Now showing items 125-130 of 130

    • Understanding long-term carbon cycle trends: The late Paleocene through the early Eocene 

      Komar, N.; Zeebe, R.E.; Dickens, G.R. (2013)
      [1] The late Paleocene to the early Eocene (~58–52 Ma) was marked by significant changes in global climate and carbon cycling. The evidence for these changes includes stable isotope records that reveal prominent decreases ...
    • Upper mantle tomography in the northwestern Pacific region using triplicated P waves 

      Takeuchi, Nozomu; Kawakatsu, Hitoshi; Tanaka, Satoru; Obayashi, Masayuki; Chen, Y. John; Ning, Jieyuan; Grand, Steve P.; Niu, Fenglin; Ni, James; Iritani, Rryohei; Idehara, Koki; Tonegawa, Takashi (2014)
      We conducted delay time tomography of the upper mantle beneath the northwestern Pacific using P data from NorthEast China Extended SeiSmic Array, F-net, and nearby available stations. To improve resolution and accuracy in ...
    • Valuing the Air Quality Effects of Biochar Reductions on Soil NO Emissions 

      Pourhashem, Ghasideh; Rasool, Quazi Z.; Zhang, Rui; Medlock, Kenneth B.; Cohan, Daniel S.; Masiello, Caroline A. (2017)
      While it is clear that biochar can alter soil N2O emissions, data on NO impacts are scarce. Reports range from 0 to 67% soil NO emission reductions postbiochar amendment. We use regional air quality and health cost models ...
    • Velocity structure of the uppermost mantle beneath East Asia from Pn tomography and its dynamic implications 

      Wang, Suyun; Niu, Fenglin; Zhang, Guomin (2013)
      [1] East Asia is one of the most tectonically active regions on Earth's surface due to the collision from the India plate and the suctions induced by the subduction of the Pacific and Philippine plates. To better understand ...
    • Volcanic ash as a driver of enhanced organic carbon burial in the Cretaceous 

      Lee, Cin-Ty A.; Jiang, Hehe; Ronay, Elli; Minisini, Daniel; Stiles, Jackson; Neal, Matthew (2018)
      On greater than million year timescales, carbon in the ocean-atmosphere-biosphere system is controlled by geologic inputs of CO2ᅠthrough volcanic and metamorphic degassing. High atmospheric CO2ᅠand warm climates in the ...
    • A window for plate tectonics in terrestrial planet evolution? 

      O’Neill, Craig; Lenardic, Adrian; Weller, Matthew; Moresi, Louis; Quenette, Steve; Zhang, Siqi (2016)
      The tectonic regime of a planet depends critically on the contributions of basal and internal heating to the planetary mantle, and how these evolve through time. We use viscoplastic mantle convection simulations, with ...