Sentences with phrase «surface albedo»
These runs are examined for evidence of accelerated climate change associated with the removal of sea ice, particularly due to increasing surface albedo feedback.
gfdl.noaa.gov
More surface warming than cloud - height warming is indicative of surface albedo change and / or fewer clouds and / or increase in solar «constant».
Furthermore, deforestation in the middle — high latitudes might have amplified Little Ice Age cooling by exposing more snow and increasing surface albedo (107, 110, 111).
You wouldn't by chance have a link handy explaining the importance of land use change for surface albedo as a climate forcing?
New techniques that evaluate surface albedo feedbacks have recently been developed.
A new result found independently by Winton (2006a) and Qu and Hall (2005) is that surface processes are the main source of divergence in climate simulations of surface albedo feedback, rather than simulated differences in cloud fields in cryospheric regions.
Based on evidence from Earth's history, we suggest here that the relevant form of climate sensitivity in the Anthropocene (e.g. from which to base future greenhouse gas (GHG) stabilization targets) is the Earth system sensitivity including fast feedbacks from changes in water vapour, natural aerosols, clouds and sea ice, slower surface albedo feedbacks from changes in continental ice sheets and vegetation, and climate — GHG feedbacks from changes in natural (land and ocean) carbon sinks.
Myhre et al. (2005) point out that the albedo of agricultural systems may be only slightly higher than that of forests and estimate that the impact since pre-agricultural times of land use conversion to agriculture on global radiative forcing has been only — 0.09 W m — 2, that is, about 5 % of the warming contributed by CO2 since pre-industrial times (see Chapter 2 for a more comprehensive review of recent estimates of land surface albedo change).
The three studies, using different methodologies to estimate the global surface albedo feedback associated with snow and sea ice changes, all suggest that this feedback is positive in all the models, and that its range is much smaller than that of cloud feedbacks.
Hansen and Sato examine the longer - term Earth System Sensitivity by adding in slow feedbacks one - by - one, starting with surface albedo.
«Our estimated LGM - Holocene forcings with 1σ uncertainties are 3 ± 0.3 W / m2 for GHGs (range 2.4 - 3.6 W / m2 for 95 % confidence) and 3 ± 0.7 W / m2 for surface albedo (range 1.6 - 4.4 W / m2 for 95 % confidence).»
Comparison of MODIS and MISR - derived surface albedo with in situ measurements in Greenland.
This estimate does not include the semi-direct effect or the BC impact on snow and ice surface albedo (see Sections 2.5.4 and 2.8.5.6)
Intercomparison Between in situ and AVHRR Polar Pathfinder - derived Surface Albedo over Greenland Remote Sensing of the Environment 75 (3): 360 - 374.
«Urbanization affects not just surface albedo,» says urban environment researcher Karen Seto of the Yale School of Forestry and Environmental Studies, who was not involved in any of the research.
Data from real glaciers are required both to parameterise a model, for which values from similar glaciers in other parts of the world may be used, e.g. glacier surface albedo (Cuffey and Paterson, 2010), and to define variables for the study glacier.
Evaluating land surface albedo estimation from Landsat MSS, TM, ETM +, and OLI data based on the unified direct estimation approach Dating: Dating, in geology, determining a chronology or calendar of events in the history of Earth, using to a large degree the evidence of organic
The measured transmittance (derived from the MFRSR measurements and the Langley VAP), liquid water path, and solar zenith angle and an assumed surface albedo are input to the algorithm.
«Areal - Averaged Spectral Surface Albedo in an Atlantic Coastal Area: Estimation from Ground - Based Transmission.»
We hypothesize that the global climate variations of the Cenozoic (figure 1) can be understood and analysed via slow temporal changes in Earth's energy balance, which is a function of solar irradiance, atmospheric composition (specifically long - lived GHGs) and planetary surface albedo.
These are the first order effects, where a second order effect is that cloud cover eclipses or reveals surface albedo, so a net albedo effect is important.
The climate change Δαs / ΔTs values are the reduction in springtime surface albedo averaged over Northern Hemisphere continents between the 20th and 22nd centuries divided by the increase in surface air temperature in the region over the same time period.
Borrowing a page from Daisy World, it strikes me that release of permafrost carbon might be slowed by boosting summertime Arctic surface albedo.