In press/In review:

Helliker BR, Noone D. 2009. Novel approaches to spatial monitoring of water vapor isotope ratios. In, Isocapes: Understanding movement, pattern, and process on Earth through isotope mapping. Eds. Bowen G, West J, Tu K, Dawson T. In press.

Published:
1. Helliker BR, Richter SL. 2008. Subtropical to Boreal convergence of tree-leaf temperatures: an isotopic analysis. Nature 454:511-514. [PDF]2008_HnR_nature
With News and Views article by IF Woodward. [PDF]2008_woodwardNnV

2. Helliker BR, Griffiths H. 2007. Towards a plant-based proxy for the isotope ratio of atmospheric water vapor. Global Change Biology 13:723-733. doi: 10.1111/j.1365-2486.2006.01325.x [PDF] 2007_GCB_HnG
3. Han LF, Groening M, Aggarwal P, Helliker BR. 2006. Reliable determination of oxygen and hydrogen isotope ratios in atmospheric water vapour adsorbed on 3A molecular sieve. Rapid Communications in Mass Spectrometry, 20: 3612-3618. [PDF]2006_Han_RCMS

4. Lai CT, Schauer AJ, Owensby C, Ham JM, Helliker BR, Tans PP, Masarie K, Ehleringer JR. 2006. Regional CO2 fluxes inferred from mixing ratio measurements: estimates from flasked air samples in central Kansas, USA. Tellus, 58B 523-536. DOI: 10.1111/j.1600-0889.2006.00203. [PDF] 2006_Lai_Tellus

5. Helliker BR, Berry JB, Betts AK, Bakwin P, Davis K, Ehleringer J, Butler MP, Ricciuto DM. 2005. Regional-scale estimates of forest CO2 and isotope flux based on monthly CO2 budgets of the atmospheric boundary layer. In: Carbon Balance in Forest Biomes. Eds. Griffiths H, Jarvis P. Bios. 2005. [PDF]

6. Helliker BR, Berry JA, Betts AK, Davis K, Miller J, Denning AS, Bakwin P, Ehleringer J, Butler MP, Ricciuto D. 2004. Estimates of net CO2 flux by application of equilibrium boundary layer concepts to CO2 and water vapor measurements from a tall tower. Journal of Geophysical Research- Atmospheres, 109, D20106 10.1029/2004JD004532 [PDF] 2004_JGR_Helletal

7. Betts AK, Helliker BR, Berry JA. 2004. Coupling between CO2, water vapor, temperature and radon and their fluxes in an idealized equilibrium boundary layer over land. Journal of Geophysical Research- Atmospheres. 109, D18103, doi:10.1029/2003JD004420 [PDF] 2004_JGR_BHB

8. Still CJ, Riley W, Helliker BR, Berry JA. 2004. Simulation of ecosystem C18OO isotope fluxes in a tallgrass prairie: biological and physical controls. In: Stable Isotopes and Biosphere-Atmosphere Interactions. Eds. Flanagan LB, Ehleringer JR, Pataki DE. Elsevier-Academic Press. [PDF]

9. Riley WJ, Still CJ, Helliker BR, Ribas-Carbo M, Verma SB, and Berry JA. 2003. 18O composition of CO2 and H2O ecosystem pools and fluxes in a tallgrass prairie: Simulations and comparisons to measurements. Global Change Biology, 9: 1567- 1581. [PDF] 2003_GCB_Rileyetal

10. Still CJ, Berry JA, Ribas-Carbo M, Helliker B, Verma SB. 2003. The contribution of C3 and C4 plants to the carbon cycle of a tallgrass prairie: an isotopic approach. Oecologia, 136: 347-359. [PDF]
2003_Oec_stilletal

11. Kamler, JF, Ballard WB, Helliker BR, and Stiver S. 2003. Range expansion of raccoons in western Utah and central Nevada. Western North American Naturalist 63:406-408. [PDF]

12. Helliker BR, Ehleringer JR. 2002. Grass blades as tree rings: environmentally induced changes in the oxygen isotope ratio of cellulose along the length of grass blades. New Phytologist 155: 417. [PDF] 2002_newph_HnE

13. Helliker BR, Ehleringer JR. 2002. Differential 18O enrichment in leaf cellulose of C3 versus C4 grasses. Functional Plant Biology (formerly Australian J. of Plant Physiology) 29: 435-442 [PDF] 2002_FPB_HnE

14. Ehleringer JR, Bowling DR, Flanagan LB, Fessenden J, Helliker BR, Martinelli LA, Ometto JP. 2002. Stable isotopes and carbon cycle processes in forest and grasslands. Plant Biology 4: 181-189 [PDF] 2002_PlaBio_ehletal

15. Helliker, BR, Roden J, Cook C, Ehleringer, JR. 2002. A rapid and precise method for sampling and determining the oxygen isotope ratio of atmospheric water vapor. Rapid Communications in Mass Spectrometry 16: 929-932 [PDF] 2002_RCMS_Helletal

16. Griffiths H, Helliker B, Roberts A, Haslam RP, Girnus J, Robe WE, Borland AM, Maxwell K. 2002. Regulation of Rubisco activity in crassulacean acid metabolism plants: better late than never. Functional Plant Biology 29: 689-696 [PDF] 2002_FPB_griffetal

17. Helliker BR, Ehleringer JR. 2000. Establishing a grassland signature in veins: 18O in the leaf water of C3 and C4 grasses. Proceedings of the National Academy of Sciences (USA) 97: 7894-7898. [PDF] 2000_HnE_pnas
18. Maxwell K, Borland AM, Haslam RP, Helliker BR, Roberts A, Griffiths H. 1999. Modulation of Rubisco activity during the diurnal phases of the Crassulacean Acid Metabolism plant Kalanchoe daigremontiana. Plant Physiology 121: 849-856. [PDF] 1999_maxetal_PPhys

19. Helliker BR, Martin CE. 1997. Comparative water-use efficiencies of three species of Peperomia (Piperaceae) having different photosynthetic pathways. Journal of Plant Physiology 150: 259-263. [PDF] 1997_HnM_JPP

20. Ehleringer JR, Cerling TE, Helliker BR. 1997. C4 photosynthesis, atmospheric CO2, and climate. Oecologia 112: 285-299. [PDF] 1997_Ehl_etal