Sidney Ann Rasbury Hemming
Alma materState University of New York at Stony Brook
Scientific career
InstitutionsLamont–Doherty Earth Observatory
ThesisPb isotope studies of sedimentary rocks and detrital components for provenance analysis (1994)
Doctoral advisorScott McLennan

Sidney Hemming is an analytical geochemist known for her work documenting Earth's history through analysis of sediments and sedimentary rocks. She is a professor of earth and environmental sciences at Columbia University.

Education and career

Hemming earned a BS from Midwestern University in 1983 and an MS from Tulane University in 1986.[1] In 1994 she earned her PhD from Stony Brook where she studied lead isotopes in sedimentary rocks.[2] In 1994, Hemming started a postdoc with Wally Broecker at Lamont–Doherty Earth Observatory.[3][4] As of 2021, Hemming is a professor of earth and environmental sciences at Lamont–Doherty Earth Observatory.

In 2018, Hemming was named a fellow of the American Geophysical Union who cited her "for the development of geochemical and isotopic tracers for sediments to reveal geological processes and events through Earth's history".[5] In 2021, Hemming received a Guggenheim Fellowship which she plans to use to study the time period between the Pliocene and the Pleistocene.[4]

Research

Hemming's research documents changes in Earth's history using the chemical signals in sedimentary rocks and sediments. She uses geochronology to obtain age estimates of events occurring in the ocean thereby tracking changes in water circulation, winds, and glaciers. She has used neodymium isotopes to track rapid changes in Antarctic Intermediate Water[6] and changes in North Atlantic Deep Water.[7] In the southern Ocean, Hemming has used strontium isotopes in sediments to track changes in the strength of the Agulhas current during the Last Glacial Maximum[8] and constrained the location of the Antarctic Circumpolar Current.[9] In California, her research on past climate conditions at Mono Lake[10][11] revealed chemical signatures in the sediments recorded the Laschamp event, a global geomagnetic shift.[12][13][14] In the North Atlantic Ocean, Hemming's research on Heinrich events[15] has constrained the amount of ice-rafted debris moved by icebergs into the North Atlantic Ocean.[16]

Selected publications

Awards and honors

References

  1. ↑ "sidney | Lamont–Doherty Earth Observatory". www.ldeo.columbia.edu. Retrieved August 14, 2021.
  2. ↑ Hemming, Sidney Ann Rasbury (1994). Pb isotope studies of sedimentary rocks and detrital components for provenance analysis (Thesis). OCLC 31235173.
  3. 1 2 "John Simon Guggenheim Foundation | Sidney R. Hemming". Retrieved August 15, 2021.
  4. 1 2 3 "Sidney Hemming, Paleoclimate Detective, Wins Guggenheim Fellowship". State of the Planet. April 13, 2021. Retrieved August 15, 2021.
  5. 1 2 "Hemming". Honors Program. Retrieved August 14, 2021.
  6. ↑ Pahnke, Katharina; Goldstein, Steven L.; Hemming, Sidney R. (2008). "Abrupt changes in Antarctic Intermediate Water circulation over the past 25,000 years". Nature Geoscience. 1 (12): 870–874. Bibcode:2008NatGe...1..870P. doi:10.1038/ngeo360. ISSN 1752-0894.
  7. ↑ Rutberg, Randye L.; Hemming, Sidney R.; Goldstein, Steven L. (2000). "Reduced North Atlantic Deep Water flux to the glacial Southern Ocean inferred from neodymium isotope ratios". Nature. 405 (6789): 935–938. Bibcode:2000Natur.405..935R. doi:10.1038/35016049. ISSN 1476-4687. PMID 10879531. S2CID 205007120.
  8. ↑ Franzese, Allison M.; Hemming, Sidney R.; Goldstein, Steven L. (2009). "Use of strontium isotopes in detrital sediments to constrain the glacial position of the Agulhas Retroflection". Paleoceanography. 24 (2): n/a. Bibcode:2009PalOc..24.2217F. doi:10.1029/2008PA001706. ISSN 1944-9186.
  9. ↑ Hemming, S. R.; Flierdt, T. van de; Goldstein, S. L.; Franzese, A. M.; Roy, M.; Gastineau, G.; Landrot, G. (2007). "Strontium isotope tracing of terrigenous sediment dispersal in the Antarctic Circumpolar Current: Implications for constraining frontal positions". Geochemistry, Geophysics, Geosystems. 8 (6): n/a. Bibcode:2007GGG.....8.6N13H. doi:10.1029/2006GC001441. ISSN 1525-2027. S2CID 13915405.
  10. ↑ "Climate change and the future of Mono Lake". phys.org. December 13, 2013. Retrieved August 15, 2021.
  11. ↑ Colman, S. M.; Hemming, S. R.; Stine, S.; Zimmerman, S. R. H. (2014). "The effects of recent uplift and volcanism on deposition in Mono Lake, California, from seismic-reflection (CHIRP) profiles: MONO LAKE CHIRP". Journal of Geophysical Research: Solid Earth. 119 (5): 3955–3970. doi:10.1002/2013JB010726.
  12. ↑ Kent, D.V.; Hemming, S.R.; Turrin, B.D. (April 2002). "Laschamp Excursion at Mono Lake?". Earth and Planetary Science Letters. 197 (3–4): 151–164. Bibcode:2002E&PSL.197..151K. doi:10.1016/S0012-821X(02)00474-0. ISSN 0012-821X.
  13. ↑ Zimmerman, Susan H.; Hemming, Sidney R.; Kent, Dennis V.; Searle, Stephanie Y. (2006). "Revised chronology for late Pleistocene Mono Lake sediments based on paleointensity correlation to the global reference curve". Earth and Planetary Science Letters. 252 (1–2): 94–106. Bibcode:2006E&PSL.252...94Z. doi:10.1016/j.epsl.2006.09.030. S2CID 53422433.
  14. ↑ Cox, Stephen E.; Farley, Kenneth A.; Hemming, Sidney R. (2012). "Insights into the age of the Mono Lake Excursion and magmatic crystal residence time from (U‐Th)/He and 230Th dating of volcanic allanite". Earth and Planetary Science Letters. 319–320: 178–184. Bibcode:2012E&PSL.319..178C. doi:10.1016/j.epsl.2011.12.025.
  15. ↑ Hemming, Sidney R. (2004). "Heinrich events: Massive late Pleistocene detritus layers of the North Atlantic and their global climate imprint". Reviews of Geophysics. 42 (1). Bibcode:2004RvGeo..42.1005H. doi:10.1029/2003RG000128. ISSN 1944-9208. S2CID 53526029.
  16. ↑ Downing, Greg E.; Hemming, Sidney R.; Jost, Anne; Roy, Martin (September 30, 2013). "40Ar/39Ar hornblende provenance clues about Heinrich event 3 (H3)". Geological Society, London, Special Publications. 378 (1): 245–263. doi:10.1144/sp378.18. ISSN 0305-8719. S2CID 128891292.
  17. ↑ "GSA Fellowship". www.geosociety.org. Retrieved August 15, 2021.
  18. ↑ "About the Geochemistry Fellow Honor". Retrieved August 15, 2021.
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