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Sökning: WFRF:(HAKKINEN J) > (2015-2019)

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  • Chafik, L., et al. (författare)
  • Global linkages originating from decadal oceanic variability in the subpolar North Atlantic
  • 2016
  • Ingår i: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 43:20, s. 10909-10919
  • Tidskriftsartikel (refereegranskat)abstract
    • The anomalous decadal warming of the subpolar North Atlantic Ocean (SPNA), and the northward spreading of this warm water, has been linked to rapid Arctic sea ice loss and more frequent cold European winters. Recently, variations in this heat transport have also been reported to covary with global warming slowdown/acceleration periods via a Pacific climate response. We here examine the role of SPNA temperature variability in this Atlantic-Pacific climate connectivity. We find that the evolution of ocean heat content anomalies from the subtropics to the subpolar region, likely due to ocean circulation changes, coincides with a basin-wide Atlantic warming/cooling. This induces an Atlantic-Pacific sea surface temperature seesaw, which in turn, strengthens/weakens the Walker circulation and amplifies the Pacific decadal variability that triggers pronounced global-scale atmospheric circulation anomalies. We conclude that the decadal oceanic variability in the SPNA is an essential component of the tropical interactions between the Atlantic and Pacific Oceans.
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  • Hakkinen, P., et al. (författare)
  • Charge Sensitivity Enhancement via Mechanical Oscillation in Suspended Carbon Nanotube Devices
  • 2015
  • Ingår i: Nano Letters. - : American Chemical Society (ACS). - 1530-6992 .- 1530-6984. ; 15:3, s. 1667-1672
  • Tidskriftsartikel (refereegranskat)abstract
    • Single electron transistors (SETs) fabricated from single-walled carbon nanotubes (SWNTs) can be operated as highly sensitive charge detectors reaching sensitivity levels comparable to metallic radio frequency SETs (rf-SETs). Here, we demonstrate how the charge sensitivity of the device can be improved by using the mechanical oscillations of a single-walled carbon nanotube quantum dot. To optimize the charge sensitivity dQ, we drive the mechanical resonator far into the nonlinear regime and bias it to an operating point where the mechanical third order nonlinearity is canceled out. This way we enhance dQ, from 6 mu e/(Hz)(1/2) for the static case to 0.97 mu e/(Hz)(1/2) at a probe frequency of similar to 1.3 kHz.
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