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