Detection of external influence on trends of atmospheric storminess and northern oceans wave heights

The atmospheric storminess as inferred from geostrophic wind energy and ocean wave heights have increased in boreal winter over the past half century in the high-latitudes of the northern hemisphere (especially the northeast North Atlantic), and have decreased in more southerly northern latitudes. This study shows that these trend patterns contain a detectable response to anthropogenic and natural forcing combined. The effect of external influence is found to be strongest in the winter hemisphere, that is, in the northern hemisphere in January–March and in the southern hemisphere in July–September. However, the simulated response to anthropogenic and natural forcing combined, which was obtained directly from climate models in the case of geostrophic wind energy and indirectly via an empirical downscaling procedure in the case of ocean wave heights, is significantly weaker than the magnitude of the observed changes in these parameters.

[1]  Peter A. Stott,et al.  Attribution of regional‐scale temperature changes to anthropogenic and natural causes , 2003 .

[2]  Nathan P. Gillett,et al.  Detection of external influence on sea level pressure with a multi‐model ensemble , 2005 .

[3]  B. Hoskins,et al.  New perspectives on the Northern Hemisphere winter storm tracks , 2002 .

[4]  P. Stott,et al.  Causes of atmospheric temperature change 1960–2000: A combined attribution analysis , 2003 .

[5]  W. Collins,et al.  Global climate projections , 2007 .

[6]  G. Hegerl,et al.  Detection of human influence on twentieth-century precipitation trends , 2007, Nature.

[7]  Francis W. Zwiers,et al.  Detecting and attributing external influences on the climate system: a review of recent advances , 2005 .

[8]  B. Santer,et al.  Penetration of Human-Induced Warming into the World's Oceans , 2005, Science.

[9]  H. Tuomenvirta,et al.  Long-term variations of the storm climate over NW Europe , 1998 .

[10]  Xiaolan L. Wang,et al.  Changes of Extreme Wave Heights in Northern Hemisphere Oceans and Related Atmospheric Circulation Regimes , 2001 .

[11]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[12]  H. L. Miller,et al.  Climate Change 2007: The Physical Science Basis , 2007 .

[13]  A. Sterl,et al.  The ERA‐40 re‐analysis , 2005 .

[14]  Val R. Swail,et al.  Trends of Atlantic Wave Extremes as Simulated in a 40-Yr Wave Hindcast Using Kinematically Reanalyzed Wind Fields , 2002 .

[15]  S. Bacon,et al.  Wave climate changes in the North Atlantic and North Sea , 2007 .

[16]  R. Allan,et al.  A new globally complete monthly historical gridded mean sea level pressure dataset (HadSLP2): 1850-2004 , 2006 .

[17]  P. Coles,et al.  Flying raft caught on red tape , 1989, Nature.

[18]  W. Collins,et al.  The NCEP–NCAR 50-Year Reanalysis: Monthly Means CD-ROM and Documentation , 2001 .

[19]  Francis W. Zwiers,et al.  Multimodel Multisignal Climate Change Detection at Regional Scale , 2006 .

[20]  A. Sterl,et al.  Intercomparison of Different Wind–Wave Reanalyses , 2004 .

[21]  Francis W. Zwiers,et al.  Detection of human influence on sea-level pressure , 2003, Nature.

[22]  Andrew T. Cox,et al.  A global wave hindcast over the period 1958–1997: Validation and climate assessment , 2001 .

[23]  V. R. Swail,et al.  Historical And Possible Future Changes OfWave Heights In Northern Hemisphere Oceans , 2006 .

[24]  Sverre Petterssen,et al.  Weather analysis and forecasting , 1940 .

[25]  K. Hasselmann.  Optimal Fingerprints for the Detection of Time-dependent Climate Change , 1993 .

[26]  F. Zwiers,et al.  Toward Regional-Scale Climate Change Detection , 2003 .

[27]  R. Voss,et al.  Multi-fingerprint detection and attribution analysis of greenhouse gas, greenhouse gas-plus-aerosol and solar forced climate change , 1997 .

[28]  M. Blackmon,et al.  A Climatological Spectral Study of the 500 mb Geopotential Height of the Northern Hemisphere. , 1976 .

[29]  Xiaolan L. Wang,et al.  Climate change signal and uncertainty in projections of ocean wave heights , 2006 .

[30]  P. Stott,et al.  Estimating signal amplitudes in optimal fingerprinting, part I: theory , 2003 .

[31]  R. Sausen,et al.  Contributions of Anthropogenic and Natural Forcing to Recent Tropopause Height Changes , 2003, Science.

[32]  G. Hegerl,et al.  Understanding and Attributing Climate Change , 2007 .

[33]  H. Tuomenvirta,et al.  Trends of storms in NW Europe derived from an updated pressure data set , 2000 .

[34]  L. H. Horn,et al.  Northern Hemisphere extratropical cyclone activity for four mid‐season months , 1984 .

[35]  S. Gulev,et al.  Extratropical cyclone variability in the Northern Hemisphere winter from the NCEP/NCAR reanalysis data , 2001 .

[36]  W. Menke,et al.  Focused magma supply at the intersection of the Cobb hotspot and the Juan de Fuca ridge , 2003 .

[37]  R. Reynolds,et al.  The NCEP/NCAR 40-Year Reanalysis Project , 1996, Renewable Energy.

[38]  John F. B. Mitchell,et al.  Causes of twentieth-century temperature change near the Earth's surface , 1999, Nature.

[39]  H. Storch,et al.  European storminess: late nineteenth century to present , 2008 .

[40]  F. Zwiers,et al.  Climatology and Changes of Extratropical Cyclone Activity: Comparison of ERA-40 with NCEP NCAR Reanalysis for 1958 2001 , 2006 .