Dr. Jin-Yi Yu Associate Professor Department of Earth System Science School of Physical Sciences University of California, Irvine Ph.D., Atmospheric Science, Univ. of Washington Mailing Address: Department of Earth System Science 3315 Croul Hall University of California at Irvine Irvine, CA 92697-3100 TEL: (949) 824-3878 EMAIL: jyyu@uci.edu

COURSE

ESS 5: The Atmosphere ESS 11: Climate Change and Policy ESS 55: Earth's Atmosphere ESS 101C: Earth System Change ESS 124: Weather and Meteorology ESS 200A: Earth System Climatology ESS 210B: Geoscience Data Analysis ESS 286A (section 42735): Special Topics in Atmosphere-Ocean Interactions

RESEARCH

	A New Global Parallel and Coupled Ocean-Atmosphere GCM A new global, high-resolution, and parallel coupled atmosphere-ocean GCM has been developed under a joint project between UC and Los Alamos National Laboratory. ... [more] View QuickTime or AVI animations of SST in year 8 and 9.
	ENSO Simulation, Dynamics, and Prediction The CGCM Developed by Prof. Yu is one of the models able to produce ENSO-like climate variability with reasonable frequency and amplitude. ...[more] View the simulated ENSO cycle here.
	ENSO-Monsoon Interactions Our investigations focus on how the mutual influences of ENSO and Asian Monsoon are established and how the Indian Ocean might affect these influences. ... [more]
	Indian Ocean Zonal Mode We are able to simulate the Indian Ocean zonal mode (IOZM) in CGCM integrations with and without ENSO events in the Pacific. The generation mechanism of IOZM and its relationship with ENSO are studied. ... [more]
	Pacific Decadal Oscillation (PDO) Pacific Decadal Oscillation (PDO) is believed to contribute to the decadal changes in ENSO activity. We study PDO's generation and modulation mechanisms using CGCM simulations. ... [more]
	Tropical Instability Waves (TIW) Both CGCM simulations and satellite observations are used to study the seasonal and interannual variations of Tropical Instability Waves (TIWs) and their coupling with the atmosphere. ... [more]
	Tropical-Extratropical Interactions Evidence is presented that ENSO in the tropics can force a anomaly SST dipole off the coast of the California through surface heat flux. ... [more]
	Cloud-Radiation Feedback Impacts of high-level clouds and marine boundary layer stratus on tropical atmosphere-ocean system are demonstrated with CGCM experiments. ...[more]
	Jetstream and Stormtrack Vacillation A slow vacillation of jetstram/stormtrack location and strength is shown to be self-maintained by the interactions with the embedded baroclinic waves. ...[more]
	Regional Climate Variations We investigate the roles of oceanic influence, land-surface memory, and internal atmospheric dynamics in forcing interannual variability of North American Monsoon and the associated continental-scale precipitation mode. ...[more]
	Central America Gap Wind and Eastern Pacific Warm Pool The mechanical and thermal impacts of Central America gap winds on the annual cycle of sea surface temperature in the eastern Pacific warm pool are examined with observations and a series of regional ocean model experiments. ...[more]

SELECTED PUBLICATIONS

(2008) Yu, J.-Y., Fengpeng Sun, and Hsun-Ying Kao: Contributions of Indian Ocean and Monsoon Biases to the Excessive Biennial ENSO in CCSM3. Journal of Climate, Submitted. [PDF] (2008) Kao, H.-Y. and J.-Y. Yu: Contrasting Eastern-Pacific and Central-Pacific Types of ENSO. Journal of Climate, In Press. [PDF] (2007) Sun, F. and J.-Y. Yu: A 10-15year Modulation Cycle of ENSO Intensity. Journal of Climate, Submitted. [PDF] (2007) Yu, J.-Y. and Matthew A. Janiga: Changes in the In-Phase Relationship Between the Indian and Subsequent Australian Summer Monsoons During the Past Five Decades. Annales Geophysicae, 25, 1929-1933. [PDF] (2007) Yu, J.-Y. : Understanding El Nino Southern Oscillation and its interactions with the Indian Ocean and monsoon. Book chapter in Recent Progress in Atmospheric Sciences with Applications to the Asia-Pacific Region, In Press. [PDF] (2007) Yu, J.-Y. and H.-Y. Kao: Decadal Changes of ENSO Persistence Barrier in SST and Ocean Heat Content Indices: 1958-2001. Jounal of Geophysical Research, 112, D13106, doi:10.1029/2006JD007654. [PDF] (2006) Sun, F. and J.-Y. Yu: Impacts of Central America gap winds on the SST annual cycle in the eastern Pacific warm pool. Geophysical Research Letters, 33, L06710, doi:10.1029/2005GL024700. [PDF] (2005) Yu, J.-Y. : Enhancement of ENSO's persistence barrier by biennial variability in a coupled atmosphere-ocean general circulation model. Geophysical Research Letters, 32, L13707, doi:10.1029/2005GL023406. [PDF] (2004) Yu, J.-Y. and K. M. Lau: Contrasting Indian Ocean SST variability with and without ENSO influence: A coupled atmosphere-ocean GCM study. Meteorology and Atmospheric Physics, DOI: 10.1007/s00703-004-0094-7. [PDF] (2003) Yu, J.-Y. and W. T. Liu: A linear relationship between ENSO intensity and tropical instability wave activity in the eastern Pacific Ocean. Geophysical Research Letters, 30(14), 1735, doi:10.1029/2003GL017176. [PDF] (2003) Yu, J.-Y., S.-P. Weng, and J. D. Farrara: Ocean Roles in the TBO Transitions of the Indian-Australian Monsoon System. Journal of Climate, 16, 3072-3080. [PDF] (2003) Yu, J.-Y.: Identifications and applications of coupled climate models. Invited article in The Encyclopedia of Life Support Systems, Ed. Achim Sydow, EOLSS Publisher, Oxford, UK, 15pp. [PDF] (2003) Farrara, J. D. and J.-Y. Yu: Interannual variations in the North American monsoon and SST anomalies: A general circulation model study. Journal of Climate, 16, 1703-1720. [PDF] (2003) C. R. Mechoso, J. D. Neelin, and J.-Y. Yu: Testing simple model of ENSO, Journal of Atmospheric Sciences, 60, 305-318. [PDF] (2002) Yu, J.-Y. , C. R. Mechoso, J. C. McWilliams, and A. Arakawa: Impacts of the Indian Ocean on the ENSO cycle. Geophysical Research Letters, 29(8), 1204, doi:10.1029/2001GL014098. [PDF] (2002) Davey, M. K., M. Huddleston, K.R. Sperber, S.B. Power, R.A. Colman, G. Flato, M. Kimoto, L. Terray, D. DeWitt, E. Roeckner, J. Oberhuber, R. Voss, U. Cubasch, T.R. Knutson, S. Manabe, B. Wang, L. Fairhead, H. Le Treut, A. Vintzileos, P. Delecluse, P. Braconnot, I. Yoshikawa, D. Chen, S.E. Zebiak, C. Gordon, C. Cooper, M. Latif, S. Yukimoto, A. Kitoh, F. Bryan, G.A. Meehl, W.M. Washington, M. Ji, T. Hogan, T. Li, J.-Y. Yu, C. R. Mechoso: STOIC: A study of coupled GCM climatology and variability in tropical ocean regions. Climate Dynamics, 18, 403-420. (2001) Yu, J.-Y. and C.R. Mechoso: A coupled atmosphere-ocean GCM study of the ENSO cycle. Journal of Climate, 14, 2329-2350. [PDF] (2001) Latif, M. K. Sperber, A. Arblaster, P. Braccanot, D. Chen, A. Colman, U. Cubasch, M. Davey, P. Delecleuse, D. De Witt, L. Fairhead, G. Flato, M. Ji, M. Kimoto, A. Kitoh, T. Knutson, H. Le Treut, S. Manabe, O. Marti, C. Mechoso, G. Meehl, J. Oberhuber, S. Power, E. Roeckner, L. Terray, A. Vintzileos, R. Vob, B. Wang, W. Washington, I. Yoshikawa, J.-Y. Yu, S. Zebiak: ENSIP: The El Nino Simulation Intercomparison Project. Climate Dynamics, 18, 255-276. (2001) Yu, J.-Y. and R. C. Malone: A Global High-Resolution UCLA-POP Coupled Atmosphere-Ocean GCM for Assessing Climate and Variability in the Ocean. Proceedings of the Symposium on Climate Variability, the Ocean, and Social Impacts, 14-18 January 2001, Albuquerque, New Mexico, 160-162. (2000) Yu, J.-Y., W. T. Liu, and C.R. Mechoso: The SST anomaly dipole in the Northern Subtropical Pacific and its relationship with ENSO. Geophysical Research Letters, 27, 1931-1934. [PDF] (2000) Yu, J.-Y.: A general circulation model of the atmosphere using the full-Galerkin method. Journal of Mathematics and Computers in Simulation, 52, 427-443. [PDF] (2000) Mechoso, C. R., J.-Y. Yu, and A. Arakawa: A coupled GCM pilgrimage: From climate catastrophe to ENSO simulations. Book Chapter in General Circulation Model Development: Past, Present, and Future., D. A. Randall, Eds., Academic Press, 539-575. (2000) Mechoso, C. R., J. D. Farrara, L.A. Drummond, J. Spahr and J.-Y. Yu: An atmosphere-ocean model: Code optimization and application to El Nino. Book Chapter in Development and Application of Computer Techniques to Environmental Studies VIII., D. A. Gabriel Ibarra-Berastegi, C. A. Brebbia and P. Zanetti, Eds, WIT Press, Southampton, Boston, 261-278. (1999) Yu, J.-Y., and C.R. Mechoso: Links between annual variations of Peruvian stratocumulus clouds and of SSTs in the eastern equatorial Pacific. Journal of Climate, 12, 3305-3318. [PDF] (1999) Yu, J.-Y., and C.R. Mechoso: A discussion on the errors in the surface heat fluxes simulated by a coupled GCM. Journal of Climate, 12, 416-426. [PDF]