Blar i Geophysical Institute på tidsskrift "Climate Dynamics"

Viser treff 1-20 av 25

    • The 2021 Atlantic Niño and Benguela Niño Events: external forcings and air–sea interactions 

      Illig, Serena; Bacherely, Marie-Lou (Journal article; Peer reviewed, 2023)
      This paper presents a comprehensive analysis of the extreme Atlantic and Benguela Niño events that occurred during the boreal spring–summer of 2021. We conducted sensitivity experiments with a regional ocean–atmosphere ...

    • Assessing the influence of sea surface temperature and arctic sea ice cover on the uncertainty in the boreal winter future climate projections 

      Cheung, Ho-Nam; Keenlyside, Noel Sebastian; Koenigk, Torben; Yang, Shuting; Tian, Tian; Xu, Zhiqing; Gao, Yongqi; Ogawa, Fumiaki; Omrani, Nour-Eddine; Qiao, Shaobo; Zhou, Wen (Journal article; Peer reviewed, 2022)
      We investigate the uncertainty (i.e., inter-model spread) in future projections of the boreal winter climate, based on the forced response of ten models from the CMIP5 following the RCP8.5 scenario. The uncertainty in the ...

    • Causes of the large warm bias in the Angola–Benguela Frontal Zone in the Norwegian Earth System Model 

      Koseki, Shunya; Keenlyside, Noel; Demissie, Teferi Dejene; Toniazzo, Thomas; Counillon, Francois; Bethke, Ingo; Ilicak, Mehmet; Shen, Mao-Lin (Journal article; Peer reviewed, 2018)
      We have investigated the causes of the sea surface temperature (SST) bias in the Angola–Benguela Frontal Zone (ABFZ) of the southeastern Atlantic Ocean simulated by the Norwegian Earth System Model (NorESM). Similar to ...

    • Contributors to linkage between Arctic warming and East Asian winter climate 

      Xu, Xinping; He, Shengping; Gao, Yongqi; Zhou, Botao; Wang, Huijun (Journal article; Peer reviewed, 2021)
      Previous modelling and observational studies have shown discrepancies in the interannual relationship of winter surface air temperature (SAT) between Arctic and East Asia, stimulating the debate about whether Arctic change ...

    • The El Niño effect on Ethiopian summer rainfall 

      Gleixner, Stephanie Nikola; Keenlyside, Noel; Viste, Ellen; Korecha, Diriba (Journal article; Peer reviewed, 2017)
      While El Niño is known to cause failure of Kiremt (boreal summer) rainfall in Ethiopia, the mechanisms are not fully understood. Here we use the ECHAM5 Atmospheric General Circulation Model to investigate the physical link ...

    • ENSO teleconnections in terms of non-NAO and NAO atmospheric variability 

      King, Martin Peter; Keenlyside, Noel Sebastian; Li, Camille (Journal article; Peer reviewed, 2023)
      The validity of the long-held understanding or assumption that El Niño-Southern Oscillation (ENSO) has a remote influence on the North Atlantic Oscillation (NAO) in the January–February–March (JFM) months has been questioned ...

    • Impact of Arctic sea ice variations on winter temperature anomalies in northern hemispheric land areas 

      Köenigk, Torben; Gao, Yongqi; Gastineau, Guillaume; Keenlyside, Noel; Nakamura, Tetsu; Ogawa, Fumiaki; Orsolini, Yvan; Semenov, Vladimir A.; Suo, Lingling; Tian, Tian; Wang, Tao; Wettstein, Justin; Yang, Shuting (Peer reviewed; Journal article, 2018-07-30)
      Coordinated numerical ensemble experiments with six different state-of-the-art atmosphere models have been used in order to evaluate the respective impact of the observed Arctic sea ice and sea surface temperature (SST) ...

    • Impact of initialization methods on the predictive skill in NorCPM: an Arctic–Atlantic case study 

      Passos, Leilane G.; Langehaug, Helene R.; Årthun, Marius; Eldevik, Tor; Bethke, Ingo; Kimmritz, Madlen (Journal article; Peer reviewed, 2022)
      The skilful prediction of climatic conditions on a forecast horizon of months to decades into the future remains a main scientific challenge of large societal benefit. Here we assess the hindcast skill of the Norwegian ...

    • Impact of late spring Siberian snow on summer rainfall in South-Central China 

      Shen, Haibo; Li, Fei; He, Shengping; Orsolini, Yvan; Li, Jingyi (Journal article; Peer reviewed, 2020)
      Located in the Yangtze River Valley and surrounded by mountains, South-Central China (SCC) frequently suffered from natural disasters such as torrential precipitation, landslide and debris flow. Here we provide corroborative ...

    • Impact of sea ice transport on Beaufort Gyre liquid freshwater content 

      Cornish, Sam B.; Muilwijk, Morven; Scott, Jeffery R.; Marson, Juliana M.; Myers, Paul G.; Zhang, Wenhao; Wang, Qiang; Kostov, Yavor; Johnson, Helen L.; Marshall, John (Journal article; Peer reviewed, 2023)
      The Arctic Ocean’s Beaufort Gyre (BG) is a wind-driven reservoir of relatively fresh seawater, situated beneath time-mean anticyclonic atmospheric circulation, and is covered by mobile pack ice for most of the year. Liquid ...

    • Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation 

      Medhaug, Iselin; Langehaug, Helene Reinertsen; Eldevik, Tor; Furevik, Tore; Bentsen, Mats (Peer reviewed; Journal article, 2011-06-25)
      Variability in the Atlantic Meridional Overturning Circulation (AMOC) has been analysed using a 600-year pre-industrial control simulation with the Bergen Climate Model. The typical AMOC variability has amplitudes of 1 ...

    • Ocean–atmosphere coupled Pacific Decadal variability simulated by a climate model 

      Luo, Hao; Zheng, Fei; Keenlyside, Noel; Zhu, Jiang (Journal article; Peer reviewed, 2020)
      Currently, the mechanisms for Pacific Decadal Oscillation (PDO) are still disputed, and in particular the atmosphere response to the ocean in the mid-latitude remains a key uncertainty. In this study, we investigate two ...

    • Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations 

      Seidenglanz, Anne; Athanasiadis, Panos J.; Ruggieri, Paolo; Cvijanovic, Ivana; Li, Camille; Gualdi, Silvio (Journal article; Peer reviewed, 2021)
      Recent studies point to the sensitivity of mid-latitude winter climate to Arctic sea ice variability. However, there remain contradictory results in terms of character and timing of Northern Hemisphere large-scale circulation ...

    • Pacific contribution to decadal surface temperature trends in the Arctic during the twentieth century 

      Svendsen, Lea; Keenlyside, Noel; Muilwijk, Morven; Bethke, Ingo; Omrani, Nour-Eddine; Gao, Yongqi (Journal article; Peer reviewed, 2021)
      Instrumental records suggest multidecadal variability in Arctic surface temperature throughout the twentieth century. This variability is caused by a combination of external forcing and internal variability, but their ...

    • Physical processes of summer extreme rainfall interannual variability in eastern China: Part I—observational analysis 

      Tian, Fangxing; Li, Sihan; Dong, Buwen; Klingaman, Nicholas P.; Freychet, Nicolas; Sparrow, Sarah (Journal article; Peer reviewed, 2022)
      Extreme precipitation can have catastrophic effects in China by triggering floods, landslides, and other natural disasters. We measure extreme precipitation over eastern China by the maximum of five-day precipitation amount ...

    • Recent weakening in the winter ENSO teleconnection over the North Atlantic‑European region 

      Ivasic, Sara; Herceg-Bulic, Ivana; King, Martin Peter (Journal article; Peer reviewed, 2021)
      New observational evidence for variability of the atmospheric response to wintertime El Niño-Southern Oscillation (ENSO) is found. Using different approaches and datasets, a weakening in the recent ENSO teleconnection over ...

    • Relating model bias and prediction skill in the equatorial Atlantic 

      Counillon, Francois; Keenlyside, Noel; Toniazzo, Thomas; Koseki, Shunya; Demissie, Teferi Dejene; Bethke, Ingo; Wang, Yiguo (Journal article; Peer reviewed, 2021)
      We investigate the impact of large climatological biases in the tropical Atlantic on reanalysis and seasonal prediction performance using the Norwegian Climate Prediction Model (NorCPM) in a standard and an anomaly coupled ...

    • The role of air–sea coupling on November–April intraseasonal rainfall variability over the South Pacific 

      Pariyar, Sunil Kumar; Keenlyside, Noel Sebastian; Tseng, Wan-Ling; Hsu, Huang-Hsiung; Tsuang, Ben-Jei (Journal article; Peer reviewed, 2022)
      We investigate the impact of resolving air-sea interaction on the simulation of the intraseasonal rainfall variability over the South Pacific using the ECHAM5 atmospheric general circulation model coupled with the ...

    • The role of the sea surface temperature in the atmospheric seasonal cycle of the equatorial Atlantic 

      Rodriguez Crespo, Lander; Keenlyside, Noel; Koseki, Shunya (Journal article; Peer reviewed, 2018)
      We investigate the role of sea surface temperature (SST) and land surface temperature (LST) in driving the seasonal cycle of the atmosphere (surface winds and precipitation) in the tropical Atlantic. For this we compare ...

    • Role of wind stress in driving SST biases in the tropical Atlantic 

      Voldoire, Aurore; Exarchou, Eleftheria; Sánchez-Gómez, Emilia; Demissie, Teferi Dejene; Deppenmeier, Anna-Lena; Frauen, Claudia; Goubanova, Katarina; Hazeleger, Wilco; Keenlyside, Noel; Koseki, Shunya; Prodhomme, Chloé; Shonk, Jonathan; Toniazzo, Thomas; Traoré, Abdoul-Khadre (Journal article; Peer reviewed, 2019-03-13)
      Coupled climate models used for long-term future climate projections and seasonal or decadal predictions share a systematic and persistent warm sea surface temperature (SST) bias in the tropical Atlantic. This study attempts ...