Yafang Zhong
University of Wisconsin-Madison
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Publication
Featured researches published by Yafang Zhong.
Journal of Climate | 2005
Zhengyu Liu; Steve Vavrus; Feng He; Na Wen; Yafang Zhong
Abstract The response of tropical Pacific SST to increased atmospheric CO2 concentration is reexamined with a new focus on the latitudinal SST gradient. Available evidence, mainly from climate models, suggests that an important tropical SST fingerprint to global warming is an enhanced equatorial warming relative to the subtropics. This enhanced equatorial warming provides a fingerprint of SST response more robust than the traditionally studied El Nino–like response, which is characterized by the zonal SST gradient. Most importantly, the mechanism of the enhanced equatorial warming differs fundamentally from the El Nino–like response; the former is associated with surface latent heat flux, shortwave cloud forcing, and surface ocean mixing, while the latter is associated with equatorial ocean upwelling and wind-upwelling dynamic ocean–atmosphere feedback.
Journal of Climate | 2008
Yafang Zhong; Zhengyu Liu; Robert L. Jacob
Abstract Observations indicate that Pacific multidecadal variability (PMV) is a basinwide phenomenon with robust tropical–extratropical linkage, though its genesis remains the topic of much debate. In this study, the PMV in the Community Climate System Model, version 3 (CCSM3) is investigated with a combined statistical and dynamical approach. In agreement with observations, the modeled North Pacific climate system undergoes coherent multidecadal atmospheric and oceanic variability of a characteristic quasi-50-yr time scale, with apparent connections to the tropical Indo-Pacific. The statistical assessment based on the CCSM3 control integration cannot exclusively identify the origin of the modeled multidecadal linkage, while confirming the two-way interactions between the tropical and extratropical Pacific. Two sensitivity experiments are performed to further investigate the origin of the PMV. With the atmosphere decoupled from the tropical ocean, multidecadal variability in the North Pacific climate rema...
Journal of Climate | 2008
Yafang Zhong; Zhengyu Liu
Abstract Atmospheric response to North Pacific oceanic variability is assessed in Community Climate System Model, version 3 (CCSM3) using two statistical methods and one dynamical method. All methods identify an equivalent barotropic low response to a warmer sea surface temperature (SST) anomaly in the Kuroshio Extension region (KOE) during early–midwinter. While all three methods capture the major features of the response, the generalized equilibrium feedback assessment method (GEFA) isolates the impact of KOE SST from a complex context, and thus makes itself an excellent choice for similar practice.
Journal of Physics: Conference Series | 2008
Yafang Zhong; Zhengyu Liu
Previous analyses of the CCSM3 standard integration have revealed pronounced multidecadal variability in the Pacific climate system. The purpose of the present work is to investigate the physical mechanism underlying the Pacific multidecadal variability (PMV) using specifically designed sensitivity experiments. A novel mechanism is advanced, characterized by a crucial role of the subpolar North Pacific Ocean. The multidecadal signal in ocean temperature and salinity fields is found to originate from the subsurface of the subpolar North Pacific, as result of the wave adjustment to the preceding basin-scale wind curl forcing. The multidecadal signal then ascends to the surface and is amplified through local temperature/salinity convective feedback. Along the southward Oyashio current, the anomaly travels to the Kuroshio Extension (KOE) region and is further intensified through a similar convective feedback in addition to the wind-evaporation-sea surface temperature feedback. The temperature anomaly in the KOE is able to feed back to the large-scale atmospheric circulation, inducing wind curl anomaly over the subpolar region, which in turn generates anomalous oceanic circulation and causes temperature/salinty variability in the subpolar subsurface. Thereby, a closed loop of PMV is established, in the form of a subpolar delayed oscillator.
Geophysical Research Letters | 2012
Gifford H. Miller; Áslaug Geirsdóttir; Yafang Zhong; Darren J. Larsen; Bette L. Otto-Bliesner; Marika M. Holland; David A. Bailey; Kurt A. Refsnider; Scott J. Lehman; John Southon; Chance Anderson; Helgi Björnsson; Thorvaldur Thordarson
Climate Dynamics | 2011
Yafang Zhong; Gifford H. Miller; Bette L. Otto-Bliesner; Marika M. Holland; David A. Bailey; David P. Schneider; Áslaug Geirsdóttir
Geophysical Research Letters | 2013
Gifford H. Miller; Scott J. Lehman; Kurt A. Refsnider; John Southon; Yafang Zhong
Geophysical Research Letters | 2005
Haijun Yang; Qiong Zhang; Yafang Zhong; Steve Vavrus; Zhengyu Liu
Geophysical Research Letters | 2012
Gifford H. Miller; Áslaug Geirsdóttir; Yafang Zhong; Darren J. Larsen; Bette L. Otto-Bliesner; Marika M. Holland; David A. Bailey; Kurt A. Refsnider; Scott J. Lehman; John Southon; Chance Anderson; Helgi Björnsson; Thorvaldur Thordarson
Climate of The Past | 2017
Simon Pendleton; Gifford H. Miller; Robert A. Anderson; Sarah E. Crump; Yafang Zhong; Alexandra Jahn; Áslaug Geirsdóttir