scholarly journals Cloud overlap effects on general circulation model climate simulations

1997 ◽  
Vol 102 (D10) ◽  
pp. 11039-11047 ◽  
Author(s):  
Xin-Zhong Liang ◽  
Wei-Chyung Wang
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
Climate Simulations

Holocene paleohydrology of central Alberta: testing the general-circulation-model climate simulations

1989 ◽  
Vol 26 (9) ◽  
pp. 1826-1833 ◽  
Author(s):  
Charles E. Schweger ◽  
Michael Hickman
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
Water Levels ◽  
Early Holocene ◽  
Lake Levels ◽  
Model Simulations ◽  
Climate Simulations ◽  
Indicator Genus ◽  
Warm Lakes

Paleoecological investigations of 28 lakes and bogs provide the basis for a Holocene paleohydrological record for central Alberta. Shallow basins, empty during the early Holocene, began flooding shortly after 8000 years ago; most filled from 6500 to 4500 years ago, and none filled later than 3000 years ago. Pollen of a hypersaline indicator genus, Ruppia, was found in cores of lakes where the plant does not presently grow, indicating lower lake levels, evaporation stress, and increased salinity from 8000 to 3000 years ago. Moore Lake (54°30′N, 100°30′W) may have dropped 15 m from 9200 to 5900 years ago, and Lofty Lake (54°44′N, 112°29′W) largely dried up between 8700 and 6300 years ago. Lower water levels are suggested for several lakes by shifts in fossil diatom populations from planktonic to benthic, particularly epipelic species including pioneering taxa. These shallow, warm lakes were highly productive and sedimentary pigment levels reached maximum values between about 9000 and 4000 years ago.The paleohydrological record indicates early Holocene aridity, with the onset and development of moister conditions between 8000 and 3000 years ago, by which time modern climatic and vegetation conditions had been established. This record fits the Holocene climate predicted by the general-circulation-model simulations based on orbital perturbations.

scholarly journals Enforcing conservation of axial angular momentum in the atmospheric general circulation model CAM6

2019 ◽  
Author(s):  
Thomas Toniazzo ◽  
Mats Bentsen ◽  
Cheryl Craig ◽  
Brian Eaton ◽  
James Edwards ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Numerical Simulations ◽  
Numerical Method ◽  
General Circulation Model ◽  
General Circulation ◽  
Atmospheric General Circulation Model ◽  
Circulation Model ◽  
Atmospheric General Circulation ◽  
Community Atmosphere Model ◽  
Climate Simulations

Abstract. We present a numerical method to enforce global conservation of atmospheric axial angular momentum (AM) in the Community Atmosphere Model (CAM). We discuss the results in a hierarchy of numerical simulations of the atmosphere of increasing complexity, and we demonstrate the importance of global AM conservation in climate simulations.

An eddy-permitting ocean-sea ice general circulation model (E3SMv0-HiLAT03): Description and evaluation

2019 ◽  
Author(s):  
Jiaxu Zhang ◽  
Wilbert Weijer ◽  
Mathew Einar Maltrud ◽  
Carmela Veneziani ◽  
Nicole Jeffery ◽  
...  
Keyword(s):  
Sea Ice ◽  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model

Calculating the Natural Atmospheric Radiation Using the General Circulation Model of the Earth’s Lower and Middle Atmosphere

2020 ◽  
Vol 12 (5) ◽  
pp. 803-815
Author(s):  
B. N. Chetverushkin ◽  
I. V. Mingalev ◽  
E. A. Fedotova ◽  
K. G. Orlov ◽  
V. M. Chechetkin ◽  
...  
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Middle Atmosphere ◽  
Circulation Model ◽  
Atmospheric Radiation
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