Sentences with phrase «analysis ice concentrations»

Not exact matches

These measurements, supplemented by analyses of air bubbles trapped in ice core samples, show unequivocally that atmospheric CO2 has increased from a pre-industrial level of 277 ppm in 1750 to present day concentrations that are approaching 390 ppm.

This hindcast uses two time - varying inputs: 10 - meter wind vectors from the atmospheric model NAVGEM (Navy Global Environmental Model, Hogan et al. 2014) run at the Fleet Numerical Meteorology and Oceanography Center (FNMOC), and analyses of ice concentrations (also produced at FNMOC) from passive microwave radiometer data (SSM / I).

For the latter, the analysis of the air entrapped in the ice is the only direct way to determine their concentrations for times before precise routine atmospheric measurements were done, that is, before 1958.

Two papers report analyses of this deep ice, including the lowest carbon dioxide concentration so far measured in an ice core.

Prediction of September 2010 sea ice concentration in the Canadian Arctic Archipelago from a statistical model (canonical correlation analysis).

Using a statistical model based on canonical correlation analysis with fall sea surface temperature anomalies in the North Atlantic as the main predictor, Tivy shows below - normal ice concentrations throughout most of the region (Figure 12), which suggests an earlier - than - normal opening of the shipping season.

---- Doddridge and Marshall, 2017 http://onlinelibrary.wiley.com/doi/10.1002/2017GL074319/abstract Through analysis of remotely - sensed sea surface temperature (SST) and sea ice concentration data we investigate the impact of winds related to the Southern Annular Mode (SAM) on sea ice extent around Antarctica.

Petty (NASA - GSFC / UMD), 4.12 (± 0.30), Statistical Based on an analysis of June sea ice concentration data provided by the NSIDC (NASA Team), I forecast a 2016 September Arctic sea ice extent of 4.12 + / - 0.30 million km2.

Wenk Physics Institute, University of Bern, CH — 3012 Bern, Sidlerstrasse 5, Switzerland Studies on air trapped in old polar ice1, 2 have shown that during the last ice age, the atmospheric carbon dioxide concentration was probably significantly lower than during the Holocene — about 200 p.p.m. rather than 270 p.p.m.. Also, Stauffer et al. 3 recently showed by detailed analyses of Greenland ice cores, that during the ice age, between about 30,000 and 40,000 yr BP, the atmospheric CO2 level probably varied between 200 and 260 p.p.m..

Marine Modeling and Analysis Branch of the Environmental Modeling Center: http://polar.ncep.noaa.gov/seaice/support/ssmi.advice.shtml Advice on Interpreting the MMAB Ice concentrations «Things other than ice can give an ice signatuIce concentrations «Things other than ice can give an ice signatuice can give an ice signatuice signature.

The statistical manipulation of raw measurement data of CO2 concentration in air from both within polar ice and atop a volcano in the middle of the pacific requires no less scrutiny by independent expert statisticians than the temperature analyses warranted.

Although several different algorithms have been used to derive sea ice concentrations from the satellite measurements, our analyses based on the Hurrell et al. (2008) data are consistent with previous studies.

Whether you or I am right about the ice core data does not affect Willis» analysis in any way: it is only relevant to the cause of recent rise in atmospheric CO2 concentration.

The black line is a simulated mean sea ice concentration from the CanESM2 large ensemble, a group of models developed at the Canadian Center for Climate Modelling and Analysis.

For the «2013 as observed» experiment, the atmospheric model uses observed sea surface temperature data from December 2012 to November 2013 from the Operational Sea Surface Temperature and Sea Ice Analysis (OSTIA) dataset (Stark et al. 2007; Donlon et al. 2012) and present day atmospheric gas concentrations to simulate weather events that are possible given the observed climate conditions.

The paper, «Reconstruction of past atmospheric CO2 concentrations by ice core analysis», acknowledges that, due to impurities, liquid water can exist as low as -50 deg C. Diffusion of CO2 into this water, due to its far higher solubility than nitrogen and oxygen, will partially deplete the CO2 from trapped air bubbles.

More than 20 years ago, analyses of greenhouse gas concentrations in ice cores showed that downward trends in CO2 and CH4 that had begun near 10,000 years ago subsequently reversed direction and rose steadily during the last several thousand years.