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You searched for: Publication Year 2011 Remove constraint Publication Year: 2011 Source 2011 v.331 no.6017 Remove constraint Source: 2011 v.331 no.6017 Subject climate Remove constraint Subject: climate
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1. Seasonal Erosion and Restoration of Mars' Northern Polar Dunes

Author:
Hansen, C.J.; Bourke, M.; Bridges, N.T.; Byrne, S.; Colon, C.; Diniega, S.; Dundas, C.; Herkenhoff, K.; McEwen, A.; Mellon, M.; Portyankina, G.; Thomas, N.
Source:
Science 2011 v.331 no.6017 pp. 575-578
ISSN:
0036-8075
Subject:
carbon dioxide; climate; dunes; environmental factors; image analysis; ravines; sand; spring; sublimation; wind
Abstract:
... Despite radically different environmental conditions, terrestrial and martian dunes bear a strong resemblance, indicating that the basic processes of saltation and grainfall (sand avalanching down the dune slipface) operate on both worlds. Here, we show that martian dunes are subject to an additional modification process not found on Earth: springtime sublimation of Mars' CO₂ seasonal polar caps. ...
DOI:
10.1126/science.1197636

2. 2500 Years of European Climate Variability and Human Susceptibility

Author:
Büntgen, Ulf; Tegel, Willy; Nicolussi, Kurt; McCormick, Michael; Frank, David; Trouet, Valerie; Kaplan, Jed O.; Herzig, Franz; Heussner, Karl-Uwe; Wanner, Heinz; Luterbacher, Jürg; Esper, Jan
Source:
Science 2011 v.331 no.6017 pp. 578-582
ISSN:
0036-8075
Subject:
anthropogenic activities; climate; climate change; humans; politics; risk; summer; temperature
Abstract:
... Climate variations influenced the agricultural productivity, health risk, and conflict level of preindustrial societies. Discrimination between environmental and anthropogenic impacts on past civilizations, however, remains difficult because of the paucity of high-resolution paleoclimatic evidence. We present tree ring-based reconstructions of central European summer precipitation and temperature ...
DOI:
10.1126/science.1197175