Joel R Norris

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[1] We examine multidecadal changes in surface downward shortwave (SW) radiation flux, total cloud cover, SW cloud effect, and related parameters over Europe during 1965– 2004 using monthly gridded data from the Global Energy Balance Archive (GEBA), synoptic cloud reports, and the International Satellite Cloud Climatology Project (ISCCP). One key issue is(More)
Observational analyses have shown the width of the tropical belt increasing in recent decades as the world has warmed. This expansion is important because it is associated with shifts in large-scale atmospheric circulation and major climate zones. Although recent studies have attributed tropical expansion in the Southern Hemisphere to ozone depletion, the(More)
institutional repository or funder's repository and make it publicly available immediately. Abstract This paper highlights how the emerging record of satellite observations from the Earth Observation System (EOS) and A-Train constellation are advancing our ability to more completely document and understand the underlying processes associated with variations(More)
Feedbacks involving low-level clouds remain a primary cause of uncertainty in global climate model projections. This issue was addressed by examining changes in low-level clouds over the Northeast Pacific in observations and climate models. Decadal fluctuations were identified in multiple, independent cloud data sets, and changes in cloud cover appeared to(More)
The summer-to-summer variability of the areal extent of marine stratiform cloudiness (MSC; stratus, strato-cumulus, and fog) over the North Pacific is examined for the period of record 1952–92 using a dataset based on surface observations. Variability is largest in two regions: the central and western Pacific along 35ЊN coincident with a strong meridional(More)
[1] Global climate models typically do not correctly simulate cloudiness associated with midlatitude synoptic systems because coarse grid spacing prevents them from resolving dynamics occurring at smaller scales and there exist no adequate parameterizations for the effects of these subgrid-scale dynamics. Comparison of modeled and observed cloud properties(More)
| O ceanic ecosystems influence climate on many time and space scales. But this influence is not well understood. It is clear that interdecadal 1 physical climate variations occur in the Pacific sector. Interdecadal sea surface temperature (SST) anoma-Oceanic ecosystems altered by interdecadal climate variability may provide a feedback to the physical(More)
The response of clouds and their radiative effects to global warming represents a long-standing and considerable area of uncertainty in our understanding of climate change. At present, it is not known whether changes in cloudiness will exacerbate, mitigate, or have little effect on the increasing global surface temperature caused by anthropo-genic(More)