Search Results

You are looking at 1 - 10 of 16 items for :

  • Southern Ocean x
  • U.S. CLIVAR - Hurricanes and Climate x
  • All content x
Clear All
Hiroyuki Murakami, Pang-Chi Hsu, Osamu Arakawa, and Tim Li

term to total future change (i.e., |RBTC| ≤ 0.25 and ≤0.5, respectively). The projected reductions are also substantial and robust in the Southern Hemispheric ocean basins (SIO and SPO), a result that is consistent with the findings of previous studies (e.g., Knutson et al. 2010 ; Murakami et al. 2012b ). Most of the MRI-AGCMs under the A1B scenario project marked reductions in TC genesis frequency and FOCs in the WNP and ENP; however, the fractional ratios vary substantially among the models (by

Full access
Gabriele Villarini, David A. Lavers, Enrico Scoccimarro, Ming Zhao, Michael F. Wehner, Gabriel A. Vecchi, Thomas R. Knutson, and Kevin A. Reed

the main points of this study. 2. Data and methods Six TC genesis basins were used in this analysis, four in the Northern Hemisphere [North Atlantic (NA), eastern North Pacific (EP), western North Pacific (WP), and north Indian (NI) Ocean] and two in the Southern Hemisphere [south Indian (SI) Ocean and southern Pacific (SP)]. The delineation of these basins is the same as the one used in Camargo et al. (2005) , with the only exception that we combine their Australian and South Pacific basins into

Full access
Hamish A. Ramsay, Savin S. Chand, and Suzana J. Camargo

; Emanuel et al. 2004 ), a relatively simple axisymmetric tropical cyclone model coupled to a slab ocean model. The collective movement and intensity of each synthetic storm is determined entirely by the large-scale environment of the host model, by design. The initial seeding rate is independent of the ambient wind field; however, any storm embedded in strong vertical wind shear will quickly dissipate. The synthetic track technique has been shown to produce a reasonable climatology of Southern

Full access
Wei Mei, Shang-Ping Xie, and Ming Zhao

1976 ; Holland 1983 ). They are identified to exhibit strong intrabasin variabilities in the NA and much of them can be connected to various climate modes, such as the El Niño–Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO) ( Elsner et al. 2000 ; Elsner 2003 ; Kossin et al. 2010 ). The large-scale factors affecting TC genesis and tracks are not necessarily the same, although TCs generated in different regions have, on average, different flavors for their paths (straight

Full access
Suzana J. Camargo, Michael K. Tippett, Adam H. Sobel, Gabriel A. Vecchi, and Ming Zhao

necessary [or additional downscaling could be used (e.g., Bender et al. 2010 )]. Fig . 2. Mean NTC per month for the HiRAM climatological simulation and observations (1981–2005) in the (a) Southern Hemisphere, (b) Northern Hemisphere, (c) south Indian Ocean, (d) Australian region, (e) western North Pacific, and (f) North Atlantic. Table 2. Domain definitions used for basin integrations. All Southern (Northern) Hemisphere basins are defined in oceanic regions from the equator to 40°S (40°N). In summary

Full access
Malcolm J. Roberts, Pier Luigi Vidale, Matthew S. Mizielinski, Marie-Estelle Demory, Reinhard Schiemann, Jane Strachan, Kevin Hodges, Ray Bell, and Joanne Camp

system where the atmosphere–land–ocean–ice system can reach its own equilibrium and be in surface energy balance). This would require many more ensemble members because of the increased internal variability of such a system ( Deser et al. 2012 ), which increases the difficulty in separating signal from noise. Such experiments would likely be at least an order of magnitude more computationally expensive and are strongly affected by biases in all model components being small enough for the mean

Full access
Christina M. Patricola, R. Saravanan, and Ping Chang

; Servain et al. 1999 ), which characterizes interannual to decadal variations in the cross-equatorial gradient between Northern and Southern Hemisphere tropical Atlantic SST. Both the AMO and AMM encompass the Atlantic main development region; in addition, the AMO includes the remote subtropical and midlatitude North Atlantic, while the AMM includes the remote southern tropical Atlantic. The AMM is a coupled ocean–atmosphere mode that can be generated by external forcings such as ENSO and the North

Full access
Wei Mei, Shang-Ping Xie, Ming Zhao, and Yuqing Wang

meaningful mode ( Fig. 8a ). This mode suggests that the TC activity over the open ocean varies in phase except over the southern SCS and along the south and east coasts of China where the phase is opposite. This differs from the classic pattern of anomalous TC activity induced by the conventional EP ENSO that is characterized by an oscillation between the southeastern and northwestern quadrants of the WNP. This difference may be reconciled by the EOF analysis of HiRAM simulations that reveals two

Full access
John G. Dwyer, Suzana J. Camargo, Adam H. Sobel, Michela Biasutti, Kerry A. Emanuel, Gabriel A. Vecchi, Ming Zhao, and Michael K. Tippett

central North Pacific is a relatively inactive basin, with no months averaging more than one tropical storm per month. The north Indian Ocean has a semiannual cycle with peaks in May and between October and December, with a quiescent period in between during monsoon season. In the Southern Hemisphere, the South Pacific, Australian basin, and south Indian Ocean have a similar climatology, with the highest frequency of TCs between January and March. Fig . 2. Seasonal cycles of the number of TCs in

Full access
Enrico Scoccimarro, Silvio Gualdi, Gabriele Villarini, Gabriel A. Vecchi, Ming Zhao, Kevin Walsh, and Antonio Navarra

double-intertropical convergence zone problem and cloud biases over the Southern Ocean . Proc. Natl. Acad. Sci. USA , 110, 4935–4940, doi: 10.1073/pnas.1213302110 . Jiang , H. , and E. J. Zipser , 2010 : Contribution of tropical cyclones to the global precipitation from eight seasons of TRMM data: Regional, seasonal, and interannual variations . J. Climate , 23 , 1526 – 1543 , doi: 10.1175/2009JCLI3303.1 . Knutson , T. R. , and S. Manabe , 1995 : Time-mean response over the

Full access