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Ruth, Urs; Steffensen, Jørgen Peder; Bigler, Matthias (2003): Particle concentration and size distribution in the NGRIP ice core. doi:10.1594/PANGAEA.107444,
Supplement to: Ruth, Urs; Wagenbach, Dietmar; Steffensen, Jørgen Peder; Bigler, Matthias (2003): Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period. Journal of Geophysical Research-Atmospheres, 108(D3), 4098, doi:10.1029/2002JD002376

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A novel laser microparticle detector used in conjunction with continuous sample melting has provided a more than 1500 m long record of particle concentration and size distribution of the NGRIP ice core, covering continuously the period approximately from 9.5-100 kyr before present; measurements were at 1.65 m depth resolution, corresponding to approximately 35-200 yr. Particle concentration increased by a factor of 100 in the Last Glacial Maximum (LGM) compared to the Preboreal, and sharp variations of concentration occurred synchronously with rapid changes in the delta18O temperature proxy. The lognormal mode µ of the volume distribution shows clear systematic variations with smaller modes during warmer climates and coarser modes during colder periods. We find µ ~ 1.7 µm diameter during LGM and µ ~ 1.3 µm during the Preboreal. On timescales below several 100 years µ and the particle concentration exhibit a certain degree of independence present especially during warm periods, when µ generally is more variable. Using highly simplifying considerations for atmospheric transport and deposition of particles we infer that (1) the observed changes of µ in the ice largely reflect changes in the size of airborne particles above the ice sheet and (2) changes of µ are indicative of changes in long range atmospheric transport time. From the observed size changes we estimate shorter transit times by roughly 25% during LGM compared to the Preboreal. The associated particle concentration increase from more efficient long range transport is estimated to less than one order of magnitude.
Related to:
Ruth, Urs (2002): Concentration and size distribution of microparticles in the NGRIP Ice Core (Central Greenland) during the Last Glacial period (Konzentration und Größenverteilung von Mikropartikeln im NGRIP Eiskern (Zentralgrönland) während des letzten Glazials). Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 428, 146 pp, doi:10.2312/BzPM_0428_2002
Latitude: 75.001000 * Longitude: -42.300000
Date/Time Start: 1996-07-01T00:00:00 * Date/Time End: 1996-07-01T00:00:00
Minimum DEPTH, ice/snow: 1405.25 m * Maximum DEPTH, ice/snow: 2929.57 m
NGRIP * Latitude: 75.001000 * Longitude: -42.300000 * Date/Time: 1996-07-01T00:00:00 * Elevation: 2925.0 m * Campaign: NGRIP * Basis: Sampling/drilling ice * Device: Ice drill (ICEDRILL)
The provisional depth scale was constructed by matching all D/O-transitions to the GRIP SS09 time scale and using a linear interpolation in between.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, ice/snowDepth ice/snowmGeocode
2AGEAgeka BPGeocode
3Depth, top/minDepth topm
4Depth, bottom/maxDepth botm
5Age, minimum/youngAge minkaRuth, Ursprovisional time scale (matching to GRIP) top -kyrs before 1950
6Age, maximum/oldAge maxkaRuth, Ursprovisional time scale (matching to GRIP) bottom - kyrs before 1950
7Particle concentrationPart conc#/mlRuth, Ursparticles >1 µm as measured
8Mass concentrationMµg/kgRuth, UrsCalculatedmeasured particle vol. for d>mu, parameterized distrib. for d<mu, density 2.6
9Mode, grain sizeModeµmRuth, Urslognormal mode of volume distribution resulting from a fit
10Standard deviationStd dev±Ruth, Ursstd dev of mode
11Standard deviationStd dev±Ruth, Ursof volume distribution, resulting from a fit
12Uncertainty of fit parameterV sigma std devRuth, Ursdiscrepancy of several fit-atempts based on diff. size ranges of distribution
13Sample commentSamp com
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