scholarly journals Comment on “Southern hemisphere temperature trends: A possible greenhouse effect?”

1988 ◽  
Vol 15 (8) ◽  
pp. 843-844 ◽  
Author(s):  
Keith P. Shine
Keyword(s):  
Southern Hemisphere ◽  
Greenhouse Effect ◽  
Temperature Trends ◽  
Hemisphere Temperature

scholarly journals Midlatitude Southern Hemisphere Temperature Change at the End of the Eocene Greenhouse Shortly Before Dawn of the Oligocene Icehouse

2019 ◽  
Vol 34 (12) ◽  
pp. 1995-2004
Author(s):  
A. M. Haiblen ◽  
B. N. Opdyke ◽  
A. P. Roberts ◽  
D. Heslop ◽  
P. A. Wilson
Keyword(s):  
Temperature Change ◽  
Southern Hemisphere ◽  
Hemisphere Temperature

A 1500-year record of temperature and glacial response inferred from varved Iceberg Lake, southcentral Alaska

2006 ◽  
Vol 66 (1) ◽  
pp. 12-24 ◽  
Author(s):  
Michael G. Loso ◽  
Robert S. Anderson ◽  
Suzanne P. Anderson ◽  
Paula J. Reimer
Keyword(s):  
Sediment Transport ◽  
20Th Century ◽  
Tree Ring ◽  
Ring Width ◽  
Warm Season ◽  
Tree Ring Width ◽  
Varve Thickness ◽  
Temperature Trends ◽  
Hemisphere Temperature ◽  
Southcentral Alaska

AbstractWe present a varve thickness chronology from glacier-dammed Iceberg Lake in the southern Alaska icefields. Radiogenic evidence confirms that laminations are annual and record continuous sediment deposition from A.D. 442 to A.D. 1998. Varve thickness is positively correlated with Northern Hemisphere temperature trends, and more strongly with a local, ∼600 yr long tree ring width chronology. Varve thickness increases in warm summers because of higher melt, runoff, and sediment transport (as expected), but also because shrinkage of the glacier dam allows shoreline regression that concentrates sediment in the smaller lake. Varve thickness provides a sensitive record of relative changes in warm season temperatures. Relative to the entire record, temperatures implied by this chronology were lowest around A.D. 600, warm between A.D. 1000 and A.D. 1300, cooler between A.D. 1500 and A.D. 1850, and have increased dramatically since then. Combined with stratigraphic evidence that contemporary jökulhlaups (which began in 1999) are unprecedented since at least A.D. 442, this record suggests that 20th century warming is more intense, and accompanied by more extensive glacier retreat, than the Medieval Warm Period or any other time in the last 1500 yr.

Recent Stratospheric Climate Trends as Evidenced in Radiosonde Data: Global Structure and Tropospheric Linkages

2005 ◽  
Vol 18 (22) ◽  
pp. 4785-4795 ◽  
Author(s):  
David W. J. Thompson ◽  
Susan Solomon
Keyword(s):  
Radiative Transfer ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Global Structure ◽  
Current Understanding ◽  
Radiosonde Data ◽  
Climate Trends ◽  
The Past ◽  
Stratospheric Temperature ◽  
Temperature Trends

Abstract The global structure of recent stratospheric climate trends is examined in radiosonde data. In contrast to conclusions published in previous assessments of stratospheric temperature trends, it is demonstrated that in the annual mean the tropical stratosphere has cooled substantially over the past few decades. The cooling of the tropical stratosphere is apparent in both nighttime and adjusted radiosonde data, and seems to be robust to changes in radiosonde instrumentation. The meridional structure of the annual-mean stratospheric trends is not consistent with our current understanding of radiative transfer and constituent trends but is consistent with increased upwelling in the tropical stratosphere. The annual-mean cooling of the tropical stratosphere is juxtaposed against seasonally varying trends in the extratropical stratosphere dominated by the well-known springtime cooling at polar latitudes. The polar stratospheric trends are accompanied by similarly signed trends at tropospheric levels in the Southern Hemisphere but not in the Northern Hemisphere.

scholarly journals How much has the Sun influenced Northern Hemisphere temperature trends? An ongoing debate

2021 ◽  
Vol 21 (6) ◽  
pp. 131
Author(s):  
Ronan Connolly ◽  
Willie Soon ◽  
Michael Connolly ◽  
Sallie Baliunas ◽  
Johan Berglund ◽  
...  
Keyword(s):  
Northern Hemisphere ◽  
The Sun ◽  
Ongoing Debate ◽  
Northern Hemisphere Temperature ◽  
Temperature Trends ◽  
Hemisphere Temperature

Sixty Years of Widespread Warming in the Southern Middle and High Latitudes (1957–2016)

2019 ◽  
Vol 32 (20) ◽  
pp. 6875-6898 ◽  
Author(s):  
Megan E. Jones ◽  
David H. Bromwich ◽  
Julien P. Nicolas ◽  
Jorge Carrasco ◽  
Eva Plavcová ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Southern Hemisphere ◽  
Climate Models ◽  
Coupled Model ◽  
Southern Annular Mode ◽  
Cmip5 Models ◽  
High Latitudes ◽  
West Antarctica ◽  
Temporal Perspective ◽  
Temperature Trends

Abstract Temperature trends across Antarctica over the last few decades reveal strong and statistically significant warming in West Antarctica and the Antarctic Peninsula (AP) contrasting with no significant change overall in East Antarctica. However, recent studies have documented cooling in the AP since the late 1990s. This study aims to place temperature changes in the AP and West Antarctica into a larger spatial and temporal perspective by analyzing monthly station-based surface temperature observations since 1957 across the extratropical Southern Hemisphere, along with sea surface temperature (SST) data and mean sea level pressure reanalysis data. The results confirm statistically significant cooling in station observations and SST trends throughout the AP region since 1999. However, the full 60-yr period shows statistically significant, widespread warming across most of the Southern Hemisphere middle and high latitudes. Positive SST trends broadly reflect these warming trends, especially in the midlatitudes. After confirming the importance of the southern annular mode (SAM) on southern high-latitude climate variability, the influence is removed from the station temperature records, revealing statistically significant background warming across all of the extratropical Southern Hemisphere. Antarctic temperature trends in a suite of climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) are then investigated. Consistent with previous work the CMIP5 models warm Antarctica at the background temperature rate that is 2 times faster than that observed. However, removing the SAM influence from both CMIP5 and observed temperatures results in Antarctic trends that differ only modestly, perhaps due to natural multidecadal variability remaining in the observations.

Sign in / Sign up

Export Citation Format

Share Document