http://www.andreaerhardt.com/news daily 0.75 2016-02-23 http://www.andreaerhardt.com/classes daily 0.75 2019-12-27 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1477017339377-S1R265RVW0DOOJ4P7K80/periodic+table.png Classes http://www.andreaerhardt.com/location daily 0.75 2016-02-23 http://www.andreaerhardt.com/speleothems daily 0.75 2021-06-14 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1623700710164-YMN24VOXPPVT0AC0PDQ6/Screen+Shot+2021-06-14+at+3.58.06+PM.png Calcium Isotopes in Speleothems - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1623700843634-D9R9OJR4D28FRTORO2SS/Screen+Shot+2021-06-14+at+4.00.10+PM.png Calcium Isotopes in Speleothems Figure 2 from Magiera et al. (2019). Local and regional Indian Summer Monsoon precipitation dynamics during Termination II and the Last Interglacial, Geophysical Research Letters https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1477359213415-S8M6X63WR4X0OAS4PXWP/Luray_cavern_stalactites_and_stalagmites.jpg Calcium Isotopes in Speleothems http://www.andreaerhardt.com/paleoceanography daily 0.75 2022-10-11 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1615775531195-HO0M4VSWC5G0ZTSPOB1K/Reis+Summary.jpg Paleoceanography Lithostratigraphic column showing the recovery at Site U1553 along with relevent geochemical results. Left to right: pore water sulfate, sedimentary sulfur, headspace methane. Modified from Thomas et al., 2020. Sample intervals for the proposed research outlined in red on the stratigraphic column. Interval for my ongoing research are highlighted in blue. https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1615775717110-0NX4A8KEDDM56ZHEFNEU/Fg3+Three+Maps.jpg Paleoceanography 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb results from core top sediment detrital fractions across the Pacific Ocean measured for this study (outlined in dark circles) and published data (Godfrey, 2002; Hyeong et al., 2011; Jones et al., 2000; Pettke et al., 2000; Stancin et al., 2006, 2008; Xie and Marcantonio, 2012). Warmer colors represent more radiogenic ratios, and cooler colors less radiogenic ratios. Results for source regions are listed on the figure. 1Published results from Stancin et al. (2006) calculated from analysis of core top data; 2Published ratios measured on the silicate (detrital) fraction of Chinese loess by Jones et al. (2000); 3Published results of pre-anthropogenic Saharan dust compiled by Abouhami and Zabel (2003); 3Published results for Papua New Guinea from Park et al. (2010). ITCZ summer (red) and winter (green) from Liu et al. (2015). https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1475851749404-8DGAYYAHQPK4LTAI1MIT/Erhardt+et+al+Figure+4.jpg Paleoceanography http://www.andreaerhardt.com/diagenesis daily 0.75 2022-10-11 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540778604635-6V8EH5IWA50UJSVD4TJT/IMG_9816.JPG Carbonate Diagenesis https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1482291127392-FXNM5LL1404EJQYV0WYJ/image-asset.png Carbonate Diagenesis https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1477358863849-PU7K9RO96MIRJKNUJZRK/A_001+%281%29.JPG Carbonate Diagenesis http://www.andreaerhardt.com/people daily 0.75 2022-10-12 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577486185198-R4HW7WR3PTLTXADOL2AN/Snapchat-1725143388.jpg People - Lucy Steiner https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1477355379944-8FHFPR55YT4Q8Q7IO94G/IMG_1152.JPG People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/66b1d386-0830-4fbf-aaa6-d352fd674955/IMG_8820.jpg People - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1615737735240-WV89K6ABM1S7JQV349VG/IMG_1906.jpg People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1580522372647-RE093XE65O4MTJJTKHI6/Sanders_pic.jpg People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577483078916-1IFRSNHL5U22FM0MOU3Y/Riyam.jpg People - Riyam Al Riyami Riyam Rimani https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1580522239709-UK4JUP1P6SLE32PH0QCT/Resized_20180113_140748.jpg People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577484326721-KDD6VZPER5RMB14PHU89/IMG_3250.jpg People - Bailee Morrison Graduated Winter 2019 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577547115494-DEK0HVF3GOLHHGZ2NLZL/Jen%2BPic.jpg People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1580783459798-FHEI2NPLXZPD3XIP64JA/Website+Picture.jpg People - Kelly Lynch Graduated Spring 2020, Now at NASA https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577486057407-CC0AGEOA7K64JVR5MH1Y/IMG_5275.jpg People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577547543996-CJZXRDVZPO2OP4FFFLZ1/Wilson_GRCA_picture.jpg People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1615737627191-PHYF43LJB5BNB19UJJHU/Blanca.jpg People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577483133333-A7BE83WOULQ4B1BWPWUM/26983.jpg People - Cailey Bechtol Graduated Spring 2018 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577499581823-5ZAS2YV35SCZYI5XRZLB/Avery.jpg People https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577483221005-XXYTCHLTQ5LOJ4I1R5OQ/Field%2Bwork%2B3.jpg People - Holly Young Graduated Spring 2018 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577485375826-FK9CGHA5QAZDA29ZKCON/IMG_4271.jpg People - 2017 Erhardt Lab Holiday Extravaganza! https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577485595188-O3PXJKIN1VLBN54UENCI/IMG_4707.jpg People - 2018 Erhardt Lab Holiday Party Extravaganza! https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577484739376-ELRQTVBVPR01TNHHPDAI/IMG_5140.jpg People - 2019 Erhardt Lab Holiday Party Extravaganza! https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1615736685309-BF9GFWETZ7V5T0MYFM70/IMG_6914.JPG People - 2020 Erhardt Lab Celebrate at Home https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1665498221824-2P93VG0WRDAN7U8U47EQ/IMG_7556%252B%2525281%252529.jpg People - The graduating undergrads! 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James Thompson Now at Eastern Kentucky University https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1477362577027-M5MQDVNRMAUOOHGADLVG/IMG_2301.JPG People http://www.andreaerhardt.com/contact daily 0.75 2016-10-25 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1477357717853-S8XD5ZK8QPRXDHO53PKM/IMG_2159.JPG Contact http://www.andreaerhardt.com/facilities daily 0.75 2018-10-28 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1482268628023-G5YUIERTS8GTCFR9F63F/image-asset.jpeg Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540691902048-S2TGWY0KXDY5QQJ2Q0L9/IMG_9844.JPG Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540692390809-UEN04SOVLKJZFE0RLW4G/IMG_9774.JPG Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540695970550-GF27AU7YTCZHPCDCIS26/UKSIGL_Logo_Horizontal2_Bordered_Med.png Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1482269026009-K9D1KZHAROS7V16L9Q8M/image-asset.jpeg Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540693755746-DXU1HXXDZCLSN12JWKIG/IMG_9786.JPG Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540692246234-TCBCB07W6GEVMXO1VYCO/IMG_9784.JPG Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540694060927-OD4UO7EDHMSL10L0BV4B/IMG_9760.JPG Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1482288275676-MIFSGJCFCLJC7X7D0FOX/DSC_0075.JPG Laboratory Facilities - 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Laminar Flow Hood https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540693664203-KSVYUES4F52BBO5K6OZ5/IMG_9865.JPG Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540695705319-NAH8W0TZB8EAFRJ8JYFY/UKSIGL_Logo_Horizontal2_Bordered_Med.png Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540694270536-MKHQ04JSWS8T56O0JF8M/CS8A1133.jpg Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1482268592763-M0E0AFO8SQ3ZGIAJ0YR9/DSC_0057.JPG Laboratory Facilities https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540695892169-YYWHAIB4IFVK3829JIBP/IMG_9895.JPG Laboratory Facilities http://www.andreaerhardt.com/menu daily 0.75 2016-10-07 http://www.andreaerhardt.com/pagecv daily 0.75 2022-10-11 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1477360525421-K2H1YETSKBMH97A4M2OU/A_037.JPG CV http://www.andreaerhardt.com/opportunities daily 0.75 2022-10-11 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1482267368457-E5QYQM1PZ2S7FYRM4RPA/13112866_10153700112399053_5216530890779898219_o.jpg Opportunities http://www.andreaerhardt.com/home daily 1.0 2022-10-12 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540688764808-7IOMR0EG9N9B6X4R2G62/UKSIGL_Logo_FullFlat_Border_Med.png Erhardt Geochemistry Laboratory https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1477361430382-1FW6ZD2WGQTISWKX2OB4/image-asset.jpeg Erhardt Geochemistry Laboratory https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540773533806-B526A30HI4GUZO1WH5NC/sampling_dissolved_gases.jpg Erhardt Geochemistry Laboratory https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577501452826-9CULB6QGEZQBX38JDPP0/GC+overview.jpg Erhardt Geochemistry Laboratory https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577501704780-048ZEKE94UV4GGRGO2NN/image.jpg Erhardt Geochemistry Laboratory https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577501565897-7UQ6NXFLP61UUD22I5B5/image.jpg Erhardt Geochemistry Laboratory https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1577501480227-C2FB7ZS5BD9X1I63RO53/IMG_0415.jpg Erhardt Geochemistry Laboratory https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1482252447021-FR1BJYI1FIC39ABLM4SP/image-asset.jpeg Erhardt Geochemistry Laboratory Dr. Andrea https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540780628854-JIRR3HCYS8PKBFXY69AC/IMG_0577.JPG Erhardt Geochemistry Laboratory http://www.andreaerhardt.com/petroleum-geology daily 0.75 2019-12-28 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540780225500-9HS2K9RG4TE2IVYW3CWC/Screenshot+2018-10-28+21.54.29.png Petroleum Geology https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540775709660-NADKGB8OL98ERRDCSC3S/san+andres.png Petroleum Geology https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540779847058-5TH744U04QXOGV9RFSL5/IMG_0853.JPG Petroleum Geology https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540779410967-1H28PGZZ9STQEGTDLBC6/wolfcamp.png Petroleum Geology https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540777158118-BHNIXC2IK3BR45BJY3EX/IMG_0370.JPG Petroleum Geology https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540748050985-AQSN83GRLY0O1LO32GDA/IMG_0364.JPG Petroleum Geology http://www.andreaerhardt.com/water-chemistry daily 0.75 2022-10-12 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/d3215647-cd1f-41a8-81d8-1ee74d4e9e9c/graph.jpg Water Chemistry - Make it stand out *Avery, E., Samonina, O., Kryshtop, L., Vyshenska, I., Fryar, A.E., Erhardt, A.M., (2022). Precipitation patterns in Ukraine as derived for water isotope analysis. Isotopes in Environmental and Health Studies. https://doi.org/10.1080/10256016.2022.2131781. https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/165d9c94-f9ad-40b1-a815-9caed9690cb6/Screen+Shot+2022-10-12+at+11.46.06+AM.png Water Chemistry - Make it stand out *Avery, E., Samonina, O., Vyshenska, I., Fryar, A.E., Erhardt, A.M. Variation of tap-water isotope ratios and municipal water sources across Kyiv city, Ukraine. Under review at Discover Water. https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1623701991233-C5ZQJNE0TSMCI2F8WDGG/Screen+Shot+2021-06-14+at+4.19.28+PM.png Water Chemistry https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540772693359-E9SV5SVDSYWNBNSMNE0U/WellsKentucky.jpg Water Chemistry http://www.andreaerhardt.com/grand-canyon-groundwater daily 0.75 2021-06-14 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1623713772789-3W4PT02EC4QUHK9P2CEG/Screen+Shot+2021-06-14+at+7.35.33+PM.png Environmental Geochemistry IIsotopic analyses for δ13C of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) can provide insight into the carbon cycling of a groundwater system. Dissolved organic carbon in groundwater is sourced from the leeching of organic acids from terrestrial vegetation and humic matter in soil during infiltration of precipitation. The resulting δ13C-DOC of the groundwater retains its terrestrial signature which will vary depending on metabolic pathways in the vegetative cover (C3, C4, or CAM) which can comprise a range in δ13C from ca. -33 to -10 ‰. DIC can be sourced from vegetation and humic matter as well although it can be altered in groundwater systems by processes such as microbial activity and carbonate dissolution. Thus, the δ13C-DIC of a groundwater system can be used as a tracer in order to characterize spring systems as springs that share a groundwater system will show similar fractionation trends in δ13C-DIC resulting from a given flow systems unique microbial biome and preferential dissolution of carbonate strata. The Shivwits Plateau in western Grand Canyon National Park (GRCA) is relatively unstudied due to difficulty of access and wilderness designation, resulting in difficulty of completing traditional groundwater studies and thus requires a variety of tracer studies to characterize flow patterns. Utilizing δ13C of DIC and DOC in a remote karstic system such as the Shivwits Plateau can provide useful parameters for characterizing springs in either low- or high-resolution sampling. δ13C-DIC analyses have been completed for samples collected during high flow conditions from 14 springs across the Shivwits Plateau showing variation in δ13C-DIC from -13.8 to -6.4 ‰. δ13C-DOC results will be compared with δ13C-DIC and existing vegetation maps to help characterize water sources and flow paths. These methods could be employed in future studies to improve understanding of flow paths and enhance water management practices in Grand Canyon and elsewhere. https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540777502672-5DLQ9HYSNGVQNOOAWYB5/Screenshot+2018-10-28+21.06.26.png Environmental Geochemistry https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540777459946-UHQ6EH5D8C30IVCWQC40/Rhizones.jpg Environmental Geochemistry https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1540774314615-IHOLYMFJ6YKWT386XYBI/Forepole+Creek+Flooded.jpg Environmental Geochemistry http://www.andreaerhardt.com/cicada daily 0.75 2021-06-15 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1623714854231-4WBK6WTQRSXEXLW0J6ZS/Periodical_vs_Annual_cicada.png Cicadas! Periodic vs Annual Cicada https://extension.entm.purdue.edu/cicadas/ https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1623714701627-1UDO6OVG5LSC37HO8YCS/PXL_20210527_131034588.jpg Cicadas! http://www.andreaerhardt.com/diversity-in-science daily 0.75 2022-10-12 https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/b4de293b-ac07-4615-9932-f1475802da4c/AARPROGRAM_3.jpeg Diversity in Science https://images.squarespace-cdn.com/content/v1/57f6f244d2b8573e8813af73/1665568834263-S0O8YMCTRJ5M3WS5ZV7D/Screen+Shot+2022-10-12+at+11.59.03+AM.png Diversity in Science http://www.andreaerhardt.com/new-page daily 0.75 2024-03-04