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Howard J. Diamond
,
Neil Plummer
, and
Kevin Walsh
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Jinyoung Rhee
,
Wenju Cai
,
Neil Plummer
,
Mannava Sivakumar
,
Nina Horstmann
,
Bin Wang
, and
Dewi Kirono
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Thomas R. Karl
,
Philip D. Jones
,
Richard W. Knight
,
George Kukla
,
Neil Plummer
,
Vyacheslav Razuvayev
,
Kevin P. Gallo
,
Janette Lindseay
,
Robert J. Charlson
, and
Thomas C. Peterson

Monthly mean maximum and minimum temperatures for over 50% (10%) of the Northern (Southern) Hemisphere landmass, accounting for 37% of the global landmass, indicate that the rise of the minimum temperature has occurred at a rate three times that of the maximum temperature during the period 1951–90 (0.84°C versus 0.28°C). The decrease of the diurnal temperature range is approximately equal to the increase of mean temperature. The asymmetry is detectable in all seasons and in most of the regions studied.

The decrease in the daily temperature range is partially related to increases in cloud cover. Furthermore, a large number of atmospheric and surface boundary conditions are shown to differentially affect the maximum and minimum temperature. Linkages of the observed changes in the diurnal temperature range to large-scale climate forcings, such as anthropogenic increases in sulfate aerosols, greenhouse gases, or biomass burning (smoke), remain tentative. Nonetheless, the observed decrease of the diurnal temperature range is clearly important, both scientifically and practically.

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Cher M. Page
,
Neville Nicholls
,
Neil Plummer
,
Blair Trewin
,
Mike Manton
,
Lisa Alexander
,
Lynda E. Chambers
,
Youngeun Choi
,
Dean A. Collins
,
Ashmita Gosai
,
Paul Della-Marta
,
Malcolm R. Haylock
,
Kasis Inape
,
Victoire Laurent
,
Luc Maitrepierre
,
Erwin E.P. Makmur
,
Hiroshi Nakamigawa
,
Nongnat Ouprasitwong
,
Simon McGree
,
Janita Pahalad
,
M.J. Salinger
,
Lourdes Tibig
,
Trong D. Tran
,
Kaliapan Vediapan
, and
Panmao Zhai
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