|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
The influence of the Amundsen Sea Low on the climate of West Antarctica and its representation in coupled climate model simulations
If you have a question about this talk, please contact Dr Scott Hosking.
If external to BAS, please email the organiser in advance to gain access to the building
In contrast to earlier studies, we describe the climatological deep low-pressure system that exists over the South Pacific sector of the Southern Ocean, referred to as the Amundsen Seas Low (ASL), in terms of its relative (rather than actual) central pressure by removing the background area-averaged mean sea level pressure (MSLP). In doing so, we remove much of the influence of large-scale variability across the ASL sector region (e.g., due to the Southern Annular Mode), allowing a clearer understanding of ASL variability and its effect on the regional climate of West Antarctica. Using ERA -Interim reanalysis fields the annual cycle of the relative central pressure of the ASL for the period 1979 to 2011 shows a minimum (maximum) during winter (summer), differing considerably from the earlier studies based on actual central pressure which suggests a semi-annual oscillation. The annual cycle of the longitudinal position of the ASL is insensitive to the background pressure, and shows it shifting westwards from 250° E to 220° E between summer and winter, in agreement with earlier studies. We demonstrate that ASL variability, and in particular its longitudinal position, plays an important role in controlling the surface climate of West Antarctica and the surrounding ocean by quantifying its influence on key meteorological parameters. Examination of the ASL annual cycle in seventeen CMIP5 climate models run with historical forcing showed that the majority of them have definite biases, especially in terms of longitudinal position, and a correspondingly poor representation of West Antarctic climate.
This talk is part of the British Antarctic Survey series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsSpring School 2010 - 'Axon-Glia Biology in Health and Disease' CUSPE Institute of Theoretical Geophysics Informal Lunchtime Seminars (DAMTP)
Other talksExplorations in computing motion and their implications for motion processing in monkey and man. Ten things you always wanted to know about Hans Sloane, founder of the British Museum... but were afraid to ask Postgraduate Diploma in Entrepreneurship webinar Drop splashing at smooth dry surfaces 'Poetry and memory: investigating the value of the memorised poem' Values in science and classifying the chemical elements