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(Article of periodic en Anglais - 2013)

Document title

Expansion of the northern hemisphere subtropical high pressure belt : trends and linkages to precipitation and drought

Authors(s) and Affiliation(s)

SVOMA B.M. (1) ; KRAHENBUHL D.S. (2) ; BUSH C.E. (2) ; MALLOY J.W. (2) ; WHITE J.R. (2) ; WAGNER M.A. (2) ; PACE M.B. (2) ; DEBIASSE K. (2) ; SELOVER N.J. (2) ; BALLING R.C. (2) ; CERVENY R.S. (2) ;
(1) Dept. of Soil, Environmental, and Atmospheric Sciences, Univ. Missouri, Columbia, ETATS-UNIS
(2) School of Geographical Sciences and Urban Planning, Arizona State Univ., Tempe, ETATS-UNIS

Abstract

The AA. establish that the annual areal size of the northern hemisphere subtropical high pressure belt (SHPB), as defined by seven 500-hPa height isohypses, shares over 70% of the variability with global annual near-surface air temperature since 1948. A long-term historical run of a coupled global climate model shows rapidly increasing SHPB annual sizes, since the mid-1970s. Since the SHPB’s descending air produces increased aridity, SHPB expansion may transition humid regions to more arid lands. To examine this aspect, first, variations in recorded precipitation using a gridded database for the region experiencing expansion of the SHPB show a decrease in precipitation over the last 60 years. Second, variations in a 0.5° spatial resolution monthly drought index, the Standardized Precipitation Evapotranspiration Index, are highly correlated with annual variations in the area enclosed by the 500-hPa height isohypses. These results suggest further northward expansion of the northern hemisphere subtropical dry zones with continued global climate change

Source

Article of periodic

published at : Physical geography / ISSN 0272-3646

Editor : Taylor & Francis, Abingdon - ROYAUME-UNI (1980)

Millesime : 2013, vol. 34, no3 [pp. 174-187]

Bibliographic references : 2 p.

Collation : 5 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 20106

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1080/02723646.2013.820657

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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