Atmospheric responses to oceanic eddies in the Kuroshio Extension region

We examined atmospheric responses to 35,000+ oceanic eddies in the Kuroshio Extension region during the period of 2006–2009. Using satellite data, we showed that cold (warm) eddies cause surface winds to decelerate (accelerate) and reduce (increase) latent and sensible heat fluxes, cloud liquid water, water vapor content, and rain rate; all of these changes are quantified. Both the linear correlation between wind divergence and downwind sea surface temperature (SST) gradient and the correspondence between vorticity and crosswind SST gradient support the vertical momentum mixing mechanism, which indicates that SST perturbations modify surface winds by changing the vertical turbulent mixing in the marine atmospheric boundary layer (MABL). High-resolution National Centers for Environmental Prediction Climate Forecast System Reanalysis (CFSR) data can reproduce the atmospheric responses to the oceanic eddies in the MABL albeit with some differences in intensity. In addition, the CFSR data reveal that the atmospheric responses to these oceanic eddies are not confined in the MABL. MABL deepens (shoals) over the warm (cold) eddies; enhanced (reduced) vertical transport of transient zonal momentum occurs over the warm (cold) eddies from the sea surface to about 850 hPa level; vertical velocity anomalies over oceanic eddies penetrate beyond the MABL into free atmosphere; there exists a positive correlated relationship between SST and convective rain rate anomalies, indicative of ocean eddies' impact on the free troposphere. However, the composites of cloud liquid water and rain rate are different from the results based on the satellite data.

[1]  Yu Liu,et al.  An Automated Approach to Detect Oceanic Eddies From Satellite Remotely Sensed Sea Surface Temperature Data , 2011, IEEE Geoscience and Remote Sensing Letters.

[2]  T. Hara,et al.  Surface wind response to oceanic fronts , 2006 .

[3]  Hisashi Nakamura,et al.  Influences of the Kuroshio/Oyashio Extensions on Air-Sea Heat Exchanges and Storm-Track Activity as Revealed in Regional Atmospheric Model Simulations for the 2003/04 Cold Season* , 2009 .

[4]  W. Liu,et al.  Local and remote atmospheric response to tropical instability waves: A global view from space , 2001 .

[5]  Dudley B. Chelton,et al.  An Assessment of the Sea Surface Temperature Influence on Surface Wind Stress in Numerical Weather Prediction and Climate Models , 2006 .

[6]  Reto Knutti,et al.  Imprint of Southern Ocean eddies on winds, clouds and rainfall , 2013 .

[7]  Youichi Tanimoto,et al.  SST-Induced Surface Wind Variations over the Brazil-Malvinas Confluence : Satellite and In Situ Observations , 2005 .

[8]  Frank J. Wentz,et al.  High-Resolution Satellite Measurements of the Atmospheric Boundary Layer Response to SST Variations along the Agulhas Return Current , 2005 .

[9]  Xiaosu Xie,et al.  Atmospheric manifestation of tropical instability wave observed by QuikSCAT and tropical rain measuring mission , 2000 .

[10]  Y. Kuo,et al.  Climatology of explosive cyclones off the East Asian Coast , 1992 .

[11]  D. Chelton,et al.  Satellite Measurements Reveal Persistent Small-Scale Features in Ocean Winds , 2004, Science.

[12]  W. Timothy Liu,et al.  Bathymetric effect on the winter sea surface temperature and climate of the Yellow and East China Seas , 2002 .

[13]  Yuqing Wang,et al.  Numerical Simulation of Atmospheric Response to Pacific Tropical Instability Waves , 2003 .

[14]  Y. Kuo,et al.  Synoptic Climatology of Cyclogenesis over East Asia, 1958-1987 , 1991 .

[15]  S. Minobe,et al.  Response of Storm Tracks to Bimodal Kuroshio Path States South of Japan , 2012 .

[16]  J. Wallace,et al.  Spatial Patterns of Atmosphere-Ocean Interaction in the Northern Winter. , 1990 .

[17]  Tommy D. Dickey,et al.  A Vector Geometry–Based Eddy Detection Algorithm and Its Application to a High-Resolution Numerical Model Product and High-Frequency Radar Surface Velocities in the Southern California Bight , 2010 .

[18]  Hisashi Nakamura,et al.  Separation of Climatological Imprints of the Kuroshio Extension and Oyashio Fronts on the Wintertime Atmospheric Boundary Layer: Their Sensitivity to SST Resolution Prescribed for Atmospheric Reanalysis , 2015 .

[19]  Shoshiro Minobe,et al.  Atmospheric Response to the Gulf Stream: Seasonal Variations* , 2010 .

[20]  D. Chelton,et al.  Observations of SST-Induced Perturbations of the Wind Stress Field over the Southern Ocean on Seasonal Timescales , 2003 .

[21]  Thomas M. Smith,et al.  Daily High-Resolution-Blended Analyses for Sea Surface Temperature , 2007 .

[22]  Smith,et al.  Satellite measurements of sea surface temperature through clouds , 2000, Science.

[23]  Mathieu Rouault,et al.  Underestimation of Latent and Sensible Heat Fluxes above the Agulhas Current in NCEP and ECMWF Analyses , 2003 .

[24]  Peter Cornillon,et al.  Air–sea interaction over ocean fronts and eddies , 2008 .

[25]  Hiroshi Ichikawa,et al.  Ocean Frontal Effects on the Vertical Development of Clouds over the Western North Pacific: In Situ and Satellite Observations* , 2009 .

[26]  Yuping Guan,et al.  Eddy analysis in the subtropical zonal band of the North Pacific Ocean , 2012 .

[27]  Arun Kumar,et al.  Ocean–Atmosphere Characteristics of Tropical Instability Waves Simulated in the NCEP Climate Forecast System Reanalysis , 2012 .

[28]  Masami Nonaka,et al.  Covariations of Sea Surface Temperature and Wind over the Kuroshio and Its Extension: Evidence for Ocean-to-Atmosphere Feedback(. , 2003 .

[29]  R. Fett,et al.  Air-Sea Interaction Effects in the Lower Troposphere Across the North Wall of the Gulf Stream , 1981 .

[30]  Shoshiro Minobe,et al.  Influence of the Gulf Stream on the troposphere , 2008, Nature.

[31]  Frank O. Bryan,et al.  Storm track response to ocean fronts in a global high-resolution climate model , 2014, Climate Dynamics.

[32]  Robert A. Weller,et al.  Objectively Analyzed Air–Sea Heat Fluxes for the Global Ice-Free Oceans (1981–2005) , 2007 .

[33]  Dudley B. Chelton,et al.  The Effects of SST-Induced Surface Wind Speed and Direction Gradients on Midlatitude Surface Vorticity and Divergence , 2010 .

[34]  Peter Cornillon,et al.  Modification of surface winds near ocean fronts: Effects of Gulf Stream rings on scatterometer (QuikSCAT, NSCAT) wind observations , 2006 .

[35]  Bo Qiu,et al.  Interannual Variability of the North Pacific Subtropical Countercurrent and Its Associated Mesoscale Eddy Field , 2010 .

[36]  Frank O. Bryan,et al.  Frontal scale air-sea interaction in high-resolution coupled climate models , 2010 .

[37]  D. Chelton,et al.  Modeling the Atmospheric Boundary Layer Wind Response to Mesoscale Sea Surface Temperature Perturbations , 2014 .

[38]  W. Timothy Liu,et al.  Direct Observations of Atmospheric Boundary Layer Response to SST Variations Associated with Tropical Instability Waves over the Eastern Equatorial Pacific , 2002 .

[39]  R. Lindzen,et al.  On the role of sea surface temperature gradients in forcing low-level winds and convergence in the tropics , 1987 .

[40]  John M. Wallace,et al.  The Influence of Sea-Surface Temperature on Surface Wind in the Eastern Equatorial Pacific: Seasonal and Interannual Variability , 1989 .

[41]  Shang-Ping Xie,et al.  Satellite Observations of Cool Ocean–Atmosphere Interaction , 2004 .

[42]  G. Lapeyre,et al.  Atmospheric response to sea surface temperature mesoscale structures , 2013 .

[43]  W. Timothy Liu,et al.  Ocean–Atmosphere Interaction over Agulhas Extension Meanders , 2007 .

[44]  C. O’Reilly,et al.  The response of the Pacific storm track and atmospheric circulation to Kuroshio Extension variability , 2015 .

[45]  Yuqing Wang,et al.  Deep Atmospheric Response to the Spring Kuroshio over the East China Sea , 2011 .

[46]  Uang,et al.  The NCEP Climate Forecast System Reanalysis , 2010 .

[47]  Daniele Iudicone,et al.  Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology , 2004 .

[48]  Y. Asuma,et al.  Structures and Environment of Explosively Developing Extratropical Cyclones in the Northwestern Pacific Region , 2004 .

[49]  Akio Arakawa,et al.  The parameterization of the planetary boundary layer in the UCLA general circulation model - Formulation and results , 1983 .

[50]  B. Taguchi,et al.  Atmospheric sounding over the winter Kuroshio Extension: Effect of surface stability on atmospheric boundary layer structure , 2006 .

[51]  Larry W. O'Neill,et al.  Satellite Observations of Mesoscale Eddy-Induced Ekman Pumping , 2015 .

[52]  J. Namias,et al.  Large-Scale Air-Sea Interactions and Short-Period Climatic Fluctuatioins , 1981, Science.

[53]  Dudley B. Chelton,et al.  Summertime Coupling between Sea Surface Temperature and Wind Stress in the California Current System , 2007 .