Browsing NORCE vitenarkiv by Author "Otterå, Odd Helge"

Now showing items 1-11 of 11

    • The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation 

      Guttu, Sigmund; Orsolini, Yvan J.; Stordal, Frode; Otterå, Odd Helge; Omrani, Nour-Eddine (Peer reviewed; Journal article, 2021)
      The stratospheric, tropospheric and surface impacts from the 11 year ultraviolet solar spectral irradiance (SSI) variability have been extensively studied using climate models and observations. Here, we demonstrate using ...

    • A modeling study of the tripole pattern of East China precipitation over the past 425 ka 

      Dai, Gaowen; Zhang, Zhongshi; Otterå, Odd Helge; Langebroek, Petra; Yan, Qing; Zhang, Ran (Peer reviewed; Journal article, 2021)
      The traditional paleoclimatological view suggests that monsoonal China was overall wetter when the East Asian summer monsoon (EASM) was strong. However, this view is at odds with the understanding of modern climate, which ...

    • A note on the statistical evidence for an influence of geomagnetic activity on Northern Hemisphere seasonal-mean stratospheric temperatures using the Japanese 55-year Reanalysis 

      Tartaglione, Nazario; Toniazzo, Thomas; Orsolini, Yvan; Otterå, Odd Helge (Peer reviewed; Journal article, 2020)
      We employ JRA-55 (Japanese 55-year Reanalysis), a recent second-generation global reanalysis providing data of high quality in the stratosphere, to examine whether a distinguishable effect of geomagnetic activity on Northern ...

    • An oceanic perspective on Greenland’s recent freshwater discharge since 1850 

      Perner, Kerstin; Moros, Matthias; Otterå, Odd Helge; Blanz, Thomas; Schneider, Ralph R.; Jansen, Eystein (Peer reviewed; Journal article, 2019)
      Instrumental data evidence an accelerating freshwater release from Arctic sea ice export and the Greenland Ice Sheet over the past three decades causing cooling and freshening in the subpolar North Atlantic region. However, ...

    • Arctic Troposphere Warming Driven by External Radiative Forcing and Modulated by the Pacific and Atlantic 

      Suo, Lingling; Gao, Yongqi; Gastineau, Guillaume; Liang, Yu-Chiao; Ghosh, Rohit; Tian, Tian; Zhang, Ying; Kwon, Young-Oh; Matei, Daniela; Otterå, Odd Helge; Yang, Shuting (Peer reviewed; Journal article, 2022)
      During the past decades, the Arctic has experienced significant tropospheric warming, with varying decadal warming rates. However, the relative contributions from potential drivers and modulators of the warming are yet to ...

    • Impact of solar irradiance and geomagnetic activity on polar NOx, ozone and temperature in WACCM simulations 

      Tartaglione, Nazario; Toniazzo, Thomas; Orsolini, Yvan J.; Otterå, Odd Helge (Peer reviewed; Journal article, 2020)
      The response of the atmosphere to solar irradiance and geomagnetic activity is analyzed in experiments with the Whole Atmosphere Community Climate Model (WACCM) under idealized forcings. Four experiments are carried out ...

    • Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle 

      Guttu, Sigmund; Orsolini, Yvan; Stordal, Frode; Otterå, Odd Helge; Omrani, Nour-Eddine; Tartaglione, Nazario; Verronen, Pekka T.; Rodger, Craig J.; Clilverd, Mark A. (Peer reviewed; Journal article, 2021)
      Observational studies suggest that part of the North Atlantic Oscillation (NAO) variability may be attributed to the spectral ultra-violet (UV) irradiance variations associated to the 11-year solar cycle. The observed ...

    • Mid-Pliocene Atlantic Meridional Overturning Circulation simulated in PlioMIP2 

      Zhang, Zhongshi; Li, Xiangyu; Guo, Chuncheng; Otterå, Odd Helge; Nisancioglu, Kerim Hestnes; Tan, Ning; Contoux, Camille; Ramstein, Gilles; Feng, Ran; Otto-Bliesner, Bette L.; Brady, Esther C.; Chandan, Deepak; Richard Peltier, Peltier; Baatsen, Michiel L. J.; Von Der Heydt, Anna S.; Weiffenbach, Julia E.; Stepanek, Christian; Lohmann, Gerrit; Zhang, Qiong; Li, Qiang; Chandler, Mark A.; Sohl, Linda E.; Haywood, Alan M.; Hunter, Stephen J.; Tindall, Julia C.; Williams, Charles; Lunt, Daniel J.; Chan, Wing-Le; Abe-Ouchi, Ayako (Peer reviewed; Journal article, 2021)
      In the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2), coupled climate models have been used to simulate an interglacial climate during the mid-Piacenzian warm period (mPWP; 3.264 to 3.025 Ma). Here, we compare ...

    • Simulated contribution of the interdecadal Pacific oscillation to the west Eurasia cooling in 1998-2013 

      Suo, Lingling; Gastineau, Guillaume; Gao, Yongqi; Liang, Yu-Chiao; Ghosh, Rohit; Tian, Tian; Zhang, Ying; Kwon, Young-Oh; Otterå, Odd Helge; Yang, Shuting; Matei, Daniela (Peer reviewed; Journal article, 2022)
      Large ensemble simulations with six atmospheric general circulation models involved are utilized to verify the interdecadal Pacific oscillation (IPO) impacts on the trend of Eurasian winter surface air temperatures (SAT) ...

    • Simulated Cycles of East Asian Temperature and Precipitation Over the Past 425 ka 

      Dai, Gaowen; Zhang, Zhongshi; Otterå, Odd Helge; Langebroek, Petra; Yan, Qing; Zhang, Ran (Peer reviewed; Journal article, 2022)
      Records from a wide range of geological archives covering the last few glacial-interglacial cycles show large inconsistencies in the East Asian summer monsoon variability, which severely hampers our understanding of the ...

    • Warm Advection as a Cause for Extreme Heat Event in North China 

      Wang, Xijin; Zhang, Zhongshi; Yu, Entao; Guo, Chuncheng; Otterå, Odd Helge; Counillon, Francois Stephane (Journal article; Peer reviewed, 2024)
      Extreme heat events (EHEs) often hit North China, resulting in significant losses. The devastating EHE in the 1743 summer, marked as the highest temperature in the past 300 years, led to ∼11,000 fatalities. These historical ...