Ian Simmonds

The geography and latitude of the Antarctic Peninsula (AP) differ signi???cantly from those of most of Antarctica, and hence it is not surprising that its weather and climate exhibit special characteristics. We present here modern aspects of the cli-mate of the AP derived from a ...

... Insert chart highlights the performance for each environmental point sample test for the 500hPa level (2001 Australian Duck case study ... gov.au/events/9icshmo/ last checked in June 2010 [13] Berrisford P, Dee D, Fielding K, Fuentes M, Kallberg P, Kobayshi S and Uppala S 2009 ...

Abstract To assess the impact on the global atmospheric circulation of zonally-varying sea surface temperature (SST), a general circulation model experiment has been run in which this variation has been removed for a January climate simulation. This results in an ...

ABSTRACT Rapid sea ice retreat and increases in temperature have characterised the Arctic basin in the last few decades. A number of studies have suggested that these changes have had a direct impact on extremes of weather and climate in the midlatitudes, while others have submitted that the evidence for this may not be robust. Sato et al (2014 Environ. Res. Lett. 9 084009) cast considerable light on this divergence of perspectives by revealing that apparent links between Barents Sea ice coverage and cold Eurasian winters form just a sector of a teleconnection pattern which originates remotely in the North Atlantic Gulf Stream region.

ABSTRACT An objective climatology of anticyclones over the greater Mediterranean region is presented based on the Interim ECMWF Re-Analysis (ERA-Interim) for a 34-yr period (1979-2012) and the Melbourne University automatic identification and tracking algorithm. The scheme's robustness and reliability for the transient extratropical propagation of anticyclones, with the appropriate choices of parameter settings, has been established and the results obtained here present new research perspectives on anticyclonic activity affecting the Mediterranean. Properties of Mediterranean anticyclones, such as frequency, generation and dissipation, movement, scale, and depth are investigated. The highest frequency of anticyclones is found over continental areas, while the highest maritime frequency occurs over closed basins exhibiting also maxima of anticyclogenesis. There is a significant seasonality in system density and anticyclogenesis maxima, this being associated with the seasonal variations of the larger-scale atmospheric circulation that affect the greater Mediterranean region.

Information about past tropical climate variability is recorded in oxygen isotope ratios in coral and foraminiferal carbonate as well as tropical ice cores. The interpretation of isotopic climate records requires assumptions about the application of present day isotope-climate ...

Background The study of the cyclone/anticyclone frequencies has a long history. Study of these features has always been considered a fundamental element of mid-latitude meteorology. Proper simulation of the location and intensity of these features play a critical ...

... stress and temperature temporal variability, and their changes with distance from the coast Andrew B. Watkins, Ian Simmonds School of ... Diflering sea-iec (Ackley, 1991; Glocrsen and others, 1992; Parkinson, 1994) and atmospheric (Jones and Simmonds, 1993) conditions with ...

... WF BUDD, IAN SIMMONDS AND XINGREN Wu Department of Meteorology, University of Melbourne, Parkville, 3052, Australia ... other simplifications, such as the use of prescribed atmospheric forcings (eg Parkinson and Washington, 1876; Hibler and Ackley, 1983; Parkinson ...

... Buckley, BW, and LM Leslie, 2004: Preliminary climatology and improved modelling of south Indian Ocean and Southern Ocean mid-latitude cyclones. Int. ... Rev., 128, 2544-2559 Part 2. Grell, GA, J. Dudhia and DR Stauffer, 1995: A Description of the Fifth-Generation Penn State ...