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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.
Pages
Welcome!
About me
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Posts
Future Blog Post
Published:
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Blog Post number 4
Published:
This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.
Blog Post number 3
Published:
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Blog Post number 2
Published:
This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.
Blog Post number 1
Published:
This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.
fieldwork
labwork
IC
Ion chromatography (IC) is used to measure concentrations of major anions in water chemistry (cave dripwater, stream and spring, and rain event) analysis.
ICPMS
Inductively Coupled Plasma Mass Spectrometry (ICP-MS) measures trace element concentrations of solids (in-situ) attached to a laser (LA-ICP-MS) or diluted water samples attached to a quadrupole (ICP-Q-MS). I have analyzed trace element (Mg, Ba, Sr, Fe, Cu, Zn) concentrations of modern stalagmites, cave calcite precipitate on plates, cave dripwaters and spring and stream waters. A Multicollector-Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS) measures isotopic ratios of Uranium and Thorium that are used in stalagmite geochronology. I have prepared and analyzed tropical stalagmites for Uranium and Thorium ratios using a Neptune MC-ICP-MS.
IRMS
Isotope Ration Mass Spectroscopy (IRMS) has the capacity to measure stable isotopic compositions of oxygen, carbon, hydrogen, and nitrogen to name a few. I have prepared, analyzed a panoply of carbonate (stalagmites, corals, forams, paleosols) and water (cave dripwater, stream and spring water) samples with a Thermo Scientific MAT 253 IRMS attached to a KIEL IV, KIEL III, Gas Bench, and TCEA.
plato
publications
A two-year (2017 - 2019 CE) monitoring study to evaluate processes modulating elemental and isotopic variability in a karst system in southeastern New Mexico.
In Preparation for Journal of Hydrology (Lead Author).
A late Paleocene-early Eocene dissolution surface on a mid-latitude shallow carbonate platform, with paleoenvironmental implications
In Preparation for Geology.
Using high resolution X-Ray computed tomography to test the suitability and guide the preparation of stalagmites for paleoclimate reconstruction.
In Review at Journal of Cave and Karst Studies. (Lead Author)
Moving towards an understanding of transition metal variability controls in stalagmites: An assessment in sub-annually resolved 20th century stalagmites from semi-arid southwestern United States.
In Review at Geochemica Cosmochimica et Acta (Lead Author).
Evaluating model outputs using integrated global speleothem records of climate change since the last glacial.
Published:
Published in Earth System Science Data, 2018
Recommended citation: Atsawawanunt, K, L. Comas-Bru, S. A. Mozhdehi, M. Deininger, S. P. Harrison, A. Baker, and SISAL Working Group Members (2019). "The SISAL database: a global resource to document oxygen and carbon isotope records from speleothems." Earth System Science Data. https://doi.org/10.5194/essd-10-1687-2018
Speleothem Paleoclimatology for the Caribbean, Central America, and North America.
Published:
Published in Quarternary, 2019
Recommended citation: Oster, J. L., S. F. Warken, N. Sekhon, M. M. Arienzo, and M. Lachniet. (2019). "Speleothem Paleoclimatology for the Caribbean, Central America, and North America." Quarternary. https://doi.org/10.3390/quat2010005
Evaluating model outputs using integrated global speleothem records of climate change since the last glacial.
Published:
Published in Climate of the Past, 2019
Recommended citation: Comas-Bru, L., S.P. Harrison, M. Werner, K. Rehfeld, N. Scroxton, C. Veiga-Pires, and SISAL Working Group Members (2019). "Evaluating model outputs using integrated global speleothem records of climate change since the last glacial." Climate of the Past. https://doi.org/10.5194/cp-15-1557-2019
End of Green Sahara amplified mid- to late Holocene megadroughts in mainland Southeast Asia.
Published:
Published in Nature Communications, 2020
Recommended citation: Griffiths, M.L., K.R. Johnson, F.S.R. Pausata, J.C. White, G.M. Henderson, C.T. Wood, H. Yang, V. Ersek, C. Conrad and N. Sekhon. (2020). "End of Green Sahara amplified mid- to late Holocene megadroughts in mainland Southeast Asia." Quarternary. https://doi.org/10.1038/s41467-020-17927-6
Understanding climate trends in Central America through practical problem-based learning
Published:
Published in Journal of Geography in Higher Education, 2020
Recommended citation: Sekhon, N., Beach, T., Krause, S., and Eshleman, S. (2021). "Understanding climate trends in Central America through practical problem-based learning." Journal of Geography in Higher Education. https://www.tandfonline.com/doi/full/10.1080/03098265.2020.1833318
Diurnal to seasonal ventilation in Brazilian caves
Published:
Published in Global and Planetary Change, 2020
Recommended citation: Sekhon, N., Novello, V. F., Cruz, F. W., Wortham, B. E., Ribeiro, T. G., and Breecker, D. O. (2021). "Diurnal to seasonal ventilation in Brazilian caves." Global and Planetary Change. https://doi.org/10.1016/j.gloplacha.2020.103378
Regional patterns in Miocene-Pliocene aridity across the Chinese Loess Plateau revealed by high resolution records of paleosol carbonate and occluded organic matter
Submitted at Earth and Planetary Science Letters.
Global reorganization of atmospheric circulation during Dansgaard-Oeschger cycles
Submitted at Science Advances.
scicom
service
talks
Southeast Asian Monsoon Variability during the Holocene Based on Speleothems from Laos.
Published:
Yang, H., K.R. Johnson, M. Griffiths, N. Sekhon, A. LeGrande, K. Yoshemura, V Ersek, H. Gideon. Southeast Asian Monsoon Variability during the Holocene Based on Speleothems from Laos.
Holocene tropical hydroclimate reconstruction from speleothem oxygen isotopes.
Published:
Sekhon, N., K.R. Johnson, H. Yang. Holocene tropical hydroclimate reconstruction from speleothem oxygen isotopes.
Proposed work to investigate recent SPCZ rainfall changes using cave deposits from the South Pacific.
Published:
Sekhon, N., T. M. Quinn, J. W. Partin, R.L. Edwards, H. Cheng, P. Zhang. Proposed work to investigate recent SPCZ rainfall changes using cave deposits from the South Pacific.
Investigating recent SPCZ rainfall variability using a Stalagmite from the Solomon Islands: Initial Report.
Published:
Sekhon, N., T. M. Quinn, J. W. Partin, R.L. Edwards, H. Cheng, P. Zhang. Investigating recent SPCZ rainfall variability using a Stalagmite from the Solomon Islands: Initial Report.
Assessing multi-decadal rainfall variability in the South Pacific Convergence Zone using the geochemistry of stalagmites from the Solomon Islands.
Published:
AGU Abstract #PP51A-2260
Multidecadal rainfall variability in the South Pacific Convergence Zone using the geochemistry of stalagmites from theSolomon Islands.
Published:
Sekhon, N., T. M. Quinn, J. W. Partin, R.L. Edwards, Hai Cheng, Pu Zhang. Multidecadal rainfall variability in the South Pacific Convergence Zone using the geochemistry of stalagmites from the Solomon Islands.
Near entrance Speleothems: Archives of seasonality?
Published:
GSA South-Central Abstract #2-6
Global Stacking of Speleothem Carbon and Oxygen Isotope Records.
Published:
Breecker, D. O. and N. Sekhon. Global Stacking of Speleothem Carbon and Oxygen Isotope Records.
Seasonally-resolved trace element concentrations in stalagmites from a shallow cave in New Mexico.
Published:
AGU Abstract #PP51C-1074
Insights From The Geochemistry of Stalagmite: Examining Local Hydroclimate Variability In Semi-Arid New Mexico.
Published:
Water, Climate, Environment Informal Seminar Series at the Department of Geological Sciences, UT Austin.
High-Resolution Stalagmite Reconstruction Examining Local Hydroclimate Variability From A Shallow Cave in Semi-Arid New Mexico
Published:
GSA Abstract #89-12
Composite data set of last glacial Dansgaard/Oeschger events obtained from stable oxygen isotopes in speleothems
Published:
EGU Abstract # EGU2020-6894
A two-year source to sink monitoring study to interpret elemental and isotopic variability in a karst system in southeastern New-Mexico
Published:
GSA Abstract #359380
A study of seasonal hydroclimate variability in southwestern United States: Geochemical insights from stalagmites and karst monitoring.
Published:
Invited Talk: A study of seasonal hydroclimate variability in southwestern United States: Geochemical insights from stalagmites and karst monitoring.
Transition metal concentrations as recorders of drought terminations: An assessment using the geochemistry of two coeval stalagmites that grew between 1930 and 2009 C.E. from semi-arid New Mexico.
Published:
Invited Talk: Transition metal concentrations as recorders of drought terminations: An assessment using the geochemistry of two coeval stalagmites that grew between 1930 and 2009 C.E. from semi-arid New Mexico
teaching
Teaching Assistant
Teaching Assistant, UT Austin, Department of Geological Sciences, 2016
Taught two - three sections (15 - 20 students per section) of major and non-major geology undergraduate labs per week. Duties included grading assignments, leading lab discussions, and updating teaching slides.
Guest Instructor
Guest Instructor, UT Austin, Department of Geography and the Environment, 2018
Wrote a lesson plan for instructors at institutes of higher education to teach pertinent climate change topics using the example of the Maya Lowlands. Lesson plan is published online and available to the public. The results were published in Journal of Geography in Higher Education. The lesson plan was tested over two semesters where I was the guest instructor.
Field Assistant Instructor
Field Assistant Instructor, UT Austin, Environmental Science Institute, 2018
Duties including organizing field trips at a local and state level for 30 students, ordering gear for each field trip, updating field seminar assignments with co-field teaching assistant and Professors, driving vans and suburbans with students, leading coastal ecology field trips on R/V Katy based at the Marine Science Institute, Port Aransas. Class aimed at junior and senior environmental science majors.