Sentences with phrase «ice concentration record»
The sea ice concentration record from the Cryosphere Today site shows an unbroken chain of observations from 1979 to 2008.
https://dotearth.blogs.nytimes.com/ Not exact matches
«While concentrations measured in Antarctic ice cores are very low, the records show that atmospheric concentrations and deposition rates increased approximately six-fold in the late 1880s, coincident with the start of mining at Broken Hill in southern Australia and smelting at nearby Port Pirie.»
The research team — which utilized 34,000 data records from 2010 and 2011 — concluded that melting sea ice is diluting seawater and reducing the concentrations of the carbonate minerals critical as building blocks for the shells of marine life.
Ice - core Records of Atmospheric Halogen Concentrations over Western Antarctica - Past and Present.
NASA's Earth Observatory reports that there was a record low Arctic sea ice concentration in June 2005.
However, atmospheric CO2 content plays an important internal feedback role.Orbital - scale variability in CO2 concentrations over the last several hundred thousand years covaries (Figure 5.3) with variability in proxy records including reconstructions of global ice volume (Lisiecki and Raymo, 2005), climatic conditions in central Asia (Prokopenko et al., 2006), tropical (Herbert et al., 2010) and Southern Ocean SST (Pahnke et al., 2003; Lang and Wolff, 2011), Antarctic temperature (Parrenin et al., 2013), deep - ocean temperature (Elder eld et al., 2010), biogeochemical conditions in the Northet al., 2008).
They used methane concentrations to synchronize the ice core records from Greenland and Antarctica.
«the European Project for Ice Coring in Antarctica (EPICA) established a precise link between climate records from Greenland and Antarctica using data on global changes in methane concentrations derived from trapped air bubbles in the ice.&raqIce Coring in Antarctica (EPICA) established a precise link between climate records from Greenland and Antarctica using data on global changes in methane concentrations derived from trapped air bubbles in the ice.&raqice.»
The so - called «Keeling Curve» of CO2 concentrations since 1958 looks like a spike against the 800,000 - year ice - core record of this atmospheric trace gas.
Nevertheless, the record - low sea ice concentration is consistent with a shrinking ice - cap due to a warming.
Current concentrations of atmospheric carbon dioxide and methane far exceed pre-industrial values found in polar ice core records of atmospheric composition dating back 650,000 years.
Note that part of the uncertainy in all this is the time uncertainty — from the ice core records, we can pick a rather precise time and look at a rather precise number for greenhouse gas concentrations, but pinning down the magnitude albedo change at exactly the same time (since albedo is not globally uniform, obviously) is impossible.
The maximum CO2 concentration levels from any ice core record is 298.7 ppm.
«High resolution records from Antarctic ice cores show that carbon dioxide concentrations increased... 600 ± 400 years after the warming...» — Dr. Hubertus Fischer et al., Science, 1999
The EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF) team is pleased to announce the release of OSI - 450, a new full reprocessing of its Sea Ice Concentration (SIC) Climate Data Record (CDR).
Global sea ice concentration climate data records 1978 - 2015 (v1.2, 2015), [Online].
Apparently according to McKay et al 1991 concentrations as low as 250ppm for extended periods of time (as depicted in the ice - core) would have led to the extinction of certain C4 plant species and this has not been recorded by paleo - botanists.
2012's sea ice area and extent were already trending low this year, but damage done to the thin and low concentration of ice by this storm almost ensures that 2012 will eclipse 2007 in all categories as the lowest sea ice on record by the time the September low is set.
Data is from the National Snow and Ice Data Center, monthly sea ice concentration derived from the passive microwave record (NASA Team algorithIce Data Center, monthly sea ice concentration derived from the passive microwave record (NASA Team algorithice concentration derived from the passive microwave record (NASA Team algorithm).
Arbetter et al. (North American Ice Service / National Ice Center); 4.9 Million Square Kilometers; Statistical / Heuristic Despite the reasonably large current extent (14.665 million km2) and compact concentration (12.461 million km2) in late April, the projected extent for mid-September is another near - record low (4.852 million km2).
Based on proxy records from ice, terrestrial and marine archives, the LIG is characterized by an atmospheric CO2 concentration of about 290 ppm, i.e., similar to the pre-industrial (PI) value13, mean air temperatures in Northeast Siberia that were about 9 °C higher than today14, air temperatures above the Greenland NEEM ice core site of about 8 ± 4 °C above the mean of the past millennium15, North Atlantic sea - surface temperatures of about 2 °C higher than the modern (PI) temperatures12, 16, and a global sea level 5 — 9 m above the present sea level17.
These very low sea ice concentration values, however, are not supported by our proxy records (cf., Figs. 3 and 7), suggesting that the Greenland Ice Sheet has probably not strongly deviated from its present higice concentration values, however, are not supported by our proxy records (cf., Figs. 3 and 7), suggesting that the Greenland Ice Sheet has probably not strongly deviated from its present higIce Sheet has probably not strongly deviated from its present hight.
For the LIG - 120 interval, we record an apparent mismatch between the LIG - 120 simulation (suggesting sea ice conditions similar to those of the PI conditions)(Figs. 4 and 8) and the proxy - based sea ice record (suggesting minimum sea ice concentrations similar to the early - mid-LIG (Fig. 7a).
In order to test and approve climate models for simulation and prediction of Arctic climate and sea ice cover8, 20,21,22,23,24,25,26,27,28, however, precise (semi-quantitative) proxy records about past sea ice concentrations are needed.
All of this will be over by 2015, when the records of 2010 and 1998 will have been obliterated by increased solar activity, ENSO and decreased albedo as we go into virtually ice free arctic summers, oh and increased GHG concentrations of course.
The mean ice concentration anomaly for June 2013 is 0.9 x 106 square kilometers greater than June 2012, however Arctic sea ice thicknesses and volumes continue to remain the lowest on record.
The current rate of CO2 rise in atmospheric concentrations is unprecedented with respect to the highest resolution ice core records which cover the last 22,000 years.
Sea ice concentration reached a new record low in mid-Sept 2012 based on NSIDC data.
no. 5408, pp. 1712 — 1714 (12 March 1999) «High - resolution records from Antarctic ice cores show that carbon dioxide concentrations increased by 80 to 100 parts per million by volume 600 ± 400 years after the warming of the last three deglaciations.»
Walt Meier Research Scientist, Cryospheric Sciences Lab, NASA Goddard Space Flight Center Specialties: Sea ice remote sensing; changes in sea ice concentration, extent, motion, thickness and age; development of sea ice climate data records; interaction of sea ice and climate
NOAA / NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration, Boulder, Colorado USA: National Snow and Ice Data Center.
PI, Sea Ice Concentration Climate Data Record Sustainment, Enhancement, and Production of Value - Added Products through the Sea Ice Index (NOAA)
Then, in another study of the 420,000 - year Vostok ice - core record, Mudelsee (2001) concluded that variations in atmospheric CO2 concentration lagged variations in air temperature by 1,300 to 5,000 years. . .»
NOAA@NSIDC is pleased to announce the release of Version 3 Revision 1 of the NOAA / NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration data product.
Methane clathrates are also present in deep Antarctic ice cores, and record a history of atmospheric methane concentrations, dating to 800,000 years ago.
It makes for substantial changes in atmospheric concentration that don't seem captured by the ice cores record.
The Statement also highlighted that long - term indicators of climate change such as increasing carbon dioxide concentrations, sea level rise and ocean acidification continue «unabated», with Arctic sea ice coverage remaining below average and the previously stable Antarctic sea ice extent at or near a record low.
First, he argues that since ice core records show that temperature generally started changing before CO2 concentrations by several hundred years, CO2 can't be a major cause of warming.
With these earlier data records, the ice concentrations would not be as reliable as the total ice extent, which is why most folks only show the extent.
In 2008, research on Antarctic Vostok and EPICA Dome C ice cores revealed that methane clathrates were also present in deep Antarctic ice cores and record a history of atmospheric methane concentrations, dating to 800,000 years ago.
CO2 Concentrations: record of global CO2 concentration for the last 1000 years, derived from measurements of CO2 concentration in air bubbles in the layered ice cores drilled in Antarctica (blue line) and from atmospheric measurements since 1957.
A synthetic aperture radar or equivalent capability is also needed in the production of the sea - ice climate data record for validation of sea ice concentration and edge.
The passive microwave satellite record of sea ice concentration and extent extends from 1979 to the present.
With MIS delayed until NPOESS C2, there is a need to continue the long (28 - year) climate data record of sea ice extent and concentration collected by passive microwave radiometers; continued scatterometer and altimeter measurements are also required.
The discovery in ice core records that atmospheric concentrations of two potent greenhouse gases, carbon dioxide and methane, have decreased during past glacial periods and peaked during interglacials indicates important feedback processes in the Earth system.